Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-outof-ssa.c @ 55:77e2b8dfacca gcc-4.4.5
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| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | a06113de4d67 |
| children | b7f97abdc517 |
| rev | line source |
|---|---|
| 0 | 1 /* Convert a program in SSA form into Normal form. |
|
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2 Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 |
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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" | |
| 29 #include "diagnostic.h" | |
| 30 #include "bitmap.h" | |
| 31 #include "tree-flow.h" | |
| 32 #include "timevar.h" | |
| 33 #include "tree-dump.h" | |
| 34 #include "tree-pass.h" | |
| 35 #include "toplev.h" | |
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36 #include "expr.h" |
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37 #include "ssaexpand.h" |
| 0 | 38 |
| 39 | |
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40 DEF_VEC_I(source_location); |
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41 DEF_VEC_ALLOC_I(source_location,heap); |
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42 |
| 0 | 43 /* Used to hold all the components required to do SSA PHI elimination. |
| 44 The node and pred/succ list is a simple linear list of nodes and | |
| 45 edges represented as pairs of nodes. | |
| 46 | |
| 47 The predecessor and successor list: Nodes are entered in pairs, where | |
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48 [0] ->PRED, [1]->SUCC. All the even indexes in the array represent |
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49 predecessors, all the odd elements are successors. |
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50 |
| 0 | 51 Rationale: |
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52 When implemented as bitmaps, very large programs SSA->Normal times were |
| 0 | 53 being dominated by clearing the interference graph. |
| 54 | |
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55 Typically this list of edges is extremely small since it only includes |
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56 PHI results and uses from a single edge which have not coalesced with |
| 0 | 57 each other. This means that no virtual PHI nodes are included, and |
| 58 empirical evidence suggests that the number of edges rarely exceed | |
| 59 3, and in a bootstrap of GCC, the maximum size encountered was 7. | |
| 60 This also limits the number of possible nodes that are involved to | |
| 61 rarely more than 6, and in the bootstrap of gcc, the maximum number | |
| 62 of nodes encountered was 12. */ | |
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63 |
| 0 | 64 typedef struct _elim_graph { |
| 65 /* Size of the elimination vectors. */ | |
| 66 int size; | |
| 67 | |
| 68 /* List of nodes in the elimination graph. */ | |
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69 VEC(int,heap) *nodes; |
| 0 | 70 |
| 71 /* The predecessor and successor edge list. */ | |
| 72 VEC(int,heap) *edge_list; | |
| 73 | |
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74 /* Source locus on each edge */ |
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75 VEC(source_location,heap) *edge_locus; |
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76 |
| 0 | 77 /* Visited vector. */ |
| 78 sbitmap visited; | |
| 79 | |
| 80 /* Stack for visited nodes. */ | |
| 81 VEC(int,heap) *stack; | |
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82 |
| 0 | 83 /* The variable partition map. */ |
| 84 var_map map; | |
| 85 | |
| 86 /* Edge being eliminated by this graph. */ | |
| 87 edge e; | |
| 88 | |
| 89 /* List of constant copies to emit. These are pushed on in pairs. */ | |
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90 VEC(int,heap) *const_dests; |
| 0 | 91 VEC(tree,heap) *const_copies; |
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92 |
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93 /* Source locations for any constant copies. */ |
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94 VEC(source_location,heap) *copy_locus; |
| 0 | 95 } *elim_graph; |
| 96 | |
| 97 | |
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98 /* For an edge E find out a good source location to associate with |
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99 instructions inserted on edge E. If E has an implicit goto set, |
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100 use its location. Otherwise search instructions in predecessors |
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101 of E for a location, and use that one. That makes sense because |
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102 we insert on edges for PHI nodes, and effects of PHIs happen on |
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103 the end of the predecessor conceptually. */ |
| 0 | 104 |
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105 static void |
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106 set_location_for_edge (edge e) |
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107 { |
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108 if (e->goto_locus) |
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109 { |
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110 set_curr_insn_source_location (e->goto_locus); |
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111 set_curr_insn_block (e->goto_block); |
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112 } |
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113 else |
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114 { |
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115 basic_block bb = e->src; |
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116 gimple_stmt_iterator gsi; |
| 0 | 117 |
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118 do |
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119 { |
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120 for (gsi = gsi_last_bb (bb); !gsi_end_p (gsi); gsi_prev (&gsi)) |
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121 { |
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122 gimple stmt = gsi_stmt (gsi); |
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123 if (is_gimple_debug (stmt)) |
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124 continue; |
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125 if (gimple_has_location (stmt) || gimple_block (stmt)) |
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126 { |
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127 set_curr_insn_source_location (gimple_location (stmt)); |
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128 set_curr_insn_block (gimple_block (stmt)); |
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129 return; |
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130 } |
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131 } |
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132 /* Nothing found in this basic block. Make a half-assed attempt |
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133 to continue with another block. */ |
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134 if (single_pred_p (bb)) |
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135 bb = single_pred (bb); |
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136 else |
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137 bb = e->src; |
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138 } |
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139 while (bb != e->src); |
| 0 | 140 } |
| 141 } | |
| 142 | |
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143 /* Emit insns to copy SRC into DEST converting SRC if necessary. */ |
| 0 | 144 |
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145 static inline rtx |
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146 emit_partition_copy (rtx dest, rtx src, int unsignedsrcp) |
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147 { |
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148 rtx seq; |
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149 |
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150 start_sequence (); |
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151 |
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152 if (GET_MODE (src) != VOIDmode && GET_MODE (src) != GET_MODE (dest)) |
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153 src = convert_to_mode (GET_MODE (dest), src, unsignedsrcp); |
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154 emit_move_insn (dest, src); |
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155 |
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156 seq = get_insns (); |
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157 end_sequence (); |
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158 |
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159 return seq; |
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160 } |
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161 |
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162 /* Insert a copy instruction from partition SRC to DEST onto edge E. */ |
| 0 | 163 |
| 164 static void | |
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165 insert_partition_copy_on_edge (edge e, int dest, int src, source_location locus) |
| 0 | 166 { |
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167 rtx seq; |
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168 if (dump_file && (dump_flags & TDF_DETAILS)) |
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169 { |
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170 fprintf (dump_file, |
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171 "Inserting a partition copy on edge BB%d->BB%d :" |
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172 "PART.%d = PART.%d", |
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173 e->src->index, |
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174 e->dest->index, dest, src); |
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175 fprintf (dump_file, "\n"); |
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176 } |
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177 |
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178 gcc_assert (SA.partition_to_pseudo[dest]); |
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179 gcc_assert (SA.partition_to_pseudo[src]); |
| 0 | 180 |
|
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181 set_location_for_edge (e); |
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182 /* If a locus is provided, override the default. */ |
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183 if (locus) |
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184 set_curr_insn_source_location (locus); |
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185 |
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186 seq = emit_partition_copy (SA.partition_to_pseudo[dest], |
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187 SA.partition_to_pseudo[src], |
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188 TYPE_UNSIGNED (TREE_TYPE ( |
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189 partition_to_var (SA.map, src)))); |
| 0 | 190 |
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191 insert_insn_on_edge (seq, e); |
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192 } |
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193 |
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194 /* Insert a copy instruction from expression SRC to partition DEST |
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195 onto edge E. */ |
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196 |
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197 static void |
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198 insert_value_copy_on_edge (edge e, int dest, tree src, source_location locus) |
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199 { |
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200 rtx seq, x; |
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201 enum machine_mode dest_mode, src_mode; |
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202 int unsignedp; |
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203 tree var; |
| 0 | 204 |
| 205 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 206 { | |
| 207 fprintf (dump_file, | |
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208 "Inserting a value copy on edge BB%d->BB%d : PART.%d = ", |
| 0 | 209 e->src->index, |
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210 e->dest->index, dest); |
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211 print_generic_expr (dump_file, src, TDF_SLIM); |
| 0 | 212 fprintf (dump_file, "\n"); |
| 213 } | |
| 214 | |
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215 gcc_assert (SA.partition_to_pseudo[dest]); |
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216 |
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217 set_location_for_edge (e); |
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218 /* If a locus is provided, override the default. */ |
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219 if (locus) |
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220 set_curr_insn_source_location (locus); |
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221 |
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222 start_sequence (); |
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223 |
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224 var = SSA_NAME_VAR (partition_to_var (SA.map, dest)); |
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225 src_mode = TYPE_MODE (TREE_TYPE (src)); |
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226 dest_mode = promote_decl_mode (var, &unsignedp); |
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227 gcc_assert (src_mode == TYPE_MODE (TREE_TYPE (var))); |
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228 gcc_assert (dest_mode == GET_MODE (SA.partition_to_pseudo[dest])); |
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229 |
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230 if (src_mode != dest_mode) |
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231 { |
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232 x = expand_expr (src, NULL, src_mode, EXPAND_NORMAL); |
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233 x = convert_modes (dest_mode, src_mode, x, unsignedp); |
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234 } |
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235 else |
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236 x = expand_expr (src, SA.partition_to_pseudo[dest], |
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237 dest_mode, EXPAND_NORMAL); |
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238 |
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239 if (x != SA.partition_to_pseudo[dest]) |
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240 emit_move_insn (SA.partition_to_pseudo[dest], x); |
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241 seq = get_insns (); |
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242 end_sequence (); |
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243 |
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244 insert_insn_on_edge (seq, e); |
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245 } |
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246 |
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247 /* Insert a copy instruction from RTL expression SRC to partition DEST |
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248 onto edge E. */ |
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249 |
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250 static void |
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251 insert_rtx_to_part_on_edge (edge e, int dest, rtx src, int unsignedsrcp, |
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252 source_location locus) |
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253 { |
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254 rtx seq; |
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255 if (dump_file && (dump_flags & TDF_DETAILS)) |
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256 { |
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257 fprintf (dump_file, |
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258 "Inserting a temp copy on edge BB%d->BB%d : PART.%d = ", |
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259 e->src->index, |
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260 e->dest->index, dest); |
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261 print_simple_rtl (dump_file, src); |
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262 fprintf (dump_file, "\n"); |
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263 } |
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264 |
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265 gcc_assert (SA.partition_to_pseudo[dest]); |
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266 |
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267 set_location_for_edge (e); |
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268 /* If a locus is provided, override the default. */ |
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269 if (locus) |
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270 set_curr_insn_source_location (locus); |
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271 |
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272 seq = emit_partition_copy (SA.partition_to_pseudo[dest], |
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273 src, |
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274 unsignedsrcp); |
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275 |
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276 insert_insn_on_edge (seq, e); |
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277 } |
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278 |
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279 /* Insert a copy instruction from partition SRC to RTL lvalue DEST |
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280 onto edge E. */ |
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281 |
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282 static void |
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283 insert_part_to_rtx_on_edge (edge e, rtx dest, int src, source_location locus) |
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284 { |
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285 rtx seq; |
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286 if (dump_file && (dump_flags & TDF_DETAILS)) |
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287 { |
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288 fprintf (dump_file, |
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289 "Inserting a temp copy on edge BB%d->BB%d : ", |
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290 e->src->index, |
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291 e->dest->index); |
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292 print_simple_rtl (dump_file, dest); |
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293 fprintf (dump_file, "= PART.%d\n", src); |
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294 } |
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295 |
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296 gcc_assert (SA.partition_to_pseudo[src]); |
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297 |
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298 set_location_for_edge (e); |
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299 /* If a locus is provided, override the default. */ |
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300 if (locus) |
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301 set_curr_insn_source_location (locus); |
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302 |
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303 seq = emit_partition_copy (dest, |
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304 SA.partition_to_pseudo[src], |
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305 TYPE_UNSIGNED (TREE_TYPE ( |
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306 partition_to_var (SA.map, src)))); |
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307 |
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308 insert_insn_on_edge (seq, e); |
| 0 | 309 } |
| 310 | |
| 311 | |
| 312 /* Create an elimination graph with SIZE nodes and associated data | |
| 313 structures. */ | |
| 314 | |
| 315 static elim_graph | |
| 316 new_elim_graph (int size) | |
| 317 { | |
| 318 elim_graph g = (elim_graph) xmalloc (sizeof (struct _elim_graph)); | |
| 319 | |
|
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320 g->nodes = VEC_alloc (int, heap, 30); |
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321 g->const_dests = VEC_alloc (int, heap, 20); |
| 0 | 322 g->const_copies = VEC_alloc (tree, heap, 20); |
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323 g->copy_locus = VEC_alloc (source_location, heap, 10); |
| 0 | 324 g->edge_list = VEC_alloc (int, heap, 20); |
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325 g->edge_locus = VEC_alloc (source_location, heap, 10); |
| 0 | 326 g->stack = VEC_alloc (int, heap, 30); |
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327 |
| 0 | 328 g->visited = sbitmap_alloc (size); |
| 329 | |
| 330 return g; | |
| 331 } | |
| 332 | |
| 333 | |
| 334 /* Empty elimination graph G. */ | |
| 335 | |
| 336 static inline void | |
| 337 clear_elim_graph (elim_graph g) | |
| 338 { | |
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339 VEC_truncate (int, g->nodes, 0); |
| 0 | 340 VEC_truncate (int, g->edge_list, 0); |
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341 VEC_truncate (source_location, g->edge_locus, 0); |
| 0 | 342 } |
| 343 | |
| 344 | |
| 345 /* Delete elimination graph G. */ | |
| 346 | |
| 347 static inline void | |
| 348 delete_elim_graph (elim_graph g) | |
| 349 { | |
| 350 sbitmap_free (g->visited); | |
| 351 VEC_free (int, heap, g->stack); | |
| 352 VEC_free (int, heap, g->edge_list); | |
| 353 VEC_free (tree, heap, g->const_copies); | |
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354 VEC_free (int, heap, g->const_dests); |
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355 VEC_free (int, heap, g->nodes); |
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356 VEC_free (source_location, heap, g->copy_locus); |
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357 VEC_free (source_location, heap, g->edge_locus); |
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358 |
| 0 | 359 free (g); |
| 360 } | |
| 361 | |
| 362 | |
| 363 /* Return the number of nodes in graph G. */ | |
| 364 | |
| 365 static inline int | |
| 366 elim_graph_size (elim_graph g) | |
| 367 { | |
|
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368 return VEC_length (int, g->nodes); |
| 0 | 369 } |
| 370 | |
| 371 | |
| 372 /* Add NODE to graph G, if it doesn't exist already. */ | |
| 373 | |
|
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374 static inline void |
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375 elim_graph_add_node (elim_graph g, int node) |
| 0 | 376 { |
| 377 int x; | |
|
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378 int t; |
| 0 | 379 |
|
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380 for (x = 0; VEC_iterate (int, g->nodes, x, t); x++) |
| 0 | 381 if (t == node) |
| 382 return; | |
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383 VEC_safe_push (int, heap, g->nodes, node); |
| 0 | 384 } |
| 385 | |
| 386 | |
| 387 /* Add the edge PRED->SUCC to graph G. */ | |
| 388 | |
| 389 static inline void | |
|
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390 elim_graph_add_edge (elim_graph g, int pred, int succ, source_location locus) |
| 0 | 391 { |
| 392 VEC_safe_push (int, heap, g->edge_list, pred); | |
| 393 VEC_safe_push (int, heap, g->edge_list, succ); | |
|
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394 VEC_safe_push (source_location, heap, g->edge_locus, locus); |
| 0 | 395 } |
| 396 | |
| 397 | |
| 398 /* Remove an edge from graph G for which NODE is the predecessor, and | |
| 399 return the successor node. -1 is returned if there is no such edge. */ | |
| 400 | |
| 401 static inline int | |
|
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402 elim_graph_remove_succ_edge (elim_graph g, int node, source_location *locus) |
| 0 | 403 { |
| 404 int y; | |
| 405 unsigned x; | |
| 406 for (x = 0; x < VEC_length (int, g->edge_list); x += 2) | |
| 407 if (VEC_index (int, g->edge_list, x) == node) | |
| 408 { | |
| 409 VEC_replace (int, g->edge_list, x, -1); | |
| 410 y = VEC_index (int, g->edge_list, x + 1); | |
| 411 VEC_replace (int, g->edge_list, x + 1, -1); | |
|
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412 *locus = VEC_index (source_location, g->edge_locus, x / 2); |
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413 VEC_replace (source_location, g->edge_locus, x / 2, UNKNOWN_LOCATION); |
| 0 | 414 return y; |
| 415 } | |
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416 *locus = UNKNOWN_LOCATION; |
| 0 | 417 return -1; |
| 418 } | |
| 419 | |
| 420 | |
| 421 /* Find all the nodes in GRAPH which are successors to NODE in the | |
| 422 edge list. VAR will hold the partition number found. CODE is the | |
| 423 code fragment executed for every node found. */ | |
| 424 | |
|
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425 #define FOR_EACH_ELIM_GRAPH_SUCC(GRAPH, NODE, VAR, LOCUS, CODE) \ |
| 0 | 426 do { \ |
| 427 unsigned x_; \ | |
| 428 int y_; \ | |
| 429 for (x_ = 0; x_ < VEC_length (int, (GRAPH)->edge_list); x_ += 2) \ | |
| 430 { \ | |
| 431 y_ = VEC_index (int, (GRAPH)->edge_list, x_); \ | |
| 432 if (y_ != (NODE)) \ | |
| 433 continue; \ | |
| 434 (VAR) = VEC_index (int, (GRAPH)->edge_list, x_ + 1); \ | |
|
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435 (LOCUS) = VEC_index (source_location, (GRAPH)->edge_locus, x_ / 2); \ |
| 0 | 436 CODE; \ |
| 437 } \ | |
| 438 } while (0) | |
| 439 | |
| 440 | |
| 441 /* Find all the nodes which are predecessors of NODE in the edge list for | |
| 442 GRAPH. VAR will hold the partition number found. CODE is the | |
| 443 code fragment executed for every node found. */ | |
| 444 | |
|
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445 #define FOR_EACH_ELIM_GRAPH_PRED(GRAPH, NODE, VAR, LOCUS, CODE) \ |
| 0 | 446 do { \ |
| 447 unsigned x_; \ | |
| 448 int y_; \ | |
| 449 for (x_ = 0; x_ < VEC_length (int, (GRAPH)->edge_list); x_ += 2) \ | |
| 450 { \ | |
| 451 y_ = VEC_index (int, (GRAPH)->edge_list, x_ + 1); \ | |
| 452 if (y_ != (NODE)) \ | |
| 453 continue; \ | |
| 454 (VAR) = VEC_index (int, (GRAPH)->edge_list, x_); \ | |
|
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455 (LOCUS) = VEC_index (source_location, (GRAPH)->edge_locus, x_ / 2); \ |
| 0 | 456 CODE; \ |
| 457 } \ | |
| 458 } while (0) | |
| 459 | |
| 460 | |
| 461 /* Add T to elimination graph G. */ | |
| 462 | |
| 463 static inline void | |
|
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464 eliminate_name (elim_graph g, int T) |
| 0 | 465 { |
| 466 elim_graph_add_node (g, T); | |
| 467 } | |
| 468 | |
| 469 | |
| 470 /* Build elimination graph G for basic block BB on incoming PHI edge | |
| 471 G->e. */ | |
| 472 | |
| 473 static void | |
|
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474 eliminate_build (elim_graph g) |
| 0 | 475 { |
|
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476 tree Ti; |
| 0 | 477 int p0, pi; |
| 478 gimple_stmt_iterator gsi; | |
| 479 | |
| 480 clear_elim_graph (g); | |
|
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481 |
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482 for (gsi = gsi_start_phis (g->e->dest); !gsi_end_p (gsi); gsi_next (&gsi)) |
| 0 | 483 { |
| 484 gimple phi = gsi_stmt (gsi); | |
|
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485 source_location locus; |
| 0 | 486 |
|
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487 p0 = var_to_partition (g->map, gimple_phi_result (phi)); |
| 0 | 488 /* Ignore results which are not in partitions. */ |
|
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489 if (p0 == NO_PARTITION) |
| 0 | 490 continue; |
| 491 | |
| 492 Ti = PHI_ARG_DEF (phi, g->e->dest_idx); | |
|
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493 locus = gimple_phi_arg_location_from_edge (phi, g->e); |
| 0 | 494 |
| 495 /* If this argument is a constant, or a SSA_NAME which is being | |
| 496 left in SSA form, just queue a copy to be emitted on this | |
| 497 edge. */ | |
| 498 if (!phi_ssa_name_p (Ti) | |
| 499 || (TREE_CODE (Ti) == SSA_NAME | |
| 500 && var_to_partition (g->map, Ti) == NO_PARTITION)) | |
| 501 { | |
| 502 /* Save constant copies until all other copies have been emitted | |
| 503 on this edge. */ | |
|
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504 VEC_safe_push (int, heap, g->const_dests, p0); |
| 0 | 505 VEC_safe_push (tree, heap, g->const_copies, Ti); |
|
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506 VEC_safe_push (source_location, heap, g->copy_locus, locus); |
| 0 | 507 } |
| 508 else | |
| 509 { | |
|
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510 pi = var_to_partition (g->map, Ti); |
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511 if (p0 != pi) |
| 0 | 512 { |
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513 eliminate_name (g, p0); |
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514 eliminate_name (g, pi); |
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515 elim_graph_add_edge (g, p0, pi, locus); |
| 0 | 516 } |
| 517 } | |
| 518 } | |
| 519 } | |
| 520 | |
| 521 | |
| 522 /* Push successors of T onto the elimination stack for G. */ | |
| 523 | |
|
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524 static void |
| 0 | 525 elim_forward (elim_graph g, int T) |
| 526 { | |
| 527 int S; | |
|
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528 source_location locus; |
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529 |
| 0 | 530 SET_BIT (g->visited, T); |
|
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531 FOR_EACH_ELIM_GRAPH_SUCC (g, T, S, locus, |
| 0 | 532 { |
| 533 if (!TEST_BIT (g->visited, S)) | |
| 534 elim_forward (g, S); | |
| 535 }); | |
| 536 VEC_safe_push (int, heap, g->stack, T); | |
| 537 } | |
| 538 | |
| 539 | |
| 540 /* Return 1 if there unvisited predecessors of T in graph G. */ | |
| 541 | |
| 542 static int | |
| 543 elim_unvisited_predecessor (elim_graph g, int T) | |
| 544 { | |
| 545 int P; | |
|
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546 source_location locus; |
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547 |
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548 FOR_EACH_ELIM_GRAPH_PRED (g, T, P, locus, |
| 0 | 549 { |
| 550 if (!TEST_BIT (g->visited, P)) | |
| 551 return 1; | |
| 552 }); | |
| 553 return 0; | |
| 554 } | |
| 555 | |
| 556 /* Process predecessors first, and insert a copy. */ | |
| 557 | |
| 558 static void | |
| 559 elim_backward (elim_graph g, int T) | |
| 560 { | |
| 561 int P; | |
|
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562 source_location locus; |
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563 |
| 0 | 564 SET_BIT (g->visited, T); |
|
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565 FOR_EACH_ELIM_GRAPH_PRED (g, T, P, locus, |
| 0 | 566 { |
| 567 if (!TEST_BIT (g->visited, P)) | |
| 568 { | |
| 569 elim_backward (g, P); | |
|
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570 insert_partition_copy_on_edge (g->e, P, T, locus); |
| 0 | 571 } |
| 572 }); | |
| 573 } | |
| 574 | |
|
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575 /* Allocate a new pseudo register usable for storing values sitting |
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576 in NAME (a decl or SSA name), i.e. with matching mode and attributes. */ |
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577 |
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578 static rtx |
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579 get_temp_reg (tree name) |
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580 { |
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581 tree var = TREE_CODE (name) == SSA_NAME ? SSA_NAME_VAR (name) : name; |
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582 tree type = TREE_TYPE (var); |
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583 int unsignedp; |
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584 enum machine_mode reg_mode = promote_decl_mode (var, &unsignedp); |
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585 rtx x = gen_reg_rtx (reg_mode); |
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586 if (POINTER_TYPE_P (type)) |
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587 mark_reg_pointer (x, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (var)))); |
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588 return x; |
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589 } |
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590 |
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591 /* Insert required copies for T in graph G. Check for a strongly connected |
| 0 | 592 region, and create a temporary to break the cycle if one is found. */ |
| 593 | |
|
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594 static void |
| 0 | 595 elim_create (elim_graph g, int T) |
| 596 { | |
| 597 int P, S; | |
|
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598 source_location locus; |
| 0 | 599 |
| 600 if (elim_unvisited_predecessor (g, T)) | |
| 601 { | |
|
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602 tree var = partition_to_var (g->map, T); |
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603 rtx U = get_temp_reg (var); |
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604 int unsignedsrcp = TYPE_UNSIGNED (TREE_TYPE (var)); |
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605 |
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606 insert_part_to_rtx_on_edge (g->e, U, T, UNKNOWN_LOCATION); |
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607 FOR_EACH_ELIM_GRAPH_PRED (g, T, P, locus, |
| 0 | 608 { |
| 609 if (!TEST_BIT (g->visited, P)) | |
| 610 { | |
| 611 elim_backward (g, P); | |
|
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612 insert_rtx_to_part_on_edge (g->e, P, U, unsignedsrcp, locus); |
| 0 | 613 } |
| 614 }); | |
| 615 } | |
| 616 else | |
| 617 { | |
|
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618 S = elim_graph_remove_succ_edge (g, T, &locus); |
| 0 | 619 if (S != -1) |
| 620 { | |
| 621 SET_BIT (g->visited, T); | |
|
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622 insert_partition_copy_on_edge (g->e, T, S, locus); |
| 0 | 623 } |
| 624 } | |
| 625 } | |
| 626 | |
| 627 | |
| 628 /* Eliminate all the phi nodes on edge E in graph G. */ | |
| 629 | |
| 630 static void | |
| 631 eliminate_phi (edge e, elim_graph g) | |
| 632 { | |
| 633 int x; | |
| 634 | |
| 635 gcc_assert (VEC_length (tree, g->const_copies) == 0); | |
|
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636 gcc_assert (VEC_length (source_location, g->copy_locus) == 0); |
| 0 | 637 |
| 638 /* Abnormal edges already have everything coalesced. */ | |
| 639 if (e->flags & EDGE_ABNORMAL) | |
| 640 return; | |
| 641 | |
| 642 g->e = e; | |
| 643 | |
|
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644 eliminate_build (g); |
| 0 | 645 |
| 646 if (elim_graph_size (g) != 0) | |
| 647 { | |
|
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648 int part; |
| 0 | 649 |
| 650 sbitmap_zero (g->visited); | |
| 651 VEC_truncate (int, g->stack, 0); | |
| 652 | |
|
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653 for (x = 0; VEC_iterate (int, g->nodes, x, part); x++) |
| 0 | 654 { |
|
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655 if (!TEST_BIT (g->visited, part)) |
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656 elim_forward (g, part); |
| 0 | 657 } |
|
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658 |
| 0 | 659 sbitmap_zero (g->visited); |
| 660 while (VEC_length (int, g->stack) > 0) | |
| 661 { | |
| 662 x = VEC_pop (int, g->stack); | |
| 663 if (!TEST_BIT (g->visited, x)) | |
| 664 elim_create (g, x); | |
| 665 } | |
| 666 } | |
| 667 | |
| 668 /* If there are any pending constant copies, issue them now. */ | |
| 669 while (VEC_length (tree, g->const_copies) > 0) | |
| 670 { | |
|
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671 int dest; |
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672 tree src; |
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673 source_location locus; |
| 0 | 674 |
|
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675 src = VEC_pop (tree, g->const_copies); |
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676 dest = VEC_pop (int, g->const_dests); |
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677 locus = VEC_pop (source_location, g->copy_locus); |
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678 insert_value_copy_on_edge (e, dest, src, locus); |
| 0 | 679 } |
| 680 } | |
| 681 | |
| 682 | |
|
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683 /* Remove each argument from PHI. If an arg was the last use of an SSA_NAME, |
| 0 | 684 check to see if this allows another PHI node to be removed. */ |
| 685 | |
| 686 static void | |
| 687 remove_gimple_phi_args (gimple phi) | |
| 688 { | |
| 689 use_operand_p arg_p; | |
| 690 ssa_op_iter iter; | |
| 691 | |
| 692 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 693 { | |
| 694 fprintf (dump_file, "Removing Dead PHI definition: "); | |
| 695 print_gimple_stmt (dump_file, phi, 0, TDF_SLIM); | |
| 696 } | |
| 697 | |
| 698 FOR_EACH_PHI_ARG (arg_p, phi, iter, SSA_OP_USE) | |
| 699 { | |
| 700 tree arg = USE_FROM_PTR (arg_p); | |
| 701 if (TREE_CODE (arg) == SSA_NAME) | |
| 702 { | |
| 703 /* Remove the reference to the existing argument. */ | |
| 704 SET_USE (arg_p, NULL_TREE); | |
| 705 if (has_zero_uses (arg)) | |
| 706 { | |
| 707 gimple stmt; | |
| 708 gimple_stmt_iterator gsi; | |
| 709 | |
| 710 stmt = SSA_NAME_DEF_STMT (arg); | |
| 711 | |
| 712 /* Also remove the def if it is a PHI node. */ | |
| 713 if (gimple_code (stmt) == GIMPLE_PHI) | |
| 714 { | |
| 715 remove_gimple_phi_args (stmt); | |
| 716 gsi = gsi_for_stmt (stmt); | |
| 717 remove_phi_node (&gsi, true); | |
| 718 } | |
| 719 | |
| 720 } | |
| 721 } | |
| 722 } | |
| 723 } | |
| 724 | |
| 725 /* Remove any PHI node which is a virtual PHI, or a PHI with no uses. */ | |
| 726 | |
| 727 static void | |
| 728 eliminate_useless_phis (void) | |
| 729 { | |
| 730 basic_block bb; | |
| 731 gimple_stmt_iterator gsi; | |
| 732 tree result; | |
| 733 | |
| 734 FOR_EACH_BB (bb) | |
| 735 { | |
| 736 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); ) | |
| 737 { | |
| 738 gimple phi = gsi_stmt (gsi); | |
| 739 result = gimple_phi_result (phi); | |
| 740 if (!is_gimple_reg (SSA_NAME_VAR (result))) | |
| 741 { | |
| 742 #ifdef ENABLE_CHECKING | |
| 743 size_t i; | |
| 744 /* There should be no arguments which are not virtual, or the | |
| 745 results will be incorrect. */ | |
| 746 for (i = 0; i < gimple_phi_num_args (phi); i++) | |
| 747 { | |
| 748 tree arg = PHI_ARG_DEF (phi, i); | |
|
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749 if (TREE_CODE (arg) == SSA_NAME |
| 0 | 750 && is_gimple_reg (SSA_NAME_VAR (arg))) |
| 751 { | |
| 752 fprintf (stderr, "Argument of PHI is not virtual ("); | |
| 753 print_generic_expr (stderr, arg, TDF_SLIM); | |
| 754 fprintf (stderr, "), but the result is :"); | |
| 755 print_gimple_stmt (stderr, phi, 0, TDF_SLIM); | |
| 756 internal_error ("SSA corruption"); | |
| 757 } | |
| 758 } | |
| 759 #endif | |
| 760 remove_phi_node (&gsi, true); | |
| 761 } | |
| 762 else | |
| 763 { | |
| 764 /* Also remove real PHIs with no uses. */ | |
| 765 if (has_zero_uses (result)) | |
| 766 { | |
| 767 remove_gimple_phi_args (phi); | |
| 768 remove_phi_node (&gsi, true); | |
| 769 } | |
| 770 else | |
| 771 gsi_next (&gsi); | |
| 772 } | |
| 773 } | |
| 774 } | |
| 775 } | |
| 776 | |
| 777 | |
| 778 /* This function will rewrite the current program using the variable mapping | |
|
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779 found in MAP. If the replacement vector VALUES is provided, any |
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780 occurrences of partitions with non-null entries in the vector will be |
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781 replaced with the expression in the vector instead of its mapped |
| 0 | 782 variable. */ |
| 783 | |
| 784 static void | |
|
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785 rewrite_trees (var_map map ATTRIBUTE_UNUSED) |
| 0 | 786 { |
|
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787 #ifdef ENABLE_CHECKING |
| 0 | 788 basic_block bb; |
| 789 /* Search for PHIs where the destination has no partition, but one | |
| 790 or more arguments has a partition. This should not happen and can | |
| 791 create incorrect code. */ | |
| 792 FOR_EACH_BB (bb) | |
| 793 { | |
|
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794 gimple_stmt_iterator gsi; |
| 0 | 795 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| 796 { | |
| 797 gimple phi = gsi_stmt (gsi); | |
| 798 tree T0 = var_to_partition_to_var (map, gimple_phi_result (phi)); | |
| 799 if (T0 == NULL_TREE) | |
| 800 { | |
| 801 size_t i; | |
| 802 for (i = 0; i < gimple_phi_num_args (phi); i++) | |
| 803 { | |
| 804 tree arg = PHI_ARG_DEF (phi, i); | |
| 805 | |
| 806 if (TREE_CODE (arg) == SSA_NAME | |
| 807 && var_to_partition (map, arg) != NO_PARTITION) | |
| 808 { | |
| 809 fprintf (stderr, "Argument of PHI is in a partition :("); | |
| 810 print_generic_expr (stderr, arg, TDF_SLIM); | |
| 811 fprintf (stderr, "), but the result is not :"); | |
| 812 print_gimple_stmt (stderr, phi, 0, TDF_SLIM); | |
| 813 internal_error ("SSA corruption"); | |
| 814 } | |
| 815 } | |
| 816 } | |
| 817 } | |
| 818 } | |
| 819 #endif | |
| 820 } | |
| 821 | |
|
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|
822 /* Given the out-of-ssa info object SA (with prepared partitions) |
|
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823 eliminate all phi nodes in all basic blocks. Afterwards no |
|
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824 basic block will have phi nodes anymore and there are possibly |
|
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825 some RTL instructions inserted on edges. */ |
| 0 | 826 |
|
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|
827 void |
|
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|
828 expand_phi_nodes (struct ssaexpand *sa) |
|
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829 { |
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830 basic_block bb; |
|
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831 elim_graph g = new_elim_graph (sa->map->num_partitions); |
|
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832 g->map = sa->map; |
| 0 | 833 |
|
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|
834 FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR->next_bb, EXIT_BLOCK_PTR, next_bb) |
|
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835 if (!gimple_seq_empty_p (phi_nodes (bb))) |
| 0 | 836 { |
|
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|
837 edge e; |
|
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|
838 edge_iterator ei; |
|
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|
839 FOR_EACH_EDGE (e, ei, bb->preds) |
|
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840 eliminate_phi (e, g); |
|
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841 set_phi_nodes (bb, NULL); |
|
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842 /* We can't redirect EH edges in RTL land, so we need to do this |
|
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843 here. Redirection happens only when splitting is necessary, |
|
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844 which it is only for critical edges, normally. For EH edges |
|
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845 it might also be necessary when the successor has more than |
|
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846 one predecessor. In that case the edge is either required to |
|
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847 be fallthru (which EH edges aren't), or the predecessor needs |
|
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848 to end with a jump (which again, isn't the case with EH edges). |
|
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849 Hence, split all EH edges on which we inserted instructions |
|
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850 and whose successor has multiple predecessors. */ |
|
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851 for (ei = ei_start (bb->preds); (e = ei_safe_edge (ei)); ) |
|
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852 { |
|
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853 if (e->insns.r && (e->flags & EDGE_EH) |
|
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854 && !single_pred_p (e->dest)) |
|
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855 { |
|
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|
856 rtx insns = e->insns.r; |
|
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857 basic_block bb; |
|
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|
858 e->insns.r = NULL_RTX; |
|
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|
859 bb = split_edge (e); |
|
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|
860 single_pred_edge (bb)->insns.r = insns; |
|
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|
861 } |
|
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|
862 else |
|
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|
863 ei_next (&ei); |
|
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|
864 } |
| 0 | 865 } |
| 866 | |
|
55
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|
867 delete_elim_graph (g); |
| 0 | 868 } |
| 869 | |
| 870 | |
| 871 /* Remove the ssa-names in the current function and translate them into normal | |
| 872 compiler variables. PERFORM_TER is true if Temporary Expression Replacement | |
| 873 should also be used. */ | |
| 874 | |
| 875 static void | |
|
55
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|
876 remove_ssa_form (bool perform_ter, struct ssaexpand *sa) |
| 0 | 877 { |
|
55
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|
878 bitmap values = NULL; |
| 0 | 879 var_map map; |
|
55
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|
880 unsigned i; |
| 0 | 881 |
| 882 map = coalesce_ssa_name (); | |
| 883 | |
| 884 /* Return to viewing the variable list as just all reference variables after | |
| 885 coalescing has been performed. */ | |
| 886 partition_view_normal (map, false); | |
| 887 | |
| 888 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 889 { | |
| 890 fprintf (dump_file, "After Coalescing:\n"); | |
| 891 dump_var_map (dump_file, map); | |
| 892 } | |
| 893 | |
| 894 if (perform_ter) | |
| 895 { | |
| 896 values = find_replaceable_exprs (map); | |
| 897 if (values && dump_file && (dump_flags & TDF_DETAILS)) | |
| 898 dump_replaceable_exprs (dump_file, values); | |
| 899 } | |
| 900 | |
|
55
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|
901 rewrite_trees (map); |
|
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|
902 |
|
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|
903 sa->map = map; |
|
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|
904 sa->values = values; |
|
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|
905 sa->partition_has_default_def = BITMAP_ALLOC (NULL); |
|
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diff
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|
906 for (i = 1; i < num_ssa_names; i++) |
|
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|
907 { |
|
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|
908 tree t = ssa_name (i); |
|
77e2b8dfacca
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diff
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|
909 if (t && SSA_NAME_IS_DEFAULT_DEF (t)) |
|
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|
910 { |
|
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changeset
|
911 int p = var_to_partition (map, t); |
|
77e2b8dfacca
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diff
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|
912 if (p != NO_PARTITION) |
|
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diff
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|
913 bitmap_set_bit (sa->partition_has_default_def, p); |
|
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|
914 } |
|
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|
915 } |
|
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|
916 } |
|
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|
917 |
|
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diff
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|
918 |
|
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diff
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|
919 /* If not already done so for basic block BB, assign increasing uids |
|
77e2b8dfacca
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diff
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|
920 to each of its instructions. */ |
|
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|
921 |
|
77e2b8dfacca
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0
diff
changeset
|
922 static void |
|
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diff
changeset
|
923 maybe_renumber_stmts_bb (basic_block bb) |
|
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|
924 { |
|
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|
925 unsigned i = 0; |
|
77e2b8dfacca
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|
926 gimple_stmt_iterator gsi; |
| 0 | 927 |
|
55
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|
928 if (!bb->aux) |
|
77e2b8dfacca
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|
929 return; |
|
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|
930 bb->aux = NULL; |
|
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|
931 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| 0 | 932 { |
|
55
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|
933 gimple stmt = gsi_stmt (gsi); |
|
77e2b8dfacca
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|
934 gimple_set_uid (stmt, i); |
|
77e2b8dfacca
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|
935 i++; |
|
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|
936 } |
|
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|
937 } |
|
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|
938 |
|
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|
939 |
|
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|
940 /* Return true if we can determine that the SSA_NAMEs RESULT (a result |
|
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|
941 of a PHI node) and ARG (one of its arguments) conflict. Return false |
|
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|
942 otherwise, also when we simply aren't sure. */ |
|
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|
943 |
|
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|
944 static bool |
|
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changeset
|
945 trivially_conflicts_p (basic_block bb, tree result, tree arg) |
|
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|
946 { |
|
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|
947 use_operand_p use; |
|
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|
948 imm_use_iterator imm_iter; |
|
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|
949 gimple defa = SSA_NAME_DEF_STMT (arg); |
|
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|
950 |
|
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|
951 /* If ARG isn't defined in the same block it's too complicated for |
|
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parents:
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952 our little mind. */ |
|
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953 if (gimple_bb (defa) != bb) |
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954 return false; |
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955 |
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956 FOR_EACH_IMM_USE_FAST (use, imm_iter, result) |
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957 { |
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958 gimple use_stmt = USE_STMT (use); |
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959 /* Now, if there's a use of RESULT that lies outside this basic block, |
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960 then there surely is a conflict with ARG. */ |
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961 if (gimple_bb (use_stmt) != bb) |
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962 return true; |
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963 if (gimple_code (use_stmt) == GIMPLE_PHI) |
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964 continue; |
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965 /* The use now is in a real stmt of BB, so if ARG was defined |
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966 in a PHI node (like RESULT) both conflict. */ |
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967 if (gimple_code (defa) == GIMPLE_PHI) |
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968 return true; |
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969 maybe_renumber_stmts_bb (bb); |
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970 /* If the use of RESULT occurs after the definition of ARG, |
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971 the two conflict too. */ |
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972 if (gimple_uid (defa) < gimple_uid (use_stmt)) |
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973 return true; |
| 0 | 974 } |
| 975 | |
|
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976 return false; |
| 0 | 977 } |
| 978 | |
| 979 | |
| 980 /* Search every PHI node for arguments associated with backedges which | |
| 981 we can trivially determine will need a copy (the argument is either | |
| 982 not an SSA_NAME or the argument has a different underlying variable | |
| 983 than the PHI result). | |
| 984 | |
| 985 Insert a copy from the PHI argument to a new destination at the | |
| 986 end of the block with the backedge to the top of the loop. Update | |
| 987 the PHI argument to reference this new destination. */ | |
| 988 | |
| 989 static void | |
| 990 insert_backedge_copies (void) | |
| 991 { | |
| 992 basic_block bb; | |
| 993 gimple_stmt_iterator gsi; | |
| 994 | |
| 995 FOR_EACH_BB (bb) | |
| 996 { | |
|
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997 /* Mark block as possibly needing calculation of UIDs. */ |
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998 bb->aux = &bb->aux; |
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999 |
| 0 | 1000 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| 1001 { | |
| 1002 gimple phi = gsi_stmt (gsi); | |
| 1003 tree result = gimple_phi_result (phi); | |
| 1004 tree result_var; | |
| 1005 size_t i; | |
| 1006 | |
| 1007 if (!is_gimple_reg (result)) | |
| 1008 continue; | |
| 1009 | |
| 1010 result_var = SSA_NAME_VAR (result); | |
| 1011 for (i = 0; i < gimple_phi_num_args (phi); i++) | |
| 1012 { | |
| 1013 tree arg = gimple_phi_arg_def (phi, i); | |
| 1014 edge e = gimple_phi_arg_edge (phi, i); | |
| 1015 | |
|
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1016 /* If the argument is not an SSA_NAME, then we will need a |
| 0 | 1017 constant initialization. If the argument is an SSA_NAME with |
|
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1018 a different underlying variable then a copy statement will be |
| 0 | 1019 needed. */ |
| 1020 if ((e->flags & EDGE_DFS_BACK) | |
| 1021 && (TREE_CODE (arg) != SSA_NAME | |
|
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1022 || SSA_NAME_VAR (arg) != result_var |
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1023 || trivially_conflicts_p (bb, result, arg))) |
| 0 | 1024 { |
| 1025 tree name; | |
| 1026 gimple stmt, last = NULL; | |
| 1027 gimple_stmt_iterator gsi2; | |
| 1028 | |
| 1029 gsi2 = gsi_last_bb (gimple_phi_arg_edge (phi, i)->src); | |
| 1030 if (!gsi_end_p (gsi2)) | |
| 1031 last = gsi_stmt (gsi2); | |
| 1032 | |
| 1033 /* In theory the only way we ought to get back to the | |
| 1034 start of a loop should be with a COND_EXPR or GOTO_EXPR. | |
|
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1035 However, better safe than sorry. |
| 0 | 1036 If the block ends with a control statement or |
| 1037 something that might throw, then we have to | |
| 1038 insert this assignment before the last | |
| 1039 statement. Else insert it after the last statement. */ | |
| 1040 if (last && stmt_ends_bb_p (last)) | |
| 1041 { | |
| 1042 /* If the last statement in the block is the definition | |
| 1043 site of the PHI argument, then we can't insert | |
| 1044 anything after it. */ | |
| 1045 if (TREE_CODE (arg) == SSA_NAME | |
| 1046 && SSA_NAME_DEF_STMT (arg) == last) | |
| 1047 continue; | |
| 1048 } | |
| 1049 | |
|
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1050 /* Create a new instance of the underlying variable of the |
| 0 | 1051 PHI result. */ |
| 1052 stmt = gimple_build_assign (result_var, | |
| 1053 gimple_phi_arg_def (phi, i)); | |
| 1054 name = make_ssa_name (result_var, stmt); | |
| 1055 gimple_assign_set_lhs (stmt, name); | |
| 1056 | |
|
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1057 /* copy location if present. */ |
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1058 if (gimple_phi_arg_has_location (phi, i)) |
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1059 gimple_set_location (stmt, |
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1060 gimple_phi_arg_location (phi, i)); |
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1061 |
| 0 | 1062 /* Insert the new statement into the block and update |
| 1063 the PHI node. */ | |
| 1064 if (last && stmt_ends_bb_p (last)) | |
| 1065 gsi_insert_before (&gsi2, stmt, GSI_NEW_STMT); | |
| 1066 else | |
| 1067 gsi_insert_after (&gsi2, stmt, GSI_NEW_STMT); | |
| 1068 SET_PHI_ARG_DEF (phi, i, name); | |
| 1069 } | |
| 1070 } | |
| 1071 } | |
|
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1072 |
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1073 /* Unmark this block again. */ |
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1074 bb->aux = NULL; |
| 0 | 1075 } |
| 1076 } | |
| 1077 | |
|
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1078 /* Free all memory associated with going out of SSA form. SA is |
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1079 the outof-SSA info object. */ |
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1080 |
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1081 void |
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1082 finish_out_of_ssa (struct ssaexpand *sa) |
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1083 { |
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1084 free (sa->partition_to_pseudo); |
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1085 if (sa->values) |
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1086 BITMAP_FREE (sa->values); |
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1087 delete_var_map (sa->map); |
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1088 BITMAP_FREE (sa->partition_has_default_def); |
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1089 memset (sa, 0, sizeof *sa); |
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1090 } |
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1091 |
| 0 | 1092 /* Take the current function out of SSA form, translating PHIs as described in |
| 1093 R. Morgan, ``Building an Optimizing Compiler'', | |
| 1094 Butterworth-Heinemann, Boston, MA, 1998. pp 176-186. */ | |
| 1095 | |
|
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1096 unsigned int |
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1097 rewrite_out_of_ssa (struct ssaexpand *sa) |
| 0 | 1098 { |
| 1099 /* If elimination of a PHI requires inserting a copy on a backedge, | |
| 1100 then we will have to split the backedge which has numerous | |
| 1101 undesirable performance effects. | |
| 1102 | |
| 1103 A significant number of such cases can be handled here by inserting | |
| 1104 copies into the loop itself. */ | |
| 1105 insert_backedge_copies (); | |
| 1106 | |
| 1107 | |
| 1108 /* Eliminate PHIs which are of no use, such as virtual or dead phis. */ | |
| 1109 eliminate_useless_phis (); | |
| 1110 | |
| 1111 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1112 gimple_dump_cfg (dump_file, dump_flags & ~TDF_DETAILS); | |
| 1113 | |
|
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1114 remove_ssa_form (flag_tree_ter, sa); |
| 0 | 1115 |
| 1116 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1117 gimple_dump_cfg (dump_file, dump_flags & ~TDF_DETAILS); | |
| 1118 | |
| 1119 return 0; | |
| 1120 } |