Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-outof-ssa.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 /* Convert a program in SSA form into Normal form. |
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2 Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
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3 Free Software Foundation, Inc. |
| 0 | 4 Contributed by Andrew Macleod <amacleod@redhat.com> |
| 5 | |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify | |
| 9 it under the terms of the GNU General Public License as published by | |
| 10 the Free Software Foundation; either version 3, or (at your option) | |
| 11 any later version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, | |
| 14 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 GNU General Public License for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
| 22 #include "config.h" | |
| 23 #include "system.h" | |
| 24 #include "coretypes.h" | |
| 25 #include "tm.h" | |
| 26 #include "tree.h" | |
| 27 #include "ggc.h" | |
| 28 #include "basic-block.h" | |
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29 #include "tree-pretty-print.h" |
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30 #include "gimple-pretty-print.h" |
| 0 | 31 #include "bitmap.h" |
| 32 #include "tree-flow.h" | |
| 33 #include "timevar.h" | |
| 34 #include "tree-dump.h" | |
| 35 #include "tree-pass.h" | |
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36 #include "diagnostic-core.h" |
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37 #include "ssaexpand.h" |
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38 |
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39 /* FIXME: A lot of code here deals with expanding to RTL. All that code |
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40 should be in cfgexpand.c. */ |
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41 #include "expr.h" |
| 0 | 42 |
| 43 | |
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44 DEF_VEC_I(source_location); |
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45 DEF_VEC_ALLOC_I(source_location,heap); |
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46 |
| 0 | 47 /* Used to hold all the components required to do SSA PHI elimination. |
| 48 The node and pred/succ list is a simple linear list of nodes and | |
| 49 edges represented as pairs of nodes. | |
| 50 | |
| 51 The predecessor and successor list: Nodes are entered in pairs, where | |
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52 [0] ->PRED, [1]->SUCC. All the even indexes in the array represent |
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53 predecessors, all the odd elements are successors. |
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54 |
| 0 | 55 Rationale: |
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56 When implemented as bitmaps, very large programs SSA->Normal times were |
| 0 | 57 being dominated by clearing the interference graph. |
| 58 | |
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59 Typically this list of edges is extremely small since it only includes |
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60 PHI results and uses from a single edge which have not coalesced with |
| 0 | 61 each other. This means that no virtual PHI nodes are included, and |
| 62 empirical evidence suggests that the number of edges rarely exceed | |
| 63 3, and in a bootstrap of GCC, the maximum size encountered was 7. | |
| 64 This also limits the number of possible nodes that are involved to | |
| 65 rarely more than 6, and in the bootstrap of gcc, the maximum number | |
| 66 of nodes encountered was 12. */ | |
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67 |
| 0 | 68 typedef struct _elim_graph { |
| 69 /* Size of the elimination vectors. */ | |
| 70 int size; | |
| 71 | |
| 72 /* List of nodes in the elimination graph. */ | |
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73 VEC(int,heap) *nodes; |
| 0 | 74 |
| 75 /* The predecessor and successor edge list. */ | |
| 76 VEC(int,heap) *edge_list; | |
| 77 | |
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78 /* Source locus on each edge */ |
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79 VEC(source_location,heap) *edge_locus; |
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80 |
| 0 | 81 /* Visited vector. */ |
| 82 sbitmap visited; | |
| 83 | |
| 84 /* Stack for visited nodes. */ | |
| 85 VEC(int,heap) *stack; | |
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86 |
| 0 | 87 /* The variable partition map. */ |
| 88 var_map map; | |
| 89 | |
| 90 /* Edge being eliminated by this graph. */ | |
| 91 edge e; | |
| 92 | |
| 93 /* List of constant copies to emit. These are pushed on in pairs. */ | |
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94 VEC(int,heap) *const_dests; |
| 0 | 95 VEC(tree,heap) *const_copies; |
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96 |
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97 /* Source locations for any constant copies. */ |
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98 VEC(source_location,heap) *copy_locus; |
| 0 | 99 } *elim_graph; |
| 100 | |
| 101 | |
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102 /* For an edge E find out a good source location to associate with |
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103 instructions inserted on edge E. If E has an implicit goto set, |
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104 use its location. Otherwise search instructions in predecessors |
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105 of E for a location, and use that one. That makes sense because |
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106 we insert on edges for PHI nodes, and effects of PHIs happen on |
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107 the end of the predecessor conceptually. */ |
| 0 | 108 |
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109 static void |
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110 set_location_for_edge (edge e) |
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111 { |
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112 if (e->goto_locus) |
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113 { |
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114 set_curr_insn_source_location (e->goto_locus); |
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115 set_curr_insn_block (e->goto_block); |
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116 } |
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117 else |
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118 { |
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119 basic_block bb = e->src; |
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120 gimple_stmt_iterator gsi; |
| 0 | 121 |
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122 do |
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123 { |
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124 for (gsi = gsi_last_bb (bb); !gsi_end_p (gsi); gsi_prev (&gsi)) |
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125 { |
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126 gimple stmt = gsi_stmt (gsi); |
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127 if (is_gimple_debug (stmt)) |
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128 continue; |
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129 if (gimple_has_location (stmt) || gimple_block (stmt)) |
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130 { |
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131 set_curr_insn_source_location (gimple_location (stmt)); |
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132 set_curr_insn_block (gimple_block (stmt)); |
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133 return; |
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134 } |
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135 } |
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136 /* Nothing found in this basic block. Make a half-assed attempt |
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137 to continue with another block. */ |
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138 if (single_pred_p (bb)) |
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139 bb = single_pred (bb); |
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140 else |
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141 bb = e->src; |
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142 } |
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143 while (bb != e->src); |
| 0 | 144 } |
| 145 } | |
| 146 | |
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147 /* Emit insns to copy SRC into DEST converting SRC if necessary. As |
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148 SRC/DEST might be BLKmode memory locations SIZEEXP is a tree from |
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149 which we deduce the size to copy in that case. */ |
| 0 | 150 |
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151 static inline rtx |
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152 emit_partition_copy (rtx dest, rtx src, int unsignedsrcp, tree sizeexp) |
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153 { |
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154 rtx seq; |
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155 |
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156 start_sequence (); |
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157 |
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158 if (GET_MODE (src) != VOIDmode && GET_MODE (src) != GET_MODE (dest)) |
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159 src = convert_to_mode (GET_MODE (dest), src, unsignedsrcp); |
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160 if (GET_MODE (src) == BLKmode) |
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161 { |
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162 gcc_assert (GET_MODE (dest) == BLKmode); |
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163 emit_block_move (dest, src, expr_size (sizeexp), BLOCK_OP_NORMAL); |
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164 } |
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165 else |
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166 emit_move_insn (dest, src); |
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167 |
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168 seq = get_insns (); |
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169 end_sequence (); |
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170 |
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171 return seq; |
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172 } |
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173 |
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174 /* Insert a copy instruction from partition SRC to DEST onto edge E. */ |
| 0 | 175 |
| 176 static void | |
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177 insert_partition_copy_on_edge (edge e, int dest, int src, source_location locus) |
| 0 | 178 { |
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179 tree var; |
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180 rtx seq; |
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181 if (dump_file && (dump_flags & TDF_DETAILS)) |
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182 { |
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183 fprintf (dump_file, |
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184 "Inserting a partition copy on edge BB%d->BB%d :" |
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185 "PART.%d = PART.%d", |
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186 e->src->index, |
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187 e->dest->index, dest, src); |
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188 fprintf (dump_file, "\n"); |
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189 } |
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190 |
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191 gcc_assert (SA.partition_to_pseudo[dest]); |
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192 gcc_assert (SA.partition_to_pseudo[src]); |
| 0 | 193 |
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194 set_location_for_edge (e); |
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195 /* If a locus is provided, override the default. */ |
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196 if (locus) |
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197 set_curr_insn_source_location (locus); |
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198 |
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199 var = partition_to_var (SA.map, src); |
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200 seq = emit_partition_copy (SA.partition_to_pseudo[dest], |
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201 SA.partition_to_pseudo[src], |
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202 TYPE_UNSIGNED (TREE_TYPE (var)), |
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203 var); |
| 0 | 204 |
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205 insert_insn_on_edge (seq, e); |
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206 } |
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207 |
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208 /* Insert a copy instruction from expression SRC to partition DEST |
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209 onto edge E. */ |
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210 |
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211 static void |
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212 insert_value_copy_on_edge (edge e, int dest, tree src, source_location locus) |
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213 { |
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214 rtx seq, x; |
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215 enum machine_mode dest_mode, src_mode; |
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216 int unsignedp; |
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217 tree var; |
| 0 | 218 |
| 219 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 220 { | |
| 221 fprintf (dump_file, | |
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222 "Inserting a value copy on edge BB%d->BB%d : PART.%d = ", |
| 0 | 223 e->src->index, |
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224 e->dest->index, dest); |
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225 print_generic_expr (dump_file, src, TDF_SLIM); |
| 0 | 226 fprintf (dump_file, "\n"); |
| 227 } | |
| 228 | |
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229 gcc_assert (SA.partition_to_pseudo[dest]); |
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230 |
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231 set_location_for_edge (e); |
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232 /* If a locus is provided, override the default. */ |
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233 if (locus) |
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234 set_curr_insn_source_location (locus); |
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235 |
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236 start_sequence (); |
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237 |
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238 var = SSA_NAME_VAR (partition_to_var (SA.map, dest)); |
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239 src_mode = TYPE_MODE (TREE_TYPE (src)); |
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240 dest_mode = promote_decl_mode (var, &unsignedp); |
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241 gcc_assert (src_mode == TYPE_MODE (TREE_TYPE (var))); |
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242 gcc_assert (dest_mode == GET_MODE (SA.partition_to_pseudo[dest])); |
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243 |
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244 if (src_mode != dest_mode) |
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245 { |
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246 x = expand_expr (src, NULL, src_mode, EXPAND_NORMAL); |
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247 x = convert_modes (dest_mode, src_mode, x, unsignedp); |
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248 } |
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249 else if (src_mode == BLKmode) |
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250 { |
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251 x = SA.partition_to_pseudo[dest]; |
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252 store_expr (src, x, 0, false); |
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253 } |
|
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254 else |
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255 x = expand_expr (src, SA.partition_to_pseudo[dest], |
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256 dest_mode, EXPAND_NORMAL); |
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257 |
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258 if (x != SA.partition_to_pseudo[dest]) |
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259 emit_move_insn (SA.partition_to_pseudo[dest], x); |
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260 seq = get_insns (); |
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261 end_sequence (); |
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262 |
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263 insert_insn_on_edge (seq, e); |
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264 } |
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265 |
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266 /* Insert a copy instruction from RTL expression SRC to partition DEST |
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267 onto edge E. */ |
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268 |
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269 static void |
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270 insert_rtx_to_part_on_edge (edge e, int dest, rtx src, int unsignedsrcp, |
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271 source_location locus) |
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272 { |
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273 rtx seq; |
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274 if (dump_file && (dump_flags & TDF_DETAILS)) |
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275 { |
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276 fprintf (dump_file, |
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277 "Inserting a temp copy on edge BB%d->BB%d : PART.%d = ", |
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278 e->src->index, |
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279 e->dest->index, dest); |
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280 print_simple_rtl (dump_file, src); |
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281 fprintf (dump_file, "\n"); |
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282 } |
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283 |
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284 gcc_assert (SA.partition_to_pseudo[dest]); |
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285 |
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286 set_location_for_edge (e); |
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287 /* If a locus is provided, override the default. */ |
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288 if (locus) |
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289 set_curr_insn_source_location (locus); |
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290 |
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291 /* We give the destination as sizeexp in case src/dest are BLKmode |
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292 mems. Usually we give the source. As we result from SSA names |
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293 the left and right size should be the same (and no WITH_SIZE_EXPR |
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294 involved), so it doesn't matter. */ |
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295 seq = emit_partition_copy (SA.partition_to_pseudo[dest], |
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296 src, unsignedsrcp, |
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297 partition_to_var (SA.map, dest)); |
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298 |
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299 insert_insn_on_edge (seq, e); |
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300 } |
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301 |
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302 /* Insert a copy instruction from partition SRC to RTL lvalue DEST |
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303 onto edge E. */ |
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304 |
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305 static void |
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306 insert_part_to_rtx_on_edge (edge e, rtx dest, int src, source_location locus) |
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307 { |
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308 tree var; |
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309 rtx seq; |
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310 if (dump_file && (dump_flags & TDF_DETAILS)) |
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311 { |
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312 fprintf (dump_file, |
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313 "Inserting a temp copy on edge BB%d->BB%d : ", |
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314 e->src->index, |
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315 e->dest->index); |
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316 print_simple_rtl (dump_file, dest); |
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317 fprintf (dump_file, "= PART.%d\n", src); |
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318 } |
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319 |
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320 gcc_assert (SA.partition_to_pseudo[src]); |
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321 |
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322 set_location_for_edge (e); |
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323 /* If a locus is provided, override the default. */ |
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324 if (locus) |
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325 set_curr_insn_source_location (locus); |
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326 |
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327 var = partition_to_var (SA.map, src); |
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328 seq = emit_partition_copy (dest, |
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329 SA.partition_to_pseudo[src], |
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330 TYPE_UNSIGNED (TREE_TYPE (var)), |
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331 var); |
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332 |
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333 insert_insn_on_edge (seq, e); |
| 0 | 334 } |
| 335 | |
| 336 | |
| 337 /* Create an elimination graph with SIZE nodes and associated data | |
| 338 structures. */ | |
| 339 | |
| 340 static elim_graph | |
| 341 new_elim_graph (int size) | |
| 342 { | |
| 343 elim_graph g = (elim_graph) xmalloc (sizeof (struct _elim_graph)); | |
| 344 | |
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345 g->nodes = VEC_alloc (int, heap, 30); |
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346 g->const_dests = VEC_alloc (int, heap, 20); |
| 0 | 347 g->const_copies = VEC_alloc (tree, heap, 20); |
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348 g->copy_locus = VEC_alloc (source_location, heap, 10); |
| 0 | 349 g->edge_list = VEC_alloc (int, heap, 20); |
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350 g->edge_locus = VEC_alloc (source_location, heap, 10); |
| 0 | 351 g->stack = VEC_alloc (int, heap, 30); |
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352 |
| 0 | 353 g->visited = sbitmap_alloc (size); |
| 354 | |
| 355 return g; | |
| 356 } | |
| 357 | |
| 358 | |
| 359 /* Empty elimination graph G. */ | |
| 360 | |
| 361 static inline void | |
| 362 clear_elim_graph (elim_graph g) | |
| 363 { | |
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364 VEC_truncate (int, g->nodes, 0); |
| 0 | 365 VEC_truncate (int, g->edge_list, 0); |
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366 VEC_truncate (source_location, g->edge_locus, 0); |
| 0 | 367 } |
| 368 | |
| 369 | |
| 370 /* Delete elimination graph G. */ | |
| 371 | |
| 372 static inline void | |
| 373 delete_elim_graph (elim_graph g) | |
| 374 { | |
| 375 sbitmap_free (g->visited); | |
| 376 VEC_free (int, heap, g->stack); | |
| 377 VEC_free (int, heap, g->edge_list); | |
| 378 VEC_free (tree, heap, g->const_copies); | |
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379 VEC_free (int, heap, g->const_dests); |
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380 VEC_free (int, heap, g->nodes); |
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381 VEC_free (source_location, heap, g->copy_locus); |
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382 VEC_free (source_location, heap, g->edge_locus); |
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383 |
| 0 | 384 free (g); |
| 385 } | |
| 386 | |
| 387 | |
| 388 /* Return the number of nodes in graph G. */ | |
| 389 | |
| 390 static inline int | |
| 391 elim_graph_size (elim_graph g) | |
| 392 { | |
|
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393 return VEC_length (int, g->nodes); |
| 0 | 394 } |
| 395 | |
| 396 | |
| 397 /* Add NODE to graph G, if it doesn't exist already. */ | |
| 398 | |
|
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399 static inline void |
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400 elim_graph_add_node (elim_graph g, int node) |
| 0 | 401 { |
| 402 int x; | |
|
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403 int t; |
| 0 | 404 |
|
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405 FOR_EACH_VEC_ELT (int, g->nodes, x, t) |
| 0 | 406 if (t == node) |
| 407 return; | |
|
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408 VEC_safe_push (int, heap, g->nodes, node); |
| 0 | 409 } |
| 410 | |
| 411 | |
| 412 /* Add the edge PRED->SUCC to graph G. */ | |
| 413 | |
| 414 static inline void | |
|
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415 elim_graph_add_edge (elim_graph g, int pred, int succ, source_location locus) |
| 0 | 416 { |
| 417 VEC_safe_push (int, heap, g->edge_list, pred); | |
| 418 VEC_safe_push (int, heap, g->edge_list, succ); | |
|
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419 VEC_safe_push (source_location, heap, g->edge_locus, locus); |
| 0 | 420 } |
| 421 | |
| 422 | |
| 423 /* Remove an edge from graph G for which NODE is the predecessor, and | |
| 424 return the successor node. -1 is returned if there is no such edge. */ | |
| 425 | |
| 426 static inline int | |
|
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427 elim_graph_remove_succ_edge (elim_graph g, int node, source_location *locus) |
| 0 | 428 { |
| 429 int y; | |
| 430 unsigned x; | |
| 431 for (x = 0; x < VEC_length (int, g->edge_list); x += 2) | |
| 432 if (VEC_index (int, g->edge_list, x) == node) | |
| 433 { | |
| 434 VEC_replace (int, g->edge_list, x, -1); | |
| 435 y = VEC_index (int, g->edge_list, x + 1); | |
| 436 VEC_replace (int, g->edge_list, x + 1, -1); | |
|
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437 *locus = VEC_index (source_location, g->edge_locus, x / 2); |
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438 VEC_replace (source_location, g->edge_locus, x / 2, UNKNOWN_LOCATION); |
| 0 | 439 return y; |
| 440 } | |
|
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441 *locus = UNKNOWN_LOCATION; |
| 0 | 442 return -1; |
| 443 } | |
| 444 | |
| 445 | |
| 446 /* Find all the nodes in GRAPH which are successors to NODE in the | |
| 447 edge list. VAR will hold the partition number found. CODE is the | |
| 448 code fragment executed for every node found. */ | |
| 449 | |
|
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450 #define FOR_EACH_ELIM_GRAPH_SUCC(GRAPH, NODE, VAR, LOCUS, CODE) \ |
| 0 | 451 do { \ |
| 452 unsigned x_; \ | |
| 453 int y_; \ | |
| 454 for (x_ = 0; x_ < VEC_length (int, (GRAPH)->edge_list); x_ += 2) \ | |
| 455 { \ | |
| 456 y_ = VEC_index (int, (GRAPH)->edge_list, x_); \ | |
| 457 if (y_ != (NODE)) \ | |
| 458 continue; \ | |
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459 (void) ((VAR) = VEC_index (int, (GRAPH)->edge_list, x_ + 1)); \ |
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460 (void) ((LOCUS) = VEC_index (source_location, \ |
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461 (GRAPH)->edge_locus, x_ / 2)); \ |
| 0 | 462 CODE; \ |
| 463 } \ | |
| 464 } while (0) | |
| 465 | |
| 466 | |
| 467 /* Find all the nodes which are predecessors of NODE in the edge list for | |
| 468 GRAPH. VAR will hold the partition number found. CODE is the | |
| 469 code fragment executed for every node found. */ | |
| 470 | |
|
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471 #define FOR_EACH_ELIM_GRAPH_PRED(GRAPH, NODE, VAR, LOCUS, CODE) \ |
| 0 | 472 do { \ |
| 473 unsigned x_; \ | |
| 474 int y_; \ | |
| 475 for (x_ = 0; x_ < VEC_length (int, (GRAPH)->edge_list); x_ += 2) \ | |
| 476 { \ | |
| 477 y_ = VEC_index (int, (GRAPH)->edge_list, x_ + 1); \ | |
| 478 if (y_ != (NODE)) \ | |
| 479 continue; \ | |
|
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480 (void) ((VAR) = VEC_index (int, (GRAPH)->edge_list, x_)); \ |
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481 (void) ((LOCUS) = VEC_index (source_location, \ |
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482 (GRAPH)->edge_locus, x_ / 2)); \ |
| 0 | 483 CODE; \ |
| 484 } \ | |
| 485 } while (0) | |
| 486 | |
| 487 | |
| 488 /* Add T to elimination graph G. */ | |
| 489 | |
| 490 static inline void | |
|
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491 eliminate_name (elim_graph g, int T) |
| 0 | 492 { |
| 493 elim_graph_add_node (g, T); | |
| 494 } | |
| 495 | |
| 496 | |
| 497 /* Build elimination graph G for basic block BB on incoming PHI edge | |
| 498 G->e. */ | |
| 499 | |
| 500 static void | |
|
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501 eliminate_build (elim_graph g) |
| 0 | 502 { |
|
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503 tree Ti; |
| 0 | 504 int p0, pi; |
| 505 gimple_stmt_iterator gsi; | |
| 506 | |
| 507 clear_elim_graph (g); | |
|
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508 |
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509 for (gsi = gsi_start_phis (g->e->dest); !gsi_end_p (gsi); gsi_next (&gsi)) |
| 0 | 510 { |
| 511 gimple phi = gsi_stmt (gsi); | |
|
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512 source_location locus; |
| 0 | 513 |
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514 p0 = var_to_partition (g->map, gimple_phi_result (phi)); |
| 0 | 515 /* Ignore results which are not in partitions. */ |
|
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516 if (p0 == NO_PARTITION) |
| 0 | 517 continue; |
| 518 | |
| 519 Ti = PHI_ARG_DEF (phi, g->e->dest_idx); | |
|
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520 locus = gimple_phi_arg_location_from_edge (phi, g->e); |
| 0 | 521 |
| 522 /* If this argument is a constant, or a SSA_NAME which is being | |
| 523 left in SSA form, just queue a copy to be emitted on this | |
| 524 edge. */ | |
| 525 if (!phi_ssa_name_p (Ti) | |
| 526 || (TREE_CODE (Ti) == SSA_NAME | |
| 527 && var_to_partition (g->map, Ti) == NO_PARTITION)) | |
| 528 { | |
| 529 /* Save constant copies until all other copies have been emitted | |
| 530 on this edge. */ | |
|
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531 VEC_safe_push (int, heap, g->const_dests, p0); |
| 0 | 532 VEC_safe_push (tree, heap, g->const_copies, Ti); |
|
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533 VEC_safe_push (source_location, heap, g->copy_locus, locus); |
| 0 | 534 } |
| 535 else | |
| 536 { | |
|
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537 pi = var_to_partition (g->map, Ti); |
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538 if (p0 != pi) |
| 0 | 539 { |
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540 eliminate_name (g, p0); |
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541 eliminate_name (g, pi); |
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542 elim_graph_add_edge (g, p0, pi, locus); |
| 0 | 543 } |
| 544 } | |
| 545 } | |
| 546 } | |
| 547 | |
| 548 | |
| 549 /* Push successors of T onto the elimination stack for G. */ | |
| 550 | |
|
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551 static void |
| 0 | 552 elim_forward (elim_graph g, int T) |
| 553 { | |
| 554 int S; | |
|
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555 source_location locus; |
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556 |
| 0 | 557 SET_BIT (g->visited, T); |
|
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558 FOR_EACH_ELIM_GRAPH_SUCC (g, T, S, locus, |
| 0 | 559 { |
| 560 if (!TEST_BIT (g->visited, S)) | |
| 561 elim_forward (g, S); | |
| 562 }); | |
| 563 VEC_safe_push (int, heap, g->stack, T); | |
| 564 } | |
| 565 | |
| 566 | |
| 567 /* Return 1 if there unvisited predecessors of T in graph G. */ | |
| 568 | |
| 569 static int | |
| 570 elim_unvisited_predecessor (elim_graph g, int T) | |
| 571 { | |
| 572 int P; | |
|
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573 source_location locus; |
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574 |
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575 FOR_EACH_ELIM_GRAPH_PRED (g, T, P, locus, |
| 0 | 576 { |
| 577 if (!TEST_BIT (g->visited, P)) | |
| 578 return 1; | |
| 579 }); | |
| 580 return 0; | |
| 581 } | |
| 582 | |
| 583 /* Process predecessors first, and insert a copy. */ | |
| 584 | |
| 585 static void | |
| 586 elim_backward (elim_graph g, int T) | |
| 587 { | |
| 588 int P; | |
|
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589 source_location locus; |
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590 |
| 0 | 591 SET_BIT (g->visited, T); |
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592 FOR_EACH_ELIM_GRAPH_PRED (g, T, P, locus, |
| 0 | 593 { |
| 594 if (!TEST_BIT (g->visited, P)) | |
| 595 { | |
| 596 elim_backward (g, P); | |
|
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597 insert_partition_copy_on_edge (g->e, P, T, locus); |
| 0 | 598 } |
| 599 }); | |
| 600 } | |
| 601 | |
|
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602 /* Allocate a new pseudo register usable for storing values sitting |
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603 in NAME (a decl or SSA name), i.e. with matching mode and attributes. */ |
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604 |
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605 static rtx |
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606 get_temp_reg (tree name) |
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607 { |
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608 tree var = TREE_CODE (name) == SSA_NAME ? SSA_NAME_VAR (name) : name; |
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609 tree type = TREE_TYPE (var); |
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610 int unsignedp; |
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611 enum machine_mode reg_mode = promote_decl_mode (var, &unsignedp); |
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612 rtx x = gen_reg_rtx (reg_mode); |
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613 if (POINTER_TYPE_P (type)) |
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614 mark_reg_pointer (x, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (var)))); |
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615 return x; |
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616 } |
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617 |
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618 /* Insert required copies for T in graph G. Check for a strongly connected |
| 0 | 619 region, and create a temporary to break the cycle if one is found. */ |
| 620 | |
|
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621 static void |
| 0 | 622 elim_create (elim_graph g, int T) |
| 623 { | |
| 624 int P, S; | |
|
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625 source_location locus; |
| 0 | 626 |
| 627 if (elim_unvisited_predecessor (g, T)) | |
| 628 { | |
|
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629 tree var = partition_to_var (g->map, T); |
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630 rtx U = get_temp_reg (var); |
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631 int unsignedsrcp = TYPE_UNSIGNED (TREE_TYPE (var)); |
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632 |
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633 insert_part_to_rtx_on_edge (g->e, U, T, UNKNOWN_LOCATION); |
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634 FOR_EACH_ELIM_GRAPH_PRED (g, T, P, locus, |
| 0 | 635 { |
| 636 if (!TEST_BIT (g->visited, P)) | |
| 637 { | |
| 638 elim_backward (g, P); | |
|
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639 insert_rtx_to_part_on_edge (g->e, P, U, unsignedsrcp, locus); |
| 0 | 640 } |
| 641 }); | |
| 642 } | |
| 643 else | |
| 644 { | |
|
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645 S = elim_graph_remove_succ_edge (g, T, &locus); |
| 0 | 646 if (S != -1) |
| 647 { | |
| 648 SET_BIT (g->visited, T); | |
|
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649 insert_partition_copy_on_edge (g->e, T, S, locus); |
| 0 | 650 } |
| 651 } | |
| 652 } | |
| 653 | |
| 654 | |
| 655 /* Eliminate all the phi nodes on edge E in graph G. */ | |
| 656 | |
| 657 static void | |
| 658 eliminate_phi (edge e, elim_graph g) | |
| 659 { | |
| 660 int x; | |
| 661 | |
| 662 gcc_assert (VEC_length (tree, g->const_copies) == 0); | |
|
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663 gcc_assert (VEC_length (source_location, g->copy_locus) == 0); |
| 0 | 664 |
| 665 /* Abnormal edges already have everything coalesced. */ | |
| 666 if (e->flags & EDGE_ABNORMAL) | |
| 667 return; | |
| 668 | |
| 669 g->e = e; | |
| 670 | |
|
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671 eliminate_build (g); |
| 0 | 672 |
| 673 if (elim_graph_size (g) != 0) | |
| 674 { | |
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675 int part; |
| 0 | 676 |
| 677 sbitmap_zero (g->visited); | |
| 678 VEC_truncate (int, g->stack, 0); | |
| 679 | |
|
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680 FOR_EACH_VEC_ELT (int, g->nodes, x, part) |
| 0 | 681 { |
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682 if (!TEST_BIT (g->visited, part)) |
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683 elim_forward (g, part); |
| 0 | 684 } |
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685 |
| 0 | 686 sbitmap_zero (g->visited); |
| 687 while (VEC_length (int, g->stack) > 0) | |
| 688 { | |
| 689 x = VEC_pop (int, g->stack); | |
| 690 if (!TEST_BIT (g->visited, x)) | |
| 691 elim_create (g, x); | |
| 692 } | |
| 693 } | |
| 694 | |
| 695 /* If there are any pending constant copies, issue them now. */ | |
| 696 while (VEC_length (tree, g->const_copies) > 0) | |
| 697 { | |
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698 int dest; |
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699 tree src; |
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700 source_location locus; |
| 0 | 701 |
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702 src = VEC_pop (tree, g->const_copies); |
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703 dest = VEC_pop (int, g->const_dests); |
|
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704 locus = VEC_pop (source_location, g->copy_locus); |
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705 insert_value_copy_on_edge (e, dest, src, locus); |
| 0 | 706 } |
| 707 } | |
| 708 | |
| 709 | |
|
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710 /* Remove each argument from PHI. If an arg was the last use of an SSA_NAME, |
| 0 | 711 check to see if this allows another PHI node to be removed. */ |
| 712 | |
| 713 static void | |
| 714 remove_gimple_phi_args (gimple phi) | |
| 715 { | |
| 716 use_operand_p arg_p; | |
| 717 ssa_op_iter iter; | |
| 718 | |
| 719 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 720 { | |
| 721 fprintf (dump_file, "Removing Dead PHI definition: "); | |
| 722 print_gimple_stmt (dump_file, phi, 0, TDF_SLIM); | |
| 723 } | |
| 724 | |
| 725 FOR_EACH_PHI_ARG (arg_p, phi, iter, SSA_OP_USE) | |
| 726 { | |
| 727 tree arg = USE_FROM_PTR (arg_p); | |
| 728 if (TREE_CODE (arg) == SSA_NAME) | |
| 729 { | |
| 730 /* Remove the reference to the existing argument. */ | |
| 731 SET_USE (arg_p, NULL_TREE); | |
| 732 if (has_zero_uses (arg)) | |
| 733 { | |
| 734 gimple stmt; | |
| 735 gimple_stmt_iterator gsi; | |
| 736 | |
| 737 stmt = SSA_NAME_DEF_STMT (arg); | |
| 738 | |
| 739 /* Also remove the def if it is a PHI node. */ | |
| 740 if (gimple_code (stmt) == GIMPLE_PHI) | |
| 741 { | |
| 742 remove_gimple_phi_args (stmt); | |
| 743 gsi = gsi_for_stmt (stmt); | |
| 744 remove_phi_node (&gsi, true); | |
| 745 } | |
| 746 | |
| 747 } | |
| 748 } | |
| 749 } | |
| 750 } | |
| 751 | |
| 752 /* Remove any PHI node which is a virtual PHI, or a PHI with no uses. */ | |
| 753 | |
| 754 static void | |
| 755 eliminate_useless_phis (void) | |
| 756 { | |
| 757 basic_block bb; | |
| 758 gimple_stmt_iterator gsi; | |
| 759 tree result; | |
| 760 | |
| 761 FOR_EACH_BB (bb) | |
| 762 { | |
| 763 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); ) | |
| 764 { | |
| 765 gimple phi = gsi_stmt (gsi); | |
| 766 result = gimple_phi_result (phi); | |
| 767 if (!is_gimple_reg (SSA_NAME_VAR (result))) | |
| 768 { | |
| 769 #ifdef ENABLE_CHECKING | |
| 770 size_t i; | |
| 771 /* There should be no arguments which are not virtual, or the | |
| 772 results will be incorrect. */ | |
| 773 for (i = 0; i < gimple_phi_num_args (phi); i++) | |
| 774 { | |
| 775 tree arg = PHI_ARG_DEF (phi, i); | |
|
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776 if (TREE_CODE (arg) == SSA_NAME |
| 0 | 777 && is_gimple_reg (SSA_NAME_VAR (arg))) |
| 778 { | |
| 779 fprintf (stderr, "Argument of PHI is not virtual ("); | |
| 780 print_generic_expr (stderr, arg, TDF_SLIM); | |
| 781 fprintf (stderr, "), but the result is :"); | |
| 782 print_gimple_stmt (stderr, phi, 0, TDF_SLIM); | |
| 783 internal_error ("SSA corruption"); | |
| 784 } | |
| 785 } | |
| 786 #endif | |
| 787 remove_phi_node (&gsi, true); | |
| 788 } | |
| 789 else | |
| 790 { | |
| 791 /* Also remove real PHIs with no uses. */ | |
| 792 if (has_zero_uses (result)) | |
| 793 { | |
| 794 remove_gimple_phi_args (phi); | |
| 795 remove_phi_node (&gsi, true); | |
| 796 } | |
| 797 else | |
| 798 gsi_next (&gsi); | |
| 799 } | |
| 800 } | |
| 801 } | |
| 802 } | |
| 803 | |
| 804 | |
| 805 /* This function will rewrite the current program using the variable mapping | |
|
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806 found in MAP. If the replacement vector VALUES is provided, any |
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807 occurrences of partitions with non-null entries in the vector will be |
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808 replaced with the expression in the vector instead of its mapped |
| 0 | 809 variable. */ |
| 810 | |
| 811 static void | |
|
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812 rewrite_trees (var_map map ATTRIBUTE_UNUSED) |
| 0 | 813 { |
|
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814 #ifdef ENABLE_CHECKING |
| 0 | 815 basic_block bb; |
| 816 /* Search for PHIs where the destination has no partition, but one | |
| 817 or more arguments has a partition. This should not happen and can | |
| 818 create incorrect code. */ | |
| 819 FOR_EACH_BB (bb) | |
| 820 { | |
|
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821 gimple_stmt_iterator gsi; |
| 0 | 822 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| 823 { | |
| 824 gimple phi = gsi_stmt (gsi); | |
| 825 tree T0 = var_to_partition_to_var (map, gimple_phi_result (phi)); | |
| 826 if (T0 == NULL_TREE) | |
| 827 { | |
| 828 size_t i; | |
| 829 for (i = 0; i < gimple_phi_num_args (phi); i++) | |
| 830 { | |
| 831 tree arg = PHI_ARG_DEF (phi, i); | |
| 832 | |
| 833 if (TREE_CODE (arg) == SSA_NAME | |
| 834 && var_to_partition (map, arg) != NO_PARTITION) | |
| 835 { | |
| 836 fprintf (stderr, "Argument of PHI is in a partition :("); | |
| 837 print_generic_expr (stderr, arg, TDF_SLIM); | |
| 838 fprintf (stderr, "), but the result is not :"); | |
| 839 print_gimple_stmt (stderr, phi, 0, TDF_SLIM); | |
| 840 internal_error ("SSA corruption"); | |
| 841 } | |
| 842 } | |
| 843 } | |
| 844 } | |
| 845 } | |
| 846 #endif | |
| 847 } | |
| 848 | |
|
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849 /* Given the out-of-ssa info object SA (with prepared partitions) |
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850 eliminate all phi nodes in all basic blocks. Afterwards no |
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851 basic block will have phi nodes anymore and there are possibly |
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852 some RTL instructions inserted on edges. */ |
| 0 | 853 |
|
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854 void |
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855 expand_phi_nodes (struct ssaexpand *sa) |
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856 { |
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857 basic_block bb; |
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858 elim_graph g = new_elim_graph (sa->map->num_partitions); |
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859 g->map = sa->map; |
| 0 | 860 |
|
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861 FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR->next_bb, EXIT_BLOCK_PTR, next_bb) |
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862 if (!gimple_seq_empty_p (phi_nodes (bb))) |
| 0 | 863 { |
|
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864 edge e; |
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865 edge_iterator ei; |
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866 FOR_EACH_EDGE (e, ei, bb->preds) |
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867 eliminate_phi (e, g); |
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868 set_phi_nodes (bb, NULL); |
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869 /* We can't redirect EH edges in RTL land, so we need to do this |
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870 here. Redirection happens only when splitting is necessary, |
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871 which it is only for critical edges, normally. For EH edges |
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872 it might also be necessary when the successor has more than |
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873 one predecessor. In that case the edge is either required to |
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874 be fallthru (which EH edges aren't), or the predecessor needs |
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875 to end with a jump (which again, isn't the case with EH edges). |
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876 Hence, split all EH edges on which we inserted instructions |
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877 and whose successor has multiple predecessors. */ |
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878 for (ei = ei_start (bb->preds); (e = ei_safe_edge (ei)); ) |
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879 { |
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880 if (e->insns.r && (e->flags & EDGE_EH) |
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881 && !single_pred_p (e->dest)) |
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882 { |
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883 rtx insns = e->insns.r; |
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884 basic_block bb; |
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885 e->insns.r = NULL_RTX; |
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886 bb = split_edge (e); |
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887 single_pred_edge (bb)->insns.r = insns; |
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888 } |
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889 else |
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890 ei_next (&ei); |
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891 } |
| 0 | 892 } |
| 893 | |
|
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894 delete_elim_graph (g); |
| 0 | 895 } |
| 896 | |
| 897 | |
| 898 /* Remove the ssa-names in the current function and translate them into normal | |
| 899 compiler variables. PERFORM_TER is true if Temporary Expression Replacement | |
| 900 should also be used. */ | |
| 901 | |
| 902 static void | |
|
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903 remove_ssa_form (bool perform_ter, struct ssaexpand *sa) |
| 0 | 904 { |
|
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905 bitmap values = NULL; |
| 0 | 906 var_map map; |
|
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907 unsigned i; |
| 0 | 908 |
| 909 map = coalesce_ssa_name (); | |
| 910 | |
| 911 /* Return to viewing the variable list as just all reference variables after | |
| 912 coalescing has been performed. */ | |
| 913 partition_view_normal (map, false); | |
| 914 | |
| 915 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 916 { | |
| 917 fprintf (dump_file, "After Coalescing:\n"); | |
| 918 dump_var_map (dump_file, map); | |
| 919 } | |
| 920 | |
| 921 if (perform_ter) | |
| 922 { | |
| 923 values = find_replaceable_exprs (map); | |
| 924 if (values && dump_file && (dump_flags & TDF_DETAILS)) | |
| 925 dump_replaceable_exprs (dump_file, values); | |
| 926 } | |
| 927 | |
|
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928 rewrite_trees (map); |
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929 |
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930 sa->map = map; |
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931 sa->values = values; |
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932 sa->partition_has_default_def = BITMAP_ALLOC (NULL); |
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933 for (i = 1; i < num_ssa_names; i++) |
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934 { |
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935 tree t = ssa_name (i); |
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936 if (t && SSA_NAME_IS_DEFAULT_DEF (t)) |
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937 { |
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938 int p = var_to_partition (map, t); |
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939 if (p != NO_PARTITION) |
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940 bitmap_set_bit (sa->partition_has_default_def, p); |
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941 } |
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942 } |
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943 } |
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|
944 |
|
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|
945 |
|
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|
946 /* If not already done so for basic block BB, assign increasing uids |
|
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|
947 to each of its instructions. */ |
|
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|
948 |
|
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|
949 static void |
|
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|
950 maybe_renumber_stmts_bb (basic_block bb) |
|
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|
951 { |
|
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|
952 unsigned i = 0; |
|
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|
953 gimple_stmt_iterator gsi; |
| 0 | 954 |
|
55
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|
955 if (!bb->aux) |
|
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|
956 return; |
|
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|
957 bb->aux = NULL; |
|
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958 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| 0 | 959 { |
|
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960 gimple stmt = gsi_stmt (gsi); |
|
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|
961 gimple_set_uid (stmt, i); |
|
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|
962 i++; |
|
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963 } |
|
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964 } |
|
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965 |
|
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|
966 |
|
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967 /* Return true if we can determine that the SSA_NAMEs RESULT (a result |
|
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968 of a PHI node) and ARG (one of its arguments) conflict. Return false |
|
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969 otherwise, also when we simply aren't sure. */ |
|
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|
970 |
|
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|
971 static bool |
|
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972 trivially_conflicts_p (basic_block bb, tree result, tree arg) |
|
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973 { |
|
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974 use_operand_p use; |
|
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975 imm_use_iterator imm_iter; |
|
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976 gimple defa = SSA_NAME_DEF_STMT (arg); |
|
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977 |
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978 /* If ARG isn't defined in the same block it's too complicated for |
|
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979 our little mind. */ |
|
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980 if (gimple_bb (defa) != bb) |
|
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|
981 return false; |
|
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|
982 |
|
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983 FOR_EACH_IMM_USE_FAST (use, imm_iter, result) |
|
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984 { |
|
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985 gimple use_stmt = USE_STMT (use); |
|
63
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986 if (is_gimple_debug (use_stmt)) |
|
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987 continue; |
|
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988 /* Now, if there's a use of RESULT that lies outside this basic block, |
|
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989 then there surely is a conflict with ARG. */ |
|
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990 if (gimple_bb (use_stmt) != bb) |
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|
991 return true; |
|
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992 if (gimple_code (use_stmt) == GIMPLE_PHI) |
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993 continue; |
|
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994 /* The use now is in a real stmt of BB, so if ARG was defined |
|
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995 in a PHI node (like RESULT) both conflict. */ |
|
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996 if (gimple_code (defa) == GIMPLE_PHI) |
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997 return true; |
|
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998 maybe_renumber_stmts_bb (bb); |
|
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999 /* If the use of RESULT occurs after the definition of ARG, |
|
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|
1000 the two conflict too. */ |
|
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1001 if (gimple_uid (defa) < gimple_uid (use_stmt)) |
|
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1002 return true; |
| 0 | 1003 } |
| 1004 | |
|
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1005 return false; |
| 0 | 1006 } |
| 1007 | |
| 1008 | |
| 1009 /* Search every PHI node for arguments associated with backedges which | |
| 1010 we can trivially determine will need a copy (the argument is either | |
| 1011 not an SSA_NAME or the argument has a different underlying variable | |
| 1012 than the PHI result). | |
| 1013 | |
| 1014 Insert a copy from the PHI argument to a new destination at the | |
| 1015 end of the block with the backedge to the top of the loop. Update | |
| 1016 the PHI argument to reference this new destination. */ | |
| 1017 | |
| 1018 static void | |
| 1019 insert_backedge_copies (void) | |
| 1020 { | |
| 1021 basic_block bb; | |
| 1022 gimple_stmt_iterator gsi; | |
| 1023 | |
| 1024 FOR_EACH_BB (bb) | |
| 1025 { | |
|
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1026 /* Mark block as possibly needing calculation of UIDs. */ |
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1027 bb->aux = &bb->aux; |
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1028 |
| 0 | 1029 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| 1030 { | |
| 1031 gimple phi = gsi_stmt (gsi); | |
| 1032 tree result = gimple_phi_result (phi); | |
| 1033 tree result_var; | |
| 1034 size_t i; | |
| 1035 | |
| 1036 if (!is_gimple_reg (result)) | |
| 1037 continue; | |
| 1038 | |
| 1039 result_var = SSA_NAME_VAR (result); | |
| 1040 for (i = 0; i < gimple_phi_num_args (phi); i++) | |
| 1041 { | |
| 1042 tree arg = gimple_phi_arg_def (phi, i); | |
| 1043 edge e = gimple_phi_arg_edge (phi, i); | |
| 1044 | |
|
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1045 /* If the argument is not an SSA_NAME, then we will need a |
| 0 | 1046 constant initialization. If the argument is an SSA_NAME with |
|
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1047 a different underlying variable then a copy statement will be |
| 0 | 1048 needed. */ |
| 1049 if ((e->flags & EDGE_DFS_BACK) | |
| 1050 && (TREE_CODE (arg) != SSA_NAME | |
|
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1051 || SSA_NAME_VAR (arg) != result_var |
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1052 || trivially_conflicts_p (bb, result, arg))) |
| 0 | 1053 { |
| 1054 tree name; | |
| 1055 gimple stmt, last = NULL; | |
| 1056 gimple_stmt_iterator gsi2; | |
| 1057 | |
| 1058 gsi2 = gsi_last_bb (gimple_phi_arg_edge (phi, i)->src); | |
| 1059 if (!gsi_end_p (gsi2)) | |
| 1060 last = gsi_stmt (gsi2); | |
| 1061 | |
| 1062 /* In theory the only way we ought to get back to the | |
| 1063 start of a loop should be with a COND_EXPR or GOTO_EXPR. | |
|
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1064 However, better safe than sorry. |
| 0 | 1065 If the block ends with a control statement or |
| 1066 something that might throw, then we have to | |
| 1067 insert this assignment before the last | |
| 1068 statement. Else insert it after the last statement. */ | |
| 1069 if (last && stmt_ends_bb_p (last)) | |
| 1070 { | |
| 1071 /* If the last statement in the block is the definition | |
| 1072 site of the PHI argument, then we can't insert | |
| 1073 anything after it. */ | |
| 1074 if (TREE_CODE (arg) == SSA_NAME | |
| 1075 && SSA_NAME_DEF_STMT (arg) == last) | |
| 1076 continue; | |
| 1077 } | |
| 1078 | |
|
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1079 /* Create a new instance of the underlying variable of the |
| 0 | 1080 PHI result. */ |
| 1081 stmt = gimple_build_assign (result_var, | |
| 1082 gimple_phi_arg_def (phi, i)); | |
| 1083 name = make_ssa_name (result_var, stmt); | |
| 1084 gimple_assign_set_lhs (stmt, name); | |
| 1085 | |
|
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|
1086 /* copy location if present. */ |
|
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|
1087 if (gimple_phi_arg_has_location (phi, i)) |
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1088 gimple_set_location (stmt, |
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1089 gimple_phi_arg_location (phi, i)); |
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1090 |
| 0 | 1091 /* Insert the new statement into the block and update |
| 1092 the PHI node. */ | |
| 1093 if (last && stmt_ends_bb_p (last)) | |
| 1094 gsi_insert_before (&gsi2, stmt, GSI_NEW_STMT); | |
| 1095 else | |
| 1096 gsi_insert_after (&gsi2, stmt, GSI_NEW_STMT); | |
| 1097 SET_PHI_ARG_DEF (phi, i, name); | |
| 1098 } | |
| 1099 } | |
| 1100 } | |
|
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|
1101 |
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|
1102 /* Unmark this block again. */ |
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1103 bb->aux = NULL; |
| 0 | 1104 } |
| 1105 } | |
| 1106 | |
|
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1107 /* Free all memory associated with going out of SSA form. SA is |
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|
1108 the outof-SSA info object. */ |
|
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1109 |
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|
1110 void |
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1111 finish_out_of_ssa (struct ssaexpand *sa) |
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1112 { |
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1113 free (sa->partition_to_pseudo); |
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1114 if (sa->values) |
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|
1115 BITMAP_FREE (sa->values); |
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1116 delete_var_map (sa->map); |
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1117 BITMAP_FREE (sa->partition_has_default_def); |
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1118 memset (sa, 0, sizeof *sa); |
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1119 } |
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1120 |
| 0 | 1121 /* Take the current function out of SSA form, translating PHIs as described in |
| 1122 R. Morgan, ``Building an Optimizing Compiler'', | |
| 1123 Butterworth-Heinemann, Boston, MA, 1998. pp 176-186. */ | |
| 1124 | |
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1125 unsigned int |
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1126 rewrite_out_of_ssa (struct ssaexpand *sa) |
| 0 | 1127 { |
| 1128 /* If elimination of a PHI requires inserting a copy on a backedge, | |
| 1129 then we will have to split the backedge which has numerous | |
| 1130 undesirable performance effects. | |
| 1131 | |
| 1132 A significant number of such cases can be handled here by inserting | |
| 1133 copies into the loop itself. */ | |
| 1134 insert_backedge_copies (); | |
| 1135 | |
| 1136 | |
| 1137 /* Eliminate PHIs which are of no use, such as virtual or dead phis. */ | |
| 1138 eliminate_useless_phis (); | |
| 1139 | |
| 1140 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1141 gimple_dump_cfg (dump_file, dump_flags & ~TDF_DETAILS); | |
| 1142 | |
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1143 remove_ssa_form (flag_tree_ter, sa); |
| 0 | 1144 |
| 1145 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1146 gimple_dump_cfg (dump_file, dump_flags & ~TDF_DETAILS); | |
| 1147 | |
| 1148 return 0; | |
| 1149 } |