Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-loop-ivcanon.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | b7f97abdc517 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Induction variable canonicalization. |
|
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2 Copyright (C) 2004, 2005, 2007, 2008, 2010 |
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3 Free Software Foundation, Inc. |
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4 |
| 0 | 5 This file is part of GCC. |
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6 |
| 0 | 7 GCC is free software; you can redistribute it and/or modify it |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 3, or (at your option) any | |
| 10 later version. | |
|
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11 |
| 0 | 12 GCC is distributed in the hope that it will be useful, but WITHOUT |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
|
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16 |
| 0 | 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 /* This pass detects the loops that iterate a constant number of times, | |
|
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22 adds a canonical induction variable (step -1, tested against 0) |
| 0 | 23 and replaces the exit test. This enables the less powerful rtl |
| 24 level analysis to use this information. | |
| 25 | |
| 26 This might spoil the code in some cases (by increasing register pressure). | |
| 27 Note that in the case the new variable is not needed, ivopts will get rid | |
| 28 of it, so it might only be a problem when there are no other linear induction | |
| 29 variables. In that case the created optimization possibilities are likely | |
| 30 to pay up. | |
| 31 | |
| 32 Additionally in case we detect that it is beneficial to unroll the | |
| 33 loop completely, we do it right here to expose the optimization | |
| 34 possibilities to the following passes. */ | |
| 35 | |
| 36 #include "config.h" | |
| 37 #include "system.h" | |
| 38 #include "coretypes.h" | |
| 39 #include "tm.h" | |
| 40 #include "tree.h" | |
| 41 #include "tm_p.h" | |
| 42 #include "basic-block.h" | |
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43 #include "tree-pretty-print.h" |
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44 #include "gimple-pretty-print.h" |
| 0 | 45 #include "tree-flow.h" |
| 46 #include "tree-dump.h" | |
| 47 #include "cfgloop.h" | |
| 48 #include "tree-pass.h" | |
| 49 #include "tree-chrec.h" | |
| 50 #include "tree-scalar-evolution.h" | |
| 51 #include "params.h" | |
| 52 #include "flags.h" | |
| 53 #include "tree-inline.h" | |
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54 #include "target.h" |
| 0 | 55 |
| 56 /* Specifies types of loops that may be unrolled. */ | |
| 57 | |
| 58 enum unroll_level | |
| 59 { | |
| 60 UL_SINGLE_ITER, /* Only loops that exit immediately in the first | |
| 61 iteration. */ | |
| 62 UL_NO_GROWTH, /* Only loops whose unrolling will not cause increase | |
| 63 of code size. */ | |
| 64 UL_ALL /* All suitable loops. */ | |
| 65 }; | |
| 66 | |
| 67 /* Adds a canonical induction variable to LOOP iterating NITER times. EXIT | |
| 68 is the exit edge whose condition is replaced. */ | |
| 69 | |
| 70 static void | |
| 71 create_canonical_iv (struct loop *loop, edge exit, tree niter) | |
| 72 { | |
| 73 edge in; | |
| 74 tree type, var; | |
| 75 gimple cond; | |
| 76 gimple_stmt_iterator incr_at; | |
| 77 enum tree_code cmp; | |
| 78 | |
| 79 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 80 { | |
| 81 fprintf (dump_file, "Added canonical iv to loop %d, ", loop->num); | |
| 82 print_generic_expr (dump_file, niter, TDF_SLIM); | |
| 83 fprintf (dump_file, " iterations.\n"); | |
| 84 } | |
| 85 | |
| 86 cond = last_stmt (exit->src); | |
| 87 in = EDGE_SUCC (exit->src, 0); | |
| 88 if (in == exit) | |
| 89 in = EDGE_SUCC (exit->src, 1); | |
| 90 | |
| 91 /* Note that we do not need to worry about overflows, since | |
| 92 type of niter is always unsigned and all comparisons are | |
| 93 just for equality/nonequality -- i.e. everything works | |
| 94 with a modulo arithmetics. */ | |
| 95 | |
| 96 type = TREE_TYPE (niter); | |
| 97 niter = fold_build2 (PLUS_EXPR, type, | |
| 98 niter, | |
| 99 build_int_cst (type, 1)); | |
| 100 incr_at = gsi_last_bb (in->src); | |
| 101 create_iv (niter, | |
| 102 build_int_cst (type, -1), | |
| 103 NULL_TREE, loop, | |
| 104 &incr_at, false, NULL, &var); | |
| 105 | |
| 106 cmp = (exit->flags & EDGE_TRUE_VALUE) ? EQ_EXPR : NE_EXPR; | |
| 107 gimple_cond_set_code (cond, cmp); | |
| 108 gimple_cond_set_lhs (cond, var); | |
| 109 gimple_cond_set_rhs (cond, build_int_cst (type, 0)); | |
| 110 update_stmt (cond); | |
| 111 } | |
| 112 | |
| 113 /* Computes an estimated number of insns in LOOP, weighted by WEIGHTS. */ | |
| 114 | |
| 115 unsigned | |
| 116 tree_num_loop_insns (struct loop *loop, eni_weights *weights) | |
| 117 { | |
| 118 basic_block *body = get_loop_body (loop); | |
| 119 gimple_stmt_iterator gsi; | |
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120 unsigned size = 0, i; |
| 0 | 121 |
| 122 for (i = 0; i < loop->num_nodes; i++) | |
| 123 for (gsi = gsi_start_bb (body[i]); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 124 size += estimate_num_insns (gsi_stmt (gsi), weights); | |
| 125 free (body); | |
| 126 | |
| 127 return size; | |
| 128 } | |
| 129 | |
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130 /* Describe size of loop as detected by tree_estimate_loop_size. */ |
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131 struct loop_size |
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132 { |
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133 /* Number of instructions in the loop. */ |
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134 int overall; |
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135 |
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136 /* Number of instructions that will be likely optimized out in |
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137 peeled iterations of loop (i.e. computation based on induction |
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138 variable where induction variable starts at known constant.) */ |
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139 int eliminated_by_peeling; |
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140 |
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141 /* Same statistics for last iteration of loop: it is smaller because |
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142 instructions after exit are not executed. */ |
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143 int last_iteration; |
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144 int last_iteration_eliminated_by_peeling; |
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145 }; |
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146 |
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147 /* Return true if OP in STMT will be constant after peeling LOOP. */ |
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148 |
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149 static bool |
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150 constant_after_peeling (tree op, gimple stmt, struct loop *loop) |
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151 { |
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152 affine_iv iv; |
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153 |
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154 if (is_gimple_min_invariant (op)) |
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155 return true; |
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156 |
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157 /* We can still fold accesses to constant arrays when index is known. */ |
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158 if (TREE_CODE (op) != SSA_NAME) |
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159 { |
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160 tree base = op; |
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161 |
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162 /* First make fast look if we see constant array inside. */ |
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163 while (handled_component_p (base)) |
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164 base = TREE_OPERAND (base, 0); |
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165 if ((DECL_P (base) == VAR_DECL |
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166 && const_value_known_p (base)) |
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167 || CONSTANT_CLASS_P (base)) |
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168 { |
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169 /* If so, see if we understand all the indices. */ |
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170 base = op; |
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171 while (handled_component_p (base)) |
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172 { |
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173 if (TREE_CODE (base) == ARRAY_REF |
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174 && !constant_after_peeling (TREE_OPERAND (base, 1), stmt, loop)) |
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175 return false; |
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176 base = TREE_OPERAND (base, 0); |
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177 } |
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178 return true; |
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179 } |
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180 return false; |
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181 } |
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182 |
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183 /* Induction variables are constants. */ |
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184 if (!simple_iv (loop, loop_containing_stmt (stmt), op, &iv, false)) |
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185 return false; |
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186 if (!is_gimple_min_invariant (iv.base)) |
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187 return false; |
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188 if (!is_gimple_min_invariant (iv.step)) |
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189 return false; |
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190 return true; |
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191 } |
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192 |
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193 /* Computes an estimated number of insns in LOOP, weighted by WEIGHTS. |
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194 Return results in SIZE, estimate benefits for complete unrolling exiting by EXIT. */ |
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195 |
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196 static void |
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197 tree_estimate_loop_size (struct loop *loop, edge exit, struct loop_size *size) |
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198 { |
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199 basic_block *body = get_loop_body (loop); |
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200 gimple_stmt_iterator gsi; |
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201 unsigned int i; |
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202 bool after_exit; |
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203 |
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204 size->overall = 0; |
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205 size->eliminated_by_peeling = 0; |
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206 size->last_iteration = 0; |
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207 size->last_iteration_eliminated_by_peeling = 0; |
| 0 | 208 |
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209 if (dump_file && (dump_flags & TDF_DETAILS)) |
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210 fprintf (dump_file, "Estimating sizes for loop %i\n", loop->num); |
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211 for (i = 0; i < loop->num_nodes; i++) |
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212 { |
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213 if (exit && body[i] != exit->src |
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214 && dominated_by_p (CDI_DOMINATORS, body[i], exit->src)) |
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215 after_exit = true; |
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216 else |
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217 after_exit = false; |
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218 if (dump_file && (dump_flags & TDF_DETAILS)) |
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219 fprintf (dump_file, " BB: %i, after_exit: %i\n", body[i]->index, after_exit); |
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220 |
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221 for (gsi = gsi_start_bb (body[i]); !gsi_end_p (gsi); gsi_next (&gsi)) |
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222 { |
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223 gimple stmt = gsi_stmt (gsi); |
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224 int num = estimate_num_insns (stmt, &eni_size_weights); |
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225 bool likely_eliminated = false; |
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226 |
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227 if (dump_file && (dump_flags & TDF_DETAILS)) |
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228 { |
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229 fprintf (dump_file, " size: %3i ", num); |
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230 print_gimple_stmt (dump_file, gsi_stmt (gsi), 0, 0); |
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231 } |
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232 |
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233 /* Look for reasons why we might optimize this stmt away. */ |
| 0 | 234 |
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235 /* Exit conditional. */ |
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236 if (body[i] == exit->src && stmt == last_stmt (exit->src)) |
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237 { |
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238 if (dump_file && (dump_flags & TDF_DETAILS)) |
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239 fprintf (dump_file, " Exit condition will be eliminated.\n"); |
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240 likely_eliminated = true; |
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241 } |
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242 /* Sets of IV variables */ |
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243 else if (gimple_code (stmt) == GIMPLE_ASSIGN |
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244 && constant_after_peeling (gimple_assign_lhs (stmt), stmt, loop)) |
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245 { |
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246 if (dump_file && (dump_flags & TDF_DETAILS)) |
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247 fprintf (dump_file, " Induction variable computation will" |
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248 " be folded away.\n"); |
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249 likely_eliminated = true; |
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250 } |
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251 /* Assignments of IV variables. */ |
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252 else if (gimple_code (stmt) == GIMPLE_ASSIGN |
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253 && TREE_CODE (gimple_assign_lhs (stmt)) == SSA_NAME |
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254 && constant_after_peeling (gimple_assign_rhs1 (stmt), stmt,loop) |
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255 && (gimple_assign_rhs_class (stmt) != GIMPLE_BINARY_RHS |
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256 || constant_after_peeling (gimple_assign_rhs2 (stmt), |
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257 stmt, loop))) |
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258 { |
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259 if (dump_file && (dump_flags & TDF_DETAILS)) |
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260 fprintf (dump_file, " Constant expression will be folded away.\n"); |
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261 likely_eliminated = true; |
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262 } |
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263 /* Conditionals. */ |
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264 else if (gimple_code (stmt) == GIMPLE_COND |
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265 && constant_after_peeling (gimple_cond_lhs (stmt), stmt, loop) |
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266 && constant_after_peeling (gimple_cond_rhs (stmt), stmt, loop)) |
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267 { |
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268 if (dump_file && (dump_flags & TDF_DETAILS)) |
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269 fprintf (dump_file, " Constant conditional.\n"); |
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270 likely_eliminated = true; |
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271 } |
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272 |
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273 size->overall += num; |
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274 if (likely_eliminated) |
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275 size->eliminated_by_peeling += num; |
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276 if (!after_exit) |
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277 { |
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278 size->last_iteration += num; |
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279 if (likely_eliminated) |
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280 size->last_iteration_eliminated_by_peeling += num; |
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281 } |
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282 } |
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283 } |
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284 if (dump_file && (dump_flags & TDF_DETAILS)) |
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285 fprintf (dump_file, "size: %i-%i, last_iteration: %i-%i\n", size->overall, |
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286 size->eliminated_by_peeling, size->last_iteration, |
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287 size->last_iteration_eliminated_by_peeling); |
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288 |
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289 free (body); |
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290 } |
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291 |
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292 /* Estimate number of insns of completely unrolled loop. |
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293 It is (NUNROLL + 1) * size of loop body with taking into account |
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294 the fact that in last copy everything after exit conditional |
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295 is dead and that some instructions will be eliminated after |
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296 peeling. |
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297 |
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298 Loop body is likely going to simplify futher, this is difficult |
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299 to guess, we just decrease the result by 1/3. */ |
| 0 | 300 |
| 301 static unsigned HOST_WIDE_INT | |
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302 estimated_unrolled_size (struct loop_size *size, |
| 0 | 303 unsigned HOST_WIDE_INT nunroll) |
| 304 { | |
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305 HOST_WIDE_INT unr_insns = ((nunroll) |
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306 * (HOST_WIDE_INT) (size->overall |
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307 - size->eliminated_by_peeling)); |
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308 if (!nunroll) |
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309 unr_insns = 0; |
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310 unr_insns += size->last_iteration - size->last_iteration_eliminated_by_peeling; |
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311 |
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312 unr_insns = unr_insns * 2 / 3; |
| 0 | 313 if (unr_insns <= 0) |
| 314 unr_insns = 1; | |
| 315 | |
| 316 return unr_insns; | |
| 317 } | |
| 318 | |
| 319 /* Tries to unroll LOOP completely, i.e. NITER times. | |
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320 UL determines which loops we are allowed to unroll. |
| 0 | 321 EXIT is the exit of the loop that should be eliminated. */ |
| 322 | |
| 323 static bool | |
| 324 try_unroll_loop_completely (struct loop *loop, | |
| 325 edge exit, tree niter, | |
| 326 enum unroll_level ul) | |
| 327 { | |
| 328 unsigned HOST_WIDE_INT n_unroll, ninsns, max_unroll, unr_insns; | |
| 329 gimple cond; | |
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330 struct loop_size size; |
| 0 | 331 |
| 332 if (loop->inner) | |
| 333 return false; | |
| 334 | |
| 335 if (!host_integerp (niter, 1)) | |
| 336 return false; | |
| 337 n_unroll = tree_low_cst (niter, 1); | |
| 338 | |
| 339 max_unroll = PARAM_VALUE (PARAM_MAX_COMPLETELY_PEEL_TIMES); | |
| 340 if (n_unroll > max_unroll) | |
| 341 return false; | |
| 342 | |
| 343 if (n_unroll) | |
| 344 { | |
| 345 if (ul == UL_SINGLE_ITER) | |
| 346 return false; | |
| 347 | |
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348 tree_estimate_loop_size (loop, exit, &size); |
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349 ninsns = size.overall; |
| 0 | 350 |
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351 unr_insns = estimated_unrolled_size (&size, n_unroll); |
| 0 | 352 if (dump_file && (dump_flags & TDF_DETAILS)) |
| 353 { | |
| 354 fprintf (dump_file, " Loop size: %d\n", (int) ninsns); | |
| 355 fprintf (dump_file, " Estimated size after unrolling: %d\n", | |
| 356 (int) unr_insns); | |
| 357 } | |
| 358 | |
| 359 if (unr_insns > ninsns | |
| 360 && (unr_insns | |
| 361 > (unsigned) PARAM_VALUE (PARAM_MAX_COMPLETELY_PEELED_INSNS))) | |
| 362 { | |
| 363 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 364 fprintf (dump_file, "Not unrolling loop %d " | |
| 365 "(--param max-completely-peeled-insns limit reached).\n", | |
| 366 loop->num); | |
| 367 return false; | |
| 368 } | |
| 369 | |
| 370 if (ul == UL_NO_GROWTH | |
| 371 && unr_insns > ninsns) | |
| 372 { | |
| 373 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 374 fprintf (dump_file, "Not unrolling loop %d.\n", loop->num); | |
| 375 return false; | |
| 376 } | |
| 377 } | |
| 378 | |
| 379 if (n_unroll) | |
| 380 { | |
| 381 sbitmap wont_exit; | |
| 382 edge e; | |
| 383 unsigned i; | |
| 384 VEC (edge, heap) *to_remove = NULL; | |
| 385 | |
| 386 initialize_original_copy_tables (); | |
| 387 wont_exit = sbitmap_alloc (n_unroll + 1); | |
| 388 sbitmap_ones (wont_exit); | |
| 389 RESET_BIT (wont_exit, 0); | |
| 390 | |
| 391 if (!gimple_duplicate_loop_to_header_edge (loop, loop_preheader_edge (loop), | |
| 392 n_unroll, wont_exit, | |
| 393 exit, &to_remove, | |
| 394 DLTHE_FLAG_UPDATE_FREQ | |
| 395 | DLTHE_FLAG_COMPLETTE_PEEL)) | |
| 396 { | |
| 397 free_original_copy_tables (); | |
| 398 free (wont_exit); | |
| 399 return false; | |
| 400 } | |
| 401 | |
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402 FOR_EACH_VEC_ELT (edge, to_remove, i, e) |
| 0 | 403 { |
| 404 bool ok = remove_path (e); | |
| 405 gcc_assert (ok); | |
| 406 } | |
| 407 | |
| 408 VEC_free (edge, heap, to_remove); | |
| 409 free (wont_exit); | |
| 410 free_original_copy_tables (); | |
| 411 } | |
| 412 | |
| 413 cond = last_stmt (exit->src); | |
| 414 if (exit->flags & EDGE_TRUE_VALUE) | |
| 415 gimple_cond_make_true (cond); | |
| 416 else | |
| 417 gimple_cond_make_false (cond); | |
| 418 update_stmt (cond); | |
| 419 update_ssa (TODO_update_ssa); | |
| 420 | |
| 421 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 422 fprintf (dump_file, "Unrolled loop %d completely.\n", loop->num); | |
| 423 | |
| 424 return true; | |
| 425 } | |
| 426 | |
| 427 /* Adds a canonical induction variable to LOOP if suitable. | |
|
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428 CREATE_IV is true if we may create a new iv. UL determines |
| 0 | 429 which loops we are allowed to completely unroll. If TRY_EVAL is true, we try |
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430 to determine the number of iterations of a loop by direct evaluation. |
| 0 | 431 Returns true if cfg is changed. */ |
| 432 | |
| 433 static bool | |
| 434 canonicalize_loop_induction_variables (struct loop *loop, | |
| 435 bool create_iv, enum unroll_level ul, | |
| 436 bool try_eval) | |
| 437 { | |
| 438 edge exit = NULL; | |
| 439 tree niter; | |
| 440 | |
| 441 niter = number_of_latch_executions (loop); | |
| 442 if (TREE_CODE (niter) == INTEGER_CST) | |
| 443 { | |
| 444 exit = single_exit (loop); | |
| 445 if (!just_once_each_iteration_p (loop, exit->src)) | |
| 446 return false; | |
| 447 } | |
| 448 else | |
| 449 { | |
| 450 /* If the loop has more than one exit, try checking all of them | |
| 451 for # of iterations determinable through scev. */ | |
| 452 if (!single_exit (loop)) | |
| 453 niter = find_loop_niter (loop, &exit); | |
| 454 | |
| 455 /* Finally if everything else fails, try brute force evaluation. */ | |
| 456 if (try_eval | |
| 457 && (chrec_contains_undetermined (niter) | |
| 458 || TREE_CODE (niter) != INTEGER_CST)) | |
| 459 niter = find_loop_niter_by_eval (loop, &exit); | |
| 460 | |
| 461 if (chrec_contains_undetermined (niter) | |
| 462 || TREE_CODE (niter) != INTEGER_CST) | |
| 463 return false; | |
| 464 } | |
| 465 | |
| 466 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 467 { | |
| 468 fprintf (dump_file, "Loop %d iterates ", loop->num); | |
| 469 print_generic_expr (dump_file, niter, TDF_SLIM); | |
| 470 fprintf (dump_file, " times.\n"); | |
| 471 } | |
| 472 | |
| 473 if (try_unroll_loop_completely (loop, exit, niter, ul)) | |
| 474 return true; | |
| 475 | |
| 476 if (create_iv) | |
| 477 create_canonical_iv (loop, exit, niter); | |
| 478 | |
| 479 return false; | |
| 480 } | |
| 481 | |
| 482 /* The main entry point of the pass. Adds canonical induction variables | |
| 483 to the suitable loops. */ | |
| 484 | |
| 485 unsigned int | |
| 486 canonicalize_induction_variables (void) | |
| 487 { | |
| 488 loop_iterator li; | |
| 489 struct loop *loop; | |
| 490 bool changed = false; | |
|
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491 |
| 0 | 492 FOR_EACH_LOOP (li, loop, 0) |
| 493 { | |
| 494 changed |= canonicalize_loop_induction_variables (loop, | |
| 495 true, UL_SINGLE_ITER, | |
| 496 true); | |
| 497 } | |
| 498 | |
| 499 /* Clean up the information about numbers of iterations, since brute force | |
| 500 evaluation could reveal new information. */ | |
| 501 scev_reset (); | |
| 502 | |
| 503 if (changed) | |
| 504 return TODO_cleanup_cfg; | |
| 505 return 0; | |
| 506 } | |
| 507 | |
| 508 /* Unroll LOOPS completely if they iterate just few times. Unless | |
| 509 MAY_INCREASE_SIZE is true, perform the unrolling only if the | |
| 510 size of the code does not increase. */ | |
| 511 | |
| 512 unsigned int | |
| 513 tree_unroll_loops_completely (bool may_increase_size, bool unroll_outer) | |
| 514 { | |
| 515 loop_iterator li; | |
| 516 struct loop *loop; | |
| 517 bool changed; | |
| 518 enum unroll_level ul; | |
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519 int iteration = 0; |
| 0 | 520 |
| 521 do | |
| 522 { | |
| 523 changed = false; | |
| 524 | |
| 525 FOR_EACH_LOOP (li, loop, LI_ONLY_INNERMOST) | |
| 526 { | |
| 527 if (may_increase_size && optimize_loop_for_speed_p (loop) | |
| 528 /* Unroll outermost loops only if asked to do so or they do | |
| 529 not cause code growth. */ | |
| 530 && (unroll_outer | |
| 531 || loop_outer (loop_outer (loop)))) | |
| 532 ul = UL_ALL; | |
| 533 else | |
| 534 ul = UL_NO_GROWTH; | |
| 535 changed |= canonicalize_loop_induction_variables | |
| 536 (loop, false, ul, !flag_tree_loop_ivcanon); | |
| 537 } | |
| 538 | |
| 539 if (changed) | |
| 540 { | |
| 541 /* This will take care of removing completely unrolled loops | |
| 542 from the loop structures so we can continue unrolling now | |
| 543 innermost loops. */ | |
| 544 if (cleanup_tree_cfg ()) | |
| 545 update_ssa (TODO_update_ssa_only_virtuals); | |
| 546 | |
| 547 /* Clean up the information about numbers of iterations, since | |
| 548 complete unrolling might have invalidated it. */ | |
| 549 scev_reset (); | |
| 550 } | |
| 551 } | |
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552 while (changed |
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553 && ++iteration <= PARAM_VALUE (PARAM_MAX_UNROLL_ITERATIONS)); |
| 0 | 554 |
| 555 return 0; | |
| 556 } |