Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-vectorizer.c @ 55:77e2b8dfacca gcc-4.4.5
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| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | a06113de4d67 |
| children | b7f97abdc517 |
| rev | line source |
|---|---|
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1 /* Vectorizer |
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2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software |
| 0 | 3 Foundation, Inc. |
| 4 Contributed by Dorit Naishlos <dorit@il.ibm.com> | |
| 5 | |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify it under | |
| 9 the terms of the GNU General Public License as published by the Free | |
| 10 Software Foundation; either version 3, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
|
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22 /* Loop and basic block vectorizer. |
| 0 | 23 |
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24 This file contains drivers for the three vectorizers: |
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25 (1) loop vectorizer (inter-iteration parallelism), |
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26 (2) loop-aware SLP (intra-iteration parallelism) (invoked by the loop |
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27 vectorizer) |
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28 (3) BB vectorizer (out-of-loops), aka SLP |
| 0 | 29 |
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30 The rest of the vectorizer's code is organized as follows: |
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31 - tree-vect-loop.c - loop specific parts such as reductions, etc. These are |
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32 used by drivers (1) and (2). |
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33 - tree-vect-loop-manip.c - vectorizer's loop control-flow utilities, used by |
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34 drivers (1) and (2). |
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35 - tree-vect-slp.c - BB vectorization specific analysis and transformation, |
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36 used by drivers (2) and (3). |
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37 - tree-vect-stmts.c - statements analysis and transformation (used by all). |
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38 - tree-vect-data-refs.c - vectorizer specific data-refs analysis and |
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39 manipulations (used by all). |
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40 - tree-vect-patterns.c - vectorizable code patterns detector (used by all) |
| 0 | 41 |
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42 Here's a poor attempt at illustrating that: |
| 0 | 43 |
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44 tree-vectorizer.c: |
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45 loop_vect() loop_aware_slp() slp_vect() |
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46 | / \ / |
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47 | / \ / |
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48 tree-vect-loop.c tree-vect-slp.c |
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49 | \ \ / / | |
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50 | \ \/ / | |
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51 | \ /\ / | |
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52 | \ / \ / | |
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53 tree-vect-stmts.c tree-vect-data-refs.c |
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54 \ / |
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55 tree-vect-patterns.c |
| 0 | 56 */ |
| 57 | |
| 58 #include "config.h" | |
| 59 #include "system.h" | |
| 60 #include "coretypes.h" | |
| 61 #include "tm.h" | |
| 62 #include "ggc.h" | |
| 63 #include "tree.h" | |
| 64 #include "diagnostic.h" | |
| 65 #include "tree-flow.h" | |
| 66 #include "tree-dump.h" | |
| 67 #include "cfgloop.h" | |
| 68 #include "cfglayout.h" | |
| 69 #include "tree-vectorizer.h" | |
| 70 #include "tree-pass.h" | |
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71 #include "timevar.h" |
| 0 | 72 |
| 73 /* vect_dump will be set to stderr or dump_file if exist. */ | |
| 74 FILE *vect_dump; | |
| 75 | |
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76 /* vect_verbosity_level set to an invalid value |
| 0 | 77 to mark that it's uninitialized. */ |
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78 static enum verbosity_levels vect_verbosity_level = MAX_VERBOSITY_LEVEL; |
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79 static enum verbosity_levels user_vect_verbosity_level = MAX_VERBOSITY_LEVEL; |
| 0 | 80 |
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81 /* Loop or bb location. */ |
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82 LOC vect_location; |
| 0 | 83 |
| 84 /* Vector mapping GIMPLE stmt to stmt_vec_info. */ | |
| 85 VEC(vec_void_p,heap) *stmt_vec_info_vec; | |
| 86 | |
| 87 | |
| 88 | |
| 89 /* Function vect_set_verbosity_level. | |
| 90 | |
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91 Called from opts.c upon detection of the |
| 0 | 92 -ftree-vectorizer-verbose=N option. */ |
| 93 | |
| 94 void | |
| 95 vect_set_verbosity_level (const char *val) | |
| 96 { | |
| 97 unsigned int vl; | |
| 98 | |
| 99 vl = atoi (val); | |
| 100 if (vl < MAX_VERBOSITY_LEVEL) | |
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101 user_vect_verbosity_level = (enum verbosity_levels) vl; |
| 0 | 102 else |
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103 user_vect_verbosity_level |
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104 = (enum verbosity_levels) (MAX_VERBOSITY_LEVEL - 1); |
| 0 | 105 } |
| 106 | |
| 107 | |
| 108 /* Function vect_set_dump_settings. | |
| 109 | |
| 110 Fix the verbosity level of the vectorizer if the | |
| 111 requested level was not set explicitly using the flag | |
| 112 -ftree-vectorizer-verbose=N. | |
| 113 Decide where to print the debugging information (dump_file/stderr). | |
| 114 If the user defined the verbosity level, but there is no dump file, | |
| 115 print to stderr, otherwise print to the dump file. */ | |
| 116 | |
| 117 static void | |
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118 vect_set_dump_settings (bool slp) |
| 0 | 119 { |
| 120 vect_dump = dump_file; | |
| 121 | |
| 122 /* Check if the verbosity level was defined by the user: */ | |
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123 if (user_vect_verbosity_level != MAX_VERBOSITY_LEVEL) |
| 0 | 124 { |
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125 vect_verbosity_level = user_vect_verbosity_level; |
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126 /* Ignore user defined verbosity if dump flags require higher level of |
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127 verbosity. */ |
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128 if (dump_file) |
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129 { |
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130 if (((dump_flags & TDF_DETAILS) |
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131 && vect_verbosity_level >= REPORT_DETAILS) |
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132 || ((dump_flags & TDF_STATS) |
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133 && vect_verbosity_level >= REPORT_UNVECTORIZED_LOCATIONS)) |
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134 return; |
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135 } |
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136 else |
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137 { |
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138 /* If there is no dump file, print to stderr in case of loop |
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139 vectorization. */ |
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140 if (!slp) |
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141 vect_dump = stderr; |
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142 |
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143 return; |
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144 } |
| 0 | 145 } |
| 146 | |
| 147 /* User didn't specify verbosity level: */ | |
| 148 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 149 vect_verbosity_level = REPORT_DETAILS; | |
| 150 else if (dump_file && (dump_flags & TDF_STATS)) | |
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151 vect_verbosity_level = REPORT_UNVECTORIZED_LOCATIONS; |
| 0 | 152 else |
| 153 vect_verbosity_level = REPORT_NONE; | |
| 154 | |
| 155 gcc_assert (dump_file || vect_verbosity_level == REPORT_NONE); | |
| 156 } | |
| 157 | |
| 158 | |
| 159 /* Function debug_loop_details. | |
| 160 | |
| 161 For vectorization debug dumps. */ | |
| 162 | |
| 163 bool | |
| 164 vect_print_dump_info (enum verbosity_levels vl) | |
| 165 { | |
| 166 if (vl > vect_verbosity_level) | |
| 167 return false; | |
| 168 | |
| 169 if (!current_function_decl || !vect_dump) | |
| 170 return false; | |
| 171 | |
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172 if (vect_location == UNKNOWN_LOC) |
| 0 | 173 fprintf (vect_dump, "\n%s:%d: note: ", |
| 174 DECL_SOURCE_FILE (current_function_decl), | |
| 175 DECL_SOURCE_LINE (current_function_decl)); | |
| 176 else | |
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177 fprintf (vect_dump, "\n%s:%d: note: ", |
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178 LOC_FILE (vect_location), LOC_LINE (vect_location)); |
| 0 | 179 |
| 180 return true; | |
| 181 } | |
| 182 | |
| 183 | |
| 184 /* Function vectorize_loops. | |
|
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185 |
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186 Entry point to loop vectorization phase. */ |
| 0 | 187 |
| 188 unsigned | |
| 189 vectorize_loops (void) | |
| 190 { | |
| 191 unsigned int i; | |
| 192 unsigned int num_vectorized_loops = 0; | |
| 193 unsigned int vect_loops_num; | |
| 194 loop_iterator li; | |
| 195 struct loop *loop; | |
| 196 | |
| 197 vect_loops_num = number_of_loops (); | |
| 198 | |
| 199 /* Bail out if there are no loops. */ | |
| 200 if (vect_loops_num <= 1) | |
| 201 return 0; | |
| 202 | |
| 203 /* Fix the verbosity level if not defined explicitly by the user. */ | |
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204 vect_set_dump_settings (false); |
| 0 | 205 |
| 206 init_stmt_vec_info_vec (); | |
| 207 | |
| 208 /* ----------- Analyze loops. ----------- */ | |
| 209 | |
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210 /* If some loop was duplicated, it gets bigger number |
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211 than all previously defined loops. This fact allows us to run |
| 0 | 212 only over initial loops skipping newly generated ones. */ |
| 213 FOR_EACH_LOOP (li, loop, 0) | |
| 214 if (optimize_loop_nest_for_speed_p (loop)) | |
| 215 { | |
| 216 loop_vec_info loop_vinfo; | |
| 217 | |
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218 vect_location = find_loop_location (loop); |
| 0 | 219 loop_vinfo = vect_analyze_loop (loop); |
| 220 loop->aux = loop_vinfo; | |
| 221 | |
| 222 if (!loop_vinfo || !LOOP_VINFO_VECTORIZABLE_P (loop_vinfo)) | |
| 223 continue; | |
| 224 | |
| 225 vect_transform_loop (loop_vinfo); | |
| 226 num_vectorized_loops++; | |
| 227 } | |
|
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228 |
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229 vect_location = UNKNOWN_LOC; |
| 0 | 230 |
| 231 statistics_counter_event (cfun, "Vectorized loops", num_vectorized_loops); | |
|
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232 if (vect_print_dump_info (REPORT_UNVECTORIZED_LOCATIONS) |
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233 || (num_vectorized_loops > 0 |
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234 && vect_print_dump_info (REPORT_VECTORIZED_LOCATIONS))) |
| 0 | 235 fprintf (vect_dump, "vectorized %u loops in function.\n", |
| 236 num_vectorized_loops); | |
| 237 | |
| 238 /* ----------- Finalize. ----------- */ | |
| 239 | |
|
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240 mark_sym_for_renaming (gimple_vop (cfun)); |
| 0 | 241 |
| 242 for (i = 1; i < vect_loops_num; i++) | |
| 243 { | |
| 244 loop_vec_info loop_vinfo; | |
| 245 | |
| 246 loop = get_loop (i); | |
| 247 if (!loop) | |
| 248 continue; | |
| 249 loop_vinfo = (loop_vec_info) loop->aux; | |
| 250 destroy_loop_vec_info (loop_vinfo, true); | |
| 251 loop->aux = NULL; | |
| 252 } | |
| 253 | |
| 254 free_stmt_vec_info_vec (); | |
| 255 | |
| 256 return num_vectorized_loops > 0 ? TODO_cleanup_cfg : 0; | |
| 257 } | |
| 258 | |
|
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259 |
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260 /* Entry point to basic block SLP phase. */ |
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261 |
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262 static unsigned int |
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263 execute_vect_slp (void) |
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264 { |
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265 basic_block bb; |
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266 |
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267 /* Fix the verbosity level if not defined explicitly by the user. */ |
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268 vect_set_dump_settings (true); |
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269 |
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270 init_stmt_vec_info_vec (); |
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271 |
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272 FOR_EACH_BB (bb) |
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273 { |
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274 vect_location = find_bb_location (bb); |
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275 |
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276 if (vect_slp_analyze_bb (bb)) |
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277 { |
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278 vect_slp_transform_bb (bb); |
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279 |
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280 if (vect_print_dump_info (REPORT_VECTORIZED_LOCATIONS)) |
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281 fprintf (vect_dump, "basic block vectorized using SLP\n"); |
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282 } |
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283 } |
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284 |
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285 free_stmt_vec_info_vec (); |
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286 return 0; |
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287 } |
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288 |
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289 static bool |
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290 gate_vect_slp (void) |
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291 { |
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292 /* Apply SLP either if the vectorizer is on and the user didn't specify |
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293 whether to run SLP or not, or if the SLP flag was set by the user. */ |
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294 return ((flag_tree_vectorize != 0 && flag_tree_slp_vectorize != 0) |
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295 || flag_tree_slp_vectorize == 1); |
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296 } |
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297 |
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298 struct gimple_opt_pass pass_slp_vectorize = |
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299 { |
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300 { |
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301 GIMPLE_PASS, |
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302 "slp", /* name */ |
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303 gate_vect_slp, /* gate */ |
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304 execute_vect_slp, /* execute */ |
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305 NULL, /* sub */ |
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306 NULL, /* next */ |
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307 0, /* static_pass_number */ |
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308 TV_TREE_SLP_VECTORIZATION, /* tv_id */ |
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309 PROP_ssa | PROP_cfg, /* properties_required */ |
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310 0, /* properties_provided */ |
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311 0, /* properties_destroyed */ |
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312 0, /* todo_flags_start */ |
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313 TODO_ggc_collect |
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314 | TODO_verify_ssa |
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315 | TODO_dump_func |
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316 | TODO_update_ssa |
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317 | TODO_verify_stmts /* todo_flags_finish */ |
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318 } |
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319 }; |
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320 |
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321 |
| 0 | 322 /* Increase alignment of global arrays to improve vectorization potential. |
| 323 TODO: | |
| 324 - Consider also structs that have an array field. | |
| 325 - Use ipa analysis to prune arrays that can't be vectorized? | |
| 326 This should involve global alignment analysis and in the future also | |
| 327 array padding. */ | |
| 328 | |
| 329 static unsigned int | |
| 330 increase_alignment (void) | |
| 331 { | |
| 332 struct varpool_node *vnode; | |
| 333 | |
| 334 /* Increase the alignment of all global arrays for vectorization. */ | |
| 335 for (vnode = varpool_nodes_queue; | |
| 336 vnode; | |
| 337 vnode = vnode->next_needed) | |
| 338 { | |
| 339 tree vectype, decl = vnode->decl; | |
|
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340 tree t; |
| 0 | 341 unsigned int alignment; |
| 342 | |
|
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343 t = TREE_TYPE(decl); |
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344 if (TREE_CODE (t) != ARRAY_TYPE) |
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345 continue; |
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346 vectype = get_vectype_for_scalar_type (strip_array_types (t)); |
| 0 | 347 if (!vectype) |
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348 continue; |
| 0 | 349 alignment = TYPE_ALIGN (vectype); |
| 350 if (DECL_ALIGN (decl) >= alignment) | |
|
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351 continue; |
| 0 | 352 |
| 353 if (vect_can_force_dr_alignment_p (decl, alignment)) | |
|
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354 { |
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355 DECL_ALIGN (decl) = TYPE_ALIGN (vectype); |
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356 DECL_USER_ALIGN (decl) = 1; |
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357 if (dump_file) |
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358 { |
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359 fprintf (dump_file, "Increasing alignment of decl: "); |
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360 print_generic_expr (dump_file, decl, TDF_SLIM); |
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361 fprintf (dump_file, "\n"); |
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362 } |
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363 } |
| 0 | 364 } |
| 365 return 0; | |
| 366 } | |
| 367 | |
|
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368 |
| 0 | 369 static bool |
| 370 gate_increase_alignment (void) | |
| 371 { | |
| 372 return flag_section_anchors && flag_tree_vectorize; | |
| 373 } | |
| 374 | |
|
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375 |
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376 struct simple_ipa_opt_pass pass_ipa_increase_alignment = |
| 0 | 377 { |
| 378 { | |
| 379 SIMPLE_IPA_PASS, | |
|
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380 "increase_alignment", /* name */ |
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381 gate_increase_alignment, /* gate */ |
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382 increase_alignment, /* execute */ |
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383 NULL, /* sub */ |
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update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
384 NULL, /* next */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
385 0, /* static_pass_number */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
386 TV_NONE, /* tv_id */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
387 0, /* properties_required */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
388 0, /* properties_provided */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
389 0, /* properties_destroyed */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
390 0, /* todo_flags_start */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
391 0 /* todo_flags_finish */ |
| 0 | 392 } |
| 393 }; |