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annotate gcc/tree-ssa-phiprop.c @ 141:ce508c72660f
copy cbc flang in cfgexpand
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Thu, 22 Nov 2018 19:44:39 +0900 |
parents | 84e7813d76e9 |
children | 1830386684a0 |
rev | line source |
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0 | 1 /* Backward propagation of indirect loads through PHIs. |
131 | 2 Copyright (C) 2007-2018 Free Software Foundation, Inc. |
0 | 3 Contributed by Richard Guenther <rguenther@suse.de> |
4 | |
5 This file is part of GCC. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify | |
8 it under the terms of the GNU General Public License as published by | |
9 the Free Software Foundation; either version 3, or (at your option) | |
10 any later version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, | |
13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 GNU General Public License for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 #include "config.h" | |
22 #include "system.h" | |
23 #include "coretypes.h" | |
111 | 24 #include "backend.h" |
0 | 25 #include "tree.h" |
111 | 26 #include "gimple.h" |
27 #include "tree-pass.h" | |
28 #include "ssa.h" | |
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29 #include "gimple-pretty-print.h" |
111 | 30 #include "fold-const.h" |
31 #include "tree-eh.h" | |
32 #include "gimplify.h" | |
33 #include "gimple-iterator.h" | |
34 #include "stor-layout.h" | |
35 #include "tree-ssa-loop.h" | |
0 | 36 |
37 /* This pass propagates indirect loads through the PHI node for its | |
38 address to make the load source possibly non-addressable and to | |
39 allow for PHI optimization to trigger. | |
40 | |
41 For example the pass changes | |
42 | |
43 # addr_1 = PHI <&a, &b> | |
44 tmp_1 = *addr_1; | |
45 | |
46 to | |
47 | |
48 # tmp_1 = PHI <a, b> | |
49 | |
50 but also handles more complex scenarios like | |
51 | |
52 D.2077_2 = &this_1(D)->a1; | |
53 ... | |
54 | |
55 # b_12 = PHI <&c(2), D.2077_2(3)> | |
56 D.2114_13 = *b_12; | |
57 ... | |
58 | |
59 # b_15 = PHI <b_12(4), &b(5)> | |
60 D.2080_5 = &this_1(D)->a0; | |
61 ... | |
62 | |
63 # b_18 = PHI <D.2080_5(6), &c(7)> | |
64 ... | |
65 | |
66 # b_21 = PHI <b_15(8), b_18(9)> | |
67 D.2076_8 = *b_21; | |
68 | |
69 where the addresses loaded are defined by PHIs itself. | |
70 The above happens for | |
71 | |
72 std::max(std::min(a0, c), std::min(std::max(a1, c), b)) | |
73 | |
74 where this pass transforms it to a form later PHI optimization | |
75 recognizes and transforms it to the simple | |
76 | |
77 D.2109_10 = this_1(D)->a1; | |
78 D.2110_11 = c; | |
79 D.2114_31 = MAX_EXPR <D.2109_10, D.2110_11>; | |
80 D.2115_14 = b; | |
81 D.2125_17 = MIN_EXPR <D.2115_14, D.2114_31>; | |
82 D.2119_16 = this_1(D)->a0; | |
83 D.2124_32 = MIN_EXPR <D.2110_11, D.2119_16>; | |
84 D.2076_33 = MAX_EXPR <D.2125_17, D.2124_32>; | |
85 | |
86 The pass does a dominator walk processing loads using a basic-block | |
87 local analysis and stores the result for use by transformations on | |
88 dominated basic-blocks. */ | |
89 | |
90 | |
91 /* Structure to keep track of the value of a dereferenced PHI result | |
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92 and the virtual operand used for that dereference. */ |
0 | 93 |
94 struct phiprop_d | |
95 { | |
96 tree value; | |
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97 tree vuse; |
0 | 98 }; |
99 | |
100 /* Verify if the value recorded for NAME in PHIVN is still valid at | |
101 the start of basic block BB. */ | |
102 | |
103 static bool | |
104 phivn_valid_p (struct phiprop_d *phivn, tree name, basic_block bb) | |
105 { | |
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106 tree vuse = phivn[SSA_NAME_VERSION (name)].vuse; |
111 | 107 gimple *use_stmt; |
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108 imm_use_iterator ui2; |
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109 bool ok = true; |
0 | 110 |
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111 /* The def stmts of the virtual uses need to be dominated by bb. */ |
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112 gcc_assert (vuse != NULL_TREE); |
0 | 113 |
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114 FOR_EACH_IMM_USE_STMT (use_stmt, ui2, vuse) |
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115 { |
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116 /* If BB does not dominate a VDEF, the value is invalid. */ |
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117 if ((gimple_vdef (use_stmt) != NULL_TREE |
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118 || gimple_code (use_stmt) == GIMPLE_PHI) |
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119 && !dominated_by_p (CDI_DOMINATORS, gimple_bb (use_stmt), bb)) |
0 | 120 { |
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121 ok = false; |
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122 BREAK_FROM_IMM_USE_STMT (ui2); |
0 | 123 } |
124 } | |
125 | |
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126 return ok; |
0 | 127 } |
128 | |
129 /* Insert a new phi node for the dereference of PHI at basic_block | |
130 BB with the virtual operands from USE_STMT. */ | |
131 | |
132 static tree | |
111 | 133 phiprop_insert_phi (basic_block bb, gphi *phi, gimple *use_stmt, |
0 | 134 struct phiprop_d *phivn, size_t n) |
135 { | |
136 tree res; | |
111 | 137 gphi *new_phi = NULL; |
0 | 138 edge_iterator ei; |
139 edge e; | |
140 | |
141 gcc_assert (is_gimple_assign (use_stmt) | |
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142 && gimple_assign_rhs_code (use_stmt) == MEM_REF); |
0 | 143 |
144 /* Build a new PHI node to replace the definition of | |
145 the indirect reference lhs. */ | |
146 res = gimple_assign_lhs (use_stmt); | |
111 | 147 if (TREE_CODE (res) == SSA_NAME) |
148 new_phi = create_phi_node (res, bb); | |
0 | 149 |
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150 if (dump_file && (dump_flags & TDF_DETAILS)) |
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151 { |
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152 fprintf (dump_file, "Inserting PHI for result of load "); |
111 | 153 print_gimple_stmt (dump_file, use_stmt, 0); |
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154 } |
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155 |
0 | 156 /* Add PHI arguments for each edge inserting loads of the |
157 addressable operands. */ | |
158 FOR_EACH_EDGE (e, ei, bb->preds) | |
159 { | |
160 tree old_arg, new_var; | |
111 | 161 gassign *tmp; |
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162 source_location locus; |
0 | 163 |
164 old_arg = PHI_ARG_DEF_FROM_EDGE (phi, e); | |
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165 locus = gimple_phi_arg_location_from_edge (phi, e); |
0 | 166 while (TREE_CODE (old_arg) == SSA_NAME |
167 && (SSA_NAME_VERSION (old_arg) >= n | |
168 || phivn[SSA_NAME_VERSION (old_arg)].value == NULL_TREE)) | |
169 { | |
111 | 170 gimple *def_stmt = SSA_NAME_DEF_STMT (old_arg); |
0 | 171 old_arg = gimple_assign_rhs1 (def_stmt); |
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172 locus = gimple_location (def_stmt); |
0 | 173 } |
174 | |
175 if (TREE_CODE (old_arg) == SSA_NAME) | |
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176 { |
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177 if (dump_file && (dump_flags & TDF_DETAILS)) |
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178 { |
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179 fprintf (dump_file, " for edge defining "); |
111 | 180 print_generic_expr (dump_file, PHI_ARG_DEF_FROM_EDGE (phi, e)); |
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181 fprintf (dump_file, " reusing PHI result "); |
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182 print_generic_expr (dump_file, |
111 | 183 phivn[SSA_NAME_VERSION (old_arg)].value); |
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184 fprintf (dump_file, "\n"); |
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185 } |
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186 /* Reuse a formerly created dereference. */ |
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187 new_var = phivn[SSA_NAME_VERSION (old_arg)].value; |
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188 } |
0 | 189 else |
190 { | |
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191 tree rhs = gimple_assign_rhs1 (use_stmt); |
0 | 192 gcc_assert (TREE_CODE (old_arg) == ADDR_EXPR); |
111 | 193 if (TREE_CODE (res) == SSA_NAME) |
194 new_var = make_ssa_name (TREE_TYPE (rhs)); | |
195 else | |
196 new_var = unshare_expr (res); | |
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197 if (!is_gimple_min_invariant (old_arg)) |
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198 old_arg = PHI_ARG_DEF_FROM_EDGE (phi, e); |
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199 else |
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200 old_arg = unshare_expr (old_arg); |
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201 tmp = gimple_build_assign (new_var, |
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202 fold_build2 (MEM_REF, TREE_TYPE (rhs), |
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203 old_arg, |
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204 TREE_OPERAND (rhs, 1))); |
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205 gimple_set_location (tmp, locus); |
0 | 206 |
207 gsi_insert_on_edge (e, tmp); | |
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208 update_stmt (tmp); |
0 | 209 |
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210 if (dump_file && (dump_flags & TDF_DETAILS)) |
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211 { |
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212 fprintf (dump_file, " for edge defining "); |
111 | 213 print_generic_expr (dump_file, PHI_ARG_DEF_FROM_EDGE (phi, e)); |
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214 fprintf (dump_file, " inserting load "); |
111 | 215 print_gimple_stmt (dump_file, tmp, 0); |
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216 } |
0 | 217 } |
218 | |
111 | 219 if (new_phi) |
220 add_phi_arg (new_phi, new_var, e, locus); | |
221 } | |
222 | |
223 if (new_phi) | |
224 { | |
225 update_stmt (new_phi); | |
226 | |
227 if (dump_file && (dump_flags & TDF_DETAILS)) | |
228 print_gimple_stmt (dump_file, new_phi, 0); | |
0 | 229 } |
230 | |
111 | 231 return res; |
232 } | |
233 | |
234 /* Verify if *idx is available at *DATA. */ | |
0 | 235 |
111 | 236 static bool |
237 chk_uses (tree, tree *idx, void *data) | |
238 { | |
239 basic_block dom = (basic_block) data; | |
240 if (TREE_CODE (*idx) == SSA_NAME) | |
241 return (SSA_NAME_IS_DEFAULT_DEF (*idx) | |
242 || ! dominated_by_p (CDI_DOMINATORS, | |
243 gimple_bb (SSA_NAME_DEF_STMT (*idx)), dom)); | |
244 return true; | |
0 | 245 } |
246 | |
247 /* Propagate between the phi node arguments of PHI in BB and phi result | |
248 users. For now this matches | |
249 # p_2 = PHI <&x, &y> | |
250 <Lx>:; | |
251 p_3 = p_2; | |
252 z_2 = *p_3; | |
253 and converts it to | |
254 # z_2 = PHI <x, y> | |
255 <Lx>:; | |
256 Returns true if a transformation was done and edge insertions | |
257 need to be committed. Global data PHIVN and N is used to track | |
258 past transformation results. We need to be especially careful here | |
259 with aliasing issues as we are moving memory reads. */ | |
260 | |
261 static bool | |
111 | 262 propagate_with_phi (basic_block bb, gphi *phi, struct phiprop_d *phivn, |
0 | 263 size_t n) |
264 { | |
265 tree ptr = PHI_RESULT (phi); | |
111 | 266 gimple *use_stmt; |
0 | 267 tree res = NULL_TREE; |
268 gimple_stmt_iterator gsi; | |
269 imm_use_iterator ui; | |
270 use_operand_p arg_p, use; | |
271 ssa_op_iter i; | |
272 bool phi_inserted; | |
131 | 273 bool changed; |
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274 tree type = NULL_TREE; |
0 | 275 |
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276 if (!POINTER_TYPE_P (TREE_TYPE (ptr)) |
111 | 277 || (!is_gimple_reg_type (TREE_TYPE (TREE_TYPE (ptr))) |
278 && TYPE_MODE (TREE_TYPE (TREE_TYPE (ptr))) == BLKmode)) | |
0 | 279 return false; |
280 | |
281 /* Check if we can "cheaply" dereference all phi arguments. */ | |
282 FOR_EACH_PHI_ARG (arg_p, phi, i, SSA_OP_USE) | |
283 { | |
284 tree arg = USE_FROM_PTR (arg_p); | |
285 /* Walk the ssa chain until we reach a ssa name we already | |
286 created a value for or we reach a definition of the form | |
287 ssa_name_n = &var; */ | |
288 while (TREE_CODE (arg) == SSA_NAME | |
289 && !SSA_NAME_IS_DEFAULT_DEF (arg) | |
290 && (SSA_NAME_VERSION (arg) >= n | |
291 || phivn[SSA_NAME_VERSION (arg)].value == NULL_TREE)) | |
292 { | |
111 | 293 gimple *def_stmt = SSA_NAME_DEF_STMT (arg); |
0 | 294 if (!gimple_assign_single_p (def_stmt)) |
295 return false; | |
296 arg = gimple_assign_rhs1 (def_stmt); | |
297 } | |
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298 if (TREE_CODE (arg) != ADDR_EXPR |
0 | 299 && !(TREE_CODE (arg) == SSA_NAME |
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300 && SSA_NAME_VERSION (arg) < n |
0 | 301 && phivn[SSA_NAME_VERSION (arg)].value != NULL_TREE |
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302 && (!type |
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303 || types_compatible_p |
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304 (type, TREE_TYPE (phivn[SSA_NAME_VERSION (arg)].value))) |
0 | 305 && phivn_valid_p (phivn, arg, bb))) |
306 return false; | |
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307 if (!type |
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308 && TREE_CODE (arg) == SSA_NAME) |
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309 type = TREE_TYPE (phivn[SSA_NAME_VERSION (arg)].value); |
0 | 310 } |
311 | |
312 /* Find a dereferencing use. First follow (single use) ssa | |
313 copy chains for ptr. */ | |
314 while (single_imm_use (ptr, &use, &use_stmt) | |
315 && gimple_assign_ssa_name_copy_p (use_stmt)) | |
316 ptr = gimple_assign_lhs (use_stmt); | |
317 | |
318 /* Replace the first dereference of *ptr if there is one and if we | |
319 can move the loads to the place of the ptr phi node. */ | |
320 phi_inserted = false; | |
131 | 321 changed = false; |
0 | 322 FOR_EACH_IMM_USE_STMT (use_stmt, ui, ptr) |
323 { | |
111 | 324 gimple *def_stmt; |
0 | 325 tree vuse; |
326 | |
111 | 327 /* Only replace loads in blocks that post-dominate the PHI node. That |
328 makes sure we don't end up speculating loads. */ | |
329 if (!dominated_by_p (CDI_POST_DOMINATORS, | |
330 bb, gimple_bb (use_stmt))) | |
331 continue; | |
332 | |
0 | 333 /* Check whether this is a load of *ptr. */ |
334 if (!(is_gimple_assign (use_stmt) | |
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335 && gimple_assign_rhs_code (use_stmt) == MEM_REF |
0 | 336 && TREE_OPERAND (gimple_assign_rhs1 (use_stmt), 0) == ptr |
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337 && integer_zerop (TREE_OPERAND (gimple_assign_rhs1 (use_stmt), 1)) |
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338 && (!type |
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339 || types_compatible_p |
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340 (TREE_TYPE (gimple_assign_lhs (use_stmt)), type)) |
0 | 341 /* We cannot replace a load that may throw or is volatile. */ |
131 | 342 && !stmt_can_throw_internal (cfun, use_stmt))) |
0 | 343 continue; |
344 | |
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345 /* Check if we can move the loads. The def stmt of the virtual use |
111 | 346 needs to be in a different basic block dominating bb. When the |
347 def is an edge-inserted one we know it dominates us. */ | |
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348 vuse = gimple_vuse (use_stmt); |
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349 def_stmt = SSA_NAME_DEF_STMT (vuse); |
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350 if (!SSA_NAME_IS_DEFAULT_DEF (vuse) |
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351 && (gimple_bb (def_stmt) == bb |
111 | 352 || (gimple_bb (def_stmt) |
353 && !dominated_by_p (CDI_DOMINATORS, | |
354 bb, gimple_bb (def_stmt))))) | |
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355 goto next; |
0 | 356 |
111 | 357 /* Found a proper dereference with an aggregate copy. Just |
358 insert aggregate copies on the edges instead. */ | |
131 | 359 if (!is_gimple_reg_type (TREE_TYPE (gimple_assign_lhs (use_stmt)))) |
111 | 360 { |
361 if (!gimple_vdef (use_stmt)) | |
362 goto next; | |
363 | |
364 /* As we replicate the lhs on each incoming edge all | |
365 used SSA names have to be available there. */ | |
366 if (! for_each_index (gimple_assign_lhs_ptr (use_stmt), | |
367 chk_uses, | |
368 get_immediate_dominator (CDI_DOMINATORS, | |
369 gimple_bb (phi)))) | |
370 goto next; | |
371 | |
372 gimple *vuse_stmt; | |
373 imm_use_iterator vui; | |
374 use_operand_p vuse_p; | |
375 /* In order to move the aggregate copies earlier, make sure | |
376 there are no statements that could read from memory | |
377 aliasing the lhs in between the start of bb and use_stmt. | |
378 As we require use_stmt to have a VDEF above, loads after | |
379 use_stmt will use a different virtual SSA_NAME. */ | |
380 FOR_EACH_IMM_USE_FAST (vuse_p, vui, vuse) | |
381 { | |
382 vuse_stmt = USE_STMT (vuse_p); | |
383 if (vuse_stmt == use_stmt) | |
384 continue; | |
385 if (!dominated_by_p (CDI_DOMINATORS, | |
386 gimple_bb (vuse_stmt), bb)) | |
387 continue; | |
388 if (ref_maybe_used_by_stmt_p (vuse_stmt, | |
389 gimple_assign_lhs (use_stmt))) | |
390 goto next; | |
391 } | |
392 | |
393 phiprop_insert_phi (bb, phi, use_stmt, phivn, n); | |
394 | |
395 /* Remove old stmt. The phi is taken care of by DCE. */ | |
396 gsi = gsi_for_stmt (use_stmt); | |
397 /* Unlinking the VDEF here is fine as we are sure that we process | |
398 stmts in execution order due to aggregate copies having VDEFs | |
399 and we emit loads on the edges in the very same order. | |
400 We get multiple copies (or intermediate register loads) handled | |
401 only by walking PHIs or immediate uses in a lucky order though, | |
402 so we could signal the caller to re-start iterating over PHIs | |
403 when we come here which would make it quadratic in the number | |
404 of PHIs. */ | |
405 unlink_stmt_vdef (use_stmt); | |
406 gsi_remove (&gsi, true); | |
407 | |
131 | 408 changed = true; |
111 | 409 } |
410 | |
0 | 411 /* Found a proper dereference. Insert a phi node if this |
412 is the first load transformation. */ | |
111 | 413 else if (!phi_inserted) |
0 | 414 { |
415 res = phiprop_insert_phi (bb, phi, use_stmt, phivn, n); | |
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416 type = TREE_TYPE (res); |
0 | 417 |
418 /* Remember the value we created for *ptr. */ | |
419 phivn[SSA_NAME_VERSION (ptr)].value = res; | |
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420 phivn[SSA_NAME_VERSION (ptr)].vuse = vuse; |
0 | 421 |
422 /* Remove old stmt. The phi is taken care of by DCE, if we | |
423 want to delete it here we also have to delete all intermediate | |
424 copies. */ | |
425 gsi = gsi_for_stmt (use_stmt); | |
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426 gsi_remove (&gsi, true); |
0 | 427 |
428 phi_inserted = true; | |
131 | 429 changed = true; |
0 | 430 } |
431 else | |
432 { | |
433 /* Further replacements are easy, just make a copy out of the | |
434 load. */ | |
435 gimple_assign_set_rhs1 (use_stmt, res); | |
436 update_stmt (use_stmt); | |
131 | 437 changed = true; |
0 | 438 } |
439 | |
440 next:; | |
441 /* Continue searching for a proper dereference. */ | |
442 } | |
443 | |
131 | 444 return changed; |
0 | 445 } |
446 | |
447 /* Main entry for phiprop pass. */ | |
448 | |
111 | 449 namespace { |
450 | |
451 const pass_data pass_data_phiprop = | |
0 | 452 { |
111 | 453 GIMPLE_PASS, /* type */ |
454 "phiprop", /* name */ | |
455 OPTGROUP_NONE, /* optinfo_flags */ | |
456 TV_TREE_PHIPROP, /* tv_id */ | |
457 ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
458 0, /* properties_provided */ | |
459 0, /* properties_destroyed */ | |
460 0, /* todo_flags_start */ | |
461 TODO_update_ssa, /* todo_flags_finish */ | |
462 }; | |
463 | |
464 class pass_phiprop : public gimple_opt_pass | |
465 { | |
466 public: | |
467 pass_phiprop (gcc::context *ctxt) | |
468 : gimple_opt_pass (pass_data_phiprop, ctxt) | |
469 {} | |
470 | |
471 /* opt_pass methods: */ | |
472 virtual bool gate (function *) { return flag_tree_phiprop; } | |
473 virtual unsigned int execute (function *); | |
474 | |
475 }; // class pass_phiprop | |
476 | |
477 unsigned int | |
478 pass_phiprop::execute (function *fun) | |
479 { | |
480 vec<basic_block> bbs; | |
0 | 481 struct phiprop_d *phivn; |
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482 bool did_something = false; |
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483 basic_block bb; |
111 | 484 gphi_iterator gsi; |
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485 unsigned i; |
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486 size_t n; |
0 | 487 |
488 calculate_dominance_info (CDI_DOMINATORS); | |
111 | 489 calculate_dominance_info (CDI_POST_DOMINATORS); |
0 | 490 |
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491 n = num_ssa_names; |
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492 phivn = XCNEWVEC (struct phiprop_d, n); |
0 | 493 |
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494 /* Walk the dominator tree in preorder. */ |
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495 bbs = get_all_dominated_blocks (CDI_DOMINATORS, |
111 | 496 single_succ (ENTRY_BLOCK_PTR_FOR_FN (fun))); |
497 FOR_EACH_VEC_ELT (bbs, i, bb) | |
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498 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
111 | 499 did_something |= propagate_with_phi (bb, gsi.phi (), phivn, n); |
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500 |
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501 if (did_something) |
0 | 502 gsi_commit_edge_inserts (); |
503 | |
111 | 504 bbs.release (); |
0 | 505 free (phivn); |
506 | |
111 | 507 free_dominance_info (CDI_POST_DOMINATORS); |
508 | |
0 | 509 return 0; |
510 } | |
511 | |
111 | 512 } // anon namespace |
0 | 513 |
111 | 514 gimple_opt_pass * |
515 make_pass_phiprop (gcc::context *ctxt) | |
0 | 516 { |
111 | 517 return new pass_phiprop (ctxt); |
518 } |