Mercurial > hg > CbC > CbC_gcc
annotate gcc/cselib.c @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | f6334be47118 |
| children | 84e7813d76e9 |
| rev | line source |
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| 0 | 1 /* Common subexpression elimination library for GNU compiler. |
| 111 | 2 Copyright (C) 1987-2017 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify it under | |
| 7 the terms of the GNU General Public License as published by the Free | |
| 8 Software Foundation; either version 3, or (at your option) any later | |
| 9 version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 #include "config.h" | |
| 21 #include "system.h" | |
| 22 #include "coretypes.h" | |
| 111 | 23 #include "backend.h" |
| 24 #include "target.h" | |
| 0 | 25 #include "rtl.h" |
| 111 | 26 #include "tree.h" |
| 27 #include "df.h" | |
| 28 #include "memmodel.h" | |
| 0 | 29 #include "tm_p.h" |
| 30 #include "regs.h" | |
| 31 #include "emit-rtl.h" | |
| 111 | 32 #include "dumpfile.h" |
| 0 | 33 #include "cselib.h" |
| 34 #include "params.h" | |
| 35 | |
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36 /* A list of cselib_val structures. */ |
| 111 | 37 struct elt_list |
| 38 { | |
| 39 struct elt_list *next; | |
| 40 cselib_val *elt; | |
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41 }; |
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42 |
| 0 | 43 static bool cselib_record_memory; |
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44 static bool cselib_preserve_constants; |
| 111 | 45 static bool cselib_any_perm_equivs; |
| 46 static inline void promote_debug_loc (struct elt_loc_list *l); | |
| 0 | 47 static struct elt_list *new_elt_list (struct elt_list *, cselib_val *); |
| 111 | 48 static void new_elt_loc_list (cselib_val *, rtx); |
| 0 | 49 static void unchain_one_value (cselib_val *); |
| 50 static void unchain_one_elt_list (struct elt_list **); | |
| 51 static void unchain_one_elt_loc_list (struct elt_loc_list **); | |
| 52 static void remove_useless_values (void); | |
| 111 | 53 static unsigned int cselib_hash_rtx (rtx, int, machine_mode); |
| 54 static cselib_val *new_cselib_val (unsigned int, machine_mode, rtx); | |
| 0 | 55 static void add_mem_for_addr (cselib_val *, cselib_val *, rtx); |
| 56 static cselib_val *cselib_lookup_mem (rtx, int); | |
| 111 | 57 static void cselib_invalidate_regno (unsigned int, machine_mode); |
| 0 | 58 static void cselib_invalidate_mem (rtx); |
| 59 static void cselib_record_set (rtx, cselib_val *, cselib_val *); | |
| 111 | 60 static void cselib_record_sets (rtx_insn *); |
| 0 | 61 |
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62 struct expand_value_data |
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63 { |
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64 bitmap regs_active; |
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65 cselib_expand_callback callback; |
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66 void *callback_arg; |
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67 bool dummy; |
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68 }; |
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69 |
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70 static rtx cselib_expand_value_rtx_1 (rtx, struct expand_value_data *, int); |
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71 |
| 0 | 72 /* There are three ways in which cselib can look up an rtx: |
| 73 - for a REG, the reg_values table (which is indexed by regno) is used | |
| 74 - for a MEM, we recursively look up its address and then follow the | |
| 75 addr_list of that value | |
| 76 - for everything else, we compute a hash value and go through the hash | |
| 77 table. Since different rtx's can still have the same hash value, | |
| 78 this involves walking the table entries for a given value and comparing | |
| 79 the locations of the entries with the rtx we are looking up. */ | |
| 80 | |
| 111 | 81 struct cselib_hasher : nofree_ptr_hash <cselib_val> |
| 82 { | |
| 83 struct key { | |
| 84 /* The rtx value and its mode (needed separately for constant | |
| 85 integers). */ | |
| 86 machine_mode mode; | |
| 87 rtx x; | |
| 88 /* The mode of the contaning MEM, if any, otherwise VOIDmode. */ | |
| 89 machine_mode memmode; | |
| 90 }; | |
| 91 typedef key *compare_type; | |
| 92 static inline hashval_t hash (const cselib_val *); | |
| 93 static inline bool equal (const cselib_val *, const key *); | |
| 94 }; | |
| 95 | |
| 96 /* The hash function for our hash table. The value is always computed with | |
| 97 cselib_hash_rtx when adding an element; this function just extracts the | |
| 98 hash value from a cselib_val structure. */ | |
| 99 | |
| 100 inline hashval_t | |
| 101 cselib_hasher::hash (const cselib_val *v) | |
| 102 { | |
| 103 return v->hash; | |
| 104 } | |
| 105 | |
| 106 /* The equality test for our hash table. The first argument V is a table | |
| 107 element (i.e. a cselib_val), while the second arg X is an rtx. We know | |
| 108 that all callers of htab_find_slot_with_hash will wrap CONST_INTs into a | |
| 109 CONST of an appropriate mode. */ | |
| 110 | |
| 111 inline bool | |
| 112 cselib_hasher::equal (const cselib_val *v, const key *x_arg) | |
| 113 { | |
| 114 struct elt_loc_list *l; | |
| 115 rtx x = x_arg->x; | |
| 116 machine_mode mode = x_arg->mode; | |
| 117 machine_mode memmode = x_arg->memmode; | |
| 118 | |
| 119 if (mode != GET_MODE (v->val_rtx)) | |
| 120 return false; | |
| 121 | |
| 122 if (GET_CODE (x) == VALUE) | |
| 123 return x == v->val_rtx; | |
| 124 | |
| 125 /* We don't guarantee that distinct rtx's have different hash values, | |
| 126 so we need to do a comparison. */ | |
| 127 for (l = v->locs; l; l = l->next) | |
| 128 if (rtx_equal_for_cselib_1 (l->loc, x, memmode, 0)) | |
| 129 { | |
| 130 promote_debug_loc (l); | |
| 131 return true; | |
| 132 } | |
| 133 | |
| 134 return false; | |
| 135 } | |
| 136 | |
| 0 | 137 /* A table that enables us to look up elts by their value. */ |
| 111 | 138 static hash_table<cselib_hasher> *cselib_hash_table; |
| 139 | |
| 140 /* A table to hold preserved values. */ | |
| 141 static hash_table<cselib_hasher> *cselib_preserved_hash_table; | |
| 0 | 142 |
| 143 /* This is a global so we don't have to pass this through every function. | |
| 144 It is used in new_elt_loc_list to set SETTING_INSN. */ | |
| 111 | 145 static rtx_insn *cselib_current_insn; |
| 0 | 146 |
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147 /* The unique id that the next create value will take. */ |
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148 static unsigned int next_uid; |
| 0 | 149 |
| 150 /* The number of registers we had when the varrays were last resized. */ | |
| 151 static unsigned int cselib_nregs; | |
| 152 | |
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153 /* Count values without known locations, or with only locations that |
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154 wouldn't have been known except for debug insns. Whenever this |
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155 grows too big, we remove these useless values from the table. |
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156 |
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157 Counting values with only debug values is a bit tricky. We don't |
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158 want to increment n_useless_values when we create a value for a |
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159 debug insn, for this would get n_useless_values out of sync, but we |
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160 want increment it if all locs in the list that were ever referenced |
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161 in nondebug insns are removed from the list. |
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162 |
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163 In the general case, once we do that, we'd have to stop accepting |
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164 nondebug expressions in the loc list, to avoid having two values |
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165 equivalent that, without debug insns, would have been made into |
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166 separate values. However, because debug insns never introduce |
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167 equivalences themselves (no assignments), the only means for |
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168 growing loc lists is through nondebug assignments. If the locs |
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169 also happen to be referenced in debug insns, it will work just fine. |
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170 |
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171 A consequence of this is that there's at most one debug-only loc in |
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172 each loc list. If we keep it in the first entry, testing whether |
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173 we have a debug-only loc list takes O(1). |
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174 |
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175 Furthermore, since any additional entry in a loc list containing a |
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176 debug loc would have to come from an assignment (nondebug) that |
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177 references both the initial debug loc and the newly-equivalent loc, |
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178 the initial debug loc would be promoted to a nondebug loc, and the |
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179 loc list would not contain debug locs any more. |
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180 |
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181 So the only case we have to be careful with in order to keep |
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182 n_useless_values in sync between debug and nondebug compilations is |
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183 to avoid incrementing n_useless_values when removing the single loc |
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184 from a value that turns out to not appear outside debug values. We |
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185 increment n_useless_debug_values instead, and leave such values |
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186 alone until, for other reasons, we garbage-collect useless |
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187 values. */ |
| 0 | 188 static int n_useless_values; |
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189 static int n_useless_debug_values; |
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190 |
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191 /* Count values whose locs have been taken exclusively from debug |
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192 insns for the entire life of the value. */ |
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193 static int n_debug_values; |
| 0 | 194 |
| 195 /* Number of useless values before we remove them from the hash table. */ | |
| 196 #define MAX_USELESS_VALUES 32 | |
| 197 | |
| 198 /* This table maps from register number to values. It does not | |
| 199 contain pointers to cselib_val structures, but rather elt_lists. | |
| 200 The purpose is to be able to refer to the same register in | |
| 201 different modes. The first element of the list defines the mode in | |
| 202 which the register was set; if the mode is unknown or the value is | |
| 203 no longer valid in that mode, ELT will be NULL for the first | |
| 204 element. */ | |
| 205 static struct elt_list **reg_values; | |
| 206 static unsigned int reg_values_size; | |
| 207 #define REG_VALUES(i) reg_values[i] | |
| 208 | |
| 209 /* The largest number of hard regs used by any entry added to the | |
| 210 REG_VALUES table. Cleared on each cselib_clear_table() invocation. */ | |
| 211 static unsigned int max_value_regs; | |
| 212 | |
| 213 /* Here the set of indices I with REG_VALUES(I) != 0 is saved. This is used | |
| 214 in cselib_clear_table() for fast emptying. */ | |
| 215 static unsigned int *used_regs; | |
| 216 static unsigned int n_used_regs; | |
| 217 | |
| 218 /* We pass this to cselib_invalidate_mem to invalidate all of | |
| 219 memory for a non-const call instruction. */ | |
| 220 static GTY(()) rtx callmem; | |
| 221 | |
| 222 /* Set by discard_useless_locs if it deleted the last location of any | |
| 223 value. */ | |
| 224 static int values_became_useless; | |
| 225 | |
| 226 /* Used as stop element of the containing_mem list so we can check | |
| 227 presence in the list by checking the next pointer. */ | |
| 228 static cselib_val dummy_val; | |
| 229 | |
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230 /* If non-NULL, value of the eliminated arg_pointer_rtx or frame_pointer_rtx |
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231 that is constant through the whole function and should never be |
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232 eliminated. */ |
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233 static cselib_val *cfa_base_preserved_val; |
| 111 | 234 static unsigned int cfa_base_preserved_regno = INVALID_REGNUM; |
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235 |
| 0 | 236 /* Used to list all values that contain memory reference. |
| 237 May or may not contain the useless values - the list is compacted | |
| 238 each time memory is invalidated. */ | |
| 239 static cselib_val *first_containing_mem = &dummy_val; | |
| 111 | 240 |
| 241 static object_allocator<elt_list> elt_list_pool ("elt_list"); | |
| 242 static object_allocator<elt_loc_list> elt_loc_list_pool ("elt_loc_list"); | |
| 243 static object_allocator<cselib_val> cselib_val_pool ("cselib_val_list"); | |
| 244 | |
| 245 static pool_allocator value_pool ("value", RTX_CODE_SIZE (VALUE)); | |
| 0 | 246 |
| 247 /* If nonnull, cselib will call this function before freeing useless | |
| 248 VALUEs. A VALUE is deemed useless if its "locs" field is null. */ | |
| 249 void (*cselib_discard_hook) (cselib_val *); | |
|
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250 |
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251 /* If nonnull, cselib will call this function before recording sets or |
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252 even clobbering outputs of INSN. All the recorded sets will be |
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253 represented in the array sets[n_sets]. new_val_min can be used to |
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254 tell whether values present in sets are introduced by this |
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255 instruction. */ |
| 111 | 256 void (*cselib_record_sets_hook) (rtx_insn *insn, struct cselib_set *sets, |
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257 int n_sets); |
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258 |
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259 #define PRESERVED_VALUE_P(RTX) \ |
| 111 | 260 (RTL_FLAG_CHECK1 ("PRESERVED_VALUE_P", (RTX), VALUE)->unchanging) |
| 261 | |
| 262 #define SP_BASED_VALUE_P(RTX) \ | |
| 263 (RTL_FLAG_CHECK1 ("SP_BASED_VALUE_P", (RTX), VALUE)->jump) | |
|
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264 |
| 0 | 265 |
| 266 | |
| 267 /* Allocate a struct elt_list and fill in its two elements with the | |
| 268 arguments. */ | |
| 269 | |
| 270 static inline struct elt_list * | |
| 271 new_elt_list (struct elt_list *next, cselib_val *elt) | |
| 272 { | |
| 111 | 273 elt_list *el = elt_list_pool.allocate (); |
| 0 | 274 el->next = next; |
| 275 el->elt = elt; | |
| 276 return el; | |
| 277 } | |
| 278 | |
| 111 | 279 /* Allocate a struct elt_loc_list with LOC and prepend it to VAL's loc |
| 280 list. */ | |
| 281 | |
| 282 static inline void | |
| 283 new_elt_loc_list (cselib_val *val, rtx loc) | |
| 0 | 284 { |
| 111 | 285 struct elt_loc_list *el, *next = val->locs; |
| 286 | |
| 287 gcc_checking_assert (!next || !next->setting_insn | |
| 288 || !DEBUG_INSN_P (next->setting_insn) | |
| 289 || cselib_current_insn == next->setting_insn); | |
|
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290 |
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291 /* If we're creating the first loc in a debug insn context, we've |
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292 just created a debug value. Count it. */ |
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293 if (!next && cselib_current_insn && DEBUG_INSN_P (cselib_current_insn)) |
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294 n_debug_values++; |
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295 |
| 111 | 296 val = canonical_cselib_val (val); |
| 297 next = val->locs; | |
| 298 | |
| 299 if (GET_CODE (loc) == VALUE) | |
| 300 { | |
| 301 loc = canonical_cselib_val (CSELIB_VAL_PTR (loc))->val_rtx; | |
| 302 | |
| 303 gcc_checking_assert (PRESERVED_VALUE_P (loc) | |
| 304 == PRESERVED_VALUE_P (val->val_rtx)); | |
| 305 | |
| 306 if (val->val_rtx == loc) | |
| 307 return; | |
| 308 else if (val->uid > CSELIB_VAL_PTR (loc)->uid) | |
| 309 { | |
| 310 /* Reverse the insertion. */ | |
| 311 new_elt_loc_list (CSELIB_VAL_PTR (loc), val->val_rtx); | |
| 312 return; | |
| 313 } | |
| 314 | |
| 315 gcc_checking_assert (val->uid < CSELIB_VAL_PTR (loc)->uid); | |
| 316 | |
| 317 if (CSELIB_VAL_PTR (loc)->locs) | |
| 318 { | |
| 319 /* Bring all locs from LOC to VAL. */ | |
| 320 for (el = CSELIB_VAL_PTR (loc)->locs; el->next; el = el->next) | |
| 321 { | |
| 322 /* Adjust values that have LOC as canonical so that VAL | |
| 323 becomes their canonical. */ | |
| 324 if (el->loc && GET_CODE (el->loc) == VALUE) | |
| 325 { | |
| 326 gcc_checking_assert (CSELIB_VAL_PTR (el->loc)->locs->loc | |
| 327 == loc); | |
| 328 CSELIB_VAL_PTR (el->loc)->locs->loc = val->val_rtx; | |
| 329 } | |
| 330 } | |
| 331 el->next = val->locs; | |
| 332 next = val->locs = CSELIB_VAL_PTR (loc)->locs; | |
| 333 } | |
| 334 | |
| 335 if (CSELIB_VAL_PTR (loc)->addr_list) | |
| 336 { | |
| 337 /* Bring in addr_list into canonical node. */ | |
| 338 struct elt_list *last = CSELIB_VAL_PTR (loc)->addr_list; | |
| 339 while (last->next) | |
| 340 last = last->next; | |
| 341 last->next = val->addr_list; | |
| 342 val->addr_list = CSELIB_VAL_PTR (loc)->addr_list; | |
| 343 CSELIB_VAL_PTR (loc)->addr_list = NULL; | |
| 344 } | |
| 345 | |
| 346 if (CSELIB_VAL_PTR (loc)->next_containing_mem != NULL | |
| 347 && val->next_containing_mem == NULL) | |
| 348 { | |
| 349 /* Add VAL to the containing_mem list after LOC. LOC will | |
| 350 be removed when we notice it doesn't contain any | |
| 351 MEMs. */ | |
| 352 val->next_containing_mem = CSELIB_VAL_PTR (loc)->next_containing_mem; | |
| 353 CSELIB_VAL_PTR (loc)->next_containing_mem = val; | |
| 354 } | |
| 355 | |
| 356 /* Chain LOC back to VAL. */ | |
| 357 el = elt_loc_list_pool.allocate (); | |
| 358 el->loc = val->val_rtx; | |
| 359 el->setting_insn = cselib_current_insn; | |
| 360 el->next = NULL; | |
| 361 CSELIB_VAL_PTR (loc)->locs = el; | |
| 362 } | |
| 363 | |
| 364 el = elt_loc_list_pool.allocate (); | |
| 365 el->loc = loc; | |
| 366 el->setting_insn = cselib_current_insn; | |
| 367 el->next = next; | |
| 368 val->locs = el; | |
| 0 | 369 } |
| 370 | |
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371 /* Promote loc L to a nondebug cselib_current_insn if L is marked as |
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372 originating from a debug insn, maintaining the debug values |
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373 count. */ |
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374 |
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375 static inline void |
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376 promote_debug_loc (struct elt_loc_list *l) |
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377 { |
| 111 | 378 if (l && l->setting_insn && DEBUG_INSN_P (l->setting_insn) |
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379 && (!cselib_current_insn || !DEBUG_INSN_P (cselib_current_insn))) |
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380 { |
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381 n_debug_values--; |
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382 l->setting_insn = cselib_current_insn; |
| 111 | 383 if (cselib_preserve_constants && l->next) |
| 384 { | |
| 385 gcc_assert (l->next->setting_insn | |
| 386 && DEBUG_INSN_P (l->next->setting_insn) | |
| 387 && !l->next->next); | |
| 388 l->next->setting_insn = cselib_current_insn; | |
| 389 } | |
| 390 else | |
| 391 gcc_assert (!l->next); | |
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392 } |
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393 } |
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394 |
| 0 | 395 /* The elt_list at *PL is no longer needed. Unchain it and free its |
| 396 storage. */ | |
| 397 | |
| 398 static inline void | |
| 399 unchain_one_elt_list (struct elt_list **pl) | |
| 400 { | |
| 401 struct elt_list *l = *pl; | |
| 402 | |
| 403 *pl = l->next; | |
| 111 | 404 elt_list_pool.remove (l); |
| 0 | 405 } |
| 406 | |
| 407 /* Likewise for elt_loc_lists. */ | |
| 408 | |
| 409 static void | |
| 410 unchain_one_elt_loc_list (struct elt_loc_list **pl) | |
| 411 { | |
| 412 struct elt_loc_list *l = *pl; | |
| 413 | |
| 414 *pl = l->next; | |
| 111 | 415 elt_loc_list_pool.remove (l); |
| 0 | 416 } |
| 417 | |
| 418 /* Likewise for cselib_vals. This also frees the addr_list associated with | |
| 419 V. */ | |
| 420 | |
| 421 static void | |
| 422 unchain_one_value (cselib_val *v) | |
| 423 { | |
| 424 while (v->addr_list) | |
| 425 unchain_one_elt_list (&v->addr_list); | |
| 426 | |
| 111 | 427 cselib_val_pool.remove (v); |
| 0 | 428 } |
| 429 | |
| 430 /* Remove all entries from the hash table. Also used during | |
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431 initialization. */ |
| 0 | 432 |
| 433 void | |
| 434 cselib_clear_table (void) | |
| 435 { | |
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436 cselib_reset_table (1); |
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437 } |
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438 |
| 111 | 439 /* Return TRUE if V is a constant, a function invariant or a VALUE |
| 440 equivalence; FALSE otherwise. */ | |
| 441 | |
| 442 static bool | |
| 443 invariant_or_equiv_p (cselib_val *v) | |
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444 { |
| 111 | 445 struct elt_loc_list *l; |
| 446 | |
| 447 if (v == cfa_base_preserved_val) | |
| 448 return true; | |
| 449 | |
| 450 /* Keep VALUE equivalences around. */ | |
| 451 for (l = v->locs; l; l = l->next) | |
| 452 if (GET_CODE (l->loc) == VALUE) | |
| 453 return true; | |
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454 |
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455 if (v->locs != NULL |
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456 && v->locs->next == NULL) |
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457 { |
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458 if (CONSTANT_P (v->locs->loc) |
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459 && (GET_CODE (v->locs->loc) != CONST |
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460 || !references_value_p (v->locs->loc, 0))) |
| 111 | 461 return true; |
| 462 /* Although a debug expr may be bound to different expressions, | |
| 463 we can preserve it as if it was constant, to get unification | |
| 464 and proper merging within var-tracking. */ | |
| 465 if (GET_CODE (v->locs->loc) == DEBUG_EXPR | |
| 466 || GET_CODE (v->locs->loc) == DEBUG_IMPLICIT_PTR | |
| 467 || GET_CODE (v->locs->loc) == ENTRY_VALUE | |
| 468 || GET_CODE (v->locs->loc) == DEBUG_PARAMETER_REF) | |
| 469 return true; | |
| 470 | |
| 471 /* (plus (value V) (const_int C)) is invariant iff V is invariant. */ | |
| 472 if (GET_CODE (v->locs->loc) == PLUS | |
| 473 && CONST_INT_P (XEXP (v->locs->loc, 1)) | |
| 474 && GET_CODE (XEXP (v->locs->loc, 0)) == VALUE | |
| 475 && invariant_or_equiv_p (CSELIB_VAL_PTR (XEXP (v->locs->loc, 0)))) | |
| 476 return true; | |
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477 } |
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478 |
| 111 | 479 return false; |
| 480 } | |
| 481 | |
| 482 /* Remove from hash table all VALUEs except constants, function | |
| 483 invariants and VALUE equivalences. */ | |
| 484 | |
| 485 int | |
| 486 preserve_constants_and_equivs (cselib_val **x, void *info ATTRIBUTE_UNUSED) | |
| 487 { | |
| 488 cselib_val *v = *x; | |
| 489 | |
| 490 if (invariant_or_equiv_p (v)) | |
| 491 { | |
| 492 cselib_hasher::key lookup = { | |
| 493 GET_MODE (v->val_rtx), v->val_rtx, VOIDmode | |
| 494 }; | |
| 495 cselib_val **slot | |
| 496 = cselib_preserved_hash_table->find_slot_with_hash (&lookup, | |
| 497 v->hash, INSERT); | |
| 498 gcc_assert (!*slot); | |
| 499 *slot = v; | |
| 500 } | |
| 501 | |
| 502 cselib_hash_table->clear_slot (x); | |
| 503 | |
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504 return 1; |
|
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505 } |
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506 |
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507 /* Remove all entries from the hash table, arranging for the next |
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508 value to be numbered NUM. */ |
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509 |
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510 void |
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511 cselib_reset_table (unsigned int num) |
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512 { |
| 0 | 513 unsigned int i; |
| 514 | |
| 515 max_value_regs = 0; | |
| 516 | |
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517 if (cfa_base_preserved_val) |
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518 { |
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519 unsigned int regno = cfa_base_preserved_regno; |
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520 unsigned int new_used_regs = 0; |
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521 for (i = 0; i < n_used_regs; i++) |
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522 if (used_regs[i] == regno) |
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523 { |
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524 new_used_regs = 1; |
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525 continue; |
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526 } |
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527 else |
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528 REG_VALUES (used_regs[i]) = 0; |
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529 gcc_assert (new_used_regs == 1); |
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530 n_used_regs = new_used_regs; |
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531 used_regs[0] = regno; |
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532 max_value_regs |
| 111 | 533 = hard_regno_nregs (regno, |
| 534 GET_MODE (cfa_base_preserved_val->locs->loc)); | |
|
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535 } |
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536 else |
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537 { |
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538 for (i = 0; i < n_used_regs; i++) |
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539 REG_VALUES (used_regs[i]) = 0; |
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540 n_used_regs = 0; |
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541 } |
| 0 | 542 |
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543 if (cselib_preserve_constants) |
| 111 | 544 cselib_hash_table->traverse <void *, preserve_constants_and_equivs> |
| 545 (NULL); | |
|
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546 else |
| 111 | 547 { |
| 548 cselib_hash_table->empty (); | |
| 549 gcc_checking_assert (!cselib_any_perm_equivs); | |
| 550 } | |
| 0 | 551 |
| 552 n_useless_values = 0; | |
|
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553 n_useless_debug_values = 0; |
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554 n_debug_values = 0; |
| 0 | 555 |
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556 next_uid = num; |
| 0 | 557 |
| 558 first_containing_mem = &dummy_val; | |
| 559 } | |
| 560 | |
|
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561 /* Return the number of the next value that will be generated. */ |
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562 |
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563 unsigned int |
|
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564 cselib_get_next_uid (void) |
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565 { |
|
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566 return next_uid; |
|
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567 } |
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568 |
|
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569 /* Search for X, whose hashcode is HASH, in CSELIB_HASH_TABLE, |
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570 INSERTing if requested. When X is part of the address of a MEM, |
| 111 | 571 MEMMODE should specify the mode of the MEM. */ |
| 572 | |
| 573 static cselib_val ** | |
| 574 cselib_find_slot (machine_mode mode, rtx x, hashval_t hash, | |
| 575 enum insert_option insert, machine_mode memmode) | |
| 0 | 576 { |
| 111 | 577 cselib_val **slot = NULL; |
| 578 cselib_hasher::key lookup = { mode, x, memmode }; | |
| 579 if (cselib_preserve_constants) | |
| 580 slot = cselib_preserved_hash_table->find_slot_with_hash (&lookup, hash, | |
| 581 NO_INSERT); | |
| 582 if (!slot) | |
| 583 slot = cselib_hash_table->find_slot_with_hash (&lookup, hash, insert); | |
| 584 return slot; | |
| 0 | 585 } |
| 586 | |
| 587 /* Return true if X contains a VALUE rtx. If ONLY_USELESS is set, we | |
| 588 only return true for values which point to a cselib_val whose value | |
| 589 element has been set to zero, which implies the cselib_val will be | |
| 590 removed. */ | |
| 591 | |
| 592 int | |
| 593 references_value_p (const_rtx x, int only_useless) | |
| 594 { | |
| 595 const enum rtx_code code = GET_CODE (x); | |
| 596 const char *fmt = GET_RTX_FORMAT (code); | |
| 597 int i, j; | |
| 598 | |
| 599 if (GET_CODE (x) == VALUE | |
| 111 | 600 && (! only_useless || |
| 601 (CSELIB_VAL_PTR (x)->locs == 0 && !PRESERVED_VALUE_P (x)))) | |
| 0 | 602 return 1; |
| 603 | |
| 604 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
| 605 { | |
| 606 if (fmt[i] == 'e' && references_value_p (XEXP (x, i), only_useless)) | |
| 607 return 1; | |
| 608 else if (fmt[i] == 'E') | |
| 609 for (j = 0; j < XVECLEN (x, i); j++) | |
| 610 if (references_value_p (XVECEXP (x, i, j), only_useless)) | |
| 611 return 1; | |
| 612 } | |
| 613 | |
| 614 return 0; | |
| 615 } | |
| 616 | |
| 617 /* For all locations found in X, delete locations that reference useless | |
| 618 values (i.e. values without any location). Called through | |
| 619 htab_traverse. */ | |
| 620 | |
| 111 | 621 int |
| 622 discard_useless_locs (cselib_val **x, void *info ATTRIBUTE_UNUSED) | |
| 0 | 623 { |
| 111 | 624 cselib_val *v = *x; |
| 0 | 625 struct elt_loc_list **p = &v->locs; |
|
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626 bool had_locs = v->locs != NULL; |
| 111 | 627 rtx_insn *setting_insn = v->locs ? v->locs->setting_insn : NULL; |
| 0 | 628 |
| 629 while (*p) | |
| 630 { | |
| 631 if (references_value_p ((*p)->loc, 1)) | |
| 632 unchain_one_elt_loc_list (p); | |
| 633 else | |
| 634 p = &(*p)->next; | |
| 635 } | |
| 636 | |
|
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637 if (had_locs && v->locs == 0 && !PRESERVED_VALUE_P (v->val_rtx)) |
| 0 | 638 { |
|
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639 if (setting_insn && DEBUG_INSN_P (setting_insn)) |
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640 n_useless_debug_values++; |
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641 else |
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642 n_useless_values++; |
| 0 | 643 values_became_useless = 1; |
| 644 } | |
| 645 return 1; | |
| 646 } | |
| 647 | |
| 648 /* If X is a value with no locations, remove it from the hashtable. */ | |
| 649 | |
| 111 | 650 int |
| 651 discard_useless_values (cselib_val **x, void *info ATTRIBUTE_UNUSED) | |
| 0 | 652 { |
| 111 | 653 cselib_val *v = *x; |
| 0 | 654 |
|
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655 if (v->locs == 0 && !PRESERVED_VALUE_P (v->val_rtx)) |
| 0 | 656 { |
| 657 if (cselib_discard_hook) | |
| 658 cselib_discard_hook (v); | |
| 659 | |
| 660 CSELIB_VAL_PTR (v->val_rtx) = NULL; | |
| 111 | 661 cselib_hash_table->clear_slot (x); |
| 0 | 662 unchain_one_value (v); |
| 663 n_useless_values--; | |
| 664 } | |
| 665 | |
| 666 return 1; | |
| 667 } | |
| 668 | |
| 669 /* Clean out useless values (i.e. those which no longer have locations | |
| 670 associated with them) from the hash table. */ | |
| 671 | |
| 672 static void | |
| 673 remove_useless_values (void) | |
| 674 { | |
| 675 cselib_val **p, *v; | |
|
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676 |
| 0 | 677 /* First pass: eliminate locations that reference the value. That in |
| 678 turn can make more values useless. */ | |
| 679 do | |
| 680 { | |
| 681 values_became_useless = 0; | |
| 111 | 682 cselib_hash_table->traverse <void *, discard_useless_locs> (NULL); |
| 0 | 683 } |
| 684 while (values_became_useless); | |
| 685 | |
| 686 /* Second pass: actually remove the values. */ | |
| 687 | |
| 688 p = &first_containing_mem; | |
| 689 for (v = *p; v != &dummy_val; v = v->next_containing_mem) | |
| 111 | 690 if (v->locs && v == canonical_cselib_val (v)) |
| 0 | 691 { |
| 692 *p = v; | |
| 693 p = &(*p)->next_containing_mem; | |
| 694 } | |
| 695 *p = &dummy_val; | |
| 696 | |
|
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697 n_useless_values += n_useless_debug_values; |
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698 n_debug_values -= n_useless_debug_values; |
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699 n_useless_debug_values = 0; |
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700 |
| 111 | 701 cselib_hash_table->traverse <void *, discard_useless_values> (NULL); |
| 0 | 702 |
| 703 gcc_assert (!n_useless_values); | |
| 704 } | |
| 705 | |
|
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706 /* Arrange for a value to not be removed from the hash table even if |
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707 it becomes useless. */ |
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708 |
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709 void |
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710 cselib_preserve_value (cselib_val *v) |
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711 { |
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712 PRESERVED_VALUE_P (v->val_rtx) = 1; |
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713 } |
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714 |
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715 /* Test whether a value is preserved. */ |
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716 |
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717 bool |
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718 cselib_preserved_value_p (cselib_val *v) |
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719 { |
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720 return PRESERVED_VALUE_P (v->val_rtx); |
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721 } |
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722 |
|
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723 /* Arrange for a REG value to be assumed constant through the whole function, |
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724 never invalidated and preserved across cselib_reset_table calls. */ |
|
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|
725 |
|
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726 void |
|
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727 cselib_preserve_cfa_base_value (cselib_val *v, unsigned int regno) |
|
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728 { |
|
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729 if (cselib_preserve_constants |
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730 && v->locs |
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731 && REG_P (v->locs->loc)) |
|
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732 { |
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733 cfa_base_preserved_val = v; |
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734 cfa_base_preserved_regno = regno; |
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735 } |
|
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736 } |
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737 |
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738 /* Clean all non-constant expressions in the hash table, but retain |
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739 their values. */ |
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740 |
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|
741 void |
|
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742 cselib_preserve_only_values (void) |
|
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743 { |
|
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744 int i; |
|
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745 |
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746 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) |
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747 cselib_invalidate_regno (i, reg_raw_mode[i]); |
|
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748 |
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749 cselib_invalidate_mem (callmem); |
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750 |
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751 remove_useless_values (); |
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752 |
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753 gcc_assert (first_containing_mem == &dummy_val); |
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754 } |
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755 |
| 111 | 756 /* Arrange for a value to be marked as based on stack pointer |
| 757 for find_base_term purposes. */ | |
| 758 | |
| 759 void | |
| 760 cselib_set_value_sp_based (cselib_val *v) | |
| 761 { | |
| 762 SP_BASED_VALUE_P (v->val_rtx) = 1; | |
| 763 } | |
| 764 | |
| 765 /* Test whether a value is based on stack pointer for | |
| 766 find_base_term purposes. */ | |
| 767 | |
| 768 bool | |
| 769 cselib_sp_based_value_p (cselib_val *v) | |
| 770 { | |
| 771 return SP_BASED_VALUE_P (v->val_rtx); | |
| 772 } | |
| 773 | |
| 0 | 774 /* Return the mode in which a register was last set. If X is not a |
| 775 register, return its mode. If the mode in which the register was | |
| 776 set is not known, or the value was already clobbered, return | |
| 777 VOIDmode. */ | |
| 778 | |
| 111 | 779 machine_mode |
| 0 | 780 cselib_reg_set_mode (const_rtx x) |
| 781 { | |
| 782 if (!REG_P (x)) | |
| 783 return GET_MODE (x); | |
| 784 | |
| 785 if (REG_VALUES (REGNO (x)) == NULL | |
| 786 || REG_VALUES (REGNO (x))->elt == NULL) | |
| 787 return VOIDmode; | |
| 788 | |
| 789 return GET_MODE (REG_VALUES (REGNO (x))->elt->val_rtx); | |
| 790 } | |
| 791 | |
|
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792 /* If x is a PLUS or an autoinc operation, expand the operation, |
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793 storing the offset, if any, in *OFF. */ |
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794 |
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795 static rtx |
| 111 | 796 autoinc_split (rtx x, rtx *off, machine_mode memmode) |
|
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797 { |
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798 switch (GET_CODE (x)) |
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799 { |
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800 case PLUS: |
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801 *off = XEXP (x, 1); |
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802 return XEXP (x, 0); |
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803 |
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804 case PRE_DEC: |
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805 if (memmode == VOIDmode) |
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806 return x; |
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807 |
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808 *off = GEN_INT (-GET_MODE_SIZE (memmode)); |
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809 return XEXP (x, 0); |
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810 |
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811 case PRE_INC: |
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812 if (memmode == VOIDmode) |
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813 return x; |
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814 |
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815 *off = GEN_INT (GET_MODE_SIZE (memmode)); |
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816 return XEXP (x, 0); |
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817 |
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818 case PRE_MODIFY: |
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819 return XEXP (x, 1); |
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820 |
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821 case POST_DEC: |
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822 case POST_INC: |
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823 case POST_MODIFY: |
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824 return XEXP (x, 0); |
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825 |
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826 default: |
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827 return x; |
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828 } |
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829 } |
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830 |
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831 /* Return nonzero if we can prove that X and Y contain the same value, |
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832 taking our gathered information into account. MEMMODE holds the |
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833 mode of the enclosing MEM, if any, as required to deal with autoinc |
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834 addressing modes. If X and Y are not (known to be) part of |
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835 addresses, MEMMODE should be VOIDmode. */ |
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836 |
| 111 | 837 int |
| 838 rtx_equal_for_cselib_1 (rtx x, rtx y, machine_mode memmode, int depth) | |
|
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|
839 { |
| 0 | 840 enum rtx_code code; |
| 841 const char *fmt; | |
| 842 int i; | |
| 843 | |
| 844 if (REG_P (x) || MEM_P (x)) | |
| 845 { | |
|
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|
846 cselib_val *e = cselib_lookup (x, GET_MODE (x), 0, memmode); |
| 0 | 847 |
| 848 if (e) | |
| 849 x = e->val_rtx; | |
| 850 } | |
| 851 | |
| 852 if (REG_P (y) || MEM_P (y)) | |
| 853 { | |
|
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|
854 cselib_val *e = cselib_lookup (y, GET_MODE (y), 0, memmode); |
| 0 | 855 |
| 856 if (e) | |
| 857 y = e->val_rtx; | |
| 858 } | |
| 859 | |
| 860 if (x == y) | |
| 861 return 1; | |
| 862 | |
| 863 if (GET_CODE (x) == VALUE) | |
| 864 { | |
| 111 | 865 cselib_val *e = canonical_cselib_val (CSELIB_VAL_PTR (x)); |
| 0 | 866 struct elt_loc_list *l; |
| 867 | |
| 111 | 868 if (GET_CODE (y) == VALUE) |
| 869 return e == canonical_cselib_val (CSELIB_VAL_PTR (y)); | |
| 870 | |
| 871 if (depth == 128) | |
| 872 return 0; | |
| 873 | |
| 0 | 874 for (l = e->locs; l; l = l->next) |
| 875 { | |
| 876 rtx t = l->loc; | |
| 877 | |
| 111 | 878 /* Avoid infinite recursion. We know we have the canonical |
| 879 value, so we can just skip any values in the equivalence | |
| 880 list. */ | |
| 881 if (REG_P (t) || MEM_P (t) || GET_CODE (t) == VALUE) | |
| 0 | 882 continue; |
| 111 | 883 else if (rtx_equal_for_cselib_1 (t, y, memmode, depth + 1)) |
| 0 | 884 return 1; |
| 885 } | |
| 886 | |
| 887 return 0; | |
| 888 } | |
| 111 | 889 else if (GET_CODE (y) == VALUE) |
| 0 | 890 { |
| 111 | 891 cselib_val *e = canonical_cselib_val (CSELIB_VAL_PTR (y)); |
| 0 | 892 struct elt_loc_list *l; |
| 893 | |
| 111 | 894 if (depth == 128) |
| 895 return 0; | |
| 896 | |
| 0 | 897 for (l = e->locs; l; l = l->next) |
| 898 { | |
| 899 rtx t = l->loc; | |
| 900 | |
| 111 | 901 if (REG_P (t) || MEM_P (t) || GET_CODE (t) == VALUE) |
| 0 | 902 continue; |
| 111 | 903 else if (rtx_equal_for_cselib_1 (x, t, memmode, depth + 1)) |
| 0 | 904 return 1; |
| 905 } | |
| 906 | |
| 907 return 0; | |
| 908 } | |
| 909 | |
|
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|
910 if (GET_MODE (x) != GET_MODE (y)) |
| 0 | 911 return 0; |
| 912 | |
|
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913 if (GET_CODE (x) != GET_CODE (y)) |
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914 { |
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915 rtx xorig = x, yorig = y; |
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916 rtx xoff = NULL, yoff = NULL; |
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|
917 |
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918 x = autoinc_split (x, &xoff, memmode); |
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919 y = autoinc_split (y, &yoff, memmode); |
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920 |
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921 if (!xoff != !yoff) |
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922 return 0; |
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923 |
| 111 | 924 if (xoff && !rtx_equal_for_cselib_1 (xoff, yoff, memmode, depth)) |
|
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925 return 0; |
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926 |
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927 /* Don't recurse if nothing changed. */ |
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928 if (x != xorig || y != yorig) |
| 111 | 929 return rtx_equal_for_cselib_1 (x, y, memmode, depth); |
|
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930 |
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931 return 0; |
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932 } |
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933 |
| 0 | 934 /* These won't be handled correctly by the code below. */ |
| 935 switch (GET_CODE (x)) | |
| 936 { | |
| 111 | 937 CASE_CONST_UNIQUE: |
|
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938 case DEBUG_EXPR: |
| 0 | 939 return 0; |
| 940 | |
|
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941 case DEBUG_IMPLICIT_PTR: |
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942 return DEBUG_IMPLICIT_PTR_DECL (x) |
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943 == DEBUG_IMPLICIT_PTR_DECL (y); |
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944 |
| 111 | 945 case DEBUG_PARAMETER_REF: |
| 946 return DEBUG_PARAMETER_REF_DECL (x) | |
| 947 == DEBUG_PARAMETER_REF_DECL (y); | |
| 948 | |
| 949 case ENTRY_VALUE: | |
| 950 /* ENTRY_VALUEs are function invariant, it is thus undesirable to | |
| 951 use rtx_equal_for_cselib_1 to compare the operands. */ | |
| 952 return rtx_equal_p (ENTRY_VALUE_EXP (x), ENTRY_VALUE_EXP (y)); | |
| 953 | |
| 0 | 954 case LABEL_REF: |
| 111 | 955 return label_ref_label (x) == label_ref_label (y); |
| 956 | |
| 957 case REG: | |
| 958 return REGNO (x) == REGNO (y); | |
| 0 | 959 |
|
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960 case MEM: |
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961 /* We have to compare any autoinc operations in the addresses |
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962 using this MEM's mode. */ |
| 111 | 963 return rtx_equal_for_cselib_1 (XEXP (x, 0), XEXP (y, 0), GET_MODE (x), |
| 964 depth); | |
|
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965 |
| 0 | 966 default: |
| 967 break; | |
| 968 } | |
| 969 | |
| 970 code = GET_CODE (x); | |
| 971 fmt = GET_RTX_FORMAT (code); | |
| 972 | |
| 973 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
| 974 { | |
| 975 int j; | |
| 976 | |
| 977 switch (fmt[i]) | |
| 978 { | |
| 979 case 'w': | |
| 980 if (XWINT (x, i) != XWINT (y, i)) | |
| 981 return 0; | |
| 982 break; | |
| 983 | |
| 984 case 'n': | |
| 985 case 'i': | |
| 986 if (XINT (x, i) != XINT (y, i)) | |
| 987 return 0; | |
| 988 break; | |
| 989 | |
| 990 case 'V': | |
| 991 case 'E': | |
| 992 /* Two vectors must have the same length. */ | |
| 993 if (XVECLEN (x, i) != XVECLEN (y, i)) | |
| 994 return 0; | |
| 995 | |
| 996 /* And the corresponding elements must match. */ | |
| 997 for (j = 0; j < XVECLEN (x, i); j++) | |
|
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998 if (! rtx_equal_for_cselib_1 (XVECEXP (x, i, j), |
| 111 | 999 XVECEXP (y, i, j), memmode, depth)) |
| 0 | 1000 return 0; |
| 1001 break; | |
| 1002 | |
| 1003 case 'e': | |
| 1004 if (i == 1 | |
| 1005 && targetm.commutative_p (x, UNKNOWN) | |
| 111 | 1006 && rtx_equal_for_cselib_1 (XEXP (x, 1), XEXP (y, 0), memmode, |
| 1007 depth) | |
| 1008 && rtx_equal_for_cselib_1 (XEXP (x, 0), XEXP (y, 1), memmode, | |
| 1009 depth)) | |
| 0 | 1010 return 1; |
| 111 | 1011 if (! rtx_equal_for_cselib_1 (XEXP (x, i), XEXP (y, i), memmode, |
| 1012 depth)) | |
| 0 | 1013 return 0; |
| 1014 break; | |
| 1015 | |
| 1016 case 'S': | |
| 1017 case 's': | |
| 1018 if (strcmp (XSTR (x, i), XSTR (y, i))) | |
| 1019 return 0; | |
| 1020 break; | |
| 1021 | |
| 1022 case 'u': | |
| 1023 /* These are just backpointers, so they don't matter. */ | |
| 1024 break; | |
| 1025 | |
| 1026 case '0': | |
| 1027 case 't': | |
| 1028 break; | |
| 1029 | |
| 1030 /* It is believed that rtx's at this level will never | |
| 1031 contain anything but integers and other rtx's, | |
| 1032 except for within LABEL_REFs and SYMBOL_REFs. */ | |
| 1033 default: | |
| 1034 gcc_unreachable (); | |
| 1035 } | |
| 1036 } | |
| 1037 return 1; | |
| 1038 } | |
| 1039 | |
| 1040 /* Hash an rtx. Return 0 if we couldn't hash the rtx. | |
| 1041 For registers and memory locations, we look up their cselib_val structure | |
| 1042 and return its VALUE element. | |
| 1043 Possible reasons for return 0 are: the object is volatile, or we couldn't | |
| 1044 find a register or memory location in the table and CREATE is zero. If | |
| 1045 CREATE is nonzero, table elts are created for regs and mem. | |
| 1046 N.B. this hash function returns the same hash value for RTXes that | |
| 1047 differ only in the order of operands, thus it is suitable for comparisons | |
| 1048 that take commutativity into account. | |
| 1049 If we wanted to also support associative rules, we'd have to use a different | |
| 1050 strategy to avoid returning spurious 0, e.g. return ~(~0U >> 1) . | |
|
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1051 MEMMODE indicates the mode of an enclosing MEM, and it's only |
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1052 used to compute autoinc values. |
| 0 | 1053 We used to have a MODE argument for hashing for CONST_INTs, but that |
| 1054 didn't make sense, since it caused spurious hash differences between | |
| 1055 (set (reg:SI 1) (const_int)) | |
| 1056 (plus:SI (reg:SI 2) (reg:SI 1)) | |
| 1057 and | |
| 1058 (plus:SI (reg:SI 2) (const_int)) | |
| 1059 If the mode is important in any context, it must be checked specifically | |
| 1060 in a comparison anyway, since relying on hash differences is unsafe. */ | |
| 1061 | |
| 1062 static unsigned int | |
| 111 | 1063 cselib_hash_rtx (rtx x, int create, machine_mode memmode) |
| 0 | 1064 { |
| 1065 cselib_val *e; | |
| 1066 int i, j; | |
| 1067 enum rtx_code code; | |
| 1068 const char *fmt; | |
| 1069 unsigned int hash = 0; | |
| 1070 | |
| 1071 code = GET_CODE (x); | |
| 1072 hash += (unsigned) code + (unsigned) GET_MODE (x); | |
| 1073 | |
| 1074 switch (code) | |
| 1075 { | |
| 111 | 1076 case VALUE: |
| 1077 e = CSELIB_VAL_PTR (x); | |
| 1078 return e->hash; | |
| 1079 | |
| 0 | 1080 case MEM: |
| 1081 case REG: | |
|
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1082 e = cselib_lookup (x, GET_MODE (x), create, memmode); |
| 0 | 1083 if (! e) |
| 1084 return 0; | |
| 1085 | |
|
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1086 return e->hash; |
| 0 | 1087 |
|
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1088 case DEBUG_EXPR: |
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1089 hash += ((unsigned) DEBUG_EXPR << 7) |
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1090 + DEBUG_TEMP_UID (DEBUG_EXPR_TREE_DECL (x)); |
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1091 return hash ? hash : (unsigned int) DEBUG_EXPR; |
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1092 |
|
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1093 case DEBUG_IMPLICIT_PTR: |
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1094 hash += ((unsigned) DEBUG_IMPLICIT_PTR << 7) |
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1095 + DECL_UID (DEBUG_IMPLICIT_PTR_DECL (x)); |
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1096 return hash ? hash : (unsigned int) DEBUG_IMPLICIT_PTR; |
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1097 |
| 111 | 1098 case DEBUG_PARAMETER_REF: |
| 1099 hash += ((unsigned) DEBUG_PARAMETER_REF << 7) | |
| 1100 + DECL_UID (DEBUG_PARAMETER_REF_DECL (x)); | |
| 1101 return hash ? hash : (unsigned int) DEBUG_PARAMETER_REF; | |
| 1102 | |
| 1103 case ENTRY_VALUE: | |
| 1104 /* ENTRY_VALUEs are function invariant, thus try to avoid | |
| 1105 recursing on argument if ENTRY_VALUE is one of the | |
| 1106 forms emitted by expand_debug_expr, otherwise | |
| 1107 ENTRY_VALUE hash would depend on the current value | |
| 1108 in some register or memory. */ | |
| 1109 if (REG_P (ENTRY_VALUE_EXP (x))) | |
| 1110 hash += (unsigned int) REG | |
| 1111 + (unsigned int) GET_MODE (ENTRY_VALUE_EXP (x)) | |
| 1112 + (unsigned int) REGNO (ENTRY_VALUE_EXP (x)); | |
| 1113 else if (MEM_P (ENTRY_VALUE_EXP (x)) | |
| 1114 && REG_P (XEXP (ENTRY_VALUE_EXP (x), 0))) | |
| 1115 hash += (unsigned int) MEM | |
| 1116 + (unsigned int) GET_MODE (XEXP (ENTRY_VALUE_EXP (x), 0)) | |
| 1117 + (unsigned int) REGNO (XEXP (ENTRY_VALUE_EXP (x), 0)); | |
| 1118 else | |
| 1119 hash += cselib_hash_rtx (ENTRY_VALUE_EXP (x), create, memmode); | |
| 1120 return hash ? hash : (unsigned int) ENTRY_VALUE; | |
| 1121 | |
| 0 | 1122 case CONST_INT: |
| 111 | 1123 hash += ((unsigned) CONST_INT << 7) + UINTVAL (x); |
| 0 | 1124 return hash ? hash : (unsigned int) CONST_INT; |
| 1125 | |
| 111 | 1126 case CONST_WIDE_INT: |
| 1127 for (i = 0; i < CONST_WIDE_INT_NUNITS (x); i++) | |
| 1128 hash += CONST_WIDE_INT_ELT (x, i); | |
| 1129 return hash; | |
| 1130 | |
| 0 | 1131 case CONST_DOUBLE: |
| 1132 /* This is like the general case, except that it only counts | |
| 1133 the integers representing the constant. */ | |
| 1134 hash += (unsigned) code + (unsigned) GET_MODE (x); | |
| 111 | 1135 if (TARGET_SUPPORTS_WIDE_INT == 0 && GET_MODE (x) == VOIDmode) |
| 0 | 1136 hash += ((unsigned) CONST_DOUBLE_LOW (x) |
| 1137 + (unsigned) CONST_DOUBLE_HIGH (x)); | |
| 111 | 1138 else |
| 1139 hash += real_hash (CONST_DOUBLE_REAL_VALUE (x)); | |
| 0 | 1140 return hash ? hash : (unsigned int) CONST_DOUBLE; |
| 1141 | |
| 1142 case CONST_FIXED: | |
| 1143 hash += (unsigned int) code + (unsigned int) GET_MODE (x); | |
| 1144 hash += fixed_hash (CONST_FIXED_VALUE (x)); | |
| 1145 return hash ? hash : (unsigned int) CONST_FIXED; | |
| 1146 | |
| 1147 case CONST_VECTOR: | |
| 1148 { | |
| 1149 int units; | |
| 1150 rtx elt; | |
| 1151 | |
| 1152 units = CONST_VECTOR_NUNITS (x); | |
| 1153 | |
| 1154 for (i = 0; i < units; ++i) | |
| 1155 { | |
| 1156 elt = CONST_VECTOR_ELT (x, i); | |
|
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1157 hash += cselib_hash_rtx (elt, 0, memmode); |
| 0 | 1158 } |
| 1159 | |
| 1160 return hash; | |
| 1161 } | |
| 1162 | |
| 1163 /* Assume there is only one rtx object for any given label. */ | |
| 1164 case LABEL_REF: | |
| 1165 /* We don't hash on the address of the CODE_LABEL to avoid bootstrap | |
| 1166 differences and differences between each stage's debugging dumps. */ | |
| 1167 hash += (((unsigned int) LABEL_REF << 7) | |
| 111 | 1168 + CODE_LABEL_NUMBER (label_ref_label (x))); |
| 0 | 1169 return hash ? hash : (unsigned int) LABEL_REF; |
| 1170 | |
| 1171 case SYMBOL_REF: | |
| 1172 { | |
| 1173 /* Don't hash on the symbol's address to avoid bootstrap differences. | |
| 1174 Different hash values may cause expressions to be recorded in | |
| 1175 different orders and thus different registers to be used in the | |
| 1176 final assembler. This also avoids differences in the dump files | |
| 1177 between various stages. */ | |
| 1178 unsigned int h = 0; | |
| 1179 const unsigned char *p = (const unsigned char *) XSTR (x, 0); | |
| 1180 | |
| 1181 while (*p) | |
| 1182 h += (h << 7) + *p++; /* ??? revisit */ | |
| 1183 | |
| 1184 hash += ((unsigned int) SYMBOL_REF << 7) + h; | |
| 1185 return hash ? hash : (unsigned int) SYMBOL_REF; | |
| 1186 } | |
| 1187 | |
| 1188 case PRE_DEC: | |
| 1189 case PRE_INC: | |
|
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1190 /* We can't compute these without knowing the MEM mode. */ |
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1191 gcc_assert (memmode != VOIDmode); |
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1192 i = GET_MODE_SIZE (memmode); |
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1193 if (code == PRE_DEC) |
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1194 i = -i; |
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1195 /* Adjust the hash so that (mem:MEMMODE (pre_* (reg))) hashes |
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1196 like (mem:MEMMODE (plus (reg) (const_int I))). */ |
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1197 hash += (unsigned) PLUS - (unsigned)code |
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1198 + cselib_hash_rtx (XEXP (x, 0), create, memmode) |
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1199 + cselib_hash_rtx (GEN_INT (i), create, memmode); |
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1200 return hash ? hash : 1 + (unsigned) PLUS; |
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1201 |
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1202 case PRE_MODIFY: |
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1203 gcc_assert (memmode != VOIDmode); |
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1204 return cselib_hash_rtx (XEXP (x, 1), create, memmode); |
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1205 |
| 0 | 1206 case POST_DEC: |
| 1207 case POST_INC: | |
| 1208 case POST_MODIFY: | |
|
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1209 gcc_assert (memmode != VOIDmode); |
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1210 return cselib_hash_rtx (XEXP (x, 0), create, memmode); |
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1211 |
| 0 | 1212 case PC: |
| 1213 case CC0: | |
| 1214 case CALL: | |
| 1215 case UNSPEC_VOLATILE: | |
| 1216 return 0; | |
| 1217 | |
| 1218 case ASM_OPERANDS: | |
| 1219 if (MEM_VOLATILE_P (x)) | |
| 1220 return 0; | |
| 1221 | |
| 1222 break; | |
| 1223 | |
| 1224 default: | |
| 1225 break; | |
| 1226 } | |
| 1227 | |
| 1228 i = GET_RTX_LENGTH (code) - 1; | |
| 1229 fmt = GET_RTX_FORMAT (code); | |
| 1230 for (; i >= 0; i--) | |
| 1231 { | |
| 1232 switch (fmt[i]) | |
| 1233 { | |
| 1234 case 'e': | |
| 1235 { | |
| 1236 rtx tem = XEXP (x, i); | |
|
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1237 unsigned int tem_hash = cselib_hash_rtx (tem, create, memmode); |
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1238 |
| 0 | 1239 if (tem_hash == 0) |
| 1240 return 0; | |
|
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1241 |
| 0 | 1242 hash += tem_hash; |
| 1243 } | |
| 1244 break; | |
| 1245 case 'E': | |
| 1246 for (j = 0; j < XVECLEN (x, i); j++) | |
| 1247 { | |
| 1248 unsigned int tem_hash | |
|
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1249 = cselib_hash_rtx (XVECEXP (x, i, j), create, memmode); |
|
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1250 |
| 0 | 1251 if (tem_hash == 0) |
| 1252 return 0; | |
|
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1253 |
| 0 | 1254 hash += tem_hash; |
| 1255 } | |
| 1256 break; | |
| 1257 | |
| 1258 case 's': | |
| 1259 { | |
| 1260 const unsigned char *p = (const unsigned char *) XSTR (x, i); | |
|
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1261 |
| 0 | 1262 if (p) |
| 1263 while (*p) | |
| 1264 hash += *p++; | |
| 1265 break; | |
| 1266 } | |
|
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1267 |
| 0 | 1268 case 'i': |
| 1269 hash += XINT (x, i); | |
| 1270 break; | |
| 1271 | |
| 1272 case '0': | |
| 1273 case 't': | |
| 1274 /* unused */ | |
| 1275 break; | |
|
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1276 |
| 0 | 1277 default: |
| 1278 gcc_unreachable (); | |
| 1279 } | |
| 1280 } | |
| 1281 | |
| 1282 return hash ? hash : 1 + (unsigned int) GET_CODE (x); | |
| 1283 } | |
| 1284 | |
| 1285 /* Create a new value structure for VALUE and initialize it. The mode of the | |
| 1286 value is MODE. */ | |
| 1287 | |
| 1288 static inline cselib_val * | |
| 111 | 1289 new_cselib_val (unsigned int hash, machine_mode mode, rtx x) |
| 0 | 1290 { |
| 111 | 1291 cselib_val *e = cselib_val_pool.allocate (); |
| 0 | 1292 |
|
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1293 gcc_assert (hash); |
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1294 gcc_assert (next_uid); |
| 0 | 1295 |
|
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1296 e->hash = hash; |
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1297 e->uid = next_uid++; |
| 0 | 1298 /* We use an alloc pool to allocate this RTL construct because it |
| 1299 accounts for about 8% of the overall memory usage. We know | |
| 1300 precisely when we can have VALUE RTXen (when cselib is active) | |
| 1301 so we don't need to put them in garbage collected memory. | |
| 1302 ??? Why should a VALUE be an RTX in the first place? */ | |
| 111 | 1303 e->val_rtx = (rtx_def*) value_pool.allocate (); |
| 0 | 1304 memset (e->val_rtx, 0, RTX_HDR_SIZE); |
| 1305 PUT_CODE (e->val_rtx, VALUE); | |
| 1306 PUT_MODE (e->val_rtx, mode); | |
| 1307 CSELIB_VAL_PTR (e->val_rtx) = e; | |
| 1308 e->addr_list = 0; | |
| 1309 e->locs = 0; | |
| 1310 e->next_containing_mem = 0; | |
|
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1311 |
|
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1312 if (dump_file && (dump_flags & TDF_CSELIB)) |
|
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1313 { |
|
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1314 fprintf (dump_file, "cselib value %u:%u ", e->uid, hash); |
|
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1315 if (flag_dump_noaddr || flag_dump_unnumbered) |
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1316 fputs ("# ", dump_file); |
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1317 else |
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1318 fprintf (dump_file, "%p ", (void*)e); |
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1319 print_rtl_single (dump_file, x); |
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1320 fputc ('\n', dump_file); |
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1321 } |
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1322 |
| 0 | 1323 return e; |
| 1324 } | |
| 1325 | |
| 1326 /* ADDR_ELT is a value that is used as address. MEM_ELT is the value that | |
| 1327 contains the data at this address. X is a MEM that represents the | |
| 1328 value. Update the two value structures to represent this situation. */ | |
| 1329 | |
| 1330 static void | |
| 1331 add_mem_for_addr (cselib_val *addr_elt, cselib_val *mem_elt, rtx x) | |
| 1332 { | |
| 111 | 1333 addr_elt = canonical_cselib_val (addr_elt); |
| 1334 mem_elt = canonical_cselib_val (mem_elt); | |
| 0 | 1335 |
| 1336 /* Avoid duplicates. */ | |
| 111 | 1337 addr_space_t as = MEM_ADDR_SPACE (x); |
| 1338 for (elt_loc_list *l = mem_elt->locs; l; l = l->next) | |
| 0 | 1339 if (MEM_P (l->loc) |
| 111 | 1340 && CSELIB_VAL_PTR (XEXP (l->loc, 0)) == addr_elt |
| 1341 && MEM_ADDR_SPACE (l->loc) == as) | |
|
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1342 { |
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1343 promote_debug_loc (l); |
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1344 return; |
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1345 } |
| 0 | 1346 |
| 1347 addr_elt->addr_list = new_elt_list (addr_elt->addr_list, mem_elt); | |
| 111 | 1348 new_elt_loc_list (mem_elt, |
| 1349 replace_equiv_address_nv (x, addr_elt->val_rtx)); | |
| 0 | 1350 if (mem_elt->next_containing_mem == NULL) |
| 1351 { | |
| 1352 mem_elt->next_containing_mem = first_containing_mem; | |
| 1353 first_containing_mem = mem_elt; | |
| 1354 } | |
| 1355 } | |
| 1356 | |
| 1357 /* Subroutine of cselib_lookup. Return a value for X, which is a MEM rtx. | |
| 1358 If CREATE, make a new one if we haven't seen it before. */ | |
| 1359 | |
| 1360 static cselib_val * | |
| 1361 cselib_lookup_mem (rtx x, int create) | |
| 1362 { | |
| 111 | 1363 machine_mode mode = GET_MODE (x); |
| 1364 machine_mode addr_mode; | |
| 1365 cselib_val **slot; | |
| 0 | 1366 cselib_val *addr; |
| 1367 cselib_val *mem_elt; | |
| 1368 | |
| 1369 if (MEM_VOLATILE_P (x) || mode == BLKmode | |
| 1370 || !cselib_record_memory | |
| 1371 || (FLOAT_MODE_P (mode) && flag_float_store)) | |
| 1372 return 0; | |
| 1373 | |
|
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1374 addr_mode = GET_MODE (XEXP (x, 0)); |
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1375 if (addr_mode == VOIDmode) |
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1376 addr_mode = Pmode; |
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1377 |
| 0 | 1378 /* Look up the value for the address. */ |
|
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1379 addr = cselib_lookup (XEXP (x, 0), addr_mode, create, mode); |
| 0 | 1380 if (! addr) |
| 1381 return 0; | |
| 111 | 1382 addr = canonical_cselib_val (addr); |
| 0 | 1383 |
| 1384 /* Find a value that describes a value of our mode at that address. */ | |
| 111 | 1385 addr_space_t as = MEM_ADDR_SPACE (x); |
| 1386 for (elt_list *l = addr->addr_list; l; l = l->next) | |
| 0 | 1387 if (GET_MODE (l->elt->val_rtx) == mode) |
|
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1388 { |
| 111 | 1389 for (elt_loc_list *l2 = l->elt->locs; l2; l2 = l2->next) |
| 1390 if (MEM_P (l2->loc) && MEM_ADDR_SPACE (l2->loc) == as) | |
| 1391 { | |
| 1392 promote_debug_loc (l->elt->locs); | |
| 1393 return l->elt; | |
| 1394 } | |
|
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1395 } |
| 0 | 1396 |
| 1397 if (! create) | |
| 1398 return 0; | |
| 1399 | |
|
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1400 mem_elt = new_cselib_val (next_uid, mode, x); |
| 0 | 1401 add_mem_for_addr (addr, mem_elt, x); |
| 111 | 1402 slot = cselib_find_slot (mode, x, mem_elt->hash, INSERT, VOIDmode); |
| 0 | 1403 *slot = mem_elt; |
| 1404 return mem_elt; | |
| 1405 } | |
| 1406 | |
| 111 | 1407 /* Search through the possible substitutions in P. We prefer a non reg |
| 0 | 1408 substitution because this allows us to expand the tree further. If |
| 1409 we find, just a reg, take the lowest regno. There may be several | |
| 1410 non-reg results, we just take the first one because they will all | |
| 1411 expand to the same place. */ | |
| 1412 | |
|
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1413 static rtx |
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1414 expand_loc (struct elt_loc_list *p, struct expand_value_data *evd, |
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1415 int max_depth) |
| 0 | 1416 { |
| 1417 rtx reg_result = NULL; | |
| 1418 unsigned int regno = UINT_MAX; | |
| 1419 struct elt_loc_list *p_in = p; | |
| 1420 | |
| 111 | 1421 for (; p; p = p->next) |
| 0 | 1422 { |
| 111 | 1423 /* Return these right away to avoid returning stack pointer based |
| 1424 expressions for frame pointer and vice versa, which is something | |
| 1425 that would confuse DSE. See the comment in cselib_expand_value_rtx_1 | |
| 1426 for more details. */ | |
| 1427 if (REG_P (p->loc) | |
| 1428 && (REGNO (p->loc) == STACK_POINTER_REGNUM | |
| 1429 || REGNO (p->loc) == FRAME_POINTER_REGNUM | |
| 1430 || REGNO (p->loc) == HARD_FRAME_POINTER_REGNUM | |
| 1431 || REGNO (p->loc) == cfa_base_preserved_regno)) | |
| 1432 return p->loc; | |
| 0 | 1433 /* Avoid infinite recursion trying to expand a reg into a |
| 1434 the same reg. */ | |
|
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1435 if ((REG_P (p->loc)) |
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1436 && (REGNO (p->loc) < regno) |
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1437 && !bitmap_bit_p (evd->regs_active, REGNO (p->loc))) |
| 0 | 1438 { |
| 1439 reg_result = p->loc; | |
| 1440 regno = REGNO (p->loc); | |
| 1441 } | |
| 1442 /* Avoid infinite recursion and do not try to expand the | |
| 1443 value. */ | |
|
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1444 else if (GET_CODE (p->loc) == VALUE |
| 0 | 1445 && CSELIB_VAL_PTR (p->loc)->locs == p_in) |
| 1446 continue; | |
| 1447 else if (!REG_P (p->loc)) | |
| 1448 { | |
| 1449 rtx result, note; | |
|
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1450 if (dump_file && (dump_flags & TDF_CSELIB)) |
| 0 | 1451 { |
| 1452 print_inline_rtx (dump_file, p->loc, 0); | |
| 1453 fprintf (dump_file, "\n"); | |
| 1454 } | |
| 1455 if (GET_CODE (p->loc) == LO_SUM | |
| 1456 && GET_CODE (XEXP (p->loc, 1)) == SYMBOL_REF | |
| 1457 && p->setting_insn | |
| 1458 && (note = find_reg_note (p->setting_insn, REG_EQUAL, NULL_RTX)) | |
| 1459 && XEXP (note, 0) == XEXP (p->loc, 1)) | |
| 1460 return XEXP (p->loc, 1); | |
|
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1461 result = cselib_expand_value_rtx_1 (p->loc, evd, max_depth - 1); |
| 0 | 1462 if (result) |
| 1463 return result; | |
| 1464 } | |
|
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1465 |
| 0 | 1466 } |
|
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1467 |
| 0 | 1468 if (regno != UINT_MAX) |
| 1469 { | |
| 1470 rtx result; | |
|
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1471 if (dump_file && (dump_flags & TDF_CSELIB)) |
| 0 | 1472 fprintf (dump_file, "r%d\n", regno); |
| 1473 | |
|
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1474 result = cselib_expand_value_rtx_1 (reg_result, evd, max_depth - 1); |
| 0 | 1475 if (result) |
| 1476 return result; | |
| 1477 } | |
| 1478 | |
|
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1479 if (dump_file && (dump_flags & TDF_CSELIB)) |
| 0 | 1480 { |
| 1481 if (reg_result) | |
| 1482 { | |
| 1483 print_inline_rtx (dump_file, reg_result, 0); | |
| 1484 fprintf (dump_file, "\n"); | |
| 1485 } | |
|
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1486 else |
| 0 | 1487 fprintf (dump_file, "NULL\n"); |
| 1488 } | |
| 1489 return reg_result; | |
| 1490 } | |
| 1491 | |
| 1492 | |
| 1493 /* Forward substitute and expand an expression out to its roots. | |
| 1494 This is the opposite of common subexpression. Because local value | |
| 1495 numbering is such a weak optimization, the expanded expression is | |
| 1496 pretty much unique (not from a pointer equals point of view but | |
|
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|
1497 from a tree shape point of view. |
| 0 | 1498 |
| 1499 This function returns NULL if the expansion fails. The expansion | |
| 1500 will fail if there is no value number for one of the operands or if | |
| 1501 one of the operands has been overwritten between the current insn | |
| 1502 and the beginning of the basic block. For instance x has no | |
| 1503 expansion in: | |
| 1504 | |
| 1505 r1 <- r1 + 3 | |
| 1506 x <- r1 + 8 | |
| 1507 | |
| 1508 REGS_ACTIVE is a scratch bitmap that should be clear when passing in. | |
| 1509 It is clear on return. */ | |
| 1510 | |
| 1511 rtx | |
| 1512 cselib_expand_value_rtx (rtx orig, bitmap regs_active, int max_depth) | |
| 1513 { | |
|
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|
1514 struct expand_value_data evd; |
|
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|
1515 |
|
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|
1516 evd.regs_active = regs_active; |
|
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|
1517 evd.callback = NULL; |
|
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|
1518 evd.callback_arg = NULL; |
|
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|
1519 evd.dummy = false; |
|
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|
1520 |
|
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|
1521 return cselib_expand_value_rtx_1 (orig, &evd, max_depth); |
|
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1522 } |
|
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|
1523 |
|
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|
1524 /* Same as cselib_expand_value_rtx, but using a callback to try to |
|
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|
1525 resolve some expressions. The CB function should return ORIG if it |
|
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|
1526 can't or does not want to deal with a certain RTX. Any other |
|
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|
1527 return value, including NULL, will be used as the expansion for |
|
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|
1528 VALUE, without any further changes. */ |
|
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|
1529 |
|
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|
1530 rtx |
|
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1531 cselib_expand_value_rtx_cb (rtx orig, bitmap regs_active, int max_depth, |
|
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1532 cselib_expand_callback cb, void *data) |
|
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|
1533 { |
|
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|
1534 struct expand_value_data evd; |
|
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|
1535 |
|
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|
1536 evd.regs_active = regs_active; |
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|
1537 evd.callback = cb; |
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|
1538 evd.callback_arg = data; |
|
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|
1539 evd.dummy = false; |
|
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|
1540 |
|
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1541 return cselib_expand_value_rtx_1 (orig, &evd, max_depth); |
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|
1542 } |
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|
1543 |
|
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|
1544 /* Similar to cselib_expand_value_rtx_cb, but no rtxs are actually copied |
|
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|
1545 or simplified. Useful to find out whether cselib_expand_value_rtx_cb |
|
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1546 would return NULL or non-NULL, without allocating new rtx. */ |
|
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|
1547 |
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|
1548 bool |
|
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|
1549 cselib_dummy_expand_value_rtx_cb (rtx orig, bitmap regs_active, int max_depth, |
|
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|
1550 cselib_expand_callback cb, void *data) |
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|
1551 { |
|
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|
1552 struct expand_value_data evd; |
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|
1553 |
|
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|
1554 evd.regs_active = regs_active; |
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|
1555 evd.callback = cb; |
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|
1556 evd.callback_arg = data; |
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|
1557 evd.dummy = true; |
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|
1558 |
|
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1559 return cselib_expand_value_rtx_1 (orig, &evd, max_depth) != NULL; |
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|
1560 } |
|
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|
1561 |
|
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|
1562 /* Internal implementation of cselib_expand_value_rtx and |
|
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|
1563 cselib_expand_value_rtx_cb. */ |
|
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|
1564 |
|
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|
1565 static rtx |
|
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|
1566 cselib_expand_value_rtx_1 (rtx orig, struct expand_value_data *evd, |
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|
1567 int max_depth) |
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|
1568 { |
| 0 | 1569 rtx copy, scopy; |
| 1570 int i, j; | |
| 1571 RTX_CODE code; | |
| 1572 const char *format_ptr; | |
| 111 | 1573 machine_mode mode; |
| 0 | 1574 |
| 1575 code = GET_CODE (orig); | |
| 1576 | |
| 1577 /* For the context of dse, if we end up expand into a huge tree, we | |
| 1578 will not have a useful address, so we might as well just give up | |
| 1579 quickly. */ | |
| 1580 if (max_depth <= 0) | |
| 1581 return NULL; | |
| 1582 | |
| 1583 switch (code) | |
| 1584 { | |
| 1585 case REG: | |
| 1586 { | |
| 1587 struct elt_list *l = REG_VALUES (REGNO (orig)); | |
| 1588 | |
| 1589 if (l && l->elt == NULL) | |
| 1590 l = l->next; | |
| 1591 for (; l; l = l->next) | |
| 1592 if (GET_MODE (l->elt->val_rtx) == GET_MODE (orig)) | |
| 1593 { | |
| 1594 rtx result; | |
| 111 | 1595 unsigned regno = REGNO (orig); |
|
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|
1596 |
| 0 | 1597 /* The only thing that we are not willing to do (this |
| 1598 is requirement of dse and if others potential uses | |
| 1599 need this function we should add a parm to control | |
| 1600 it) is that we will not substitute the | |
| 1601 STACK_POINTER_REGNUM, FRAME_POINTER or the | |
| 1602 HARD_FRAME_POINTER. | |
| 1603 | |
| 1604 These expansions confuses the code that notices that | |
| 1605 stores into the frame go dead at the end of the | |
| 1606 function and that the frame is not effected by calls | |
| 1607 to subroutines. If you allow the | |
| 1608 STACK_POINTER_REGNUM substitution, then dse will | |
| 1609 think that parameter pushing also goes dead which is | |
| 1610 wrong. If you allow the FRAME_POINTER or the | |
| 1611 HARD_FRAME_POINTER then you lose the opportunity to | |
| 1612 make the frame assumptions. */ | |
| 1613 if (regno == STACK_POINTER_REGNUM | |
| 1614 || regno == FRAME_POINTER_REGNUM | |
| 111 | 1615 || regno == HARD_FRAME_POINTER_REGNUM |
| 1616 || regno == cfa_base_preserved_regno) | |
| 0 | 1617 return orig; |
| 1618 | |
|
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|
1619 bitmap_set_bit (evd->regs_active, regno); |
| 0 | 1620 |
|
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|
1621 if (dump_file && (dump_flags & TDF_CSELIB)) |
| 0 | 1622 fprintf (dump_file, "expanding: r%d into: ", regno); |
| 1623 | |
|
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1624 result = expand_loc (l->elt->locs, evd, max_depth); |
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|
1625 bitmap_clear_bit (evd->regs_active, regno); |
| 0 | 1626 |
| 1627 if (result) | |
| 1628 return result; | |
|
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|
1629 else |
| 0 | 1630 return orig; |
| 1631 } | |
| 111 | 1632 return orig; |
| 0 | 1633 } |
|
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|
1634 |
| 111 | 1635 CASE_CONST_ANY: |
| 0 | 1636 case SYMBOL_REF: |
| 1637 case CODE_LABEL: | |
| 1638 case PC: | |
| 1639 case CC0: | |
| 1640 case SCRATCH: | |
| 1641 /* SCRATCH must be shared because they represent distinct values. */ | |
| 1642 return orig; | |
| 1643 case CLOBBER: | |
| 1644 if (REG_P (XEXP (orig, 0)) && HARD_REGISTER_NUM_P (REGNO (XEXP (orig, 0)))) | |
| 1645 return orig; | |
| 1646 break; | |
| 1647 | |
| 1648 case CONST: | |
| 1649 if (shared_const_p (orig)) | |
| 1650 return orig; | |
| 1651 break; | |
| 1652 | |
| 1653 case SUBREG: | |
| 1654 { | |
|
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|
1655 rtx subreg; |
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|
1656 |
|
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|
1657 if (evd->callback) |
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1658 { |
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1659 subreg = evd->callback (orig, evd->regs_active, max_depth, |
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1660 evd->callback_arg); |
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1661 if (subreg != orig) |
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1662 return subreg; |
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1663 } |
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1664 |
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|
1665 subreg = cselib_expand_value_rtx_1 (SUBREG_REG (orig), evd, |
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|
1666 max_depth - 1); |
| 0 | 1667 if (!subreg) |
| 1668 return NULL; | |
| 1669 scopy = simplify_gen_subreg (GET_MODE (orig), subreg, | |
| 1670 GET_MODE (SUBREG_REG (orig)), | |
| 1671 SUBREG_BYTE (orig)); | |
| 1672 if (scopy == NULL | |
| 1673 || (GET_CODE (scopy) == SUBREG | |
| 1674 && !REG_P (SUBREG_REG (scopy)) | |
| 1675 && !MEM_P (SUBREG_REG (scopy)))) | |
|
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1676 return NULL; |
|
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|
1677 |
| 0 | 1678 return scopy; |
| 1679 } | |
| 1680 | |
| 1681 case VALUE: | |
|
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|
1682 { |
|
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|
1683 rtx result; |
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|
1684 |
|
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|
1685 if (dump_file && (dump_flags & TDF_CSELIB)) |
|
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1686 { |
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|
1687 fputs ("\nexpanding ", dump_file); |
|
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|
1688 print_rtl_single (dump_file, orig); |
|
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|
1689 fputs (" into...", dump_file); |
|
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1690 } |
| 0 | 1691 |
|
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|
1692 if (evd->callback) |
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1693 { |
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1694 result = evd->callback (orig, evd->regs_active, max_depth, |
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1695 evd->callback_arg); |
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1696 |
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1697 if (result != orig) |
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1698 return result; |
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1699 } |
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1700 |
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1701 result = expand_loc (CSELIB_VAL_PTR (orig)->locs, evd, max_depth); |
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1702 return result; |
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1703 } |
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1704 |
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1705 case DEBUG_EXPR: |
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1706 if (evd->callback) |
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1707 return evd->callback (orig, evd->regs_active, max_depth, |
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1708 evd->callback_arg); |
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1709 return orig; |
| 0 | 1710 |
| 1711 default: | |
| 1712 break; | |
| 1713 } | |
| 1714 | |
| 1715 /* Copy the various flags, fields, and other information. We assume | |
| 1716 that all fields need copying, and then clear the fields that should | |
| 1717 not be copied. That is the sensible default behavior, and forces | |
| 1718 us to explicitly document why we are *not* copying a flag. */ | |
|
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1719 if (evd->dummy) |
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1720 copy = NULL; |
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1721 else |
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1722 copy = shallow_copy_rtx (orig); |
| 0 | 1723 |
| 1724 format_ptr = GET_RTX_FORMAT (code); | |
| 1725 | |
| 1726 for (i = 0; i < GET_RTX_LENGTH (code); i++) | |
| 1727 switch (*format_ptr++) | |
| 1728 { | |
| 1729 case 'e': | |
| 1730 if (XEXP (orig, i) != NULL) | |
| 1731 { | |
|
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1732 rtx result = cselib_expand_value_rtx_1 (XEXP (orig, i), evd, |
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1733 max_depth - 1); |
| 0 | 1734 if (!result) |
| 1735 return NULL; | |
|
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1736 if (copy) |
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1737 XEXP (copy, i) = result; |
| 0 | 1738 } |
| 1739 break; | |
| 1740 | |
| 1741 case 'E': | |
| 1742 case 'V': | |
| 1743 if (XVEC (orig, i) != NULL) | |
| 1744 { | |
|
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1745 if (copy) |
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1746 XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i)); |
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1747 for (j = 0; j < XVECLEN (orig, i); j++) |
| 0 | 1748 { |
|
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1749 rtx result = cselib_expand_value_rtx_1 (XVECEXP (orig, i, j), |
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1750 evd, max_depth - 1); |
| 0 | 1751 if (!result) |
| 1752 return NULL; | |
|
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1753 if (copy) |
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1754 XVECEXP (copy, i, j) = result; |
| 0 | 1755 } |
| 1756 } | |
| 1757 break; | |
| 1758 | |
| 1759 case 't': | |
| 1760 case 'w': | |
| 1761 case 'i': | |
| 1762 case 's': | |
| 1763 case 'S': | |
| 1764 case 'T': | |
| 1765 case 'u': | |
| 1766 case 'B': | |
| 1767 case '0': | |
| 1768 /* These are left unchanged. */ | |
| 1769 break; | |
| 1770 | |
| 1771 default: | |
| 1772 gcc_unreachable (); | |
| 1773 } | |
| 1774 | |
|
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1775 if (evd->dummy) |
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1776 return orig; |
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1777 |
| 0 | 1778 mode = GET_MODE (copy); |
| 1779 /* If an operand has been simplified into CONST_INT, which doesn't | |
| 1780 have a mode and the mode isn't derivable from whole rtx's mode, | |
| 1781 try simplify_*_operation first with mode from original's operand | |
| 1782 and as a fallback wrap CONST_INT into gen_rtx_CONST. */ | |
| 1783 scopy = copy; | |
| 1784 switch (GET_RTX_CLASS (code)) | |
| 1785 { | |
| 1786 case RTX_UNARY: | |
| 1787 if (CONST_INT_P (XEXP (copy, 0)) | |
| 1788 && GET_MODE (XEXP (orig, 0)) != VOIDmode) | |
| 1789 { | |
| 1790 scopy = simplify_unary_operation (code, mode, XEXP (copy, 0), | |
| 1791 GET_MODE (XEXP (orig, 0))); | |
| 1792 if (scopy) | |
| 1793 return scopy; | |
| 1794 } | |
| 1795 break; | |
| 1796 case RTX_COMM_ARITH: | |
| 1797 case RTX_BIN_ARITH: | |
| 1798 /* These expressions can derive operand modes from the whole rtx's mode. */ | |
| 1799 break; | |
| 1800 case RTX_TERNARY: | |
| 1801 case RTX_BITFIELD_OPS: | |
| 1802 if (CONST_INT_P (XEXP (copy, 0)) | |
| 1803 && GET_MODE (XEXP (orig, 0)) != VOIDmode) | |
| 1804 { | |
| 1805 scopy = simplify_ternary_operation (code, mode, | |
| 1806 GET_MODE (XEXP (orig, 0)), | |
| 1807 XEXP (copy, 0), XEXP (copy, 1), | |
| 1808 XEXP (copy, 2)); | |
| 1809 if (scopy) | |
| 1810 return scopy; | |
| 1811 } | |
| 1812 break; | |
| 1813 case RTX_COMPARE: | |
| 1814 case RTX_COMM_COMPARE: | |
| 1815 if (CONST_INT_P (XEXP (copy, 0)) | |
| 1816 && GET_MODE (XEXP (copy, 1)) == VOIDmode | |
| 1817 && (GET_MODE (XEXP (orig, 0)) != VOIDmode | |
| 1818 || GET_MODE (XEXP (orig, 1)) != VOIDmode)) | |
| 1819 { | |
| 1820 scopy = simplify_relational_operation (code, mode, | |
| 1821 (GET_MODE (XEXP (orig, 0)) | |
| 1822 != VOIDmode) | |
| 1823 ? GET_MODE (XEXP (orig, 0)) | |
| 1824 : GET_MODE (XEXP (orig, 1)), | |
| 1825 XEXP (copy, 0), | |
| 1826 XEXP (copy, 1)); | |
| 1827 if (scopy) | |
| 1828 return scopy; | |
| 1829 } | |
| 1830 break; | |
| 1831 default: | |
| 1832 break; | |
| 1833 } | |
| 1834 scopy = simplify_rtx (copy); | |
| 1835 if (scopy) | |
| 1836 return scopy; | |
| 1837 return copy; | |
| 1838 } | |
| 1839 | |
| 1840 /* Walk rtx X and replace all occurrences of REG and MEM subexpressions | |
| 1841 with VALUE expressions. This way, it becomes independent of changes | |
| 1842 to registers and memory. | |
| 1843 X isn't actually modified; if modifications are needed, new rtl is | |
|
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1844 allocated. However, the return value can share rtl with X. |
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1845 If X is within a MEM, MEMMODE must be the mode of the MEM. */ |
| 0 | 1846 |
| 1847 rtx | |
| 111 | 1848 cselib_subst_to_values (rtx x, machine_mode memmode) |
| 0 | 1849 { |
| 1850 enum rtx_code code = GET_CODE (x); | |
| 1851 const char *fmt = GET_RTX_FORMAT (code); | |
| 1852 cselib_val *e; | |
| 1853 struct elt_list *l; | |
| 1854 rtx copy = x; | |
| 1855 int i; | |
| 1856 | |
| 1857 switch (code) | |
| 1858 { | |
| 1859 case REG: | |
| 1860 l = REG_VALUES (REGNO (x)); | |
| 1861 if (l && l->elt == NULL) | |
| 1862 l = l->next; | |
| 1863 for (; l; l = l->next) | |
| 1864 if (GET_MODE (l->elt->val_rtx) == GET_MODE (x)) | |
| 1865 return l->elt->val_rtx; | |
| 1866 | |
| 1867 gcc_unreachable (); | |
| 1868 | |
| 1869 case MEM: | |
| 1870 e = cselib_lookup_mem (x, 0); | |
|
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1871 /* This used to happen for autoincrements, but we deal with them |
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1872 properly now. Remove the if stmt for the next release. */ |
| 0 | 1873 if (! e) |
| 1874 { | |
|
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1875 /* Assign a value that doesn't match any other. */ |
|
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1876 e = new_cselib_val (next_uid, GET_MODE (x), x); |
| 0 | 1877 } |
| 1878 return e->val_rtx; | |
| 1879 | |
| 111 | 1880 case ENTRY_VALUE: |
| 1881 e = cselib_lookup (x, GET_MODE (x), 0, memmode); | |
| 1882 if (! e) | |
| 1883 break; | |
| 1884 return e->val_rtx; | |
| 1885 | |
| 1886 CASE_CONST_ANY: | |
| 0 | 1887 return x; |
| 1888 | |
|
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1889 case PRE_DEC: |
| 0 | 1890 case PRE_INC: |
|
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1891 gcc_assert (memmode != VOIDmode); |
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1892 i = GET_MODE_SIZE (memmode); |
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1893 if (code == PRE_DEC) |
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1894 i = -i; |
| 111 | 1895 return cselib_subst_to_values (plus_constant (GET_MODE (x), |
| 1896 XEXP (x, 0), i), | |
|
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1897 memmode); |
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1898 |
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1899 case PRE_MODIFY: |
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1900 gcc_assert (memmode != VOIDmode); |
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1901 return cselib_subst_to_values (XEXP (x, 1), memmode); |
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1902 |
| 0 | 1903 case POST_DEC: |
|
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1904 case POST_INC: |
| 0 | 1905 case POST_MODIFY: |
|
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1906 gcc_assert (memmode != VOIDmode); |
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1907 return cselib_subst_to_values (XEXP (x, 0), memmode); |
| 0 | 1908 |
| 1909 default: | |
| 1910 break; | |
| 1911 } | |
| 1912 | |
| 1913 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
| 1914 { | |
| 1915 if (fmt[i] == 'e') | |
| 1916 { | |
|
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1917 rtx t = cselib_subst_to_values (XEXP (x, i), memmode); |
| 0 | 1918 |
|
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1919 if (t != XEXP (x, i)) |
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1920 { |
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1921 if (x == copy) |
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1922 copy = shallow_copy_rtx (x); |
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1923 XEXP (copy, i) = t; |
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1924 } |
| 0 | 1925 } |
| 1926 else if (fmt[i] == 'E') | |
| 1927 { | |
|
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1928 int j; |
| 0 | 1929 |
| 1930 for (j = 0; j < XVECLEN (x, i); j++) | |
| 1931 { | |
|
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1932 rtx t = cselib_subst_to_values (XVECEXP (x, i, j), memmode); |
| 0 | 1933 |
|
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1934 if (t != XVECEXP (x, i, j)) |
| 0 | 1935 { |
|
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1936 if (XVEC (x, i) == XVEC (copy, i)) |
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1937 { |
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1938 if (x == copy) |
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1939 copy = shallow_copy_rtx (x); |
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1940 XVEC (copy, i) = shallow_copy_rtvec (XVEC (x, i)); |
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1941 } |
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1942 XVECEXP (copy, i, j) = t; |
| 0 | 1943 } |
| 1944 } | |
| 1945 } | |
| 1946 } | |
| 1947 | |
| 1948 return copy; | |
| 1949 } | |
| 1950 | |
| 111 | 1951 /* Wrapper for cselib_subst_to_values, that indicates X is in INSN. */ |
| 1952 | |
| 1953 rtx | |
| 1954 cselib_subst_to_values_from_insn (rtx x, machine_mode memmode, rtx_insn *insn) | |
| 1955 { | |
| 1956 rtx ret; | |
| 1957 gcc_assert (!cselib_current_insn); | |
| 1958 cselib_current_insn = insn; | |
| 1959 ret = cselib_subst_to_values (x, memmode); | |
| 1960 cselib_current_insn = NULL; | |
| 1961 return ret; | |
| 1962 } | |
| 1963 | |
|
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1964 /* Look up the rtl expression X in our tables and return the value it |
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1965 has. If CREATE is zero, we return NULL if we don't know the value. |
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1966 Otherwise, we create a new one if possible, using mode MODE if X |
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1967 doesn't have a mode (i.e. because it's a constant). When X is part |
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1968 of an address, MEMMODE should be the mode of the enclosing MEM if |
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1969 we're tracking autoinc expressions. */ |
| 0 | 1970 |
|
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1971 static cselib_val * |
| 111 | 1972 cselib_lookup_1 (rtx x, machine_mode mode, |
| 1973 int create, machine_mode memmode) | |
| 0 | 1974 { |
| 111 | 1975 cselib_val **slot; |
| 0 | 1976 cselib_val *e; |
| 1977 unsigned int hashval; | |
| 1978 | |
| 1979 if (GET_MODE (x) != VOIDmode) | |
| 1980 mode = GET_MODE (x); | |
| 1981 | |
| 1982 if (GET_CODE (x) == VALUE) | |
| 1983 return CSELIB_VAL_PTR (x); | |
| 1984 | |
| 1985 if (REG_P (x)) | |
| 1986 { | |
| 1987 struct elt_list *l; | |
| 1988 unsigned int i = REGNO (x); | |
| 1989 | |
| 1990 l = REG_VALUES (i); | |
| 1991 if (l && l->elt == NULL) | |
| 1992 l = l->next; | |
| 1993 for (; l; l = l->next) | |
| 1994 if (mode == GET_MODE (l->elt->val_rtx)) | |
|
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1995 { |
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1996 promote_debug_loc (l->elt->locs); |
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1997 return l->elt; |
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1998 } |
| 0 | 1999 |
| 2000 if (! create) | |
|
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2001 return 0; |
| 0 | 2002 |
| 2003 if (i < FIRST_PSEUDO_REGISTER) | |
| 2004 { | |
| 111 | 2005 unsigned int n = hard_regno_nregs (i, mode); |
| 0 | 2006 |
| 2007 if (n > max_value_regs) | |
| 2008 max_value_regs = n; | |
| 2009 } | |
| 2010 | |
|
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2011 e = new_cselib_val (next_uid, GET_MODE (x), x); |
| 111 | 2012 new_elt_loc_list (e, x); |
| 2013 | |
| 2014 scalar_int_mode int_mode; | |
| 0 | 2015 if (REG_VALUES (i) == 0) |
| 2016 { | |
| 2017 /* Maintain the invariant that the first entry of | |
| 2018 REG_VALUES, if present, must be the value used to set the | |
| 2019 register, or NULL. */ | |
| 2020 used_regs[n_used_regs++] = i; | |
| 2021 REG_VALUES (i) = new_elt_list (REG_VALUES (i), NULL); | |
| 2022 } | |
| 111 | 2023 else if (cselib_preserve_constants |
| 2024 && is_int_mode (mode, &int_mode)) | |
| 2025 { | |
| 2026 /* During var-tracking, try harder to find equivalences | |
| 2027 for SUBREGs. If a setter sets say a DImode register | |
| 2028 and user uses that register only in SImode, add a lowpart | |
| 2029 subreg location. */ | |
| 2030 struct elt_list *lwider = NULL; | |
| 2031 scalar_int_mode lmode; | |
| 2032 l = REG_VALUES (i); | |
| 2033 if (l && l->elt == NULL) | |
| 2034 l = l->next; | |
| 2035 for (; l; l = l->next) | |
| 2036 if (is_int_mode (GET_MODE (l->elt->val_rtx), &lmode) | |
| 2037 && GET_MODE_SIZE (lmode) > GET_MODE_SIZE (int_mode) | |
| 2038 && (lwider == NULL | |
| 2039 || partial_subreg_p (lmode, | |
| 2040 GET_MODE (lwider->elt->val_rtx)))) | |
| 2041 { | |
| 2042 struct elt_loc_list *el; | |
| 2043 if (i < FIRST_PSEUDO_REGISTER | |
| 2044 && hard_regno_nregs (i, lmode) != 1) | |
| 2045 continue; | |
| 2046 for (el = l->elt->locs; el; el = el->next) | |
| 2047 if (!REG_P (el->loc)) | |
| 2048 break; | |
| 2049 if (el) | |
| 2050 lwider = l; | |
| 2051 } | |
| 2052 if (lwider) | |
| 2053 { | |
| 2054 rtx sub = lowpart_subreg (int_mode, lwider->elt->val_rtx, | |
| 2055 GET_MODE (lwider->elt->val_rtx)); | |
| 2056 if (sub) | |
| 2057 new_elt_loc_list (e, sub); | |
| 2058 } | |
| 2059 } | |
| 0 | 2060 REG_VALUES (i)->next = new_elt_list (REG_VALUES (i)->next, e); |
| 111 | 2061 slot = cselib_find_slot (mode, x, e->hash, INSERT, memmode); |
| 0 | 2062 *slot = e; |
|
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2063 return e; |
| 0 | 2064 } |
| 2065 | |
| 2066 if (MEM_P (x)) | |
|
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2067 return cselib_lookup_mem (x, create); |
| 0 | 2068 |
|
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2069 hashval = cselib_hash_rtx (x, create, memmode); |
| 0 | 2070 /* Can't even create if hashing is not possible. */ |
| 2071 if (! hashval) | |
|
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2072 return 0; |
| 0 | 2073 |
| 111 | 2074 slot = cselib_find_slot (mode, x, hashval, |
|
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2075 create ? INSERT : NO_INSERT, memmode); |
| 0 | 2076 if (slot == 0) |
|
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2077 return 0; |
| 0 | 2078 |
| 2079 e = (cselib_val *) *slot; | |
| 2080 if (e) | |
|
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2081 return e; |
| 0 | 2082 |
|
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2083 e = new_cselib_val (hashval, mode, x); |
| 0 | 2084 |
| 2085 /* We have to fill the slot before calling cselib_subst_to_values: | |
| 2086 the hash table is inconsistent until we do so, and | |
| 2087 cselib_subst_to_values will need to do lookups. */ | |
| 111 | 2088 *slot = e; |
| 2089 new_elt_loc_list (e, cselib_subst_to_values (x, memmode)); | |
|
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2090 return e; |
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2091 } |
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2092 |
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2093 /* Wrapper for cselib_lookup, that indicates X is in INSN. */ |
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2094 |
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2095 cselib_val * |
| 111 | 2096 cselib_lookup_from_insn (rtx x, machine_mode mode, |
| 2097 int create, machine_mode memmode, rtx_insn *insn) | |
|
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2098 { |
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2099 cselib_val *ret; |
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2100 |
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2101 gcc_assert (!cselib_current_insn); |
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2102 cselib_current_insn = insn; |
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2103 |
|
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2104 ret = cselib_lookup (x, mode, create, memmode); |
|
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2105 |
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2106 cselib_current_insn = NULL; |
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2107 |
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2108 return ret; |
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2109 } |
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2110 |
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2111 /* Wrapper for cselib_lookup_1, that logs the lookup result and |
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2112 maintains invariants related with debug insns. */ |
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2113 |
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2114 cselib_val * |
| 111 | 2115 cselib_lookup (rtx x, machine_mode mode, |
| 2116 int create, machine_mode memmode) | |
|
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2117 { |
|
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2118 cselib_val *ret = cselib_lookup_1 (x, mode, create, memmode); |
|
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2119 |
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2120 /* ??? Should we return NULL if we're not to create an entry, the |
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2121 found loc is a debug loc and cselib_current_insn is not DEBUG? |
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2122 If so, we should also avoid converting val to non-DEBUG; probably |
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2123 easiest setting cselib_current_insn to NULL before the call |
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2124 above. */ |
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2125 |
|
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2126 if (dump_file && (dump_flags & TDF_CSELIB)) |
|
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2127 { |
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2128 fputs ("cselib lookup ", dump_file); |
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2129 print_inline_rtx (dump_file, x, 2); |
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2130 fprintf (dump_file, " => %u:%u\n", |
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2131 ret ? ret->uid : 0, |
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2132 ret ? ret->hash : 0); |
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2133 } |
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2134 |
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2135 return ret; |
| 0 | 2136 } |
| 2137 | |
| 2138 /* Invalidate any entries in reg_values that overlap REGNO. This is called | |
| 2139 if REGNO is changing. MODE is the mode of the assignment to REGNO, which | |
| 2140 is used to determine how many hard registers are being changed. If MODE | |
| 2141 is VOIDmode, then only REGNO is being changed; this is used when | |
| 2142 invalidating call clobbered registers across a call. */ | |
| 2143 | |
| 2144 static void | |
| 111 | 2145 cselib_invalidate_regno (unsigned int regno, machine_mode mode) |
| 0 | 2146 { |
| 2147 unsigned int endregno; | |
| 2148 unsigned int i; | |
| 2149 | |
| 2150 /* If we see pseudos after reload, something is _wrong_. */ | |
| 2151 gcc_assert (!reload_completed || regno < FIRST_PSEUDO_REGISTER | |
| 2152 || reg_renumber[regno] < 0); | |
| 2153 | |
| 2154 /* Determine the range of registers that must be invalidated. For | |
| 2155 pseudos, only REGNO is affected. For hard regs, we must take MODE | |
| 2156 into account, and we must also invalidate lower register numbers | |
| 2157 if they contain values that overlap REGNO. */ | |
| 2158 if (regno < FIRST_PSEUDO_REGISTER) | |
| 2159 { | |
| 2160 gcc_assert (mode != VOIDmode); | |
| 2161 | |
| 2162 if (regno < max_value_regs) | |
| 2163 i = 0; | |
| 2164 else | |
| 2165 i = regno - max_value_regs; | |
| 2166 | |
| 2167 endregno = end_hard_regno (mode, regno); | |
| 2168 } | |
| 2169 else | |
| 2170 { | |
| 2171 i = regno; | |
| 2172 endregno = regno + 1; | |
| 2173 } | |
| 2174 | |
| 2175 for (; i < endregno; i++) | |
| 2176 { | |
| 2177 struct elt_list **l = ®_VALUES (i); | |
| 2178 | |
| 2179 /* Go through all known values for this reg; if it overlaps the range | |
| 2180 we're invalidating, remove the value. */ | |
| 2181 while (*l) | |
| 2182 { | |
| 2183 cselib_val *v = (*l)->elt; | |
|
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2184 bool had_locs; |
| 111 | 2185 rtx_insn *setting_insn; |
| 0 | 2186 struct elt_loc_list **p; |
| 2187 unsigned int this_last = i; | |
| 2188 | |
| 2189 if (i < FIRST_PSEUDO_REGISTER && v != NULL) | |
| 2190 this_last = end_hard_regno (GET_MODE (v->val_rtx), i) - 1; | |
| 2191 | |
|
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2192 if (this_last < regno || v == NULL |
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2193 || (v == cfa_base_preserved_val |
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2194 && i == cfa_base_preserved_regno)) |
| 0 | 2195 { |
| 2196 l = &(*l)->next; | |
| 2197 continue; | |
| 2198 } | |
| 2199 | |
| 2200 /* We have an overlap. */ | |
| 2201 if (*l == REG_VALUES (i)) | |
| 2202 { | |
| 2203 /* Maintain the invariant that the first entry of | |
| 2204 REG_VALUES, if present, must be the value used to set | |
| 2205 the register, or NULL. This is also nice because | |
| 2206 then we won't push the same regno onto user_regs | |
| 2207 multiple times. */ | |
| 2208 (*l)->elt = NULL; | |
| 2209 l = &(*l)->next; | |
| 2210 } | |
| 2211 else | |
| 2212 unchain_one_elt_list (l); | |
| 2213 | |
| 111 | 2214 v = canonical_cselib_val (v); |
| 2215 | |
|
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2216 had_locs = v->locs != NULL; |
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2217 setting_insn = v->locs ? v->locs->setting_insn : NULL; |
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2218 |
| 0 | 2219 /* Now, we clear the mapping from value to reg. It must exist, so |
| 2220 this code will crash intentionally if it doesn't. */ | |
| 2221 for (p = &v->locs; ; p = &(*p)->next) | |
| 2222 { | |
| 2223 rtx x = (*p)->loc; | |
| 2224 | |
| 2225 if (REG_P (x) && REGNO (x) == i) | |
| 2226 { | |
| 2227 unchain_one_elt_loc_list (p); | |
| 2228 break; | |
| 2229 } | |
| 2230 } | |
|
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2231 |
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2232 if (had_locs && v->locs == 0 && !PRESERVED_VALUE_P (v->val_rtx)) |
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2233 { |
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2234 if (setting_insn && DEBUG_INSN_P (setting_insn)) |
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2235 n_useless_debug_values++; |
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2236 else |
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2237 n_useless_values++; |
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|
2238 } |
| 0 | 2239 } |
| 2240 } | |
| 2241 } | |
| 2242 | |
| 2243 /* Invalidate any locations in the table which are changed because of a | |
| 2244 store to MEM_RTX. If this is called because of a non-const call | |
| 2245 instruction, MEM_RTX is (mem:BLK const0_rtx). */ | |
| 2246 | |
| 2247 static void | |
| 2248 cselib_invalidate_mem (rtx mem_rtx) | |
| 2249 { | |
| 2250 cselib_val **vp, *v, *next; | |
| 2251 int num_mems = 0; | |
| 2252 rtx mem_addr; | |
| 2253 | |
| 2254 mem_addr = canon_rtx (get_addr (XEXP (mem_rtx, 0))); | |
| 2255 mem_rtx = canon_rtx (mem_rtx); | |
| 2256 | |
| 2257 vp = &first_containing_mem; | |
| 2258 for (v = *vp; v != &dummy_val; v = next) | |
| 2259 { | |
| 2260 bool has_mem = false; | |
| 2261 struct elt_loc_list **p = &v->locs; | |
|
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|
2262 bool had_locs = v->locs != NULL; |
| 111 | 2263 rtx_insn *setting_insn = v->locs ? v->locs->setting_insn : NULL; |
| 0 | 2264 |
| 2265 while (*p) | |
| 2266 { | |
| 2267 rtx x = (*p)->loc; | |
| 2268 cselib_val *addr; | |
| 2269 struct elt_list **mem_chain; | |
| 2270 | |
| 2271 /* MEMs may occur in locations only at the top level; below | |
| 2272 that every MEM or REG is substituted by its VALUE. */ | |
| 2273 if (!MEM_P (x)) | |
| 2274 { | |
| 2275 p = &(*p)->next; | |
| 2276 continue; | |
| 2277 } | |
| 2278 if (num_mems < PARAM_VALUE (PARAM_MAX_CSELIB_MEMORY_LOCATIONS) | |
| 111 | 2279 && ! canon_anti_dependence (x, false, mem_rtx, |
| 2280 GET_MODE (mem_rtx), mem_addr)) | |
| 0 | 2281 { |
| 2282 has_mem = true; | |
| 2283 num_mems++; | |
| 2284 p = &(*p)->next; | |
| 2285 continue; | |
| 2286 } | |
| 2287 | |
| 2288 /* This one overlaps. */ | |
| 2289 /* We must have a mapping from this MEM's address to the | |
| 2290 value (E). Remove that, too. */ | |
|
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|
2291 addr = cselib_lookup (XEXP (x, 0), VOIDmode, 0, GET_MODE (x)); |
| 111 | 2292 addr = canonical_cselib_val (addr); |
| 2293 gcc_checking_assert (v == canonical_cselib_val (v)); | |
| 0 | 2294 mem_chain = &addr->addr_list; |
| 2295 for (;;) | |
| 2296 { | |
| 111 | 2297 cselib_val *canon = canonical_cselib_val ((*mem_chain)->elt); |
| 2298 | |
| 2299 if (canon == v) | |
| 0 | 2300 { |
| 2301 unchain_one_elt_list (mem_chain); | |
| 2302 break; | |
| 2303 } | |
| 2304 | |
| 111 | 2305 /* Record canonicalized elt. */ |
| 2306 (*mem_chain)->elt = canon; | |
| 2307 | |
| 0 | 2308 mem_chain = &(*mem_chain)->next; |
| 2309 } | |
| 2310 | |
| 2311 unchain_one_elt_loc_list (p); | |
| 2312 } | |
| 2313 | |
|
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2314 if (had_locs && v->locs == 0 && !PRESERVED_VALUE_P (v->val_rtx)) |
|
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2315 { |
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2316 if (setting_insn && DEBUG_INSN_P (setting_insn)) |
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2317 n_useless_debug_values++; |
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2318 else |
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2319 n_useless_values++; |
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|
2320 } |
| 0 | 2321 |
| 2322 next = v->next_containing_mem; | |
| 2323 if (has_mem) | |
| 2324 { | |
| 2325 *vp = v; | |
| 2326 vp = &(*vp)->next_containing_mem; | |
| 2327 } | |
| 2328 else | |
| 2329 v->next_containing_mem = NULL; | |
| 2330 } | |
| 2331 *vp = &dummy_val; | |
| 2332 } | |
| 2333 | |
| 2334 /* Invalidate DEST, which is being assigned to or clobbered. */ | |
| 2335 | |
| 2336 void | |
| 2337 cselib_invalidate_rtx (rtx dest) | |
| 2338 { | |
| 2339 while (GET_CODE (dest) == SUBREG | |
| 2340 || GET_CODE (dest) == ZERO_EXTRACT | |
| 2341 || GET_CODE (dest) == STRICT_LOW_PART) | |
| 2342 dest = XEXP (dest, 0); | |
| 2343 | |
| 2344 if (REG_P (dest)) | |
| 2345 cselib_invalidate_regno (REGNO (dest), GET_MODE (dest)); | |
| 2346 else if (MEM_P (dest)) | |
| 2347 cselib_invalidate_mem (dest); | |
| 2348 } | |
| 2349 | |
| 2350 /* A wrapper for cselib_invalidate_rtx to be called via note_stores. */ | |
| 2351 | |
| 2352 static void | |
| 2353 cselib_invalidate_rtx_note_stores (rtx dest, const_rtx ignore ATTRIBUTE_UNUSED, | |
| 2354 void *data ATTRIBUTE_UNUSED) | |
| 2355 { | |
| 2356 cselib_invalidate_rtx (dest); | |
| 2357 } | |
| 2358 | |
| 2359 /* Record the result of a SET instruction. DEST is being set; the source | |
| 2360 contains the value described by SRC_ELT. If DEST is a MEM, DEST_ADDR_ELT | |
| 2361 describes its address. */ | |
| 2362 | |
| 2363 static void | |
| 2364 cselib_record_set (rtx dest, cselib_val *src_elt, cselib_val *dest_addr_elt) | |
| 2365 { | |
| 2366 if (src_elt == 0 || side_effects_p (dest)) | |
| 2367 return; | |
| 2368 | |
| 111 | 2369 if (REG_P (dest)) |
| 0 | 2370 { |
| 111 | 2371 unsigned int dreg = REGNO (dest); |
| 0 | 2372 if (dreg < FIRST_PSEUDO_REGISTER) |
| 2373 { | |
| 111 | 2374 unsigned int n = REG_NREGS (dest); |
| 0 | 2375 |
| 2376 if (n > max_value_regs) | |
| 2377 max_value_regs = n; | |
| 2378 } | |
| 2379 | |
| 2380 if (REG_VALUES (dreg) == 0) | |
| 2381 { | |
| 2382 used_regs[n_used_regs++] = dreg; | |
| 2383 REG_VALUES (dreg) = new_elt_list (REG_VALUES (dreg), src_elt); | |
| 2384 } | |
| 2385 else | |
| 2386 { | |
| 2387 /* The register should have been invalidated. */ | |
| 2388 gcc_assert (REG_VALUES (dreg)->elt == 0); | |
| 2389 REG_VALUES (dreg)->elt = src_elt; | |
| 2390 } | |
| 2391 | |
|
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2392 if (src_elt->locs == 0 && !PRESERVED_VALUE_P (src_elt->val_rtx)) |
| 0 | 2393 n_useless_values--; |
| 111 | 2394 new_elt_loc_list (src_elt, dest); |
| 0 | 2395 } |
| 2396 else if (MEM_P (dest) && dest_addr_elt != 0 | |
| 2397 && cselib_record_memory) | |
| 2398 { | |
|
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2399 if (src_elt->locs == 0 && !PRESERVED_VALUE_P (src_elt->val_rtx)) |
| 0 | 2400 n_useless_values--; |
| 2401 add_mem_for_addr (dest_addr_elt, src_elt, dest); | |
| 2402 } | |
| 2403 } | |
| 2404 | |
| 111 | 2405 /* Make ELT and X's VALUE equivalent to each other at INSN. */ |
| 2406 | |
| 2407 void | |
| 2408 cselib_add_permanent_equiv (cselib_val *elt, rtx x, rtx_insn *insn) | |
| 2409 { | |
| 2410 cselib_val *nelt; | |
| 2411 rtx_insn *save_cselib_current_insn = cselib_current_insn; | |
| 2412 | |
| 2413 gcc_checking_assert (elt); | |
| 2414 gcc_checking_assert (PRESERVED_VALUE_P (elt->val_rtx)); | |
| 2415 gcc_checking_assert (!side_effects_p (x)); | |
| 2416 | |
| 2417 cselib_current_insn = insn; | |
| 2418 | |
| 2419 nelt = cselib_lookup (x, GET_MODE (elt->val_rtx), 1, VOIDmode); | |
| 2420 | |
| 2421 if (nelt != elt) | |
| 2422 { | |
| 2423 cselib_any_perm_equivs = true; | |
| 2424 | |
| 2425 if (!PRESERVED_VALUE_P (nelt->val_rtx)) | |
| 2426 cselib_preserve_value (nelt); | |
| 2427 | |
| 2428 new_elt_loc_list (nelt, elt->val_rtx); | |
| 2429 } | |
| 2430 | |
| 2431 cselib_current_insn = save_cselib_current_insn; | |
| 2432 } | |
| 2433 | |
| 2434 /* Return TRUE if any permanent equivalences have been recorded since | |
| 2435 the table was last initialized. */ | |
| 2436 bool | |
| 2437 cselib_have_permanent_equivalences (void) | |
| 2438 { | |
| 2439 return cselib_any_perm_equivs; | |
| 2440 } | |
| 2441 | |
| 0 | 2442 /* There is no good way to determine how many elements there can be |
| 2443 in a PARALLEL. Since it's fairly cheap, use a really large number. */ | |
| 2444 #define MAX_SETS (FIRST_PSEUDO_REGISTER * 2) | |
| 2445 | |
|
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2446 struct cselib_record_autoinc_data |
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2447 { |
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2448 struct cselib_set *sets; |
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2449 int n_sets; |
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2450 }; |
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2451 |
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2452 /* Callback for for_each_inc_dec. Records in ARG the SETs implied by |
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2453 autoinc RTXs: SRC plus SRCOFF if non-NULL is stored in DEST. */ |
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2454 |
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2455 static int |
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2456 cselib_record_autoinc_cb (rtx mem ATTRIBUTE_UNUSED, rtx op ATTRIBUTE_UNUSED, |
|
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2457 rtx dest, rtx src, rtx srcoff, void *arg) |
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2458 { |
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2459 struct cselib_record_autoinc_data *data; |
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2460 data = (struct cselib_record_autoinc_data *)arg; |
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2461 |
|
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2462 data->sets[data->n_sets].dest = dest; |
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2463 |
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2464 if (srcoff) |
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2465 data->sets[data->n_sets].src = gen_rtx_PLUS (GET_MODE (src), src, srcoff); |
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2466 else |
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2467 data->sets[data->n_sets].src = src; |
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2468 |
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2469 data->n_sets++; |
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2470 |
| 111 | 2471 return 0; |
|
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2472 } |
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2473 |
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2474 /* Record the effects of any sets and autoincs in INSN. */ |
| 0 | 2475 static void |
| 111 | 2476 cselib_record_sets (rtx_insn *insn) |
| 0 | 2477 { |
| 2478 int n_sets = 0; | |
| 2479 int i; | |
|
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2480 struct cselib_set sets[MAX_SETS]; |
| 0 | 2481 rtx body = PATTERN (insn); |
| 2482 rtx cond = 0; | |
|
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2483 int n_sets_before_autoinc; |
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2484 struct cselib_record_autoinc_data data; |
| 0 | 2485 |
| 2486 body = PATTERN (insn); | |
| 2487 if (GET_CODE (body) == COND_EXEC) | |
| 2488 { | |
| 2489 cond = COND_EXEC_TEST (body); | |
| 2490 body = COND_EXEC_CODE (body); | |
| 2491 } | |
| 2492 | |
| 2493 /* Find all sets. */ | |
| 2494 if (GET_CODE (body) == SET) | |
| 2495 { | |
| 2496 sets[0].src = SET_SRC (body); | |
| 2497 sets[0].dest = SET_DEST (body); | |
| 2498 n_sets = 1; | |
| 2499 } | |
| 2500 else if (GET_CODE (body) == PARALLEL) | |
| 2501 { | |
| 2502 /* Look through the PARALLEL and record the values being | |
| 2503 set, if possible. Also handle any CLOBBERs. */ | |
| 2504 for (i = XVECLEN (body, 0) - 1; i >= 0; --i) | |
| 2505 { | |
| 2506 rtx x = XVECEXP (body, 0, i); | |
| 2507 | |
| 2508 if (GET_CODE (x) == SET) | |
| 2509 { | |
| 2510 sets[n_sets].src = SET_SRC (x); | |
| 2511 sets[n_sets].dest = SET_DEST (x); | |
| 2512 n_sets++; | |
| 2513 } | |
| 2514 } | |
| 2515 } | |
| 2516 | |
| 2517 if (n_sets == 1 | |
| 2518 && MEM_P (sets[0].src) | |
| 2519 && !cselib_record_memory | |
| 2520 && MEM_READONLY_P (sets[0].src)) | |
| 2521 { | |
| 2522 rtx note = find_reg_equal_equiv_note (insn); | |
| 2523 | |
| 2524 if (note && CONSTANT_P (XEXP (note, 0))) | |
| 2525 sets[0].src = XEXP (note, 0); | |
| 2526 } | |
| 2527 | |
|
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|
2528 data.sets = sets; |
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2529 data.n_sets = n_sets_before_autoinc = n_sets; |
| 111 | 2530 for_each_inc_dec (PATTERN (insn), cselib_record_autoinc_cb, &data); |
|
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2531 n_sets = data.n_sets; |
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2532 |
| 0 | 2533 /* Look up the values that are read. Do this before invalidating the |
| 2534 locations that are written. */ | |
| 2535 for (i = 0; i < n_sets; i++) | |
| 2536 { | |
| 2537 rtx dest = sets[i].dest; | |
| 2538 | |
| 2539 /* A STRICT_LOW_PART can be ignored; we'll record the equivalence for | |
| 2540 the low part after invalidating any knowledge about larger modes. */ | |
| 2541 if (GET_CODE (sets[i].dest) == STRICT_LOW_PART) | |
| 2542 sets[i].dest = dest = XEXP (dest, 0); | |
| 2543 | |
| 2544 /* We don't know how to record anything but REG or MEM. */ | |
| 2545 if (REG_P (dest) | |
| 2546 || (MEM_P (dest) && cselib_record_memory)) | |
| 2547 { | |
| 2548 rtx src = sets[i].src; | |
| 2549 if (cond) | |
| 2550 src = gen_rtx_IF_THEN_ELSE (GET_MODE (dest), cond, src, dest); | |
|
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2551 sets[i].src_elt = cselib_lookup (src, GET_MODE (dest), 1, VOIDmode); |
| 0 | 2552 if (MEM_P (dest)) |
|
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2553 { |
| 111 | 2554 machine_mode address_mode = get_address_mode (dest); |
|
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2555 |
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2556 sets[i].dest_addr_elt = cselib_lookup (XEXP (dest, 0), |
|
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|
2557 address_mode, 1, |
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2558 GET_MODE (dest)); |
|
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2559 } |
| 0 | 2560 else |
| 2561 sets[i].dest_addr_elt = 0; | |
| 2562 } | |
| 2563 } | |
| 2564 | |
|
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2565 if (cselib_record_sets_hook) |
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2566 cselib_record_sets_hook (insn, sets, n_sets); |
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2567 |
| 0 | 2568 /* Invalidate all locations written by this insn. Note that the elts we |
| 2569 looked up in the previous loop aren't affected, just some of their | |
| 2570 locations may go away. */ | |
| 2571 note_stores (body, cselib_invalidate_rtx_note_stores, NULL); | |
| 2572 | |
|
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2573 for (i = n_sets_before_autoinc; i < n_sets; i++) |
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2574 cselib_invalidate_rtx (sets[i].dest); |
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2575 |
| 0 | 2576 /* If this is an asm, look for duplicate sets. This can happen when the |
| 2577 user uses the same value as an output multiple times. This is valid | |
| 2578 if the outputs are not actually used thereafter. Treat this case as | |
| 2579 if the value isn't actually set. We do this by smashing the destination | |
| 2580 to pc_rtx, so that we won't record the value later. */ | |
| 2581 if (n_sets >= 2 && asm_noperands (body) >= 0) | |
| 2582 { | |
| 2583 for (i = 0; i < n_sets; i++) | |
| 2584 { | |
| 2585 rtx dest = sets[i].dest; | |
| 2586 if (REG_P (dest) || MEM_P (dest)) | |
| 2587 { | |
| 2588 int j; | |
| 2589 for (j = i + 1; j < n_sets; j++) | |
| 2590 if (rtx_equal_p (dest, sets[j].dest)) | |
| 2591 { | |
| 2592 sets[i].dest = pc_rtx; | |
| 2593 sets[j].dest = pc_rtx; | |
| 2594 } | |
| 2595 } | |
| 2596 } | |
| 2597 } | |
| 2598 | |
| 2599 /* Now enter the equivalences in our tables. */ | |
| 2600 for (i = 0; i < n_sets; i++) | |
| 2601 { | |
| 2602 rtx dest = sets[i].dest; | |
| 2603 if (REG_P (dest) | |
| 2604 || (MEM_P (dest) && cselib_record_memory)) | |
| 2605 cselib_record_set (dest, sets[i].src_elt, sets[i].dest_addr_elt); | |
| 2606 } | |
| 2607 } | |
| 2608 | |
| 111 | 2609 /* Return true if INSN in the prologue initializes hard_frame_pointer_rtx. */ |
| 2610 | |
| 2611 bool | |
| 2612 fp_setter_insn (rtx_insn *insn) | |
| 2613 { | |
| 2614 rtx expr, pat = NULL_RTX; | |
| 2615 | |
| 2616 if (!RTX_FRAME_RELATED_P (insn)) | |
| 2617 return false; | |
| 2618 | |
| 2619 expr = find_reg_note (insn, REG_FRAME_RELATED_EXPR, NULL_RTX); | |
| 2620 if (expr) | |
| 2621 pat = XEXP (expr, 0); | |
| 2622 if (!modified_in_p (hard_frame_pointer_rtx, pat ? pat : insn)) | |
| 2623 return false; | |
| 2624 | |
| 2625 /* Don't return true for frame pointer restores in the epilogue. */ | |
| 2626 if (find_reg_note (insn, REG_CFA_RESTORE, hard_frame_pointer_rtx)) | |
| 2627 return false; | |
| 2628 return true; | |
| 2629 } | |
| 2630 | |
| 0 | 2631 /* Record the effects of INSN. */ |
| 2632 | |
| 2633 void | |
| 111 | 2634 cselib_process_insn (rtx_insn *insn) |
| 0 | 2635 { |
| 2636 int i; | |
| 2637 rtx x; | |
| 2638 | |
| 2639 cselib_current_insn = insn; | |
| 2640 | |
| 111 | 2641 /* Forget everything at a CODE_LABEL or a setjmp. */ |
| 2642 if ((LABEL_P (insn) | |
| 2643 || (CALL_P (insn) | |
| 2644 && find_reg_note (insn, REG_SETJMP, NULL))) | |
| 2645 && !cselib_preserve_constants) | |
| 0 | 2646 { |
|
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2647 cselib_reset_table (next_uid); |
| 111 | 2648 cselib_current_insn = NULL; |
| 0 | 2649 return; |
| 2650 } | |
| 2651 | |
| 2652 if (! INSN_P (insn)) | |
| 2653 { | |
| 111 | 2654 cselib_current_insn = NULL; |
| 0 | 2655 return; |
| 2656 } | |
| 2657 | |
| 2658 /* If this is a call instruction, forget anything stored in a | |
| 2659 call clobbered register, or, if this is not a const call, in | |
| 2660 memory. */ | |
| 2661 if (CALL_P (insn)) | |
| 2662 { | |
| 2663 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
| 2664 if (call_used_regs[i] | |
| 2665 || (REG_VALUES (i) && REG_VALUES (i)->elt | |
| 111 | 2666 && (targetm.hard_regno_call_part_clobbered |
| 2667 (i, GET_MODE (REG_VALUES (i)->elt->val_rtx))))) | |
| 0 | 2668 cselib_invalidate_regno (i, reg_raw_mode[i]); |
| 2669 | |
| 2670 /* Since it is not clear how cselib is going to be used, be | |
| 2671 conservative here and treat looping pure or const functions | |
| 2672 as if they were regular functions. */ | |
| 2673 if (RTL_LOOPING_CONST_OR_PURE_CALL_P (insn) | |
| 2674 || !(RTL_CONST_OR_PURE_CALL_P (insn))) | |
| 2675 cselib_invalidate_mem (callmem); | |
| 111 | 2676 else |
| 2677 /* For const/pure calls, invalidate any argument slots because | |
| 2678 they are owned by the callee. */ | |
| 2679 for (x = CALL_INSN_FUNCTION_USAGE (insn); x; x = XEXP (x, 1)) | |
| 2680 if (GET_CODE (XEXP (x, 0)) == USE | |
| 2681 && MEM_P (XEXP (XEXP (x, 0), 0))) | |
| 2682 cselib_invalidate_mem (XEXP (XEXP (x, 0), 0)); | |
| 0 | 2683 } |
| 2684 | |
| 2685 cselib_record_sets (insn); | |
| 2686 | |
| 2687 /* Look for any CLOBBERs in CALL_INSN_FUNCTION_USAGE, but only | |
| 2688 after we have processed the insn. */ | |
| 2689 if (CALL_P (insn)) | |
| 111 | 2690 { |
| 2691 for (x = CALL_INSN_FUNCTION_USAGE (insn); x; x = XEXP (x, 1)) | |
| 2692 if (GET_CODE (XEXP (x, 0)) == CLOBBER) | |
| 2693 cselib_invalidate_rtx (XEXP (XEXP (x, 0), 0)); | |
| 2694 /* Flush evertything on setjmp. */ | |
| 2695 if (cselib_preserve_constants | |
| 2696 && find_reg_note (insn, REG_SETJMP, NULL)) | |
| 2697 { | |
| 2698 cselib_preserve_only_values (); | |
| 2699 cselib_reset_table (next_uid); | |
| 2700 } | |
| 2701 } | |
| 2702 | |
| 2703 /* On setter of the hard frame pointer if frame_pointer_needed, | |
| 2704 invalidate stack_pointer_rtx, so that sp and {,h}fp based | |
| 2705 VALUEs are distinct. */ | |
| 2706 if (reload_completed | |
| 2707 && frame_pointer_needed | |
| 2708 && fp_setter_insn (insn)) | |
| 2709 cselib_invalidate_rtx (stack_pointer_rtx); | |
| 2710 | |
| 2711 cselib_current_insn = NULL; | |
| 0 | 2712 |
| 2713 if (n_useless_values > MAX_USELESS_VALUES | |
| 2714 /* remove_useless_values is linear in the hash table size. Avoid | |
| 2715 quadratic behavior for very large hashtables with very few | |
| 2716 useless elements. */ | |
|
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2717 && ((unsigned int)n_useless_values |
| 111 | 2718 > (cselib_hash_table->elements () - n_debug_values) / 4)) |
| 0 | 2719 remove_useless_values (); |
| 2720 } | |
| 2721 | |
| 2722 /* Initialize cselib for one pass. The caller must also call | |
| 2723 init_alias_analysis. */ | |
| 2724 | |
| 2725 void | |
|
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2726 cselib_init (int record_what) |
| 0 | 2727 { |
|
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2728 cselib_record_memory = record_what & CSELIB_RECORD_MEMORY; |
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2729 cselib_preserve_constants = record_what & CSELIB_PRESERVE_CONSTANTS; |
| 111 | 2730 cselib_any_perm_equivs = false; |
| 0 | 2731 |
| 2732 /* (mem:BLK (scratch)) is a special mechanism to conflict with everything, | |
| 2733 see canon_true_dependence. This is only created once. */ | |
| 2734 if (! callmem) | |
| 2735 callmem = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (VOIDmode)); | |
| 2736 | |
| 2737 cselib_nregs = max_reg_num (); | |
| 2738 | |
| 2739 /* We preserve reg_values to allow expensive clearing of the whole thing. | |
| 2740 Reallocate it however if it happens to be too large. */ | |
| 2741 if (!reg_values || reg_values_size < cselib_nregs | |
| 2742 || (reg_values_size > 10 && reg_values_size > cselib_nregs * 4)) | |
| 2743 { | |
| 111 | 2744 free (reg_values); |
| 0 | 2745 /* Some space for newly emit instructions so we don't end up |
| 2746 reallocating in between passes. */ | |
| 2747 reg_values_size = cselib_nregs + (63 + cselib_nregs) / 16; | |
| 2748 reg_values = XCNEWVEC (struct elt_list *, reg_values_size); | |
| 2749 } | |
| 2750 used_regs = XNEWVEC (unsigned int, cselib_nregs); | |
| 2751 n_used_regs = 0; | |
| 111 | 2752 cselib_hash_table = new hash_table<cselib_hasher> (31); |
| 2753 if (cselib_preserve_constants) | |
| 2754 cselib_preserved_hash_table = new hash_table<cselib_hasher> (31); | |
|
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2755 next_uid = 1; |
| 0 | 2756 } |
| 2757 | |
| 2758 /* Called when the current user is done with cselib. */ | |
| 2759 | |
| 2760 void | |
| 2761 cselib_finish (void) | |
| 2762 { | |
| 111 | 2763 bool preserved = cselib_preserve_constants; |
| 0 | 2764 cselib_discard_hook = NULL; |
|
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2765 cselib_preserve_constants = false; |
| 111 | 2766 cselib_any_perm_equivs = false; |
|
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2767 cfa_base_preserved_val = NULL; |
|
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2768 cfa_base_preserved_regno = INVALID_REGNUM; |
| 111 | 2769 elt_list_pool.release (); |
| 2770 elt_loc_list_pool.release (); | |
| 2771 cselib_val_pool.release (); | |
| 2772 value_pool.release (); | |
| 0 | 2773 cselib_clear_table (); |
| 111 | 2774 delete cselib_hash_table; |
| 2775 cselib_hash_table = NULL; | |
| 2776 if (preserved) | |
| 2777 delete cselib_preserved_hash_table; | |
| 2778 cselib_preserved_hash_table = NULL; | |
| 0 | 2779 free (used_regs); |
| 2780 used_regs = 0; | |
| 2781 n_useless_values = 0; | |
|
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2782 n_useless_debug_values = 0; |
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2783 n_debug_values = 0; |
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diff
changeset
|
2784 next_uid = 0; |
| 0 | 2785 } |
| 2786 | |
| 111 | 2787 /* Dump the cselib_val *X to FILE *OUT. */ |
| 2788 | |
| 2789 int | |
| 2790 dump_cselib_val (cselib_val **x, FILE *out) | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2791 { |
| 111 | 2792 cselib_val *v = *x; |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2793 bool need_lf = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2794 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2795 print_inline_rtx (out, v->val_rtx, 0); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2796 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2797 if (v->locs) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2798 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2799 struct elt_loc_list *l = v->locs; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2800 if (need_lf) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2801 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2802 fputc ('\n', out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2803 need_lf = false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2804 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2805 fputs (" locs:", out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2806 do |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2807 { |
| 111 | 2808 if (l->setting_insn) |
| 2809 fprintf (out, "\n from insn %i ", | |
| 2810 INSN_UID (l->setting_insn)); | |
| 2811 else | |
| 2812 fprintf (out, "\n "); | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2813 print_inline_rtx (out, l->loc, 4); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2814 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2815 while ((l = l->next)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2816 fputc ('\n', out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2817 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2818 else |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2819 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2820 fputs (" no locs", out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2821 need_lf = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2822 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2823 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2824 if (v->addr_list) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2825 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2826 struct elt_list *e = v->addr_list; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2827 if (need_lf) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2828 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2829 fputc ('\n', out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2830 need_lf = false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2831 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2832 fputs (" addr list:", out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2833 do |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2834 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2835 fputs ("\n ", out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2836 print_inline_rtx (out, e->elt->val_rtx, 2); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2837 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2838 while ((e = e->next)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2839 fputc ('\n', out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2840 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2841 else |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2842 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2843 fputs (" no addrs", out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2844 need_lf = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2845 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2846 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2847 if (v->next_containing_mem == &dummy_val) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2848 fputs (" last mem\n", out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2849 else if (v->next_containing_mem) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2850 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2851 fputs (" next mem ", out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2852 print_inline_rtx (out, v->next_containing_mem->val_rtx, 2); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2853 fputc ('\n', out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2854 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2855 else if (need_lf) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2856 fputc ('\n', out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2857 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2858 return 1; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2859 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2860 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2861 /* Dump to OUT everything in the CSELIB table. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2862 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2863 void |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2864 dump_cselib_table (FILE *out) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2865 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2866 fprintf (out, "cselib hash table:\n"); |
| 111 | 2867 cselib_hash_table->traverse <FILE *, dump_cselib_val> (out); |
| 2868 fprintf (out, "cselib preserved hash table:\n"); | |
| 2869 cselib_preserved_hash_table->traverse <FILE *, dump_cselib_val> (out); | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2870 if (first_containing_mem != &dummy_val) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2871 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2872 fputs ("first mem ", out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2873 print_inline_rtx (out, first_containing_mem->val_rtx, 2); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2874 fputc ('\n', out); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2875 } |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
2876 fprintf (out, "next uid %i\n", next_uid); |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2877 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
2878 |
| 0 | 2879 #include "gt-cselib.h" |