Mercurial > hg > CbC > CbC_gcc
annotate gcc/graphite-scop-detection.c @ 137:d22083d7f10b
merge
| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Thu, 08 Nov 2018 14:16:42 +0900 |
| parents | 84e7813d76e9 |
| children | 1830386684a0 |
| rev | line source |
|---|---|
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1 /* Detection of Static Control Parts (SCoP) for Graphite. |
| 131 | 2 Copyright (C) 2009-2018 Free Software Foundation, Inc. |
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3 Contributed by Sebastian Pop <sebastian.pop@amd.com> and |
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4 Tobias Grosser <grosser@fim.uni-passau.de>. |
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5 |
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6 This file is part of GCC. |
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7 |
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8 GCC is free software; you can redistribute it and/or modify |
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9 it under the terms of the GNU General Public License as published by |
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10 the Free Software Foundation; either version 3, or (at your option) |
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11 any later version. |
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12 |
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13 GCC is distributed in the hope that it will be useful, |
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 GNU General Public License for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with GCC; see the file COPYING3. If not see |
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20 <http://www.gnu.org/licenses/>. */ |
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21 |
| 111 | 22 #define USES_ISL |
| 23 | |
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24 #include "config.h" |
| 111 | 25 |
| 26 #ifdef HAVE_isl | |
| 27 | |
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28 #include "system.h" |
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29 #include "coretypes.h" |
| 111 | 30 #include "backend.h" |
| 31 #include "cfghooks.h" | |
| 32 #include "domwalk.h" | |
| 33 #include "params.h" | |
| 34 #include "tree.h" | |
| 35 #include "gimple.h" | |
| 36 #include "ssa.h" | |
| 37 #include "fold-const.h" | |
| 38 #include "gimple-iterator.h" | |
| 39 #include "tree-cfg.h" | |
| 40 #include "tree-ssa-loop-manip.h" | |
| 41 #include "tree-ssa-loop-niter.h" | |
| 42 #include "tree-ssa-loop.h" | |
| 43 #include "tree-into-ssa.h" | |
| 44 #include "tree-ssa.h" | |
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45 #include "cfgloop.h" |
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46 #include "tree-data-ref.h" |
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47 #include "tree-scalar-evolution.h" |
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48 #include "tree-pass.h" |
| 111 | 49 #include "tree-ssa-propagate.h" |
| 50 #include "gimple-pretty-print.h" | |
| 51 #include "cfganal.h" | |
| 52 #include "graphite.h" | |
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53 |
| 111 | 54 class debug_printer |
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55 { |
| 111 | 56 private: |
| 57 FILE *dump_file; | |
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58 |
| 111 | 59 public: |
| 60 void | |
| 61 set_dump_file (FILE *f) | |
| 62 { | |
| 63 gcc_assert (f); | |
| 64 dump_file = f; | |
| 65 } | |
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66 |
| 111 | 67 friend debug_printer & |
| 68 operator<< (debug_printer &output, int i) | |
| 69 { | |
| 70 fprintf (output.dump_file, "%d", i); | |
| 71 return output; | |
| 72 } | |
| 73 friend debug_printer & | |
| 74 operator<< (debug_printer &output, const char *s) | |
| 75 { | |
| 76 fprintf (output.dump_file, "%s", s); | |
| 77 return output; | |
| 78 } | |
| 79 } dp; | |
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80 |
| 111 | 81 #define DEBUG_PRINT(args) do \ |
| 82 { \ | |
| 83 if (dump_file && (dump_flags & TDF_DETAILS)) { args; } \ | |
| 131 | 84 } while (0) |
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85 |
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86 /* Pretty print to FILE all the SCoPs in DOT format and mark them with |
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87 different colors. If there are not enough colors, paint the |
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88 remaining SCoPs in gray. |
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89 |
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90 Special nodes: |
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91 - "*" after the node number denotes the entry of a SCoP, |
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92 - "#" after the node number denotes the exit of a SCoP, |
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93 - "()" around the node number denotes the entry or the |
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94 exit nodes of the SCOP. These are not part of SCoP. */ |
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95 |
| 111 | 96 DEBUG_FUNCTION void |
| 97 dot_all_sese (FILE *file, vec<sese_l>& scops) | |
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98 { |
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99 /* Disable debugging while printing graph. */ |
| 111 | 100 dump_flags_t tmp_dump_flags = dump_flags; |
| 101 dump_flags = TDF_NONE; | |
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102 |
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103 fprintf (file, "digraph all {\n"); |
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104 |
| 111 | 105 basic_block bb; |
| 106 FOR_ALL_BB_FN (bb, cfun) | |
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107 { |
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108 int part_of_scop = false; |
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109 |
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110 /* Use HTML for every bb label. So we are able to print bbs |
| 111 | 111 which are part of two different SCoPs, with two different |
| 112 background colors. */ | |
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113 fprintf (file, "%d [label=<\n <TABLE BORDER=\"0\" CELLBORDER=\"1\" ", |
| 111 | 114 bb->index); |
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115 fprintf (file, "CELLSPACING=\"0\">\n"); |
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116 |
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117 /* Select color for SCoP. */ |
| 111 | 118 sese_l *region; |
| 119 int i; | |
| 120 FOR_EACH_VEC_ELT (scops, i, region) | |
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121 { |
| 111 | 122 bool sese_in_region = bb_in_sese_p (bb, *region); |
| 123 if (sese_in_region || (region->exit->dest == bb) | |
| 124 || (region->entry->dest == bb)) | |
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125 { |
| 111 | 126 const char *color; |
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127 switch (i % 17) |
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128 { |
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129 case 0: /* red */ |
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130 color = "#e41a1c"; |
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131 break; |
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132 case 1: /* blue */ |
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133 color = "#377eb8"; |
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134 break; |
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135 case 2: /* green */ |
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136 color = "#4daf4a"; |
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137 break; |
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138 case 3: /* purple */ |
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139 color = "#984ea3"; |
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140 break; |
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141 case 4: /* orange */ |
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142 color = "#ff7f00"; |
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143 break; |
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144 case 5: /* yellow */ |
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145 color = "#ffff33"; |
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146 break; |
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147 case 6: /* brown */ |
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148 color = "#a65628"; |
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149 break; |
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150 case 7: /* rose */ |
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151 color = "#f781bf"; |
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152 break; |
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153 case 8: |
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154 color = "#8dd3c7"; |
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155 break; |
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156 case 9: |
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157 color = "#ffffb3"; |
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158 break; |
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159 case 10: |
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160 color = "#bebada"; |
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161 break; |
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162 case 11: |
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163 color = "#fb8072"; |
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164 break; |
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165 case 12: |
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166 color = "#80b1d3"; |
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167 break; |
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168 case 13: |
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169 color = "#fdb462"; |
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170 break; |
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171 case 14: |
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172 color = "#b3de69"; |
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173 break; |
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174 case 15: |
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175 color = "#fccde5"; |
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176 break; |
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177 case 16: |
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178 color = "#bc80bd"; |
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179 break; |
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180 default: /* gray */ |
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181 color = "#999999"; |
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182 } |
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183 |
| 111 | 184 fprintf (file, " <TR><TD WIDTH=\"50\" BGCOLOR=\"%s\">", |
| 185 color); | |
|
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186 |
| 111 | 187 if (!sese_in_region) |
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188 fprintf (file, " ("); |
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189 |
| 111 | 190 if (bb == region->entry->dest && bb == region->exit->dest) |
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191 fprintf (file, " %d*# ", bb->index); |
| 111 | 192 else if (bb == region->entry->dest) |
|
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193 fprintf (file, " %d* ", bb->index); |
| 111 | 194 else if (bb == region->exit->dest) |
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195 fprintf (file, " %d# ", bb->index); |
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196 else |
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197 fprintf (file, " %d ", bb->index); |
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198 |
| 111 | 199 fprintf (file, "{lp_%d}", bb->loop_father->num); |
| 200 | |
| 201 if (!sese_in_region) | |
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202 fprintf (file, ")"); |
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203 |
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204 fprintf (file, "</TD></TR>\n"); |
| 111 | 205 part_of_scop = true; |
|
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206 } |
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207 } |
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208 |
| 111 | 209 if (!part_of_scop) |
| 210 { | |
| 211 fprintf (file, " <TR><TD WIDTH=\"50\" BGCOLOR=\"#ffffff\">"); | |
| 212 fprintf (file, " %d {lp_%d} </TD></TR>\n", bb->index, | |
| 213 bb->loop_father->num); | |
| 214 } | |
| 215 fprintf (file, " </TABLE>>, shape=box, style=\"setlinewidth(0)\"]\n"); | |
|
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216 } |
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217 |
| 111 | 218 FOR_ALL_BB_FN (bb, cfun) |
| 219 { | |
| 220 edge e; | |
| 221 edge_iterator ei; | |
| 222 FOR_EACH_EDGE (e, ei, bb->succs) | |
| 223 fprintf (file, "%d -> %d;\n", bb->index, e->dest->index); | |
| 224 } | |
|
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225 |
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226 fputs ("}\n\n", file); |
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227 |
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228 /* Enable debugging again. */ |
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229 dump_flags = tmp_dump_flags; |
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230 } |
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231 |
| 111 | 232 /* Display SCoP on stderr. */ |
|
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233 |
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234 DEBUG_FUNCTION void |
| 111 | 235 dot_sese (sese_l& scop) |
|
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236 { |
| 111 | 237 vec<sese_l> scops; |
| 238 scops.create (1); | |
|
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239 |
| 111 | 240 if (scop) |
| 241 scops.safe_push (scop); | |
|
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242 |
| 111 | 243 dot_all_sese (stderr, scops); |
| 244 | |
| 245 scops.release (); | |
|
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246 } |
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247 |
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248 DEBUG_FUNCTION void |
| 111 | 249 dot_cfg () |
|
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250 { |
| 111 | 251 vec<sese_l> scops; |
| 252 scops.create (1); | |
| 253 dot_all_sese (stderr, scops); | |
| 254 scops.release (); | |
| 255 } | |
| 256 | |
| 257 /* Returns a COND_EXPR statement when BB has a single predecessor, the | |
| 258 edge between BB and its predecessor is not a loop exit edge, and | |
| 259 the last statement of the single predecessor is a COND_EXPR. */ | |
| 260 | |
| 261 static gcond * | |
| 262 single_pred_cond_non_loop_exit (basic_block bb) | |
| 263 { | |
| 264 if (single_pred_p (bb)) | |
| 265 { | |
| 266 edge e = single_pred_edge (bb); | |
| 267 basic_block pred = e->src; | |
| 268 gimple *stmt; | |
| 269 | |
| 270 if (loop_depth (pred->loop_father) > loop_depth (bb->loop_father)) | |
| 271 return NULL; | |
| 272 | |
| 273 stmt = last_stmt (pred); | |
|
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274 |
| 111 | 275 if (stmt && gimple_code (stmt) == GIMPLE_COND) |
| 276 return as_a<gcond *> (stmt); | |
| 277 } | |
| 278 | |
| 279 return NULL; | |
| 280 } | |
| 281 | |
| 282 namespace | |
| 283 { | |
| 284 | |
| 285 /* Build the maximal scop containing LOOPs and add it to SCOPS. */ | |
|
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286 |
| 111 | 287 class scop_detection |
| 288 { | |
| 289 public: | |
| 290 scop_detection () : scops (vNULL) {} | |
| 291 | |
| 292 ~scop_detection () | |
| 293 { | |
| 294 scops.release (); | |
| 295 } | |
| 296 | |
| 297 /* A marker for invalid sese_l. */ | |
| 298 static sese_l invalid_sese; | |
| 299 | |
| 300 /* Return the SCOPS in this SCOP_DETECTION. */ | |
| 301 | |
| 302 vec<sese_l> | |
| 303 get_scops () | |
|
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304 { |
| 111 | 305 return scops; |
| 306 } | |
| 307 | |
| 308 /* Return an sese_l around the LOOP. */ | |
| 309 | |
| 310 sese_l get_sese (loop_p loop); | |
| 311 | |
| 312 /* Merge scops at same loop depth and returns the new sese. | |
| 313 Returns a new SESE when merge was successful, INVALID_SESE otherwise. */ | |
| 314 | |
| 315 sese_l merge_sese (sese_l first, sese_l second) const; | |
| 316 | |
| 317 /* Build scop outer->inner if possible. */ | |
| 318 | |
| 319 void build_scop_depth (loop_p loop); | |
| 320 | |
| 321 /* Return true when BEGIN is the preheader edge of a loop with a single exit | |
| 322 END. */ | |
| 323 | |
| 324 static bool region_has_one_loop (sese_l s); | |
| 325 | |
| 326 /* Add to SCOPS a scop starting at SCOP_BEGIN and ending at SCOP_END. */ | |
| 327 | |
| 328 void add_scop (sese_l s); | |
| 329 | |
| 330 /* Returns true if S1 subsumes/surrounds S2. */ | |
| 331 static bool subsumes (sese_l s1, sese_l s2); | |
| 332 | |
| 333 /* Remove a SCoP which is subsumed by S1. */ | |
| 334 void remove_subscops (sese_l s1); | |
| 335 | |
| 336 /* Returns true if S1 intersects with S2. Since we already know that S1 does | |
| 337 not subsume S2 or vice-versa, we only check for entry bbs. */ | |
| 338 | |
| 339 static bool intersects (sese_l s1, sese_l s2); | |
| 340 | |
| 341 /* Remove one of the scops when it intersects with any other. */ | |
| 342 | |
| 343 void remove_intersecting_scops (sese_l s1); | |
| 344 | |
| 345 /* Return true when a statement in SCOP cannot be represented by Graphite. */ | |
| 346 | |
| 347 bool harmful_loop_in_region (sese_l scop) const; | |
| 348 | |
| 349 /* Return true only when STMT is simple enough for being handled by Graphite. | |
| 350 This depends on SCOP, as the parameters are initialized relatively to | |
| 351 this basic block, the linear functions are initialized based on the | |
| 352 outermost loop containing STMT inside the SCOP. BB is the place where we | |
| 353 try to evaluate the STMT. */ | |
| 354 | |
| 355 bool stmt_simple_for_scop_p (sese_l scop, gimple *stmt, | |
| 356 basic_block bb) const; | |
| 357 | |
| 358 /* Something like "n * m" is not allowed. */ | |
| 359 | |
| 360 static bool graphite_can_represent_init (tree e); | |
| 361 | |
| 362 /* Return true when SCEV can be represented in the polyhedral model. | |
| 363 | |
| 364 An expression can be represented, if it can be expressed as an | |
| 365 affine expression. For loops (i, j) and parameters (m, n) all | |
| 366 affine expressions are of the form: | |
| 367 | |
| 368 x1 * i + x2 * j + x3 * m + x4 * n + x5 * 1 where x1..x5 element of Z | |
| 369 | |
| 370 1 i + 20 j + (-2) m + 25 | |
| 371 | |
| 372 Something like "i * n" or "n * m" is not allowed. */ | |
| 373 | |
| 374 static bool graphite_can_represent_scev (sese_l scop, tree scev); | |
| 375 | |
| 376 /* Return true when EXPR can be represented in the polyhedral model. | |
| 377 | |
| 378 This means an expression can be represented, if it is linear with respect | |
| 379 to the loops and the strides are non parametric. LOOP is the place where | |
| 380 the expr will be evaluated. SCOP defines the region we analyse. */ | |
| 381 | |
| 382 static bool graphite_can_represent_expr (sese_l scop, loop_p loop, | |
| 383 tree expr); | |
| 384 | |
| 385 /* Return true if the data references of STMT can be represented by Graphite. | |
| 386 We try to analyze the data references in a loop contained in the SCOP. */ | |
| 387 | |
| 388 static bool stmt_has_simple_data_refs_p (sese_l scop, gimple *stmt); | |
| 389 | |
| 390 /* Remove the close phi node at GSI and replace its rhs with the rhs | |
| 391 of PHI. */ | |
| 392 | |
| 393 static void remove_duplicate_close_phi (gphi *phi, gphi_iterator *gsi); | |
| 394 | |
| 395 /* Returns true when Graphite can represent LOOP in SCOP. | |
| 396 FIXME: For the moment, graphite cannot be used on loops that iterate using | |
| 397 induction variables that wrap. */ | |
| 398 | |
| 399 static bool can_represent_loop (loop_p loop, sese_l scop); | |
| 400 | |
| 401 /* Returns the number of pbbs that are in loops contained in SCOP. */ | |
| 402 | |
| 403 static int nb_pbbs_in_loops (scop_p scop); | |
| 404 | |
| 405 private: | |
| 406 vec<sese_l> scops; | |
| 407 }; | |
| 408 | |
| 409 sese_l scop_detection::invalid_sese (NULL, NULL); | |
| 410 | |
| 411 /* Return an sese_l around the LOOP. */ | |
| 412 | |
| 413 sese_l | |
| 414 scop_detection::get_sese (loop_p loop) | |
| 415 { | |
| 416 if (!loop) | |
| 417 return invalid_sese; | |
| 418 | |
| 419 edge scop_begin = loop_preheader_edge (loop); | |
| 420 edge scop_end = single_exit (loop); | |
| 131 | 421 if (!scop_end || (scop_end->flags & (EDGE_COMPLEX|EDGE_FAKE))) |
| 111 | 422 return invalid_sese; |
| 423 | |
| 424 return sese_l (scop_begin, scop_end); | |
| 425 } | |
| 426 | |
| 427 /* Merge scops at same loop depth and returns the new sese. | |
| 428 Returns a new SESE when merge was successful, INVALID_SESE otherwise. */ | |
| 429 | |
| 430 sese_l | |
| 431 scop_detection::merge_sese (sese_l first, sese_l second) const | |
| 432 { | |
| 433 /* In the trivial case first/second may be NULL. */ | |
| 434 if (!first) | |
| 435 return second; | |
| 436 if (!second) | |
| 437 return first; | |
| 438 | |
| 439 DEBUG_PRINT (dp << "[scop-detection] try merging sese s1: "; | |
| 440 print_sese (dump_file, first); | |
| 441 dp << "[scop-detection] try merging sese s2: "; | |
| 442 print_sese (dump_file, second)); | |
| 443 | |
| 131 | 444 auto_bitmap worklist, in_sese_region; |
| 445 bitmap_set_bit (worklist, get_entry_bb (first)->index); | |
| 446 bitmap_set_bit (worklist, get_exit_bb (first)->index); | |
| 447 bitmap_set_bit (worklist, get_entry_bb (second)->index); | |
| 448 bitmap_set_bit (worklist, get_exit_bb (second)->index); | |
| 449 edge entry = NULL, exit = NULL; | |
| 111 | 450 |
| 131 | 451 /* We can optimize the case of adding a loop entry dest or exit |
| 452 src to the worklist (for single-exit loops) by skipping | |
| 453 directly to the exit dest / entry src. in_sese_region | |
| 454 doesn't have to cover all blocks in the region but merely | |
| 455 its border it acts more like a visited bitmap. */ | |
| 456 do | |
| 457 { | |
| 458 int index = bitmap_first_set_bit (worklist); | |
| 459 bitmap_clear_bit (worklist, index); | |
| 460 basic_block bb = BASIC_BLOCK_FOR_FN (cfun, index); | |
| 461 edge_iterator ei; | |
| 462 edge e; | |
| 111 | 463 |
| 131 | 464 /* With fake exit edges we can end up with no possible exit. */ |
| 465 if (index == EXIT_BLOCK) | |
| 466 { | |
| 467 DEBUG_PRINT (dp << "[scop-detection-fail] cannot merge seses.\n"); | |
| 468 return invalid_sese; | |
| 469 } | |
| 111 | 470 |
| 131 | 471 bitmap_set_bit (in_sese_region, bb->index); |
| 472 | |
| 473 basic_block dom = get_immediate_dominator (CDI_DOMINATORS, bb); | |
| 474 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 475 if (e->src == dom | |
| 476 && (! entry | |
| 477 || dominated_by_p (CDI_DOMINATORS, entry->dest, bb))) | |
| 478 { | |
| 479 if (entry | |
| 480 && ! bitmap_bit_p (in_sese_region, entry->src->index)) | |
| 481 bitmap_set_bit (worklist, entry->src->index); | |
| 482 entry = e; | |
| 483 } | |
| 484 else if (! bitmap_bit_p (in_sese_region, e->src->index)) | |
| 485 bitmap_set_bit (worklist, e->src->index); | |
| 111 | 486 |
| 131 | 487 basic_block pdom = get_immediate_dominator (CDI_POST_DOMINATORS, bb); |
| 488 FOR_EACH_EDGE (e, ei, bb->succs) | |
| 489 if (e->dest == pdom | |
| 490 && (! exit | |
| 491 || dominated_by_p (CDI_POST_DOMINATORS, exit->src, bb))) | |
| 492 { | |
| 493 if (exit | |
| 494 && ! bitmap_bit_p (in_sese_region, exit->dest->index)) | |
| 495 bitmap_set_bit (worklist, exit->dest->index); | |
| 496 exit = e; | |
| 497 } | |
| 498 else if (! bitmap_bit_p (in_sese_region, e->dest->index)) | |
| 499 bitmap_set_bit (worklist, e->dest->index); | |
| 500 } | |
| 501 while (! bitmap_empty_p (worklist)); | |
| 111 | 502 |
| 503 sese_l combined (entry, exit); | |
| 504 | |
| 505 DEBUG_PRINT (dp << "[merged-sese] s1: "; print_sese (dump_file, combined)); | |
| 506 | |
| 507 return combined; | |
| 508 } | |
| 509 | |
| 510 /* Build scop outer->inner if possible. */ | |
|
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|
511 |
| 111 | 512 void |
| 513 scop_detection::build_scop_depth (loop_p loop) | |
| 514 { | |
| 515 sese_l s = invalid_sese; | |
| 516 loop = loop->inner; | |
| 517 while (loop) | |
| 518 { | |
| 519 sese_l next = get_sese (loop); | |
| 520 if (! next | |
| 521 || harmful_loop_in_region (next)) | |
| 522 { | |
| 523 if (s) | |
| 524 add_scop (s); | |
| 525 build_scop_depth (loop); | |
| 526 s = invalid_sese; | |
| 527 } | |
| 528 else if (! s) | |
| 529 s = next; | |
| 530 else | |
| 531 { | |
| 532 sese_l combined = merge_sese (s, next); | |
| 533 if (! combined | |
| 534 || harmful_loop_in_region (combined)) | |
| 535 { | |
| 536 add_scop (s); | |
| 537 s = next; | |
| 538 } | |
| 539 else | |
| 540 s = combined; | |
| 541 } | |
| 542 loop = loop->next; | |
| 543 } | |
| 544 if (s) | |
| 545 add_scop (s); | |
| 546 } | |
| 547 | |
| 548 /* Returns true when Graphite can represent LOOP in SCOP. | |
| 549 FIXME: For the moment, graphite cannot be used on loops that iterate using | |
| 550 induction variables that wrap. */ | |
| 551 | |
| 552 bool | |
| 553 scop_detection::can_represent_loop (loop_p loop, sese_l scop) | |
| 554 { | |
| 555 tree niter; | |
| 556 struct tree_niter_desc niter_desc; | |
| 557 | |
| 558 return single_exit (loop) | |
| 559 && !(loop_preheader_edge (loop)->flags & EDGE_IRREDUCIBLE_LOOP) | |
| 560 && number_of_iterations_exit (loop, single_exit (loop), &niter_desc, false) | |
| 561 && niter_desc.control.no_overflow | |
| 562 && (niter = number_of_latch_executions (loop)) | |
| 563 && !chrec_contains_undetermined (niter) | |
| 564 && !chrec_contains_undetermined (scalar_evolution_in_region (scop, | |
| 565 loop, niter)) | |
| 566 && graphite_can_represent_expr (scop, loop, niter); | |
| 567 } | |
| 568 | |
| 569 /* Return true when BEGIN is the preheader edge of a loop with a single exit | |
| 570 END. */ | |
| 571 | |
| 572 bool | |
| 573 scop_detection::region_has_one_loop (sese_l s) | |
| 574 { | |
| 575 edge begin = s.entry; | |
| 576 edge end = s.exit; | |
| 577 /* Check for a single perfectly nested loop. */ | |
| 578 if (begin->dest->loop_father->inner) | |
| 579 return false; | |
| 580 | |
| 581 /* Otherwise, check whether we have adjacent loops. */ | |
| 582 return (single_pred_p (end->src) | |
| 583 && begin->dest->loop_father == single_pred (end->src)->loop_father); | |
| 584 } | |
| 585 | |
| 586 /* Add to SCOPS a scop starting at SCOP_BEGIN and ending at SCOP_END. */ | |
| 587 | |
| 588 void | |
| 589 scop_detection::add_scop (sese_l s) | |
| 590 { | |
| 591 gcc_assert (s); | |
| 592 | |
| 131 | 593 /* If the exit edge is fake discard the SCoP for now as we're removing the |
| 594 fake edges again after analysis. */ | |
| 595 if (s.exit->flags & EDGE_FAKE) | |
| 596 { | |
| 597 DEBUG_PRINT (dp << "[scop-detection-fail] Discarding infinite loop SCoP: "; | |
| 598 print_sese (dump_file, s)); | |
| 599 return; | |
| 600 } | |
| 601 | |
| 602 /* Include the BB with the loop-closed SSA PHI nodes, we need this | |
| 603 block in the region for code-generating out-of-SSA copies. | |
| 604 canonicalize_loop_closed_ssa makes sure that is in proper shape. */ | |
| 605 if (s.exit->dest != EXIT_BLOCK_PTR_FOR_FN (cfun) | |
| 606 && loop_exit_edge_p (s.exit->src->loop_father, s.exit)) | |
| 607 { | |
| 608 gcc_assert (single_pred_p (s.exit->dest) | |
| 609 && single_succ_p (s.exit->dest) | |
| 610 && sese_trivially_empty_bb_p (s.exit->dest)); | |
| 611 s.exit = single_succ_edge (s.exit->dest); | |
| 612 } | |
| 613 | |
| 111 | 614 /* Do not add scops with only one loop. */ |
| 615 if (region_has_one_loop (s)) | |
| 616 { | |
| 617 DEBUG_PRINT (dp << "[scop-detection-fail] Discarding one loop SCoP: "; | |
| 618 print_sese (dump_file, s)); | |
| 619 return; | |
| 620 } | |
| 621 | |
| 622 if (get_exit_bb (s) == EXIT_BLOCK_PTR_FOR_FN (cfun)) | |
| 623 { | |
| 624 DEBUG_PRINT (dp << "[scop-detection-fail] " | |
| 625 << "Discarding SCoP exiting to return: "; | |
| 626 print_sese (dump_file, s)); | |
| 627 return; | |
| 628 } | |
| 629 | |
| 630 /* Remove all the scops which are subsumed by s. */ | |
| 631 remove_subscops (s); | |
| 632 | |
| 633 /* Remove intersecting scops. FIXME: It will be a good idea to keep | |
| 634 the non-intersecting part of the scop already in the list. */ | |
| 635 remove_intersecting_scops (s); | |
| 636 | |
| 637 scops.safe_push (s); | |
| 638 DEBUG_PRINT (dp << "[scop-detection] Adding SCoP: "; print_sese (dump_file, s)); | |
| 639 } | |
| 640 | |
| 641 /* Return true when a statement in SCOP cannot be represented by Graphite. */ | |
| 642 | |
| 643 bool | |
| 644 scop_detection::harmful_loop_in_region (sese_l scop) const | |
| 645 { | |
| 646 basic_block exit_bb = get_exit_bb (scop); | |
| 647 basic_block entry_bb = get_entry_bb (scop); | |
| 648 | |
| 649 DEBUG_PRINT (dp << "[checking-harmful-bbs] "; | |
| 650 print_sese (dump_file, scop)); | |
| 651 gcc_assert (dominated_by_p (CDI_DOMINATORS, exit_bb, entry_bb)); | |
| 652 | |
| 653 auto_vec<basic_block> worklist; | |
| 654 auto_bitmap loops; | |
| 655 | |
| 656 worklist.safe_push (entry_bb); | |
| 657 while (! worklist.is_empty ()) | |
| 658 { | |
| 659 basic_block bb = worklist.pop (); | |
| 660 DEBUG_PRINT (dp << "Visiting bb_" << bb->index << "\n"); | |
| 661 | |
| 662 /* The basic block should not be part of an irreducible loop. */ | |
| 663 if (bb->flags & BB_IRREDUCIBLE_LOOP) | |
| 664 return true; | |
| 665 | |
| 666 /* Check for unstructured control flow: CFG not generated by structured | |
| 667 if-then-else. */ | |
| 668 if (bb->succs->length () > 1) | |
| 669 { | |
| 670 edge e; | |
| 671 edge_iterator ei; | |
| 672 FOR_EACH_EDGE (e, ei, bb->succs) | |
| 673 if (!dominated_by_p (CDI_POST_DOMINATORS, bb, e->dest) | |
| 674 && !dominated_by_p (CDI_DOMINATORS, e->dest, bb)) | |
| 675 return true; | |
| 676 } | |
| 677 | |
| 678 /* Collect all loops in the current region. */ | |
| 679 loop_p loop = bb->loop_father; | |
| 680 if (loop_in_sese_p (loop, scop)) | |
| 681 bitmap_set_bit (loops, loop->num); | |
| 682 | |
| 683 /* Check for harmful statements in basic blocks part of the region. */ | |
| 684 for (gimple_stmt_iterator gsi = gsi_start_bb (bb); | |
| 685 !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 686 if (!stmt_simple_for_scop_p (scop, gsi_stmt (gsi), bb)) | |
| 687 return true; | |
| 688 | |
| 131 | 689 for (basic_block dom = first_dom_son (CDI_DOMINATORS, bb); |
| 690 dom; | |
| 691 dom = next_dom_son (CDI_DOMINATORS, dom)) | |
| 692 if (dom != scop.exit->dest) | |
| 111 | 693 worklist.safe_push (dom); |
| 694 } | |
| 695 | |
| 696 /* Go through all loops and check that they are still valid in the combined | |
| 697 scop. */ | |
| 698 unsigned j; | |
| 699 bitmap_iterator bi; | |
| 700 EXECUTE_IF_SET_IN_BITMAP (loops, 0, j, bi) | |
| 701 { | |
| 702 loop_p loop = (*current_loops->larray)[j]; | |
| 703 gcc_assert (loop->num == (int) j); | |
| 704 | |
| 705 /* Check if the loop nests are to be optimized for speed. */ | |
| 706 if (! loop->inner | |
| 707 && ! optimize_loop_for_speed_p (loop)) | |
| 708 { | |
| 709 DEBUG_PRINT (dp << "[scop-detection-fail] loop_" | |
| 710 << loop->num << " is not on a hot path.\n"); | |
| 711 return true; | |
| 712 } | |
|
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parents:
diff
changeset
|
713 |
| 111 | 714 if (! can_represent_loop (loop, scop)) |
| 715 { | |
| 716 DEBUG_PRINT (dp << "[scop-detection-fail] cannot represent loop_" | |
| 717 << loop->num << "\n"); | |
| 718 return true; | |
| 719 } | |
| 720 | |
| 721 /* Check if all loop nests have at least one data reference. | |
| 722 ??? This check is expensive and loops premature at this point. | |
| 723 If important to retain we can pre-compute this for all innermost | |
| 724 loops and reject those when we build a SESE region for a loop | |
| 725 during SESE discovery. */ | |
| 726 if (! loop->inner | |
| 727 && ! loop_nest_has_data_refs (loop)) | |
| 728 { | |
| 729 DEBUG_PRINT (dp << "[scop-detection-fail] loop_" << loop->num | |
| 730 << "does not have any data reference.\n"); | |
| 731 return true; | |
| 732 } | |
| 733 } | |
| 734 | |
| 735 return false; | |
| 736 } | |
| 737 | |
| 738 /* Returns true if S1 subsumes/surrounds S2. */ | |
| 739 bool | |
| 740 scop_detection::subsumes (sese_l s1, sese_l s2) | |
| 741 { | |
| 742 if (dominated_by_p (CDI_DOMINATORS, get_entry_bb (s2), | |
| 743 get_entry_bb (s1)) | |
| 744 && dominated_by_p (CDI_POST_DOMINATORS, s2.exit->dest, | |
| 745 s1.exit->dest)) | |
| 746 return true; | |
| 747 return false; | |
| 748 } | |
| 749 | |
| 750 /* Remove a SCoP which is subsumed by S1. */ | |
| 751 void | |
| 752 scop_detection::remove_subscops (sese_l s1) | |
| 753 { | |
| 754 int j; | |
| 755 sese_l *s2; | |
| 756 FOR_EACH_VEC_ELT_REVERSE (scops, j, s2) | |
| 757 { | |
| 758 if (subsumes (s1, *s2)) | |
| 759 { | |
| 760 DEBUG_PRINT (dp << "Removing sub-SCoP"; | |
| 761 print_sese (dump_file, *s2)); | |
| 762 scops.unordered_remove (j); | |
| 763 } | |
| 764 } | |
| 765 } | |
| 766 | |
| 767 /* Returns true if S1 intersects with S2. Since we already know that S1 does | |
| 768 not subsume S2 or vice-versa, we only check for entry bbs. */ | |
| 769 | |
| 770 bool | |
| 771 scop_detection::intersects (sese_l s1, sese_l s2) | |
| 772 { | |
| 773 if (dominated_by_p (CDI_DOMINATORS, get_entry_bb (s2), | |
| 774 get_entry_bb (s1)) | |
| 775 && !dominated_by_p (CDI_DOMINATORS, get_entry_bb (s2), | |
| 776 get_exit_bb (s1))) | |
| 777 return true; | |
| 778 if ((s1.exit == s2.entry) || (s2.exit == s1.entry)) | |
| 779 return true; | |
| 780 | |
| 781 return false; | |
| 782 } | |
| 783 | |
| 784 /* Remove one of the scops when it intersects with any other. */ | |
| 785 | |
| 786 void | |
| 787 scop_detection::remove_intersecting_scops (sese_l s1) | |
| 788 { | |
| 789 int j; | |
| 790 sese_l *s2; | |
| 791 FOR_EACH_VEC_ELT_REVERSE (scops, j, s2) | |
| 792 { | |
| 793 if (intersects (s1, *s2)) | |
| 794 { | |
| 795 DEBUG_PRINT (dp << "Removing intersecting SCoP"; | |
| 796 print_sese (dump_file, *s2); | |
| 797 dp << "Intersects with:"; | |
| 798 print_sese (dump_file, s1)); | |
| 799 scops.unordered_remove (j); | |
| 800 } | |
| 801 } | |
| 802 } | |
| 803 | |
| 804 /* Something like "n * m" is not allowed. */ | |
| 805 | |
| 806 bool | |
| 807 scop_detection::graphite_can_represent_init (tree e) | |
| 808 { | |
| 809 switch (TREE_CODE (e)) | |
| 810 { | |
| 811 case POLYNOMIAL_CHREC: | |
| 812 return graphite_can_represent_init (CHREC_LEFT (e)) | |
| 813 && graphite_can_represent_init (CHREC_RIGHT (e)); | |
| 814 | |
| 815 case MULT_EXPR: | |
| 816 if (chrec_contains_symbols (TREE_OPERAND (e, 0))) | |
| 817 return graphite_can_represent_init (TREE_OPERAND (e, 0)) | |
| 818 && tree_fits_shwi_p (TREE_OPERAND (e, 1)); | |
| 819 else | |
| 820 return graphite_can_represent_init (TREE_OPERAND (e, 1)) | |
| 821 && tree_fits_shwi_p (TREE_OPERAND (e, 0)); | |
| 822 | |
| 823 case PLUS_EXPR: | |
| 824 case POINTER_PLUS_EXPR: | |
| 825 case MINUS_EXPR: | |
| 826 return graphite_can_represent_init (TREE_OPERAND (e, 0)) | |
| 827 && graphite_can_represent_init (TREE_OPERAND (e, 1)); | |
| 828 | |
| 829 case NEGATE_EXPR: | |
| 830 case BIT_NOT_EXPR: | |
| 831 CASE_CONVERT: | |
| 832 case NON_LVALUE_EXPR: | |
| 833 return graphite_can_represent_init (TREE_OPERAND (e, 0)); | |
| 834 | |
| 835 default: | |
| 836 break; | |
| 837 } | |
| 838 | |
| 839 return true; | |
| 840 } | |
| 841 | |
| 842 /* Return true when SCEV can be represented in the polyhedral model. | |
| 843 | |
| 844 An expression can be represented, if it can be expressed as an | |
| 845 affine expression. For loops (i, j) and parameters (m, n) all | |
| 846 affine expressions are of the form: | |
| 847 | |
| 848 x1 * i + x2 * j + x3 * m + x4 * n + x5 * 1 where x1..x5 element of Z | |
| 849 | |
| 850 1 i + 20 j + (-2) m + 25 | |
| 851 | |
| 852 Something like "i * n" or "n * m" is not allowed. */ | |
| 853 | |
| 854 bool | |
| 855 scop_detection::graphite_can_represent_scev (sese_l scop, tree scev) | |
| 856 { | |
| 857 if (chrec_contains_undetermined (scev)) | |
| 858 return false; | |
| 859 | |
| 860 switch (TREE_CODE (scev)) | |
| 861 { | |
| 862 case NEGATE_EXPR: | |
| 863 case BIT_NOT_EXPR: | |
| 864 CASE_CONVERT: | |
| 865 case NON_LVALUE_EXPR: | |
| 866 return graphite_can_represent_scev (scop, TREE_OPERAND (scev, 0)); | |
| 867 | |
| 868 case PLUS_EXPR: | |
| 869 case POINTER_PLUS_EXPR: | |
| 870 case MINUS_EXPR: | |
| 871 return graphite_can_represent_scev (scop, TREE_OPERAND (scev, 0)) | |
| 872 && graphite_can_represent_scev (scop, TREE_OPERAND (scev, 1)); | |
| 873 | |
| 874 case MULT_EXPR: | |
| 875 return !CONVERT_EXPR_CODE_P (TREE_CODE (TREE_OPERAND (scev, 0))) | |
| 876 && !CONVERT_EXPR_CODE_P (TREE_CODE (TREE_OPERAND (scev, 1))) | |
| 877 && !(chrec_contains_symbols (TREE_OPERAND (scev, 0)) | |
| 878 && chrec_contains_symbols (TREE_OPERAND (scev, 1))) | |
| 879 && graphite_can_represent_init (scev) | |
| 880 && graphite_can_represent_scev (scop, TREE_OPERAND (scev, 0)) | |
| 881 && graphite_can_represent_scev (scop, TREE_OPERAND (scev, 1)); | |
| 882 | |
| 883 case POLYNOMIAL_CHREC: | |
| 884 /* Check for constant strides. With a non constant stride of | |
| 885 'n' we would have a value of 'iv * n'. Also check that the | |
| 886 initial value can represented: for example 'n * m' cannot be | |
| 887 represented. */ | |
| 888 gcc_assert (loop_in_sese_p (get_loop (cfun, | |
| 889 CHREC_VARIABLE (scev)), scop)); | |
| 890 if (!evolution_function_right_is_integer_cst (scev) | |
| 891 || !graphite_can_represent_init (scev)) | |
| 892 return false; | |
| 893 return graphite_can_represent_scev (scop, CHREC_LEFT (scev)); | |
| 894 | |
| 895 default: | |
| 896 break; | |
| 897 } | |
| 898 | |
| 899 /* Only affine functions can be represented. */ | |
| 900 if (tree_contains_chrecs (scev, NULL) || !scev_is_linear_expression (scev)) | |
| 901 return false; | |
| 902 | |
| 903 return true; | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
904 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
905 |
| 111 | 906 /* Return true when EXPR can be represented in the polyhedral model. |
| 907 | |
| 908 This means an expression can be represented, if it is linear with respect to | |
| 909 the loops and the strides are non parametric. LOOP is the place where the | |
| 910 expr will be evaluated. SCOP defines the region we analyse. */ | |
| 911 | |
| 912 bool | |
| 913 scop_detection::graphite_can_represent_expr (sese_l scop, loop_p loop, | |
| 914 tree expr) | |
| 915 { | |
| 916 tree scev = scalar_evolution_in_region (scop, loop, expr); | |
| 917 return graphite_can_represent_scev (scop, scev); | |
| 918 } | |
| 919 | |
| 920 /* Return true if the data references of STMT can be represented by Graphite. | |
| 921 We try to analyze the data references in a loop contained in the SCOP. */ | |
| 922 | |
| 923 bool | |
| 924 scop_detection::stmt_has_simple_data_refs_p (sese_l scop, gimple *stmt) | |
| 925 { | |
| 131 | 926 edge nest = scop.entry; |
| 111 | 927 loop_p loop = loop_containing_stmt (stmt); |
| 928 if (!loop_in_sese_p (loop, scop)) | |
| 929 loop = NULL; | |
| 930 | |
| 931 auto_vec<data_reference_p> drs; | |
| 932 if (! graphite_find_data_references_in_stmt (nest, loop, stmt, &drs)) | |
| 933 return false; | |
| 934 | |
| 935 int j; | |
| 936 data_reference_p dr; | |
| 937 FOR_EACH_VEC_ELT (drs, j, dr) | |
| 938 { | |
| 939 for (unsigned i = 0; i < DR_NUM_DIMENSIONS (dr); ++i) | |
| 940 if (! graphite_can_represent_scev (scop, DR_ACCESS_FN (dr, i))) | |
| 941 return false; | |
| 942 } | |
| 943 | |
| 944 return true; | |
| 945 } | |
| 946 | |
| 947 /* GIMPLE_ASM and GIMPLE_CALL may embed arbitrary side effects. | |
| 948 Calls have side-effects, except those to const or pure | |
| 949 functions. */ | |
| 950 | |
| 951 static bool | |
| 952 stmt_has_side_effects (gimple *stmt) | |
| 953 { | |
| 954 if (gimple_has_volatile_ops (stmt) | |
| 955 || (gimple_code (stmt) == GIMPLE_CALL | |
| 956 && !(gimple_call_flags (stmt) & (ECF_CONST | ECF_PURE))) | |
| 957 || (gimple_code (stmt) == GIMPLE_ASM)) | |
| 958 { | |
| 959 DEBUG_PRINT (dp << "[scop-detection-fail] " | |
| 960 << "Statement has side-effects:\n"; | |
| 961 print_gimple_stmt (dump_file, stmt, 0, TDF_VOPS | TDF_MEMSYMS)); | |
| 962 return true; | |
| 963 } | |
| 964 return false; | |
| 965 } | |
| 966 | |
| 967 /* Return true only when STMT is simple enough for being handled by Graphite. | |
| 968 This depends on SCOP, as the parameters are initialized relatively to | |
| 969 this basic block, the linear functions are initialized based on the outermost | |
| 970 loop containing STMT inside the SCOP. BB is the place where we try to | |
| 971 evaluate the STMT. */ | |
| 972 | |
| 973 bool | |
| 974 scop_detection::stmt_simple_for_scop_p (sese_l scop, gimple *stmt, | |
| 975 basic_block bb) const | |
| 976 { | |
| 977 gcc_assert (scop); | |
| 978 | |
| 979 if (is_gimple_debug (stmt)) | |
| 980 return true; | |
| 981 | |
| 982 if (stmt_has_side_effects (stmt)) | |
| 983 return false; | |
| 984 | |
| 985 if (!stmt_has_simple_data_refs_p (scop, stmt)) | |
| 986 { | |
| 987 DEBUG_PRINT (dp << "[scop-detection-fail] " | |
| 988 << "Graphite cannot handle data-refs in stmt:\n"; | |
| 989 print_gimple_stmt (dump_file, stmt, 0, TDF_VOPS|TDF_MEMSYMS);); | |
| 990 return false; | |
| 991 } | |
| 992 | |
| 993 switch (gimple_code (stmt)) | |
| 994 { | |
| 995 case GIMPLE_LABEL: | |
| 996 return true; | |
| 997 | |
| 998 case GIMPLE_COND: | |
| 999 { | |
| 1000 /* We can handle all binary comparisons. Inequalities are | |
| 1001 also supported as they can be represented with union of | |
| 1002 polyhedra. */ | |
| 1003 enum tree_code code = gimple_cond_code (stmt); | |
| 1004 if (!(code == LT_EXPR | |
| 1005 || code == GT_EXPR | |
| 1006 || code == LE_EXPR | |
| 1007 || code == GE_EXPR | |
| 1008 || code == EQ_EXPR | |
| 1009 || code == NE_EXPR)) | |
| 1010 { | |
| 1011 DEBUG_PRINT (dp << "[scop-detection-fail] " | |
| 1012 << "Graphite cannot handle cond stmt:\n"; | |
| 1013 print_gimple_stmt (dump_file, stmt, 0, | |
| 1014 TDF_VOPS | TDF_MEMSYMS)); | |
| 1015 return false; | |
| 1016 } | |
| 1017 | |
| 1018 loop_p loop = bb->loop_father; | |
| 1019 for (unsigned i = 0; i < 2; ++i) | |
| 1020 { | |
| 1021 tree op = gimple_op (stmt, i); | |
| 1022 if (!graphite_can_represent_expr (scop, loop, op) | |
| 1023 /* We can only constrain on integer type. */ | |
| 1024 || ! INTEGRAL_TYPE_P (TREE_TYPE (op))) | |
| 1025 { | |
| 1026 DEBUG_PRINT (dp << "[scop-detection-fail] " | |
| 1027 << "Graphite cannot represent stmt:\n"; | |
| 1028 print_gimple_stmt (dump_file, stmt, 0, | |
| 1029 TDF_VOPS | TDF_MEMSYMS)); | |
| 1030 return false; | |
| 1031 } | |
| 1032 } | |
| 1033 | |
| 1034 return true; | |
| 1035 } | |
| 1036 | |
| 1037 case GIMPLE_ASSIGN: | |
| 1038 case GIMPLE_CALL: | |
| 131 | 1039 { |
| 1040 tree op, lhs = gimple_get_lhs (stmt); | |
| 1041 ssa_op_iter i; | |
| 1042 /* If we are not going to instantiate the stmt do not require | |
| 1043 its operands to be instantiatable at this point. */ | |
| 1044 if (lhs | |
| 1045 && TREE_CODE (lhs) == SSA_NAME | |
| 1046 && scev_analyzable_p (lhs, scop)) | |
| 1047 return true; | |
| 1048 /* Verify that if we can analyze operands at their def site we | |
| 1049 also can represent them when analyzed at their uses. */ | |
| 1050 FOR_EACH_SSA_TREE_OPERAND (op, stmt, i, SSA_OP_USE) | |
| 1051 if (scev_analyzable_p (op, scop) | |
| 1052 && chrec_contains_undetermined | |
| 1053 (scalar_evolution_in_region (scop, bb->loop_father, op))) | |
| 1054 { | |
| 1055 DEBUG_PRINT (dp << "[scop-detection-fail] " | |
| 1056 << "Graphite cannot code-gen stmt:\n"; | |
| 1057 print_gimple_stmt (dump_file, stmt, 0, | |
| 1058 TDF_VOPS | TDF_MEMSYMS)); | |
| 1059 return false; | |
| 1060 } | |
| 1061 return true; | |
| 1062 } | |
| 111 | 1063 |
| 1064 default: | |
| 1065 /* These nodes cut a new scope. */ | |
| 1066 DEBUG_PRINT ( | |
| 1067 dp << "[scop-detection-fail] " | |
| 1068 << "Gimple stmt not handled in Graphite:\n"; | |
| 1069 print_gimple_stmt (dump_file, stmt, 0, TDF_VOPS | TDF_MEMSYMS)); | |
| 1070 return false; | |
| 1071 } | |
| 1072 } | |
| 1073 | |
| 1074 /* Returns the number of pbbs that are in loops contained in SCOP. */ | |
| 1075 | |
| 1076 int | |
| 1077 scop_detection::nb_pbbs_in_loops (scop_p scop) | |
| 1078 { | |
| 1079 int i; | |
| 1080 poly_bb_p pbb; | |
| 1081 int res = 0; | |
| 1082 | |
| 1083 FOR_EACH_VEC_ELT (scop->pbbs, i, pbb) | |
| 1084 if (loop_in_sese_p (gbb_loop (PBB_BLACK_BOX (pbb)), scop->scop_info->region)) | |
| 1085 res++; | |
| 1086 | |
| 1087 return res; | |
| 1088 } | |
| 1089 | |
| 1090 /* Assigns the parameter NAME an index in REGION. */ | |
| 1091 | |
| 1092 static void | |
| 1093 assign_parameter_index_in_region (tree name, sese_info_p region) | |
| 1094 { | |
| 1095 gcc_assert (TREE_CODE (name) == SSA_NAME | |
| 1096 && INTEGRAL_TYPE_P (TREE_TYPE (name)) | |
| 1097 && ! defined_in_sese_p (name, region->region)); | |
| 1098 | |
| 1099 int i; | |
| 1100 tree p; | |
| 1101 FOR_EACH_VEC_ELT (region->params, i, p) | |
| 1102 if (p == name) | |
| 1103 return; | |
| 1104 | |
| 1105 i = region->params.length (); | |
| 1106 region->params.safe_push (name); | |
| 1107 } | |
| 1108 | |
| 1109 /* In the context of sese S, scan the expression E and translate it to | |
| 1110 a linear expression C. When parsing a symbolic multiplication, K | |
| 1111 represents the constant multiplier of an expression containing | |
| 1112 parameters. */ | |
| 1113 | |
| 1114 static void | |
| 1115 scan_tree_for_params (sese_info_p s, tree e) | |
| 1116 { | |
| 1117 if (e == chrec_dont_know) | |
| 1118 return; | |
| 1119 | |
| 1120 switch (TREE_CODE (e)) | |
| 1121 { | |
| 1122 case POLYNOMIAL_CHREC: | |
| 1123 scan_tree_for_params (s, CHREC_LEFT (e)); | |
| 1124 break; | |
| 1125 | |
| 1126 case MULT_EXPR: | |
| 1127 if (chrec_contains_symbols (TREE_OPERAND (e, 0))) | |
| 1128 scan_tree_for_params (s, TREE_OPERAND (e, 0)); | |
| 1129 else | |
| 1130 scan_tree_for_params (s, TREE_OPERAND (e, 1)); | |
| 1131 break; | |
| 1132 | |
| 1133 case PLUS_EXPR: | |
| 1134 case POINTER_PLUS_EXPR: | |
| 1135 case MINUS_EXPR: | |
| 1136 scan_tree_for_params (s, TREE_OPERAND (e, 0)); | |
| 1137 scan_tree_for_params (s, TREE_OPERAND (e, 1)); | |
| 1138 break; | |
| 1139 | |
| 1140 case NEGATE_EXPR: | |
| 1141 case BIT_NOT_EXPR: | |
| 1142 CASE_CONVERT: | |
| 1143 case NON_LVALUE_EXPR: | |
| 1144 scan_tree_for_params (s, TREE_OPERAND (e, 0)); | |
| 1145 break; | |
| 1146 | |
| 1147 case SSA_NAME: | |
| 1148 assign_parameter_index_in_region (e, s); | |
| 1149 break; | |
| 1150 | |
| 1151 case INTEGER_CST: | |
| 1152 case ADDR_EXPR: | |
| 1153 case REAL_CST: | |
| 1154 case COMPLEX_CST: | |
| 1155 case VECTOR_CST: | |
| 1156 break; | |
| 1157 | |
| 1158 default: | |
| 1159 gcc_unreachable (); | |
| 1160 break; | |
| 1161 } | |
| 1162 } | |
| 1163 | |
| 1164 /* Find parameters with respect to REGION in BB. We are looking in memory | |
| 1165 access functions, conditions and loop bounds. */ | |
| 1166 | |
| 1167 static void | |
| 1168 find_params_in_bb (sese_info_p region, gimple_poly_bb_p gbb) | |
| 1169 { | |
| 1170 /* Find parameters in the access functions of data references. */ | |
| 1171 int i; | |
| 1172 data_reference_p dr; | |
| 1173 FOR_EACH_VEC_ELT (GBB_DATA_REFS (gbb), i, dr) | |
| 1174 for (unsigned j = 0; j < DR_NUM_DIMENSIONS (dr); j++) | |
| 1175 scan_tree_for_params (region, DR_ACCESS_FN (dr, j)); | |
| 1176 | |
| 1177 /* Find parameters in conditional statements. */ | |
| 1178 gimple *stmt; | |
| 1179 FOR_EACH_VEC_ELT (GBB_CONDITIONS (gbb), i, stmt) | |
| 1180 { | |
| 131 | 1181 loop_p loop = gimple_bb (stmt)->loop_father; |
| 111 | 1182 tree lhs = scalar_evolution_in_region (region->region, loop, |
| 1183 gimple_cond_lhs (stmt)); | |
| 1184 tree rhs = scalar_evolution_in_region (region->region, loop, | |
| 1185 gimple_cond_rhs (stmt)); | |
| 131 | 1186 gcc_assert (!chrec_contains_undetermined (lhs) |
| 1187 && !chrec_contains_undetermined (rhs)); | |
| 111 | 1188 |
| 1189 scan_tree_for_params (region, lhs); | |
| 1190 scan_tree_for_params (region, rhs); | |
| 1191 } | |
| 1192 } | |
| 1193 | |
| 1194 /* Record the parameters used in the SCOP BBs. A variable is a parameter | |
| 1195 in a scop if it does not vary during the execution of that scop. */ | |
| 1196 | |
| 1197 static void | |
| 1198 find_scop_parameters (scop_p scop) | |
| 1199 { | |
| 1200 unsigned i; | |
| 1201 sese_info_p region = scop->scop_info; | |
| 1202 | |
| 1203 /* Parameters used in loop bounds are processed during gather_bbs. */ | |
| 1204 | |
| 1205 /* Find the parameters used in data accesses. */ | |
| 1206 poly_bb_p pbb; | |
| 1207 FOR_EACH_VEC_ELT (scop->pbbs, i, pbb) | |
| 1208 find_params_in_bb (region, PBB_BLACK_BOX (pbb)); | |
| 1209 | |
| 1210 int nbp = sese_nb_params (region); | |
| 1211 scop_set_nb_params (scop, nbp); | |
| 1212 } | |
| 1213 | |
| 1214 static void | |
| 1215 add_write (vec<tree> *writes, tree def) | |
| 1216 { | |
| 1217 writes->safe_push (def); | |
| 1218 DEBUG_PRINT (dp << "Adding scalar write: "; | |
| 1219 print_generic_expr (dump_file, def); | |
| 1220 dp << "\nFrom stmt: "; | |
| 1221 print_gimple_stmt (dump_file, | |
| 1222 SSA_NAME_DEF_STMT (def), 0)); | |
| 1223 } | |
| 1224 | |
| 1225 static void | |
| 1226 add_read (vec<scalar_use> *reads, tree use, gimple *use_stmt) | |
| 1227 { | |
| 1228 DEBUG_PRINT (dp << "Adding scalar read: "; | |
| 1229 print_generic_expr (dump_file, use); | |
| 1230 dp << "\nFrom stmt: "; | |
| 1231 print_gimple_stmt (dump_file, use_stmt, 0)); | |
| 1232 reads->safe_push (std::make_pair (use_stmt, use)); | |
| 1233 } | |
| 1234 | |
| 1235 | |
| 1236 /* Record DEF if it is used in other bbs different than DEF_BB in the SCOP. */ | |
| 1237 | |
| 1238 static void | |
| 1239 build_cross_bb_scalars_def (scop_p scop, tree def, basic_block def_bb, | |
| 1240 vec<tree> *writes) | |
| 1241 { | |
| 1242 if (!is_gimple_reg (def)) | |
| 1243 return; | |
| 1244 | |
| 1245 bool scev_analyzable = scev_analyzable_p (def, scop->scop_info->region); | |
| 1246 | |
| 1247 gimple *use_stmt; | |
| 1248 imm_use_iterator imm_iter; | |
| 1249 FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, def) | |
| 1250 /* Do not gather scalar variables that can be analyzed by SCEV as they can | |
| 1251 be generated out of the induction variables. */ | |
| 1252 if ((! scev_analyzable | |
| 1253 /* But gather SESE liveouts as we otherwise fail to rewrite their | |
| 1254 exit PHIs. */ | |
| 1255 || ! bb_in_sese_p (gimple_bb (use_stmt), scop->scop_info->region)) | |
| 1256 && (def_bb != gimple_bb (use_stmt) && !is_gimple_debug (use_stmt))) | |
| 1257 { | |
| 1258 add_write (writes, def); | |
| 1259 /* This is required by the FOR_EACH_IMM_USE_STMT when we want to break | |
| 1260 before all the uses have been visited. */ | |
| 1261 BREAK_FROM_IMM_USE_STMT (imm_iter); | |
| 1262 } | |
| 1263 } | |
| 1264 | |
| 1265 /* Record USE if it is defined in other bbs different than USE_STMT | |
| 1266 in the SCOP. */ | |
| 1267 | |
| 1268 static void | |
| 1269 build_cross_bb_scalars_use (scop_p scop, tree use, gimple *use_stmt, | |
| 1270 vec<scalar_use> *reads) | |
| 1271 { | |
| 1272 if (!is_gimple_reg (use)) | |
| 1273 return; | |
| 1274 | |
| 1275 /* Do not gather scalar variables that can be analyzed by SCEV as they can be | |
| 1276 generated out of the induction variables. */ | |
| 1277 if (scev_analyzable_p (use, scop->scop_info->region)) | |
| 1278 return; | |
| 1279 | |
| 1280 gimple *def_stmt = SSA_NAME_DEF_STMT (use); | |
| 1281 if (gimple_bb (def_stmt) != gimple_bb (use_stmt)) | |
| 1282 add_read (reads, use, use_stmt); | |
| 1283 } | |
| 1284 | |
| 1285 /* Generates a polyhedral black box only if the bb contains interesting | |
| 1286 information. */ | |
| 1287 | |
| 1288 static gimple_poly_bb_p | |
| 1289 try_generate_gimple_bb (scop_p scop, basic_block bb) | |
| 1290 { | |
| 1291 vec<data_reference_p> drs = vNULL; | |
| 1292 vec<tree> writes = vNULL; | |
| 1293 vec<scalar_use> reads = vNULL; | |
| 1294 | |
| 1295 sese_l region = scop->scop_info->region; | |
| 1296 edge nest = region.entry; | |
| 1297 loop_p loop = bb->loop_father; | |
| 1298 if (!loop_in_sese_p (loop, region)) | |
| 1299 loop = NULL; | |
| 1300 | |
| 1301 for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi); | |
| 1302 gsi_next (&gsi)) | |
| 1303 { | |
| 1304 gimple *stmt = gsi_stmt (gsi); | |
| 1305 if (is_gimple_debug (stmt)) | |
| 1306 continue; | |
| 1307 | |
| 1308 graphite_find_data_references_in_stmt (nest, loop, stmt, &drs); | |
| 1309 | |
| 1310 tree def = gimple_get_lhs (stmt); | |
| 1311 if (def) | |
| 1312 build_cross_bb_scalars_def (scop, def, gimple_bb (stmt), &writes); | |
| 1313 | |
| 1314 ssa_op_iter iter; | |
| 1315 tree use; | |
| 1316 FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_USE) | |
| 1317 build_cross_bb_scalars_use (scop, use, stmt, &reads); | |
| 1318 } | |
| 1319 | |
| 1320 /* Handle defs and uses in PHIs. Those need special treatment given | |
| 1321 that we have to present ISL with sth that looks like we've rewritten | |
| 1322 the IL out-of-SSA. */ | |
| 1323 for (gphi_iterator psi = gsi_start_phis (bb); !gsi_end_p (psi); | |
| 1324 gsi_next (&psi)) | |
| 1325 { | |
| 1326 gphi *phi = psi.phi (); | |
| 1327 tree res = gimple_phi_result (phi); | |
| 1328 if (virtual_operand_p (res) | |
| 1329 || scev_analyzable_p (res, scop->scop_info->region)) | |
| 1330 continue; | |
| 1331 /* To simulate out-of-SSA the block containing the PHI node has | |
| 1332 reads of the PHI destination. And to preserve SSA dependences | |
| 1333 we also write to it (the out-of-SSA decl and the SSA result | |
| 1334 are coalesced for dependence purposes which is good enough). */ | |
| 1335 add_read (&reads, res, phi); | |
| 1336 add_write (&writes, res); | |
| 1337 } | |
| 1338 basic_block bb_for_succs = bb; | |
| 1339 if (bb_for_succs == bb_for_succs->loop_father->latch | |
| 1340 && bb_in_sese_p (bb_for_succs, scop->scop_info->region) | |
| 1341 && sese_trivially_empty_bb_p (bb_for_succs)) | |
| 1342 bb_for_succs = NULL; | |
| 1343 while (bb_for_succs) | |
| 1344 { | |
| 1345 basic_block latch = NULL; | |
| 1346 edge_iterator ei; | |
| 1347 edge e; | |
| 1348 FOR_EACH_EDGE (e, ei, bb_for_succs->succs) | |
| 1349 { | |
| 1350 for (gphi_iterator psi = gsi_start_phis (e->dest); !gsi_end_p (psi); | |
| 1351 gsi_next (&psi)) | |
| 1352 { | |
| 1353 gphi *phi = psi.phi (); | |
| 1354 tree res = gimple_phi_result (phi); | |
| 1355 if (virtual_operand_p (res)) | |
| 1356 continue; | |
| 1357 /* To simulate out-of-SSA the predecessor of edges into PHI nodes | |
| 1358 has a copy from the PHI argument to the PHI destination. */ | |
| 1359 if (! scev_analyzable_p (res, scop->scop_info->region)) | |
| 1360 add_write (&writes, res); | |
| 1361 tree use = PHI_ARG_DEF_FROM_EDGE (phi, e); | |
| 1362 if (TREE_CODE (use) == SSA_NAME | |
| 1363 && ! SSA_NAME_IS_DEFAULT_DEF (use) | |
| 1364 && gimple_bb (SSA_NAME_DEF_STMT (use)) != bb_for_succs | |
| 1365 && ! scev_analyzable_p (use, scop->scop_info->region)) | |
| 1366 add_read (&reads, use, phi); | |
| 1367 } | |
| 1368 if (e->dest == bb_for_succs->loop_father->latch | |
| 1369 && bb_in_sese_p (e->dest, scop->scop_info->region) | |
| 1370 && sese_trivially_empty_bb_p (e->dest)) | |
| 1371 latch = e->dest; | |
| 1372 } | |
| 1373 /* Handle empty latch block PHIs here, otherwise we confuse ISL | |
| 1374 with extra conditional code where it then peels off the last | |
| 1375 iteration just because of that. It would be simplest if we | |
| 1376 just didn't force simple latches (thus remove the forwarder). */ | |
| 1377 bb_for_succs = latch; | |
| 1378 } | |
| 1379 | |
| 1380 /* For the region exit block add reads for all live-out vars. */ | |
| 1381 if (bb == scop->scop_info->region.exit->src) | |
| 1382 { | |
| 1383 sese_build_liveouts (scop->scop_info); | |
| 1384 unsigned i; | |
| 1385 bitmap_iterator bi; | |
| 1386 EXECUTE_IF_SET_IN_BITMAP (scop->scop_info->liveout, 0, i, bi) | |
| 1387 { | |
| 1388 tree use = ssa_name (i); | |
| 1389 add_read (&reads, use, NULL); | |
| 1390 } | |
| 1391 } | |
| 1392 | |
| 1393 if (drs.is_empty () && writes.is_empty () && reads.is_empty ()) | |
| 1394 return NULL; | |
| 1395 | |
| 1396 return new_gimple_poly_bb (bb, drs, reads, writes); | |
| 1397 } | |
| 1398 | |
| 1399 /* Compute alias-sets for all data references in DRS. */ | |
| 1400 | |
| 1401 static bool | |
| 1402 build_alias_set (scop_p scop) | |
| 1403 { | |
| 1404 int num_vertices = scop->drs.length (); | |
| 1405 struct graph *g = new_graph (num_vertices); | |
| 1406 dr_info *dr1, *dr2; | |
| 1407 int i, j; | |
| 1408 int *all_vertices; | |
| 1409 | |
| 1410 FOR_EACH_VEC_ELT (scop->drs, i, dr1) | |
| 1411 for (j = i+1; scop->drs.iterate (j, &dr2); j++) | |
| 1412 if (dr_may_alias_p (dr1->dr, dr2->dr, true)) | |
| 1413 { | |
| 1414 /* Dependences in the same alias set need to be handled | |
| 1415 by just looking at DR_ACCESS_FNs. */ | |
| 1416 if (DR_NUM_DIMENSIONS (dr1->dr) == 0 | |
| 1417 || DR_NUM_DIMENSIONS (dr1->dr) != DR_NUM_DIMENSIONS (dr2->dr) | |
| 1418 || ! operand_equal_p (DR_BASE_OBJECT (dr1->dr), | |
| 1419 DR_BASE_OBJECT (dr2->dr), | |
| 1420 OEP_ADDRESS_OF) | |
| 1421 || ! types_compatible_p (TREE_TYPE (DR_BASE_OBJECT (dr1->dr)), | |
| 1422 TREE_TYPE (DR_BASE_OBJECT (dr2->dr)))) | |
| 1423 { | |
| 1424 free_graph (g); | |
| 1425 return false; | |
| 1426 } | |
| 1427 add_edge (g, i, j); | |
| 1428 add_edge (g, j, i); | |
| 1429 } | |
| 1430 | |
| 1431 all_vertices = XNEWVEC (int, num_vertices); | |
| 1432 for (i = 0; i < num_vertices; i++) | |
| 1433 all_vertices[i] = i; | |
| 1434 | |
| 1435 scop->max_alias_set | |
| 1436 = graphds_dfs (g, all_vertices, num_vertices, NULL, true, NULL) + 1; | |
| 1437 free (all_vertices); | |
| 1438 | |
| 1439 for (i = 0; i < g->n_vertices; i++) | |
| 1440 scop->drs[i].alias_set = g->vertices[i].component + 1; | |
| 1441 | |
| 1442 free_graph (g); | |
| 1443 return true; | |
| 1444 } | |
| 1445 | |
| 1446 /* Gather BBs and conditions for a SCOP. */ | |
| 1447 class gather_bbs : public dom_walker | |
| 1448 { | |
| 1449 public: | |
| 1450 gather_bbs (cdi_direction, scop_p, int *); | |
| 1451 | |
| 1452 virtual edge before_dom_children (basic_block); | |
| 1453 virtual void after_dom_children (basic_block); | |
| 1454 | |
| 1455 private: | |
| 1456 auto_vec<gimple *, 3> conditions, cases; | |
| 1457 scop_p scop; | |
| 1458 }; | |
| 1459 } | |
| 1460 gather_bbs::gather_bbs (cdi_direction direction, scop_p scop, int *bb_to_rpo) | |
| 131 | 1461 : dom_walker (direction, ALL_BLOCKS, bb_to_rpo), scop (scop) |
| 111 | 1462 { |
| 1463 } | |
| 1464 | |
| 1465 /* Call-back for dom_walk executed before visiting the dominated | |
| 1466 blocks. */ | |
| 1467 | |
| 1468 edge | |
| 1469 gather_bbs::before_dom_children (basic_block bb) | |
| 1470 { | |
| 1471 sese_info_p region = scop->scop_info; | |
| 1472 if (!bb_in_sese_p (bb, region->region)) | |
| 1473 return dom_walker::STOP; | |
| 1474 | |
| 1475 /* For loops fully contained in the region record parameters in the | |
| 1476 loop bounds. */ | |
| 1477 loop_p loop = bb->loop_father; | |
| 1478 if (loop->header == bb | |
| 1479 && loop_in_sese_p (loop, region->region)) | |
| 1480 { | |
| 1481 tree nb_iters = number_of_latch_executions (loop); | |
| 1482 if (chrec_contains_symbols (nb_iters)) | |
| 1483 { | |
| 1484 nb_iters = scalar_evolution_in_region (region->region, | |
| 1485 loop, nb_iters); | |
| 1486 scan_tree_for_params (region, nb_iters); | |
| 1487 } | |
| 1488 } | |
| 1489 | |
| 131 | 1490 if (gcond *stmt = single_pred_cond_non_loop_exit (bb)) |
| 111 | 1491 { |
| 1492 edge e = single_pred_edge (bb); | |
| 131 | 1493 /* Make sure the condition is in the region and thus was verified |
| 1494 to be handled. */ | |
| 1495 if (e != region->region.entry) | |
| 1496 { | |
| 1497 conditions.safe_push (stmt); | |
| 1498 if (e->flags & EDGE_TRUE_VALUE) | |
| 1499 cases.safe_push (stmt); | |
| 1500 else | |
| 1501 cases.safe_push (NULL); | |
| 1502 } | |
| 111 | 1503 } |
| 1504 | |
| 1505 scop->scop_info->bbs.safe_push (bb); | |
| 1506 | |
| 1507 gimple_poly_bb_p gbb = try_generate_gimple_bb (scop, bb); | |
| 1508 if (!gbb) | |
| 1509 return NULL; | |
| 1510 | |
| 1511 GBB_CONDITIONS (gbb) = conditions.copy (); | |
| 1512 GBB_CONDITION_CASES (gbb) = cases.copy (); | |
| 1513 | |
| 1514 poly_bb_p pbb = new_poly_bb (scop, gbb); | |
| 1515 scop->pbbs.safe_push (pbb); | |
| 1516 | |
| 1517 int i; | |
| 1518 data_reference_p dr; | |
| 1519 FOR_EACH_VEC_ELT (gbb->data_refs, i, dr) | |
| 1520 { | |
| 1521 DEBUG_PRINT (dp << "Adding memory "; | |
| 1522 if (dr->is_read) | |
| 1523 dp << "read: "; | |
| 1524 else | |
| 1525 dp << "write: "; | |
| 1526 print_generic_expr (dump_file, dr->ref); | |
| 1527 dp << "\nFrom stmt: "; | |
| 1528 print_gimple_stmt (dump_file, dr->stmt, 0)); | |
| 1529 | |
| 1530 scop->drs.safe_push (dr_info (dr, pbb)); | |
| 1531 } | |
| 1532 | |
| 1533 return NULL; | |
| 1534 } | |
| 1535 | |
| 1536 /* Call-back for dom_walk executed after visiting the dominated | |
| 1537 blocks. */ | |
| 1538 | |
| 1539 void | |
| 1540 gather_bbs::after_dom_children (basic_block bb) | |
| 1541 { | |
| 1542 if (!bb_in_sese_p (bb, scop->scop_info->region)) | |
| 1543 return; | |
| 1544 | |
| 1545 if (single_pred_cond_non_loop_exit (bb)) | |
| 1546 { | |
| 131 | 1547 edge e = single_pred_edge (bb); |
| 1548 if (e != scop->scop_info->region.entry) | |
| 1549 { | |
| 1550 conditions.pop (); | |
| 1551 cases.pop (); | |
| 1552 } | |
| 111 | 1553 } |
| 1554 } | |
| 1555 | |
| 1556 | |
| 1557 /* Compute sth like an execution order, dominator order with first executing | |
| 1558 edges that stay inside the current loop, delaying processing exit edges. */ | |
| 1559 | |
| 131 | 1560 static int *bb_to_rpo; |
| 111 | 1561 |
| 1562 /* Helper for qsort, sorting after order above. */ | |
| 1563 | |
| 1564 static int | |
| 1565 cmp_pbbs (const void *pa, const void *pb) | |
| 1566 { | |
| 1567 poly_bb_p bb1 = *((const poly_bb_p *)pa); | |
| 1568 poly_bb_p bb2 = *((const poly_bb_p *)pb); | |
| 131 | 1569 if (bb_to_rpo[bb1->black_box->bb->index] |
| 1570 < bb_to_rpo[bb2->black_box->bb->index]) | |
| 111 | 1571 return -1; |
| 131 | 1572 else if (bb_to_rpo[bb1->black_box->bb->index] |
| 1573 > bb_to_rpo[bb2->black_box->bb->index]) | |
| 111 | 1574 return 1; |
| 1575 else | |
| 1576 return 0; | |
| 1577 } | |
| 1578 | |
| 1579 /* Find Static Control Parts (SCoP) in the current function and pushes | |
| 1580 them to SCOPS. */ | |
| 1581 | |
| 1582 void | |
| 1583 build_scops (vec<scop_p> *scops) | |
| 1584 { | |
| 1585 if (dump_file) | |
| 1586 dp.set_dump_file (dump_file); | |
| 1587 | |
| 1588 scop_detection sb; | |
| 1589 sb.build_scop_depth (current_loops->tree_root); | |
| 1590 | |
| 1591 /* Now create scops from the lightweight SESEs. */ | |
| 1592 vec<sese_l> scops_l = sb.get_scops (); | |
| 1593 | |
| 1594 /* Domwalk needs a bb to RPO mapping. Compute it once here. */ | |
| 1595 int *postorder = XNEWVEC (int, n_basic_blocks_for_fn (cfun)); | |
| 1596 int postorder_num = pre_and_rev_post_order_compute (NULL, postorder, true); | |
| 131 | 1597 bb_to_rpo = XNEWVEC (int, last_basic_block_for_fn (cfun)); |
| 111 | 1598 for (int i = 0; i < postorder_num; ++i) |
| 1599 bb_to_rpo[postorder[i]] = i; | |
| 1600 free (postorder); | |
| 1601 | |
| 1602 int i; | |
| 1603 sese_l *s; | |
| 1604 FOR_EACH_VEC_ELT (scops_l, i, s) | |
| 1605 { | |
| 1606 scop_p scop = new_scop (s->entry, s->exit); | |
| 1607 | |
| 1608 /* Record all basic blocks and their conditions in REGION. */ | |
| 1609 gather_bbs (CDI_DOMINATORS, scop, bb_to_rpo).walk (s->entry->dest); | |
| 1610 | |
| 131 | 1611 /* Sort pbbs after execution order for initial schedule generation. */ |
| 111 | 1612 scop->pbbs.qsort (cmp_pbbs); |
| 1613 | |
| 1614 if (! build_alias_set (scop)) | |
| 1615 { | |
| 1616 DEBUG_PRINT (dp << "[scop-detection-fail] cannot handle dependences\n"); | |
| 1617 free_scop (scop); | |
| 1618 continue; | |
| 1619 } | |
| 1620 | |
| 1621 /* Do not optimize a scop containing only PBBs that do not belong | |
| 1622 to any loops. */ | |
| 1623 if (sb.nb_pbbs_in_loops (scop) == 0) | |
| 1624 { | |
| 1625 DEBUG_PRINT (dp << "[scop-detection-fail] no data references.\n"); | |
| 1626 free_scop (scop); | |
| 1627 continue; | |
| 1628 } | |
| 1629 | |
| 1630 unsigned max_arrays = PARAM_VALUE (PARAM_GRAPHITE_MAX_ARRAYS_PER_SCOP); | |
| 1631 if (max_arrays > 0 | |
| 1632 && scop->drs.length () >= max_arrays) | |
| 1633 { | |
| 1634 DEBUG_PRINT (dp << "[scop-detection-fail] too many data references: " | |
| 1635 << scop->drs.length () | |
| 1636 << " is larger than --param graphite-max-arrays-per-scop=" | |
| 1637 << max_arrays << ".\n"); | |
| 1638 free_scop (scop); | |
| 1639 continue; | |
| 1640 } | |
| 1641 | |
| 1642 find_scop_parameters (scop); | |
| 1643 graphite_dim_t max_dim = PARAM_VALUE (PARAM_GRAPHITE_MAX_NB_SCOP_PARAMS); | |
| 1644 if (max_dim > 0 | |
| 1645 && scop_nb_params (scop) > max_dim) | |
| 1646 { | |
| 1647 DEBUG_PRINT (dp << "[scop-detection-fail] too many parameters: " | |
| 1648 << scop_nb_params (scop) | |
| 1649 << " larger than --param graphite-max-nb-scop-params=" | |
| 1650 << max_dim << ".\n"); | |
| 1651 free_scop (scop); | |
| 1652 continue; | |
| 1653 } | |
| 1654 | |
| 1655 scops->safe_push (scop); | |
| 1656 } | |
| 1657 | |
| 1658 free (bb_to_rpo); | |
| 131 | 1659 bb_to_rpo = NULL; |
| 111 | 1660 DEBUG_PRINT (dp << "number of SCoPs: " << (scops ? scops->length () : 0);); |
| 1661 } | |
| 1662 | |
| 1663 #endif /* HAVE_isl */ |