Mercurial > hg > CbC > CbC_gcc
annotate gcc/ira-conflicts.c @ 67:f6334be47118
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author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
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date | Tue, 22 Mar 2011 17:18:12 +0900 |
parents | b7f97abdc517 |
children | 04ced10e8804 |
rev | line source |
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0 | 1 /* IRA conflict builder. |
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2 Copyright (C) 2006, 2007, 2008, 2009, 2010 |
0 | 3 Free Software Foundation, Inc. |
4 Contributed by Vladimir Makarov <vmakarov@redhat.com>. | |
5 | |
6 This file is part of GCC. | |
7 | |
8 GCC is free software; you can redistribute it and/or modify it under | |
9 the terms of the GNU General Public License as published by the Free | |
10 Software Foundation; either version 3, or (at your option) any later | |
11 version. | |
12 | |
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
19 along with GCC; see the file COPYING3. If not see | |
20 <http://www.gnu.org/licenses/>. */ | |
21 | |
22 #include "config.h" | |
23 #include "system.h" | |
24 #include "coretypes.h" | |
25 #include "tm.h" | |
26 #include "regs.h" | |
27 #include "rtl.h" | |
28 #include "tm_p.h" | |
29 #include "target.h" | |
30 #include "flags.h" | |
31 #include "hard-reg-set.h" | |
32 #include "basic-block.h" | |
33 #include "insn-config.h" | |
34 #include "recog.h" | |
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35 #include "diagnostic-core.h" |
0 | 36 #include "params.h" |
37 #include "df.h" | |
38 #include "sparseset.h" | |
39 #include "ira-int.h" | |
40 #include "addresses.h" | |
41 | |
42 /* This file contains code responsible for allocno conflict creation, | |
43 allocno copy creation and allocno info accumulation on upper level | |
44 regions. */ | |
45 | |
46 /* ira_allocnos_num array of arrays of bits, recording whether two | |
47 allocno's conflict (can't go in the same hardware register). | |
48 | |
49 Some arrays will be used as conflict bit vector of the | |
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50 corresponding allocnos see function build_object_conflicts. */ |
0 | 51 static IRA_INT_TYPE **conflicts; |
52 | |
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53 /* Macro to test a conflict of C1 and C2 in `conflicts'. */ |
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54 #define OBJECTS_CONFLICT_P(C1, C2) \ |
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55 (OBJECT_MIN (C1) <= OBJECT_CONFLICT_ID (C2) \ |
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56 && OBJECT_CONFLICT_ID (C2) <= OBJECT_MAX (C1) \ |
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57 && TEST_MINMAX_SET_BIT (conflicts[OBJECT_CONFLICT_ID (C1)], \ |
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58 OBJECT_CONFLICT_ID (C2), \ |
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59 OBJECT_MIN (C1), OBJECT_MAX (C1))) |
0 | 60 |
61 | |
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62 /* Record a conflict between objects OBJ1 and OBJ2. If necessary, |
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63 canonicalize the conflict by recording it for lower-order subobjects |
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64 of the corresponding allocnos. */ |
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65 static void |
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66 record_object_conflict (ira_object_t obj1, ira_object_t obj2) |
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67 { |
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68 ira_allocno_t a1 = OBJECT_ALLOCNO (obj1); |
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69 ira_allocno_t a2 = OBJECT_ALLOCNO (obj2); |
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70 int w1 = OBJECT_SUBWORD (obj1); |
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71 int w2 = OBJECT_SUBWORD (obj2); |
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72 int id1, id2; |
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73 |
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74 /* Canonicalize the conflict. If two identically-numbered words |
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75 conflict, always record this as a conflict between words 0. That |
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76 is the only information we need, and it is easier to test for if |
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77 it is collected in each allocno's lowest-order object. */ |
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78 if (w1 == w2 && w1 > 0) |
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79 { |
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80 obj1 = ALLOCNO_OBJECT (a1, 0); |
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81 obj2 = ALLOCNO_OBJECT (a2, 0); |
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82 } |
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83 id1 = OBJECT_CONFLICT_ID (obj1); |
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84 id2 = OBJECT_CONFLICT_ID (obj2); |
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85 |
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86 SET_MINMAX_SET_BIT (conflicts[id1], id2, OBJECT_MIN (obj1), |
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87 OBJECT_MAX (obj1)); |
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88 SET_MINMAX_SET_BIT (conflicts[id2], id1, OBJECT_MIN (obj2), |
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89 OBJECT_MAX (obj2)); |
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90 } |
0 | 91 |
92 /* Build allocno conflict table by processing allocno live ranges. | |
93 Return true if the table was built. The table is not built if it | |
94 is too big. */ | |
95 static bool | |
96 build_conflict_bit_table (void) | |
97 { | |
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98 int i; |
0 | 99 unsigned int j; |
100 enum reg_class cover_class; | |
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101 int object_set_words, allocated_words_num, conflict_bit_vec_words_num; |
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102 live_range_t r; |
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103 ira_allocno_t allocno; |
0 | 104 ira_allocno_iterator ai; |
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105 sparseset objects_live; |
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106 ira_object_t obj; |
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107 ira_allocno_object_iterator aoi; |
0 | 108 |
109 allocated_words_num = 0; | |
110 FOR_EACH_ALLOCNO (allocno, ai) | |
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111 FOR_EACH_ALLOCNO_OBJECT (allocno, obj, aoi) |
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112 { |
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113 if (OBJECT_MAX (obj) < OBJECT_MIN (obj)) |
0 | 114 continue; |
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115 conflict_bit_vec_words_num |
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116 = ((OBJECT_MAX (obj) - OBJECT_MIN (obj) + IRA_INT_BITS) |
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117 / IRA_INT_BITS); |
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118 allocated_words_num += conflict_bit_vec_words_num; |
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119 if ((unsigned long long) allocated_words_num * sizeof (IRA_INT_TYPE) |
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120 > (unsigned long long) IRA_MAX_CONFLICT_TABLE_SIZE * 1024 * 1024) |
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121 { |
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122 if (internal_flag_ira_verbose > 0 && ira_dump_file != NULL) |
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123 fprintf |
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124 (ira_dump_file, |
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125 "+++Conflict table will be too big(>%dMB) -- don't use it\n", |
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126 IRA_MAX_CONFLICT_TABLE_SIZE); |
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127 return false; |
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128 } |
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129 } |
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130 |
0 | 131 conflicts = (IRA_INT_TYPE **) ira_allocate (sizeof (IRA_INT_TYPE *) |
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132 * ira_objects_num); |
0 | 133 allocated_words_num = 0; |
134 FOR_EACH_ALLOCNO (allocno, ai) | |
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135 FOR_EACH_ALLOCNO_OBJECT (allocno, obj, aoi) |
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136 { |
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137 int id = OBJECT_CONFLICT_ID (obj); |
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138 if (OBJECT_MAX (obj) < OBJECT_MIN (obj)) |
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139 { |
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140 conflicts[id] = NULL; |
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141 continue; |
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142 } |
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143 conflict_bit_vec_words_num |
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144 = ((OBJECT_MAX (obj) - OBJECT_MIN (obj) + IRA_INT_BITS) |
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145 / IRA_INT_BITS); |
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146 allocated_words_num += conflict_bit_vec_words_num; |
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147 conflicts[id] |
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148 = (IRA_INT_TYPE *) ira_allocate (sizeof (IRA_INT_TYPE) |
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149 * conflict_bit_vec_words_num); |
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150 memset (conflicts[id], 0, |
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151 sizeof (IRA_INT_TYPE) * conflict_bit_vec_words_num); |
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152 } |
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153 |
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154 object_set_words = (ira_objects_num + IRA_INT_BITS - 1) / IRA_INT_BITS; |
0 | 155 if (internal_flag_ira_verbose > 0 && ira_dump_file != NULL) |
156 fprintf | |
157 (ira_dump_file, | |
158 "+++Allocating %ld bytes for conflict table (uncompressed size %ld)\n", | |
159 (long) allocated_words_num * sizeof (IRA_INT_TYPE), | |
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160 (long) object_set_words * ira_objects_num * sizeof (IRA_INT_TYPE)); |
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161 |
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162 objects_live = sparseset_alloc (ira_objects_num); |
0 | 163 for (i = 0; i < ira_max_point; i++) |
164 { | |
165 for (r = ira_start_point_ranges[i]; r != NULL; r = r->start_next) | |
166 { | |
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167 ira_object_t obj = r->object; |
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168 ira_allocno_t allocno = OBJECT_ALLOCNO (obj); |
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169 int id = OBJECT_CONFLICT_ID (obj); |
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170 |
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171 gcc_assert (id < ira_objects_num); |
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172 |
0 | 173 cover_class = ALLOCNO_COVER_CLASS (allocno); |
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174 sparseset_set_bit (objects_live, id); |
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175 EXECUTE_IF_SET_IN_SPARSESET (objects_live, j) |
0 | 176 { |
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177 ira_object_t live_obj = ira_object_id_map[j]; |
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178 ira_allocno_t live_a = OBJECT_ALLOCNO (live_obj); |
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179 enum reg_class live_cover_class = ALLOCNO_COVER_CLASS (live_a); |
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180 |
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181 if (ira_reg_classes_intersect_p[cover_class][live_cover_class] |
0 | 182 /* Don't set up conflict for the allocno with itself. */ |
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183 && live_a != allocno) |
0 | 184 { |
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185 record_object_conflict (obj, live_obj); |
0 | 186 } |
187 } | |
188 } | |
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189 |
0 | 190 for (r = ira_finish_point_ranges[i]; r != NULL; r = r->finish_next) |
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191 sparseset_clear_bit (objects_live, OBJECT_CONFLICT_ID (r->object)); |
0 | 192 } |
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193 sparseset_free (objects_live); |
0 | 194 return true; |
195 } | |
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196 |
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197 /* Return true iff allocnos A1 and A2 cannot be allocated to the same |
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198 register due to conflicts. */ |
0 | 199 |
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200 static bool |
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201 allocnos_conflict_for_copy_p (ira_allocno_t a1, ira_allocno_t a2) |
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202 { |
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203 /* Due to the fact that we canonicalize conflicts (see |
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204 record_object_conflict), we only need to test for conflicts of |
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205 the lowest order words. */ |
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206 ira_object_t obj1 = ALLOCNO_OBJECT (a1, 0); |
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207 ira_object_t obj2 = ALLOCNO_OBJECT (a2, 0); |
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208 return OBJECTS_CONFLICT_P (obj1, obj2); |
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209 } |
0 | 210 |
211 /* Return TRUE if the operand constraint STR is commutative. */ | |
212 static bool | |
213 commutative_constraint_p (const char *str) | |
214 { | |
215 bool ignore_p; | |
216 int c; | |
217 | |
218 for (ignore_p = false;;) | |
219 { | |
220 c = *str; | |
221 if (c == '\0') | |
222 break; | |
223 str += CONSTRAINT_LEN (c, str); | |
224 if (c == '#') | |
225 ignore_p = true; | |
226 else if (c == ',') | |
227 ignore_p = false; | |
228 else if (! ignore_p) | |
229 { | |
230 /* Usually `%' is the first constraint character but the | |
231 documentation does not require this. */ | |
232 if (c == '%') | |
233 return true; | |
234 } | |
235 } | |
236 return false; | |
237 } | |
238 | |
239 /* Return the number of the operand which should be the same in any | |
240 case as operand with number OP_NUM (or negative value if there is | |
241 no such operand). If USE_COMMUT_OP_P is TRUE, the function makes | |
242 temporarily commutative operand exchange before this. The function | |
243 takes only really possible alternatives into consideration. */ | |
244 static int | |
245 get_dup_num (int op_num, bool use_commut_op_p) | |
246 { | |
247 int curr_alt, c, original, dup; | |
248 bool ignore_p, commut_op_used_p; | |
249 const char *str; | |
250 rtx op; | |
251 | |
252 if (op_num < 0 || recog_data.n_alternatives == 0) | |
253 return -1; | |
254 op = recog_data.operand[op_num]; | |
255 commut_op_used_p = true; | |
256 if (use_commut_op_p) | |
257 { | |
258 if (commutative_constraint_p (recog_data.constraints[op_num])) | |
259 op_num++; | |
260 else if (op_num > 0 && commutative_constraint_p (recog_data.constraints | |
261 [op_num - 1])) | |
262 op_num--; | |
263 else | |
264 commut_op_used_p = false; | |
265 } | |
266 str = recog_data.constraints[op_num]; | |
267 for (ignore_p = false, original = -1, curr_alt = 0;;) | |
268 { | |
269 c = *str; | |
270 if (c == '\0') | |
271 break; | |
272 if (c == '#') | |
273 ignore_p = true; | |
274 else if (c == ',') | |
275 { | |
276 curr_alt++; | |
277 ignore_p = false; | |
278 } | |
279 else if (! ignore_p) | |
280 switch (c) | |
281 { | |
282 case 'X': | |
283 return -1; | |
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284 |
0 | 285 case 'm': |
286 case 'o': | |
287 /* Accept a register which might be placed in memory. */ | |
288 return -1; | |
289 break; | |
290 | |
291 case 'V': | |
292 case '<': | |
293 case '>': | |
294 break; | |
295 | |
296 case 'p': | |
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297 if (address_operand (op, VOIDmode)) |
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298 return -1; |
0 | 299 break; |
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300 |
0 | 301 case 'g': |
302 return -1; | |
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303 |
0 | 304 case 'r': |
305 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': | |
306 case 'h': case 'j': case 'k': case 'l': | |
307 case 'q': case 't': case 'u': | |
308 case 'v': case 'w': case 'x': case 'y': case 'z': | |
309 case 'A': case 'B': case 'C': case 'D': | |
310 case 'Q': case 'R': case 'S': case 'T': case 'U': | |
311 case 'W': case 'Y': case 'Z': | |
312 { | |
313 enum reg_class cl; | |
314 | |
315 cl = (c == 'r' | |
316 ? GENERAL_REGS : REG_CLASS_FROM_CONSTRAINT (c, str)); | |
317 if (cl != NO_REGS) | |
318 return -1; | |
319 #ifdef EXTRA_CONSTRAINT_STR | |
320 else if (EXTRA_CONSTRAINT_STR (op, c, str)) | |
321 return -1; | |
322 #endif | |
323 break; | |
324 } | |
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325 |
0 | 326 case '0': case '1': case '2': case '3': case '4': |
327 case '5': case '6': case '7': case '8': case '9': | |
328 if (original != -1 && original != c) | |
329 return -1; | |
330 original = c; | |
331 break; | |
332 } | |
333 str += CONSTRAINT_LEN (c, str); | |
334 } | |
335 if (original == -1) | |
336 return -1; | |
337 dup = original - '0'; | |
338 if (use_commut_op_p) | |
339 { | |
340 if (commutative_constraint_p (recog_data.constraints[dup])) | |
341 dup++; | |
342 else if (dup > 0 | |
343 && commutative_constraint_p (recog_data.constraints[dup -1])) | |
344 dup--; | |
345 else if (! commut_op_used_p) | |
346 return -1; | |
347 } | |
348 return dup; | |
349 } | |
350 | |
351 /* Check that X is REG or SUBREG of REG. */ | |
352 #define REG_SUBREG_P(x) \ | |
353 (REG_P (x) || (GET_CODE (x) == SUBREG && REG_P (SUBREG_REG (x)))) | |
354 | |
355 /* Return X if X is a REG, otherwise it should be SUBREG of REG and | |
356 the function returns the reg in this case. *OFFSET will be set to | |
357 0 in the first case or the regno offset in the first case. */ | |
358 static rtx | |
359 go_through_subreg (rtx x, int *offset) | |
360 { | |
361 rtx reg; | |
362 | |
363 *offset = 0; | |
364 if (REG_P (x)) | |
365 return x; | |
366 ira_assert (GET_CODE (x) == SUBREG); | |
367 reg = SUBREG_REG (x); | |
368 ira_assert (REG_P (reg)); | |
369 if (REGNO (reg) < FIRST_PSEUDO_REGISTER) | |
370 *offset = subreg_regno_offset (REGNO (reg), GET_MODE (reg), | |
371 SUBREG_BYTE (x), GET_MODE (x)); | |
372 else | |
373 *offset = (SUBREG_BYTE (x) / REGMODE_NATURAL_SIZE (GET_MODE (x))); | |
374 return reg; | |
375 } | |
376 | |
377 /* Process registers REG1 and REG2 in move INSN with execution | |
378 frequency FREQ. The function also processes the registers in a | |
379 potential move insn (INSN == NULL in this case) with frequency | |
380 FREQ. The function can modify hard register costs of the | |
381 corresponding allocnos or create a copy involving the corresponding | |
382 allocnos. The function does nothing if the both registers are hard | |
383 registers. When nothing is changed, the function returns | |
384 FALSE. */ | |
385 static bool | |
386 process_regs_for_copy (rtx reg1, rtx reg2, bool constraint_p, | |
387 rtx insn, int freq) | |
388 { | |
389 int allocno_preferenced_hard_regno, cost, index, offset1, offset2; | |
390 bool only_regs_p; | |
391 ira_allocno_t a; | |
392 enum reg_class rclass, cover_class; | |
393 enum machine_mode mode; | |
394 ira_copy_t cp; | |
395 | |
396 gcc_assert (REG_SUBREG_P (reg1) && REG_SUBREG_P (reg2)); | |
397 only_regs_p = REG_P (reg1) && REG_P (reg2); | |
398 reg1 = go_through_subreg (reg1, &offset1); | |
399 reg2 = go_through_subreg (reg2, &offset2); | |
400 /* Set up hard regno preferenced by allocno. If allocno gets the | |
401 hard regno the copy (or potential move) insn will be removed. */ | |
402 if (HARD_REGISTER_P (reg1)) | |
403 { | |
404 if (HARD_REGISTER_P (reg2)) | |
405 return false; | |
406 allocno_preferenced_hard_regno = REGNO (reg1) + offset1 - offset2; | |
407 a = ira_curr_regno_allocno_map[REGNO (reg2)]; | |
408 } | |
409 else if (HARD_REGISTER_P (reg2)) | |
410 { | |
411 allocno_preferenced_hard_regno = REGNO (reg2) + offset2 - offset1; | |
412 a = ira_curr_regno_allocno_map[REGNO (reg1)]; | |
413 } | |
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414 else |
0 | 415 { |
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416 ira_allocno_t a1 = ira_curr_regno_allocno_map[REGNO (reg1)]; |
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417 ira_allocno_t a2 = ira_curr_regno_allocno_map[REGNO (reg2)]; |
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418 if (!allocnos_conflict_for_copy_p (a1, a2) && offset1 == offset2) |
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419 { |
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420 cp = ira_add_allocno_copy (a1, a2, freq, constraint_p, insn, |
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421 ira_curr_loop_tree_node); |
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422 bitmap_set_bit (ira_curr_loop_tree_node->local_copies, cp->num); |
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423 return true; |
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424 } |
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425 else |
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426 return false; |
0 | 427 } |
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428 |
0 | 429 if (! IN_RANGE (allocno_preferenced_hard_regno, 0, FIRST_PSEUDO_REGISTER - 1)) |
430 /* Can not be tied. */ | |
431 return false; | |
432 rclass = REGNO_REG_CLASS (allocno_preferenced_hard_regno); | |
433 mode = ALLOCNO_MODE (a); | |
434 cover_class = ALLOCNO_COVER_CLASS (a); | |
435 if (only_regs_p && insn != NULL_RTX | |
436 && reg_class_size[rclass] <= (unsigned) CLASS_MAX_NREGS (rclass, mode)) | |
437 /* It is already taken into account in ira-costs.c. */ | |
438 return false; | |
439 index = ira_class_hard_reg_index[cover_class][allocno_preferenced_hard_regno]; | |
440 if (index < 0) | |
441 /* Can not be tied. It is not in the cover class. */ | |
442 return false; | |
443 if (HARD_REGISTER_P (reg1)) | |
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444 cost = ira_get_register_move_cost (mode, cover_class, rclass) * freq; |
0 | 445 else |
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446 cost = ira_get_register_move_cost (mode, rclass, cover_class) * freq; |
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447 do |
0 | 448 { |
449 ira_allocate_and_set_costs | |
450 (&ALLOCNO_HARD_REG_COSTS (a), cover_class, | |
451 ALLOCNO_COVER_CLASS_COST (a)); | |
452 ira_allocate_and_set_costs | |
453 (&ALLOCNO_CONFLICT_HARD_REG_COSTS (a), cover_class, 0); | |
454 ALLOCNO_HARD_REG_COSTS (a)[index] -= cost; | |
455 ALLOCNO_CONFLICT_HARD_REG_COSTS (a)[index] -= cost; | |
456 if (ALLOCNO_HARD_REG_COSTS (a)[index] < ALLOCNO_COVER_CLASS_COST (a)) | |
457 ALLOCNO_COVER_CLASS_COST (a) = ALLOCNO_HARD_REG_COSTS (a)[index]; | |
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458 a = ira_parent_or_cap_allocno (a); |
0 | 459 } |
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460 while (a != NULL); |
0 | 461 return true; |
462 } | |
463 | |
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464 /* Process all of the output registers of the current insn which are |
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465 not bound (BOUND_P) and the input register REG (its operand number |
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466 OP_NUM) which dies in the insn as if there were a move insn between |
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467 them with frequency FREQ. */ |
0 | 468 static void |
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469 process_reg_shuffles (rtx reg, int op_num, int freq, bool *bound_p) |
0 | 470 { |
471 int i; | |
472 rtx another_reg; | |
473 | |
474 gcc_assert (REG_SUBREG_P (reg)); | |
475 for (i = 0; i < recog_data.n_operands; i++) | |
476 { | |
477 another_reg = recog_data.operand[i]; | |
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478 |
0 | 479 if (!REG_SUBREG_P (another_reg) || op_num == i |
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480 || recog_data.operand_type[i] != OP_OUT |
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481 || bound_p[i]) |
0 | 482 continue; |
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483 |
0 | 484 process_regs_for_copy (reg, another_reg, false, NULL_RTX, freq); |
485 } | |
486 } | |
487 | |
488 /* Process INSN and create allocno copies if necessary. For example, | |
489 it might be because INSN is a pseudo-register move or INSN is two | |
490 operand insn. */ | |
491 static void | |
492 add_insn_allocno_copies (rtx insn) | |
493 { | |
494 rtx set, operand, dup; | |
495 const char *str; | |
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496 bool commut_p, bound_p[MAX_RECOG_OPERANDS]; |
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497 int i, j, n, freq; |
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498 |
0 | 499 freq = REG_FREQ_FROM_BB (BLOCK_FOR_INSN (insn)); |
500 if (freq == 0) | |
501 freq = 1; | |
502 if ((set = single_set (insn)) != NULL_RTX | |
503 && REG_SUBREG_P (SET_DEST (set)) && REG_SUBREG_P (SET_SRC (set)) | |
504 && ! side_effects_p (set) | |
505 && find_reg_note (insn, REG_DEAD, | |
506 REG_P (SET_SRC (set)) | |
507 ? SET_SRC (set) | |
508 : SUBREG_REG (SET_SRC (set))) != NULL_RTX) | |
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509 { |
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510 process_regs_for_copy (SET_DEST (set), SET_SRC (set), false, insn, freq); |
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511 return; |
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512 } |
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513 /* Fast check of possibility of constraint or shuffle copies. If |
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514 there are no dead registers, there will be no such copies. */ |
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515 if (! find_reg_note (insn, REG_DEAD, NULL_RTX)) |
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516 return; |
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517 extract_insn (insn); |
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518 for (i = 0; i < recog_data.n_operands; i++) |
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519 bound_p[i] = false; |
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520 for (i = 0; i < recog_data.n_operands; i++) |
0 | 521 { |
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522 operand = recog_data.operand[i]; |
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523 if (! REG_SUBREG_P (operand)) |
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524 continue; |
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525 str = recog_data.constraints[i]; |
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526 while (*str == ' ' || *str == '\t') |
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527 str++; |
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528 for (j = 0, commut_p = false; j < 2; j++, commut_p = true) |
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529 if ((n = get_dup_num (i, commut_p)) >= 0) |
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530 { |
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531 bound_p[n] = true; |
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532 dup = recog_data.operand[n]; |
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533 if (REG_SUBREG_P (dup) |
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534 && find_reg_note (insn, REG_DEAD, |
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535 REG_P (operand) |
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536 ? operand |
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537 : SUBREG_REG (operand)) != NULL_RTX) |
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538 process_regs_for_copy (operand, dup, true, NULL_RTX, freq); |
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539 } |
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540 } |
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541 for (i = 0; i < recog_data.n_operands; i++) |
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542 { |
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543 operand = recog_data.operand[i]; |
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544 if (REG_SUBREG_P (operand) |
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545 && find_reg_note (insn, REG_DEAD, |
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546 REG_P (operand) |
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547 ? operand : SUBREG_REG (operand)) != NULL_RTX) |
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548 /* If an operand dies, prefer its hard register for the output |
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549 operands by decreasing the hard register cost or creating |
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550 the corresponding allocno copies. The cost will not |
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551 correspond to a real move insn cost, so make the frequency |
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552 smaller. */ |
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553 process_reg_shuffles (operand, i, freq < 8 ? 1 : freq / 8, bound_p); |
0 | 554 } |
555 } | |
556 | |
557 /* Add copies originated from BB given by LOOP_TREE_NODE. */ | |
558 static void | |
559 add_copies (ira_loop_tree_node_t loop_tree_node) | |
560 { | |
561 basic_block bb; | |
562 rtx insn; | |
563 | |
564 bb = loop_tree_node->bb; | |
565 if (bb == NULL) | |
566 return; | |
567 FOR_BB_INSNS (bb, insn) | |
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568 if (NONDEBUG_INSN_P (insn)) |
0 | 569 add_insn_allocno_copies (insn); |
570 } | |
571 | |
572 /* Propagate copies the corresponding allocnos on upper loop tree | |
573 level. */ | |
574 static void | |
575 propagate_copies (void) | |
576 { | |
577 ira_copy_t cp; | |
578 ira_copy_iterator ci; | |
579 ira_allocno_t a1, a2, parent_a1, parent_a2; | |
580 | |
581 FOR_EACH_COPY (cp, ci) | |
582 { | |
583 a1 = cp->first; | |
584 a2 = cp->second; | |
585 if (ALLOCNO_LOOP_TREE_NODE (a1) == ira_loop_tree_root) | |
586 continue; | |
587 ira_assert ((ALLOCNO_LOOP_TREE_NODE (a2) != ira_loop_tree_root)); | |
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588 parent_a1 = ira_parent_or_cap_allocno (a1); |
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589 parent_a2 = ira_parent_or_cap_allocno (a2); |
0 | 590 ira_assert (parent_a1 != NULL && parent_a2 != NULL); |
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591 if (! allocnos_conflict_for_copy_p (parent_a1, parent_a2)) |
0 | 592 ira_add_allocno_copy (parent_a1, parent_a2, cp->freq, |
593 cp->constraint_p, cp->insn, cp->loop_tree_node); | |
594 } | |
595 } | |
596 | |
597 /* Array used to collect all conflict allocnos for given allocno. */ | |
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598 static ira_object_t *collected_conflict_objects; |
0 | 599 |
600 /* Build conflict vectors or bit conflict vectors (whatever is more | |
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601 profitable) for object OBJ from the conflict table. */ |
0 | 602 static void |
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603 build_object_conflicts (ira_object_t obj) |
0 | 604 { |
605 int i, px, parent_num; | |
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606 ira_allocno_t parent_a, another_parent_a; |
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607 ira_object_t parent_obj; |
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608 ira_allocno_t a = OBJECT_ALLOCNO (obj); |
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609 IRA_INT_TYPE *object_conflicts; |
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610 minmax_set_iterator asi; |
0 | 611 |
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612 object_conflicts = conflicts[OBJECT_CONFLICT_ID (obj)]; |
0 | 613 px = 0; |
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614 FOR_EACH_BIT_IN_MINMAX_SET (object_conflicts, |
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615 OBJECT_MIN (obj), OBJECT_MAX (obj), i, asi) |
0 | 616 { |
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617 ira_object_t another_obj = ira_object_id_map[i]; |
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618 ira_allocno_t another_a = OBJECT_ALLOCNO (obj); |
0 | 619 ira_assert (ira_reg_classes_intersect_p |
620 [ALLOCNO_COVER_CLASS (a)][ALLOCNO_COVER_CLASS (another_a)]); | |
67
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621 collected_conflict_objects[px++] = another_obj; |
0 | 622 } |
67
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623 if (ira_conflict_vector_profitable_p (obj, px)) |
0 | 624 { |
67
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625 ira_object_t *vec; |
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626 ira_allocate_conflict_vec (obj, px); |
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627 vec = OBJECT_CONFLICT_VEC (obj); |
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628 memcpy (vec, collected_conflict_objects, sizeof (ira_object_t) * px); |
0 | 629 vec[px] = NULL; |
67
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630 OBJECT_NUM_CONFLICTS (obj) = px; |
0 | 631 } |
632 else | |
633 { | |
67
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634 int conflict_bit_vec_words_num; |
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635 OBJECT_CONFLICT_ARRAY (obj) = object_conflicts; |
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636 if (OBJECT_MAX (obj) < OBJECT_MIN (obj)) |
0 | 637 conflict_bit_vec_words_num = 0; |
638 else | |
639 conflict_bit_vec_words_num | |
67
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640 = ((OBJECT_MAX (obj) - OBJECT_MIN (obj) + IRA_INT_BITS) |
0 | 641 / IRA_INT_BITS); |
67
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642 OBJECT_CONFLICT_ARRAY_SIZE (obj) |
0 | 643 = conflict_bit_vec_words_num * sizeof (IRA_INT_TYPE); |
644 } | |
67
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645 |
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646 parent_a = ira_parent_or_cap_allocno (a); |
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647 if (parent_a == NULL) |
0 | 648 return; |
649 ira_assert (ALLOCNO_COVER_CLASS (a) == ALLOCNO_COVER_CLASS (parent_a)); | |
67
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650 ira_assert (ALLOCNO_NUM_OBJECTS (a) == ALLOCNO_NUM_OBJECTS (parent_a)); |
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651 parent_obj = ALLOCNO_OBJECT (parent_a, OBJECT_SUBWORD (obj)); |
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652 parent_num = OBJECT_CONFLICT_ID (parent_obj); |
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653 FOR_EACH_BIT_IN_MINMAX_SET (object_conflicts, |
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654 OBJECT_MIN (obj), OBJECT_MAX (obj), i, asi) |
0 | 655 { |
67
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656 ira_object_t another_obj = ira_object_id_map[i]; |
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657 ira_allocno_t another_a = OBJECT_ALLOCNO (another_obj); |
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658 int another_word = OBJECT_SUBWORD (another_obj); |
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659 |
0 | 660 ira_assert (ira_reg_classes_intersect_p |
661 [ALLOCNO_COVER_CLASS (a)][ALLOCNO_COVER_CLASS (another_a)]); | |
67
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662 |
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663 another_parent_a = ira_parent_or_cap_allocno (another_a); |
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664 if (another_parent_a == NULL) |
0 | 665 continue; |
666 ira_assert (ALLOCNO_NUM (another_parent_a) >= 0); | |
667 ira_assert (ALLOCNO_COVER_CLASS (another_a) | |
668 == ALLOCNO_COVER_CLASS (another_parent_a)); | |
67
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669 ira_assert (ALLOCNO_NUM_OBJECTS (another_a) |
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670 == ALLOCNO_NUM_OBJECTS (another_parent_a)); |
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671 SET_MINMAX_SET_BIT (conflicts[parent_num], |
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672 OBJECT_CONFLICT_ID (ALLOCNO_OBJECT (another_parent_a, |
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673 another_word)), |
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674 OBJECT_MIN (parent_obj), |
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675 OBJECT_MAX (parent_obj)); |
0 | 676 } |
677 } | |
678 | |
679 /* Build conflict vectors or bit conflict vectors (whatever is more | |
680 profitable) of all allocnos from the conflict table. */ | |
681 static void | |
682 build_conflicts (void) | |
683 { | |
684 int i; | |
685 ira_allocno_t a, cap; | |
686 | |
67
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687 collected_conflict_objects |
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688 = (ira_object_t *) ira_allocate (sizeof (ira_object_t) |
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689 * ira_objects_num); |
0 | 690 for (i = max_reg_num () - 1; i >= FIRST_PSEUDO_REGISTER; i--) |
691 for (a = ira_regno_allocno_map[i]; | |
692 a != NULL; | |
693 a = ALLOCNO_NEXT_REGNO_ALLOCNO (a)) | |
694 { | |
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695 int j, nregs = ALLOCNO_NUM_OBJECTS (a); |
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696 for (j = 0; j < nregs; j++) |
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697 { |
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698 ira_object_t obj = ALLOCNO_OBJECT (a, j); |
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699 build_object_conflicts (obj); |
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700 for (cap = ALLOCNO_CAP (a); cap != NULL; cap = ALLOCNO_CAP (cap)) |
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701 { |
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702 ira_object_t cap_obj = ALLOCNO_OBJECT (cap, j); |
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703 gcc_assert (ALLOCNO_NUM_OBJECTS (cap) == ALLOCNO_NUM_OBJECTS (a)); |
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704 build_object_conflicts (cap_obj); |
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705 } |
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706 } |
0 | 707 } |
67
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708 ira_free (collected_conflict_objects); |
0 | 709 } |
710 | |
711 | |
712 | |
713 /* Print hard reg set SET with TITLE to FILE. */ | |
714 static void | |
715 print_hard_reg_set (FILE *file, const char *title, HARD_REG_SET set) | |
716 { | |
717 int i, start; | |
718 | |
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719 fputs (title, file); |
0 | 720 for (start = -1, i = 0; i < FIRST_PSEUDO_REGISTER; i++) |
721 { | |
722 if (TEST_HARD_REG_BIT (set, i)) | |
723 { | |
724 if (i == 0 || ! TEST_HARD_REG_BIT (set, i - 1)) | |
725 start = i; | |
726 } | |
727 if (start >= 0 | |
728 && (i == FIRST_PSEUDO_REGISTER - 1 || ! TEST_HARD_REG_BIT (set, i))) | |
729 { | |
730 if (start == i - 1) | |
731 fprintf (file, " %d", start); | |
732 else if (start == i - 2) | |
733 fprintf (file, " %d %d", start, start + 1); | |
734 else | |
735 fprintf (file, " %d-%d", start, i - 1); | |
736 start = -1; | |
737 } | |
738 } | |
55
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739 putc ('\n', file); |
0 | 740 } |
741 | |
63
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742 static void |
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743 print_allocno_conflicts (FILE * file, bool reg_p, ira_allocno_t a) |
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744 { |
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745 HARD_REG_SET conflicting_hard_regs; |
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746 basic_block bb; |
67
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747 int n, i; |
63
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748 |
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749 if (reg_p) |
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750 fprintf (file, ";; r%d", ALLOCNO_REGNO (a)); |
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751 else |
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752 { |
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753 fprintf (file, ";; a%d(r%d,", ALLOCNO_NUM (a), ALLOCNO_REGNO (a)); |
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754 if ((bb = ALLOCNO_LOOP_TREE_NODE (a)->bb) != NULL) |
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755 fprintf (file, "b%d", bb->index); |
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756 else |
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757 fprintf (file, "l%d", ALLOCNO_LOOP_TREE_NODE (a)->loop->num); |
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758 putc (')', file); |
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759 } |
67
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760 |
63
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761 fputs (" conflicts:", file); |
67
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762 n = ALLOCNO_NUM_OBJECTS (a); |
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763 for (i = 0; i < n; i++) |
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764 { |
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765 ira_object_t obj = ALLOCNO_OBJECT (a, i); |
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766 ira_object_t conflict_obj; |
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767 ira_object_conflict_iterator oci; |
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768 |
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769 if (OBJECT_CONFLICT_ARRAY (obj) == NULL) |
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770 continue; |
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771 if (n > 1) |
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772 fprintf (file, "\n;; subobject %d:", i); |
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773 FOR_EACH_OBJECT_CONFLICT (obj, conflict_obj, oci) |
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774 { |
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775 ira_allocno_t conflict_a = OBJECT_ALLOCNO (conflict_obj); |
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776 if (reg_p) |
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777 fprintf (file, " r%d,", ALLOCNO_REGNO (conflict_a)); |
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778 else |
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779 { |
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780 fprintf (file, " a%d(r%d", ALLOCNO_NUM (conflict_a), |
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781 ALLOCNO_REGNO (conflict_a)); |
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782 if (ALLOCNO_NUM_OBJECTS (conflict_a) > 1) |
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783 fprintf (file, ",w%d", OBJECT_SUBWORD (conflict_obj)); |
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784 if ((bb = ALLOCNO_LOOP_TREE_NODE (conflict_a)->bb) != NULL) |
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785 fprintf (file, ",b%d", bb->index); |
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786 else |
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787 fprintf (file, ",l%d", |
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788 ALLOCNO_LOOP_TREE_NODE (conflict_a)->loop->num); |
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789 putc (')', file); |
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790 } |
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791 } |
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792 COPY_HARD_REG_SET (conflicting_hard_regs, OBJECT_TOTAL_CONFLICT_HARD_REGS (obj)); |
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793 AND_COMPL_HARD_REG_SET (conflicting_hard_regs, ira_no_alloc_regs); |
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794 AND_HARD_REG_SET (conflicting_hard_regs, |
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795 reg_class_contents[ALLOCNO_COVER_CLASS (a)]); |
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796 print_hard_reg_set (file, "\n;; total conflict hard regs:", |
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797 conflicting_hard_regs); |
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798 |
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799 COPY_HARD_REG_SET (conflicting_hard_regs, OBJECT_CONFLICT_HARD_REGS (obj)); |
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800 AND_COMPL_HARD_REG_SET (conflicting_hard_regs, ira_no_alloc_regs); |
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801 AND_HARD_REG_SET (conflicting_hard_regs, |
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802 reg_class_contents[ALLOCNO_COVER_CLASS (a)]); |
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803 print_hard_reg_set (file, ";; conflict hard regs:", |
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804 conflicting_hard_regs); |
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805 putc ('\n', file); |
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806 } |
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807 |
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808 } |
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809 |
0 | 810 /* Print information about allocno or only regno (if REG_P) conflicts |
811 to FILE. */ | |
812 static void | |
813 print_conflicts (FILE *file, bool reg_p) | |
814 { | |
815 ira_allocno_t a; | |
816 ira_allocno_iterator ai; | |
817 | |
818 FOR_EACH_ALLOCNO (a, ai) | |
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819 print_allocno_conflicts (file, reg_p, a); |
0 | 820 } |
821 | |
822 /* Print information about allocno or only regno (if REG_P) conflicts | |
823 to stderr. */ | |
824 void | |
825 ira_debug_conflicts (bool reg_p) | |
826 { | |
827 print_conflicts (stderr, reg_p); | |
828 } | |
829 | |
830 | |
831 | |
832 /* Entry function which builds allocno conflicts and allocno copies | |
833 and accumulate some allocno info on upper level regions. */ | |
834 void | |
835 ira_build_conflicts (void) | |
836 { | |
837 ira_allocno_t a; | |
838 ira_allocno_iterator ai; | |
839 HARD_REG_SET temp_hard_reg_set; | |
840 | |
841 if (ira_conflicts_p) | |
842 { | |
843 ira_conflicts_p = build_conflict_bit_table (); | |
844 if (ira_conflicts_p) | |
845 { | |
67
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846 ira_object_t obj; |
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847 ira_object_iterator oi; |
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848 |
0 | 849 build_conflicts (); |
850 ira_traverse_loop_tree (true, ira_loop_tree_root, NULL, add_copies); | |
851 /* We need finished conflict table for the subsequent call. */ | |
852 if (flag_ira_region == IRA_REGION_ALL | |
853 || flag_ira_region == IRA_REGION_MIXED) | |
854 propagate_copies (); | |
67
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855 |
0 | 856 /* Now we can free memory for the conflict table (see function |
67
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857 build_object_conflicts for details). */ |
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858 FOR_EACH_OBJECT (obj, oi) |
0 | 859 { |
67
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860 if (OBJECT_CONFLICT_ARRAY (obj) != conflicts[OBJECT_CONFLICT_ID (obj)]) |
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861 ira_free (conflicts[OBJECT_CONFLICT_ID (obj)]); |
0 | 862 } |
863 ira_free (conflicts); | |
864 } | |
865 } | |
67
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866 if (! targetm.class_likely_spilled_p (base_reg_class (VOIDmode, ADDRESS, |
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867 SCRATCH))) |
0 | 868 CLEAR_HARD_REG_SET (temp_hard_reg_set); |
869 else | |
870 { | |
871 COPY_HARD_REG_SET (temp_hard_reg_set, | |
872 reg_class_contents[base_reg_class (VOIDmode, ADDRESS, SCRATCH)]); | |
873 AND_COMPL_HARD_REG_SET (temp_hard_reg_set, ira_no_alloc_regs); | |
874 AND_HARD_REG_SET (temp_hard_reg_set, call_used_reg_set); | |
875 } | |
876 FOR_EACH_ALLOCNO (a, ai) | |
877 { | |
67
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878 int i, n = ALLOCNO_NUM_OBJECTS (a); |
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879 for (i = 0; i < n; i++) |
0 | 880 { |
67
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881 ira_object_t obj = ALLOCNO_OBJECT (a, i); |
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882 reg_attrs *attrs = REG_ATTRS (regno_reg_rtx [ALLOCNO_REGNO (a)]); |
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883 tree decl; |
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884 |
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885 if ((! flag_caller_saves && ALLOCNO_CALLS_CROSSED_NUM (a) != 0) |
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886 /* For debugging purposes don't put user defined variables in |
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887 callee-clobbered registers. */ |
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888 || (optimize == 0 |
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889 && attrs != NULL |
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890 && (decl = attrs->decl) != NULL |
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891 && VAR_OR_FUNCTION_DECL_P (decl) |
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892 && ! DECL_ARTIFICIAL (decl))) |
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893 { |
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894 IOR_HARD_REG_SET (OBJECT_TOTAL_CONFLICT_HARD_REGS (obj), |
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895 call_used_reg_set); |
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896 IOR_HARD_REG_SET (OBJECT_CONFLICT_HARD_REGS (obj), |
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897 call_used_reg_set); |
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898 } |
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899 else if (ALLOCNO_CALLS_CROSSED_NUM (a) != 0) |
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900 { |
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901 IOR_HARD_REG_SET (OBJECT_TOTAL_CONFLICT_HARD_REGS (obj), |
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902 no_caller_save_reg_set); |
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903 IOR_HARD_REG_SET (OBJECT_TOTAL_CONFLICT_HARD_REGS (obj), |
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904 temp_hard_reg_set); |
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905 IOR_HARD_REG_SET (OBJECT_CONFLICT_HARD_REGS (obj), |
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906 no_caller_save_reg_set); |
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907 IOR_HARD_REG_SET (OBJECT_CONFLICT_HARD_REGS (obj), |
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908 temp_hard_reg_set); |
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909 } |
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910 |
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911 if (ALLOCNO_CALLS_CROSSED_NUM (a) != 0) |
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912 { |
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913 int regno; |
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914 |
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915 /* Allocnos bigger than the saved part of call saved |
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916 regs must conflict with them. */ |
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917 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) |
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918 if (!TEST_HARD_REG_BIT (call_used_reg_set, regno) |
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919 && HARD_REGNO_CALL_PART_CLOBBERED (regno, |
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920 obj->allocno->mode)) |
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921 { |
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922 SET_HARD_REG_BIT (OBJECT_CONFLICT_HARD_REGS (obj), regno); |
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923 SET_HARD_REG_BIT (OBJECT_TOTAL_CONFLICT_HARD_REGS (obj), |
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924 regno); |
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925 } |
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926 } |
0 | 927 } |
928 } | |
929 if (optimize && ira_conflicts_p | |
930 && internal_flag_ira_verbose > 2 && ira_dump_file != NULL) | |
931 print_conflicts (ira_dump_file, false); | |
932 } |