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annotate gcc/tree-ssa-loop-manip.c @ 63:b7f97abdc517 gcc-4.6-20100522
update gcc from gcc-4.5.0 to gcc-4.6
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Mon, 24 May 2010 12:47:05 +0900 |
parents | 77e2b8dfacca |
children | f6334be47118 |
rev | line source |
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0 | 1 /* High-level loop manipulation functions. |
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2 Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 |
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3 Free Software Foundation, Inc. |
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4 |
0 | 5 This file is part of GCC. |
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6 |
0 | 7 GCC is free software; you can redistribute it and/or modify it |
8 under the terms of the GNU General Public License as published by the | |
9 Free Software Foundation; either version 3, or (at your option) any | |
10 later version. | |
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11 |
0 | 12 GCC is distributed in the hope that it will be useful, but WITHOUT |
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
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16 |
0 | 17 You should have received a copy of the GNU General Public License |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 #include "config.h" | |
22 #include "system.h" | |
23 #include "coretypes.h" | |
24 #include "tm.h" | |
25 #include "tree.h" | |
26 #include "tm_p.h" | |
27 #include "basic-block.h" | |
28 #include "output.h" | |
29 #include "diagnostic.h" | |
30 #include "tree-flow.h" | |
31 #include "tree-dump.h" | |
32 #include "timevar.h" | |
33 #include "cfgloop.h" | |
34 #include "tree-pass.h" | |
35 #include "cfglayout.h" | |
36 #include "tree-scalar-evolution.h" | |
37 #include "params.h" | |
38 #include "tree-inline.h" | |
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39 #include "langhooks.h" |
0 | 40 |
41 /* Creates an induction variable with value BASE + STEP * iteration in LOOP. | |
42 It is expected that neither BASE nor STEP are shared with other expressions | |
43 (unless the sharing rules allow this). Use VAR as a base var_decl for it | |
44 (if NULL, a new temporary will be created). The increment will occur at | |
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45 INCR_POS (after it if AFTER is true, before it otherwise). INCR_POS and |
0 | 46 AFTER can be computed using standard_iv_increment_position. The ssa versions |
47 of the variable before and after increment will be stored in VAR_BEFORE and | |
48 VAR_AFTER (unless they are NULL). */ | |
49 | |
50 void | |
51 create_iv (tree base, tree step, tree var, struct loop *loop, | |
52 gimple_stmt_iterator *incr_pos, bool after, | |
53 tree *var_before, tree *var_after) | |
54 { | |
55 gimple stmt; | |
56 tree initial, step1; | |
57 gimple_seq stmts; | |
58 tree vb, va; | |
59 enum tree_code incr_op = PLUS_EXPR; | |
60 edge pe = loop_preheader_edge (loop); | |
61 | |
62 if (!var) | |
63 { | |
64 var = create_tmp_var (TREE_TYPE (base), "ivtmp"); | |
65 add_referenced_var (var); | |
66 } | |
67 | |
68 vb = make_ssa_name (var, NULL); | |
69 if (var_before) | |
70 *var_before = vb; | |
71 va = make_ssa_name (var, NULL); | |
72 if (var_after) | |
73 *var_after = va; | |
74 | |
75 /* For easier readability of the created code, produce MINUS_EXPRs | |
76 when suitable. */ | |
77 if (TREE_CODE (step) == INTEGER_CST) | |
78 { | |
79 if (TYPE_UNSIGNED (TREE_TYPE (step))) | |
80 { | |
81 step1 = fold_build1 (NEGATE_EXPR, TREE_TYPE (step), step); | |
82 if (tree_int_cst_lt (step1, step)) | |
83 { | |
84 incr_op = MINUS_EXPR; | |
85 step = step1; | |
86 } | |
87 } | |
88 else | |
89 { | |
90 bool ovf; | |
91 | |
92 if (!tree_expr_nonnegative_warnv_p (step, &ovf) | |
93 && may_negate_without_overflow_p (step)) | |
94 { | |
95 incr_op = MINUS_EXPR; | |
96 step = fold_build1 (NEGATE_EXPR, TREE_TYPE (step), step); | |
97 } | |
98 } | |
99 } | |
100 if (POINTER_TYPE_P (TREE_TYPE (base))) | |
101 { | |
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102 if (TREE_CODE (base) == ADDR_EXPR) |
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103 mark_addressable (TREE_OPERAND (base, 0)); |
0 | 104 step = fold_convert (sizetype, step); |
105 if (incr_op == MINUS_EXPR) | |
106 step = fold_build1 (NEGATE_EXPR, sizetype, step); | |
107 incr_op = POINTER_PLUS_EXPR; | |
108 } | |
109 /* Gimplify the step if necessary. We put the computations in front of the | |
110 loop (i.e. the step should be loop invariant). */ | |
111 step = force_gimple_operand (step, &stmts, true, NULL_TREE); | |
112 if (stmts) | |
113 gsi_insert_seq_on_edge_immediate (pe, stmts); | |
114 | |
115 stmt = gimple_build_assign_with_ops (incr_op, va, vb, step); | |
116 if (after) | |
117 gsi_insert_after (incr_pos, stmt, GSI_NEW_STMT); | |
118 else | |
119 gsi_insert_before (incr_pos, stmt, GSI_NEW_STMT); | |
120 | |
121 initial = force_gimple_operand (base, &stmts, true, var); | |
122 if (stmts) | |
123 gsi_insert_seq_on_edge_immediate (pe, stmts); | |
124 | |
125 stmt = create_phi_node (vb, loop->header); | |
126 SSA_NAME_DEF_STMT (vb) = stmt; | |
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127 add_phi_arg (stmt, initial, loop_preheader_edge (loop), UNKNOWN_LOCATION); |
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128 add_phi_arg (stmt, va, loop_latch_edge (loop), UNKNOWN_LOCATION); |
0 | 129 } |
130 | |
131 /* Add exit phis for the USE on EXIT. */ | |
132 | |
133 static void | |
134 add_exit_phis_edge (basic_block exit, tree use) | |
135 { | |
136 gimple phi, def_stmt = SSA_NAME_DEF_STMT (use); | |
137 basic_block def_bb = gimple_bb (def_stmt); | |
138 struct loop *def_loop; | |
139 edge e; | |
140 edge_iterator ei; | |
141 | |
142 /* Check that some of the edges entering the EXIT block exits a loop in | |
143 that USE is defined. */ | |
144 FOR_EACH_EDGE (e, ei, exit->preds) | |
145 { | |
146 def_loop = find_common_loop (def_bb->loop_father, e->src->loop_father); | |
147 if (!flow_bb_inside_loop_p (def_loop, e->dest)) | |
148 break; | |
149 } | |
150 | |
151 if (!e) | |
152 return; | |
153 | |
154 phi = create_phi_node (use, exit); | |
155 create_new_def_for (gimple_phi_result (phi), phi, | |
156 gimple_phi_result_ptr (phi)); | |
157 FOR_EACH_EDGE (e, ei, exit->preds) | |
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158 add_phi_arg (phi, use, e, UNKNOWN_LOCATION); |
0 | 159 } |
160 | |
161 /* Add exit phis for VAR that is used in LIVEIN. | |
162 Exits of the loops are stored in EXITS. */ | |
163 | |
164 static void | |
165 add_exit_phis_var (tree var, bitmap livein, bitmap exits) | |
166 { | |
167 bitmap def; | |
168 unsigned index; | |
169 basic_block def_bb = gimple_bb (SSA_NAME_DEF_STMT (var)); | |
170 bitmap_iterator bi; | |
171 | |
172 if (is_gimple_reg (var)) | |
173 bitmap_clear_bit (livein, def_bb->index); | |
174 else | |
175 bitmap_set_bit (livein, def_bb->index); | |
176 | |
177 def = BITMAP_ALLOC (NULL); | |
178 bitmap_set_bit (def, def_bb->index); | |
179 compute_global_livein (livein, def); | |
180 BITMAP_FREE (def); | |
181 | |
182 EXECUTE_IF_AND_IN_BITMAP (exits, livein, 0, index, bi) | |
183 { | |
184 add_exit_phis_edge (BASIC_BLOCK (index), var); | |
185 } | |
186 } | |
187 | |
188 /* Add exit phis for the names marked in NAMES_TO_RENAME. | |
189 Exits of the loops are stored in EXITS. Sets of blocks where the ssa | |
190 names are used are stored in USE_BLOCKS. */ | |
191 | |
192 static void | |
193 add_exit_phis (bitmap names_to_rename, bitmap *use_blocks, bitmap loop_exits) | |
194 { | |
195 unsigned i; | |
196 bitmap_iterator bi; | |
197 | |
198 EXECUTE_IF_SET_IN_BITMAP (names_to_rename, 0, i, bi) | |
199 { | |
200 add_exit_phis_var (ssa_name (i), use_blocks[i], loop_exits); | |
201 } | |
202 } | |
203 | |
204 /* Returns a bitmap of all loop exit edge targets. */ | |
205 | |
206 static bitmap | |
207 get_loops_exits (void) | |
208 { | |
209 bitmap exits = BITMAP_ALLOC (NULL); | |
210 basic_block bb; | |
211 edge e; | |
212 edge_iterator ei; | |
213 | |
214 FOR_EACH_BB (bb) | |
215 { | |
216 FOR_EACH_EDGE (e, ei, bb->preds) | |
217 if (e->src != ENTRY_BLOCK_PTR | |
218 && !flow_bb_inside_loop_p (e->src->loop_father, bb)) | |
219 { | |
220 bitmap_set_bit (exits, bb->index); | |
221 break; | |
222 } | |
223 } | |
224 | |
225 return exits; | |
226 } | |
227 | |
228 /* For USE in BB, if it is used outside of the loop it is defined in, | |
229 mark it for rewrite. Record basic block BB where it is used | |
230 to USE_BLOCKS. Record the ssa name index to NEED_PHIS bitmap. */ | |
231 | |
232 static void | |
233 find_uses_to_rename_use (basic_block bb, tree use, bitmap *use_blocks, | |
234 bitmap need_phis) | |
235 { | |
236 unsigned ver; | |
237 basic_block def_bb; | |
238 struct loop *def_loop; | |
239 | |
240 if (TREE_CODE (use) != SSA_NAME) | |
241 return; | |
242 | |
243 /* We don't need to keep virtual operands in loop-closed form. */ | |
244 if (!is_gimple_reg (use)) | |
245 return; | |
246 | |
247 ver = SSA_NAME_VERSION (use); | |
248 def_bb = gimple_bb (SSA_NAME_DEF_STMT (use)); | |
249 if (!def_bb) | |
250 return; | |
251 def_loop = def_bb->loop_father; | |
252 | |
253 /* If the definition is not inside a loop, it is not interesting. */ | |
254 if (!loop_outer (def_loop)) | |
255 return; | |
256 | |
257 /* If the use is not outside of the loop it is defined in, it is not | |
258 interesting. */ | |
259 if (flow_bb_inside_loop_p (def_loop, bb)) | |
260 return; | |
261 | |
262 if (!use_blocks[ver]) | |
263 use_blocks[ver] = BITMAP_ALLOC (NULL); | |
264 bitmap_set_bit (use_blocks[ver], bb->index); | |
265 | |
266 bitmap_set_bit (need_phis, ver); | |
267 } | |
268 | |
269 /* For uses in STMT, mark names that are used outside of the loop they are | |
270 defined to rewrite. Record the set of blocks in that the ssa | |
271 names are defined to USE_BLOCKS and the ssa names themselves to | |
272 NEED_PHIS. */ | |
273 | |
274 static void | |
275 find_uses_to_rename_stmt (gimple stmt, bitmap *use_blocks, bitmap need_phis) | |
276 { | |
277 ssa_op_iter iter; | |
278 tree var; | |
279 basic_block bb = gimple_bb (stmt); | |
280 | |
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281 if (is_gimple_debug (stmt)) |
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282 return; |
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283 |
0 | 284 FOR_EACH_SSA_TREE_OPERAND (var, stmt, iter, SSA_OP_ALL_USES) |
285 find_uses_to_rename_use (bb, var, use_blocks, need_phis); | |
286 } | |
287 | |
288 /* Marks names that are used in BB and outside of the loop they are | |
289 defined in for rewrite. Records the set of blocks in that the ssa | |
290 names are defined to USE_BLOCKS. Record the SSA names that will | |
291 need exit PHIs in NEED_PHIS. */ | |
292 | |
293 static void | |
294 find_uses_to_rename_bb (basic_block bb, bitmap *use_blocks, bitmap need_phis) | |
295 { | |
296 gimple_stmt_iterator bsi; | |
297 edge e; | |
298 edge_iterator ei; | |
299 | |
300 FOR_EACH_EDGE (e, ei, bb->succs) | |
301 for (bsi = gsi_start_phis (e->dest); !gsi_end_p (bsi); gsi_next (&bsi)) | |
302 find_uses_to_rename_use (bb, PHI_ARG_DEF_FROM_EDGE (gsi_stmt (bsi), e), | |
303 use_blocks, need_phis); | |
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304 |
0 | 305 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) |
306 find_uses_to_rename_stmt (gsi_stmt (bsi), use_blocks, need_phis); | |
307 } | |
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308 |
0 | 309 /* Marks names that are used outside of the loop they are defined in |
310 for rewrite. Records the set of blocks in that the ssa | |
311 names are defined to USE_BLOCKS. If CHANGED_BBS is not NULL, | |
312 scan only blocks in this set. */ | |
313 | |
314 static void | |
315 find_uses_to_rename (bitmap changed_bbs, bitmap *use_blocks, bitmap need_phis) | |
316 { | |
317 basic_block bb; | |
318 unsigned index; | |
319 bitmap_iterator bi; | |
320 | |
321 if (changed_bbs && !bitmap_empty_p (changed_bbs)) | |
322 { | |
323 EXECUTE_IF_SET_IN_BITMAP (changed_bbs, 0, index, bi) | |
324 { | |
325 find_uses_to_rename_bb (BASIC_BLOCK (index), use_blocks, need_phis); | |
326 } | |
327 } | |
328 else | |
329 { | |
330 FOR_EACH_BB (bb) | |
331 { | |
332 find_uses_to_rename_bb (bb, use_blocks, need_phis); | |
333 } | |
334 } | |
335 } | |
336 | |
337 /* Rewrites the program into a loop closed ssa form -- i.e. inserts extra | |
338 phi nodes to ensure that no variable is used outside the loop it is | |
339 defined in. | |
340 | |
341 This strengthening of the basic ssa form has several advantages: | |
342 | |
343 1) Updating it during unrolling/peeling/versioning is trivial, since | |
344 we do not need to care about the uses outside of the loop. | |
345 2) The behavior of all uses of an induction variable is the same. | |
346 Without this, you need to distinguish the case when the variable | |
347 is used outside of the loop it is defined in, for example | |
348 | |
349 for (i = 0; i < 100; i++) | |
350 { | |
351 for (j = 0; j < 100; j++) | |
352 { | |
353 k = i + j; | |
354 use1 (k); | |
355 } | |
356 use2 (k); | |
357 } | |
358 | |
359 Looking from the outer loop with the normal SSA form, the first use of k | |
360 is not well-behaved, while the second one is an induction variable with | |
361 base 99 and step 1. | |
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362 |
0 | 363 If CHANGED_BBS is not NULL, we look for uses outside loops only in |
364 the basic blocks in this set. | |
365 | |
366 UPDATE_FLAG is used in the call to update_ssa. See | |
367 TODO_update_ssa* for documentation. */ | |
368 | |
369 void | |
370 rewrite_into_loop_closed_ssa (bitmap changed_bbs, unsigned update_flag) | |
371 { | |
372 bitmap loop_exits; | |
373 bitmap *use_blocks; | |
374 unsigned i, old_num_ssa_names; | |
375 bitmap names_to_rename; | |
376 | |
377 loops_state_set (LOOP_CLOSED_SSA); | |
378 if (number_of_loops () <= 1) | |
379 return; | |
380 | |
381 loop_exits = get_loops_exits (); | |
382 names_to_rename = BITMAP_ALLOC (NULL); | |
383 | |
384 /* If the pass has caused the SSA form to be out-of-date, update it | |
385 now. */ | |
386 update_ssa (update_flag); | |
387 | |
388 old_num_ssa_names = num_ssa_names; | |
389 use_blocks = XCNEWVEC (bitmap, old_num_ssa_names); | |
390 | |
391 /* Find the uses outside loops. */ | |
392 find_uses_to_rename (changed_bbs, use_blocks, names_to_rename); | |
393 | |
394 /* Add the PHI nodes on exits of the loops for the names we need to | |
395 rewrite. */ | |
396 add_exit_phis (names_to_rename, use_blocks, loop_exits); | |
397 | |
398 for (i = 0; i < old_num_ssa_names; i++) | |
399 BITMAP_FREE (use_blocks[i]); | |
400 free (use_blocks); | |
401 BITMAP_FREE (loop_exits); | |
402 BITMAP_FREE (names_to_rename); | |
403 | |
404 /* Fix up all the names found to be used outside their original | |
405 loops. */ | |
406 update_ssa (TODO_update_ssa); | |
407 } | |
408 | |
409 /* Check invariants of the loop closed ssa form for the USE in BB. */ | |
410 | |
411 static void | |
412 check_loop_closed_ssa_use (basic_block bb, tree use) | |
413 { | |
414 gimple def; | |
415 basic_block def_bb; | |
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416 |
0 | 417 if (TREE_CODE (use) != SSA_NAME || !is_gimple_reg (use)) |
418 return; | |
419 | |
420 def = SSA_NAME_DEF_STMT (use); | |
421 def_bb = gimple_bb (def); | |
422 gcc_assert (!def_bb | |
423 || flow_bb_inside_loop_p (def_bb->loop_father, bb)); | |
424 } | |
425 | |
426 /* Checks invariants of loop closed ssa form in statement STMT in BB. */ | |
427 | |
428 static void | |
429 check_loop_closed_ssa_stmt (basic_block bb, gimple stmt) | |
430 { | |
431 ssa_op_iter iter; | |
432 tree var; | |
433 | |
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434 if (is_gimple_debug (stmt)) |
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435 return; |
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436 |
0 | 437 FOR_EACH_SSA_TREE_OPERAND (var, stmt, iter, SSA_OP_ALL_USES) |
438 check_loop_closed_ssa_use (bb, var); | |
439 } | |
440 | |
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441 /* Checks that invariants of the loop closed ssa form are preserved. |
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442 Call verify_ssa when VERIFY_SSA_P is true. */ |
0 | 443 |
444 void | |
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445 verify_loop_closed_ssa (bool verify_ssa_p) |
0 | 446 { |
447 basic_block bb; | |
448 gimple_stmt_iterator bsi; | |
449 gimple phi; | |
450 edge e; | |
451 edge_iterator ei; | |
452 | |
453 if (number_of_loops () <= 1) | |
454 return; | |
455 | |
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456 if (verify_ssa_p) |
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457 verify_ssa (false); |
0 | 458 |
459 FOR_EACH_BB (bb) | |
460 { | |
461 for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
462 { | |
463 phi = gsi_stmt (bsi); | |
464 FOR_EACH_EDGE (e, ei, bb->preds) | |
465 check_loop_closed_ssa_use (e->src, | |
466 PHI_ARG_DEF_FROM_EDGE (phi, e)); | |
467 } | |
468 | |
469 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
470 check_loop_closed_ssa_stmt (bb, gsi_stmt (bsi)); | |
471 } | |
472 } | |
473 | |
474 /* Split loop exit edge EXIT. The things are a bit complicated by a need to | |
475 preserve the loop closed ssa form. The newly created block is returned. */ | |
476 | |
477 basic_block | |
478 split_loop_exit_edge (edge exit) | |
479 { | |
480 basic_block dest = exit->dest; | |
481 basic_block bb = split_edge (exit); | |
482 gimple phi, new_phi; | |
483 tree new_name, name; | |
484 use_operand_p op_p; | |
485 gimple_stmt_iterator psi; | |
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486 source_location locus; |
0 | 487 |
488 for (psi = gsi_start_phis (dest); !gsi_end_p (psi); gsi_next (&psi)) | |
489 { | |
490 phi = gsi_stmt (psi); | |
491 op_p = PHI_ARG_DEF_PTR_FROM_EDGE (phi, single_succ_edge (bb)); | |
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492 locus = gimple_phi_arg_location_from_edge (phi, single_succ_edge (bb)); |
0 | 493 |
494 name = USE_FROM_PTR (op_p); | |
495 | |
496 /* If the argument of the PHI node is a constant, we do not need | |
497 to keep it inside loop. */ | |
498 if (TREE_CODE (name) != SSA_NAME) | |
499 continue; | |
500 | |
501 /* Otherwise create an auxiliary phi node that will copy the value | |
502 of the SSA name out of the loop. */ | |
503 new_name = duplicate_ssa_name (name, NULL); | |
504 new_phi = create_phi_node (new_name, bb); | |
505 SSA_NAME_DEF_STMT (new_name) = new_phi; | |
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506 add_phi_arg (new_phi, name, exit, locus); |
0 | 507 SET_USE (op_p, new_name); |
508 } | |
509 | |
510 return bb; | |
511 } | |
512 | |
513 /* Returns the basic block in that statements should be emitted for induction | |
514 variables incremented at the end of the LOOP. */ | |
515 | |
516 basic_block | |
517 ip_end_pos (struct loop *loop) | |
518 { | |
519 return loop->latch; | |
520 } | |
521 | |
522 /* Returns the basic block in that statements should be emitted for induction | |
523 variables incremented just before exit condition of a LOOP. */ | |
524 | |
525 basic_block | |
526 ip_normal_pos (struct loop *loop) | |
527 { | |
528 gimple last; | |
529 basic_block bb; | |
530 edge exit; | |
531 | |
532 if (!single_pred_p (loop->latch)) | |
533 return NULL; | |
534 | |
535 bb = single_pred (loop->latch); | |
536 last = last_stmt (bb); | |
537 if (!last | |
538 || gimple_code (last) != GIMPLE_COND) | |
539 return NULL; | |
540 | |
541 exit = EDGE_SUCC (bb, 0); | |
542 if (exit->dest == loop->latch) | |
543 exit = EDGE_SUCC (bb, 1); | |
544 | |
545 if (flow_bb_inside_loop_p (loop, exit->dest)) | |
546 return NULL; | |
547 | |
548 return bb; | |
549 } | |
550 | |
551 /* Stores the standard position for induction variable increment in LOOP | |
552 (just before the exit condition if it is available and latch block is empty, | |
553 end of the latch block otherwise) to BSI. INSERT_AFTER is set to true if | |
554 the increment should be inserted after *BSI. */ | |
555 | |
556 void | |
557 standard_iv_increment_position (struct loop *loop, gimple_stmt_iterator *bsi, | |
558 bool *insert_after) | |
559 { | |
560 basic_block bb = ip_normal_pos (loop), latch = ip_end_pos (loop); | |
561 gimple last = last_stmt (latch); | |
562 | |
563 if (!bb | |
564 || (last && gimple_code (last) != GIMPLE_LABEL)) | |
565 { | |
566 *bsi = gsi_last_bb (latch); | |
567 *insert_after = true; | |
568 } | |
569 else | |
570 { | |
571 *bsi = gsi_last_bb (bb); | |
572 *insert_after = false; | |
573 } | |
574 } | |
575 | |
576 /* Copies phi node arguments for duplicated blocks. The index of the first | |
577 duplicated block is FIRST_NEW_BLOCK. */ | |
578 | |
579 static void | |
580 copy_phi_node_args (unsigned first_new_block) | |
581 { | |
582 unsigned i; | |
583 | |
584 for (i = first_new_block; i < (unsigned) last_basic_block; i++) | |
585 BASIC_BLOCK (i)->flags |= BB_DUPLICATED; | |
586 | |
587 for (i = first_new_block; i < (unsigned) last_basic_block; i++) | |
588 add_phi_args_after_copy_bb (BASIC_BLOCK (i)); | |
589 | |
590 for (i = first_new_block; i < (unsigned) last_basic_block; i++) | |
591 BASIC_BLOCK (i)->flags &= ~BB_DUPLICATED; | |
592 } | |
593 | |
594 | |
595 /* The same as cfgloopmanip.c:duplicate_loop_to_header_edge, but also | |
596 updates the PHI nodes at start of the copied region. In order to | |
597 achieve this, only loops whose exits all lead to the same location | |
598 are handled. | |
599 | |
600 Notice that we do not completely update the SSA web after | |
601 duplication. The caller is responsible for calling update_ssa | |
602 after the loop has been duplicated. */ | |
603 | |
604 bool | |
605 gimple_duplicate_loop_to_header_edge (struct loop *loop, edge e, | |
606 unsigned int ndupl, sbitmap wont_exit, | |
607 edge orig, VEC (edge, heap) **to_remove, | |
608 int flags) | |
609 { | |
610 unsigned first_new_block; | |
611 | |
612 if (!loops_state_satisfies_p (LOOPS_HAVE_SIMPLE_LATCHES)) | |
613 return false; | |
614 if (!loops_state_satisfies_p (LOOPS_HAVE_PREHEADERS)) | |
615 return false; | |
616 | |
617 #ifdef ENABLE_CHECKING | |
618 if (loops_state_satisfies_p (LOOP_CLOSED_SSA)) | |
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619 verify_loop_closed_ssa (true); |
0 | 620 #endif |
621 | |
622 first_new_block = last_basic_block; | |
623 if (!duplicate_loop_to_header_edge (loop, e, ndupl, wont_exit, | |
624 orig, to_remove, flags)) | |
625 return false; | |
626 | |
627 /* Readd the removed phi args for e. */ | |
628 flush_pending_stmts (e); | |
629 | |
630 /* Copy the phi node arguments. */ | |
631 copy_phi_node_args (first_new_block); | |
632 | |
633 scev_reset (); | |
634 | |
635 return true; | |
636 } | |
637 | |
638 /* Returns true if we can unroll LOOP FACTOR times. Number | |
639 of iterations of the loop is returned in NITER. */ | |
640 | |
641 bool | |
642 can_unroll_loop_p (struct loop *loop, unsigned factor, | |
643 struct tree_niter_desc *niter) | |
644 { | |
645 edge exit; | |
646 | |
647 /* Check whether unrolling is possible. We only want to unroll loops | |
648 for that we are able to determine number of iterations. We also | |
649 want to split the extra iterations of the loop from its end, | |
650 therefore we require that the loop has precisely one | |
651 exit. */ | |
652 | |
653 exit = single_dom_exit (loop); | |
654 if (!exit) | |
655 return false; | |
656 | |
657 if (!number_of_iterations_exit (loop, exit, niter, false) | |
658 || niter->cmp == ERROR_MARK | |
659 /* Scalar evolutions analysis might have copy propagated | |
660 the abnormal ssa names into these expressions, hence | |
661 emitting the computations based on them during loop | |
662 unrolling might create overlapping life ranges for | |
663 them, and failures in out-of-ssa. */ | |
664 || contains_abnormal_ssa_name_p (niter->may_be_zero) | |
665 || contains_abnormal_ssa_name_p (niter->control.base) | |
666 || contains_abnormal_ssa_name_p (niter->control.step) | |
667 || contains_abnormal_ssa_name_p (niter->bound)) | |
668 return false; | |
669 | |
670 /* And of course, we must be able to duplicate the loop. */ | |
671 if (!can_duplicate_loop_p (loop)) | |
672 return false; | |
673 | |
674 /* The final loop should be small enough. */ | |
675 if (tree_num_loop_insns (loop, &eni_size_weights) * factor | |
676 > (unsigned) PARAM_VALUE (PARAM_MAX_UNROLLED_INSNS)) | |
677 return false; | |
678 | |
679 return true; | |
680 } | |
681 | |
682 /* Determines the conditions that control execution of LOOP unrolled FACTOR | |
683 times. DESC is number of iterations of LOOP. ENTER_COND is set to | |
684 condition that must be true if the main loop can be entered. | |
685 EXIT_BASE, EXIT_STEP, EXIT_CMP and EXIT_BOUND are set to values describing | |
686 how the exit from the unrolled loop should be controlled. */ | |
687 | |
688 static void | |
689 determine_exit_conditions (struct loop *loop, struct tree_niter_desc *desc, | |
690 unsigned factor, tree *enter_cond, | |
691 tree *exit_base, tree *exit_step, | |
692 enum tree_code *exit_cmp, tree *exit_bound) | |
693 { | |
694 gimple_seq stmts; | |
695 tree base = desc->control.base; | |
696 tree step = desc->control.step; | |
697 tree bound = desc->bound; | |
698 tree type = TREE_TYPE (step); | |
699 tree bigstep, delta; | |
700 tree min = lower_bound_in_type (type, type); | |
701 tree max = upper_bound_in_type (type, type); | |
702 enum tree_code cmp = desc->cmp; | |
703 tree cond = boolean_true_node, assum; | |
704 | |
705 /* For pointers, do the arithmetics in the type of step (sizetype). */ | |
706 base = fold_convert (type, base); | |
707 bound = fold_convert (type, bound); | |
708 | |
709 *enter_cond = boolean_false_node; | |
710 *exit_base = NULL_TREE; | |
711 *exit_step = NULL_TREE; | |
712 *exit_cmp = ERROR_MARK; | |
713 *exit_bound = NULL_TREE; | |
714 gcc_assert (cmp != ERROR_MARK); | |
715 | |
716 /* We only need to be correct when we answer question | |
717 "Do at least FACTOR more iterations remain?" in the unrolled loop. | |
718 Thus, transforming BASE + STEP * i <> BOUND to | |
719 BASE + STEP * i < BOUND is ok. */ | |
720 if (cmp == NE_EXPR) | |
721 { | |
722 if (tree_int_cst_sign_bit (step)) | |
723 cmp = GT_EXPR; | |
724 else | |
725 cmp = LT_EXPR; | |
726 } | |
727 else if (cmp == LT_EXPR) | |
728 { | |
729 gcc_assert (!tree_int_cst_sign_bit (step)); | |
730 } | |
731 else if (cmp == GT_EXPR) | |
732 { | |
733 gcc_assert (tree_int_cst_sign_bit (step)); | |
734 } | |
735 else | |
736 gcc_unreachable (); | |
737 | |
738 /* The main body of the loop may be entered iff: | |
739 | |
740 1) desc->may_be_zero is false. | |
741 2) it is possible to check that there are at least FACTOR iterations | |
742 of the loop, i.e., BOUND - step * FACTOR does not overflow. | |
743 3) # of iterations is at least FACTOR */ | |
744 | |
745 if (!integer_zerop (desc->may_be_zero)) | |
746 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, | |
747 invert_truthvalue (desc->may_be_zero), | |
748 cond); | |
749 | |
750 bigstep = fold_build2 (MULT_EXPR, type, step, | |
751 build_int_cst_type (type, factor)); | |
752 delta = fold_build2 (MINUS_EXPR, type, bigstep, step); | |
753 if (cmp == LT_EXPR) | |
754 assum = fold_build2 (GE_EXPR, boolean_type_node, | |
755 bound, | |
756 fold_build2 (PLUS_EXPR, type, min, delta)); | |
757 else | |
758 assum = fold_build2 (LE_EXPR, boolean_type_node, | |
759 bound, | |
760 fold_build2 (PLUS_EXPR, type, max, delta)); | |
761 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, assum, cond); | |
762 | |
763 bound = fold_build2 (MINUS_EXPR, type, bound, delta); | |
764 assum = fold_build2 (cmp, boolean_type_node, base, bound); | |
765 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, assum, cond); | |
766 | |
767 cond = force_gimple_operand (unshare_expr (cond), &stmts, false, NULL_TREE); | |
768 if (stmts) | |
769 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
770 /* cond now may be a gimple comparison, which would be OK, but also any | |
771 other gimple rhs (say a && b). In this case we need to force it to | |
772 operand. */ | |
773 if (!is_gimple_condexpr (cond)) | |
774 { | |
775 cond = force_gimple_operand (cond, &stmts, true, NULL_TREE); | |
776 if (stmts) | |
777 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
778 } | |
779 *enter_cond = cond; | |
780 | |
781 base = force_gimple_operand (unshare_expr (base), &stmts, true, NULL_TREE); | |
782 if (stmts) | |
783 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
784 bound = force_gimple_operand (unshare_expr (bound), &stmts, true, NULL_TREE); | |
785 if (stmts) | |
786 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
787 | |
788 *exit_base = base; | |
789 *exit_step = bigstep; | |
790 *exit_cmp = cmp; | |
791 *exit_bound = bound; | |
792 } | |
793 | |
794 /* Scales the frequencies of all basic blocks in LOOP that are strictly | |
795 dominated by BB by NUM/DEN. */ | |
796 | |
797 static void | |
798 scale_dominated_blocks_in_loop (struct loop *loop, basic_block bb, | |
799 int num, int den) | |
800 { | |
801 basic_block son; | |
802 | |
803 if (den == 0) | |
804 return; | |
805 | |
806 for (son = first_dom_son (CDI_DOMINATORS, bb); | |
807 son; | |
808 son = next_dom_son (CDI_DOMINATORS, son)) | |
809 { | |
810 if (!flow_bb_inside_loop_p (loop, son)) | |
811 continue; | |
812 scale_bbs_frequencies_int (&son, 1, num, den); | |
813 scale_dominated_blocks_in_loop (loop, son, num, den); | |
814 } | |
815 } | |
816 | |
817 /* Unroll LOOP FACTOR times. DESC describes number of iterations of LOOP. | |
818 EXIT is the exit of the loop to that DESC corresponds. | |
819 | |
820 If N is number of iterations of the loop and MAY_BE_ZERO is the condition | |
821 under that loop exits in the first iteration even if N != 0, | |
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822 |
0 | 823 while (1) |
824 { | |
825 x = phi (init, next); | |
826 | |
827 pre; | |
828 if (st) | |
829 break; | |
830 post; | |
831 } | |
832 | |
833 becomes (with possibly the exit conditions formulated a bit differently, | |
834 avoiding the need to create a new iv): | |
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835 |
0 | 836 if (MAY_BE_ZERO || N < FACTOR) |
837 goto rest; | |
838 | |
839 do | |
840 { | |
841 x = phi (init, next); | |
842 | |
843 pre; | |
844 post; | |
845 pre; | |
846 post; | |
847 ... | |
848 pre; | |
849 post; | |
850 N -= FACTOR; | |
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851 |
0 | 852 } while (N >= FACTOR); |
853 | |
854 rest: | |
855 init' = phi (init, x); | |
856 | |
857 while (1) | |
858 { | |
859 x = phi (init', next); | |
860 | |
861 pre; | |
862 if (st) | |
863 break; | |
864 post; | |
865 } | |
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866 |
0 | 867 Before the loop is unrolled, TRANSFORM is called for it (only for the |
868 unrolled loop, but not for its versioned copy). DATA is passed to | |
869 TRANSFORM. */ | |
870 | |
871 /* Probability in % that the unrolled loop is entered. Just a guess. */ | |
872 #define PROB_UNROLLED_LOOP_ENTERED 90 | |
873 | |
874 void | |
875 tree_transform_and_unroll_loop (struct loop *loop, unsigned factor, | |
876 edge exit, struct tree_niter_desc *desc, | |
877 transform_callback transform, | |
878 void *data) | |
879 { | |
880 gimple exit_if; | |
881 tree ctr_before, ctr_after; | |
882 tree enter_main_cond, exit_base, exit_step, exit_bound; | |
883 enum tree_code exit_cmp; | |
884 gimple phi_old_loop, phi_new_loop, phi_rest; | |
885 gimple_stmt_iterator psi_old_loop, psi_new_loop; | |
886 tree init, next, new_init, var; | |
887 struct loop *new_loop; | |
888 basic_block rest, exit_bb; | |
889 edge old_entry, new_entry, old_latch, precond_edge, new_exit; | |
890 edge new_nonexit, e; | |
891 gimple_stmt_iterator bsi; | |
892 use_operand_p op; | |
893 bool ok; | |
894 unsigned est_niter, prob_entry, scale_unrolled, scale_rest, freq_e, freq_h; | |
895 unsigned new_est_niter, i, prob; | |
896 unsigned irr = loop_preheader_edge (loop)->flags & EDGE_IRREDUCIBLE_LOOP; | |
897 sbitmap wont_exit; | |
898 VEC (edge, heap) *to_remove = NULL; | |
899 | |
900 est_niter = expected_loop_iterations (loop); | |
901 determine_exit_conditions (loop, desc, factor, | |
902 &enter_main_cond, &exit_base, &exit_step, | |
903 &exit_cmp, &exit_bound); | |
904 | |
905 /* Let us assume that the unrolled loop is quite likely to be entered. */ | |
906 if (integer_nonzerop (enter_main_cond)) | |
907 prob_entry = REG_BR_PROB_BASE; | |
908 else | |
909 prob_entry = PROB_UNROLLED_LOOP_ENTERED * REG_BR_PROB_BASE / 100; | |
910 | |
911 /* The values for scales should keep profile consistent, and somewhat close | |
912 to correct. | |
913 | |
914 TODO: The current value of SCALE_REST makes it appear that the loop that | |
915 is created by splitting the remaining iterations of the unrolled loop is | |
916 executed the same number of times as the original loop, and with the same | |
917 frequencies, which is obviously wrong. This does not appear to cause | |
918 problems, so we do not bother with fixing it for now. To make the profile | |
919 correct, we would need to change the probability of the exit edge of the | |
920 loop, and recompute the distribution of frequencies in its body because | |
921 of this change (scale the frequencies of blocks before and after the exit | |
922 by appropriate factors). */ | |
923 scale_unrolled = prob_entry; | |
924 scale_rest = REG_BR_PROB_BASE; | |
925 | |
926 new_loop = loop_version (loop, enter_main_cond, NULL, | |
927 prob_entry, scale_unrolled, scale_rest, true); | |
928 gcc_assert (new_loop != NULL); | |
929 update_ssa (TODO_update_ssa); | |
930 | |
931 /* Determine the probability of the exit edge of the unrolled loop. */ | |
932 new_est_niter = est_niter / factor; | |
933 | |
934 /* Without profile feedback, loops for that we do not know a better estimate | |
935 are assumed to roll 10 times. When we unroll such loop, it appears to | |
936 roll too little, and it may even seem to be cold. To avoid this, we | |
937 ensure that the created loop appears to roll at least 5 times (but at | |
938 most as many times as before unrolling). */ | |
939 if (new_est_niter < 5) | |
940 { | |
941 if (est_niter < 5) | |
942 new_est_niter = est_niter; | |
943 else | |
944 new_est_niter = 5; | |
945 } | |
946 | |
947 /* Prepare the cfg and update the phi nodes. Move the loop exit to the | |
948 loop latch (and make its condition dummy, for the moment). */ | |
949 rest = loop_preheader_edge (new_loop)->src; | |
950 precond_edge = single_pred_edge (rest); | |
951 split_edge (loop_latch_edge (loop)); | |
952 exit_bb = single_pred (loop->latch); | |
953 | |
954 /* Since the exit edge will be removed, the frequency of all the blocks | |
955 in the loop that are dominated by it must be scaled by | |
956 1 / (1 - exit->probability). */ | |
957 scale_dominated_blocks_in_loop (loop, exit->src, | |
958 REG_BR_PROB_BASE, | |
959 REG_BR_PROB_BASE - exit->probability); | |
960 | |
961 bsi = gsi_last_bb (exit_bb); | |
962 exit_if = gimple_build_cond (EQ_EXPR, integer_zero_node, | |
963 integer_zero_node, | |
964 NULL_TREE, NULL_TREE); | |
965 | |
966 gsi_insert_after (&bsi, exit_if, GSI_NEW_STMT); | |
967 new_exit = make_edge (exit_bb, rest, EDGE_FALSE_VALUE | irr); | |
968 rescan_loop_exit (new_exit, true, false); | |
969 | |
970 /* Set the probability of new exit to the same of the old one. Fix | |
971 the frequency of the latch block, by scaling it back by | |
972 1 - exit->probability. */ | |
973 new_exit->count = exit->count; | |
974 new_exit->probability = exit->probability; | |
975 new_nonexit = single_pred_edge (loop->latch); | |
976 new_nonexit->probability = REG_BR_PROB_BASE - exit->probability; | |
977 new_nonexit->flags = EDGE_TRUE_VALUE; | |
978 new_nonexit->count -= exit->count; | |
979 if (new_nonexit->count < 0) | |
980 new_nonexit->count = 0; | |
981 scale_bbs_frequencies_int (&loop->latch, 1, new_nonexit->probability, | |
982 REG_BR_PROB_BASE); | |
983 | |
984 old_entry = loop_preheader_edge (loop); | |
985 new_entry = loop_preheader_edge (new_loop); | |
986 old_latch = loop_latch_edge (loop); | |
987 for (psi_old_loop = gsi_start_phis (loop->header), | |
988 psi_new_loop = gsi_start_phis (new_loop->header); | |
989 !gsi_end_p (psi_old_loop); | |
990 gsi_next (&psi_old_loop), gsi_next (&psi_new_loop)) | |
991 { | |
992 phi_old_loop = gsi_stmt (psi_old_loop); | |
993 phi_new_loop = gsi_stmt (psi_new_loop); | |
994 | |
995 init = PHI_ARG_DEF_FROM_EDGE (phi_old_loop, old_entry); | |
996 op = PHI_ARG_DEF_PTR_FROM_EDGE (phi_new_loop, new_entry); | |
997 gcc_assert (operand_equal_for_phi_arg_p (init, USE_FROM_PTR (op))); | |
998 next = PHI_ARG_DEF_FROM_EDGE (phi_old_loop, old_latch); | |
999 | |
1000 /* Prefer using original variable as a base for the new ssa name. | |
1001 This is necessary for virtual ops, and useful in order to avoid | |
1002 losing debug info for real ops. */ | |
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1003 if (TREE_CODE (next) == SSA_NAME |
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1004 && useless_type_conversion_p (TREE_TYPE (next), |
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1005 TREE_TYPE (init))) |
0 | 1006 var = SSA_NAME_VAR (next); |
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1007 else if (TREE_CODE (init) == SSA_NAME |
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1008 && useless_type_conversion_p (TREE_TYPE (init), |
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1009 TREE_TYPE (next))) |
0 | 1010 var = SSA_NAME_VAR (init); |
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1011 else if (useless_type_conversion_p (TREE_TYPE (next), TREE_TYPE (init))) |
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1012 { |
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1013 var = create_tmp_var (TREE_TYPE (next), "unrinittmp"); |
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1014 add_referenced_var (var); |
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1015 } |
0 | 1016 else |
1017 { | |
1018 var = create_tmp_var (TREE_TYPE (init), "unrinittmp"); | |
1019 add_referenced_var (var); | |
1020 } | |
1021 | |
1022 new_init = make_ssa_name (var, NULL); | |
1023 phi_rest = create_phi_node (new_init, rest); | |
1024 SSA_NAME_DEF_STMT (new_init) = phi_rest; | |
1025 | |
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1026 add_phi_arg (phi_rest, init, precond_edge, UNKNOWN_LOCATION); |
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1027 add_phi_arg (phi_rest, next, new_exit, UNKNOWN_LOCATION); |
0 | 1028 SET_USE (op, new_init); |
1029 } | |
1030 | |
1031 remove_path (exit); | |
1032 | |
1033 /* Transform the loop. */ | |
1034 if (transform) | |
1035 (*transform) (loop, data); | |
1036 | |
1037 /* Unroll the loop and remove the exits in all iterations except for the | |
1038 last one. */ | |
1039 wont_exit = sbitmap_alloc (factor); | |
1040 sbitmap_ones (wont_exit); | |
1041 RESET_BIT (wont_exit, factor - 1); | |
1042 | |
1043 ok = gimple_duplicate_loop_to_header_edge | |
1044 (loop, loop_latch_edge (loop), factor - 1, | |
1045 wont_exit, new_exit, &to_remove, DLTHE_FLAG_UPDATE_FREQ); | |
1046 free (wont_exit); | |
1047 gcc_assert (ok); | |
1048 | |
1049 for (i = 0; VEC_iterate (edge, to_remove, i, e); i++) | |
1050 { | |
1051 ok = remove_path (e); | |
1052 gcc_assert (ok); | |
1053 } | |
1054 VEC_free (edge, heap, to_remove); | |
1055 update_ssa (TODO_update_ssa); | |
1056 | |
1057 /* Ensure that the frequencies in the loop match the new estimated | |
1058 number of iterations, and change the probability of the new | |
1059 exit edge. */ | |
1060 freq_h = loop->header->frequency; | |
1061 freq_e = EDGE_FREQUENCY (loop_preheader_edge (loop)); | |
1062 if (freq_h != 0) | |
1063 scale_loop_frequencies (loop, freq_e * (new_est_niter + 1), freq_h); | |
1064 | |
1065 exit_bb = single_pred (loop->latch); | |
1066 new_exit = find_edge (exit_bb, rest); | |
1067 new_exit->count = loop_preheader_edge (loop)->count; | |
1068 new_exit->probability = REG_BR_PROB_BASE / (new_est_niter + 1); | |
1069 | |
1070 rest->count += new_exit->count; | |
1071 rest->frequency += EDGE_FREQUENCY (new_exit); | |
1072 | |
1073 new_nonexit = single_pred_edge (loop->latch); | |
1074 prob = new_nonexit->probability; | |
1075 new_nonexit->probability = REG_BR_PROB_BASE - new_exit->probability; | |
1076 new_nonexit->count = exit_bb->count - new_exit->count; | |
1077 if (new_nonexit->count < 0) | |
1078 new_nonexit->count = 0; | |
1079 if (prob > 0) | |
1080 scale_bbs_frequencies_int (&loop->latch, 1, new_nonexit->probability, | |
1081 prob); | |
1082 | |
1083 /* Finally create the new counter for number of iterations and add the new | |
1084 exit instruction. */ | |
1085 bsi = gsi_last_bb (exit_bb); | |
1086 exit_if = gsi_stmt (bsi); | |
1087 create_iv (exit_base, exit_step, NULL_TREE, loop, | |
1088 &bsi, false, &ctr_before, &ctr_after); | |
1089 gimple_cond_set_code (exit_if, exit_cmp); | |
1090 gimple_cond_set_lhs (exit_if, ctr_after); | |
1091 gimple_cond_set_rhs (exit_if, exit_bound); | |
1092 update_stmt (exit_if); | |
1093 | |
1094 #ifdef ENABLE_CHECKING | |
1095 verify_flow_info (); | |
1096 verify_dominators (CDI_DOMINATORS); | |
1097 verify_loop_structure (); | |
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1098 verify_loop_closed_ssa (true); |
0 | 1099 #endif |
1100 } | |
1101 | |
1102 /* Wrapper over tree_transform_and_unroll_loop for case we do not | |
1103 want to transform the loop before unrolling. The meaning | |
1104 of the arguments is the same as for tree_transform_and_unroll_loop. */ | |
1105 | |
1106 void | |
1107 tree_unroll_loop (struct loop *loop, unsigned factor, | |
1108 edge exit, struct tree_niter_desc *desc) | |
1109 { | |
1110 tree_transform_and_unroll_loop (loop, factor, exit, desc, | |
1111 NULL, NULL); | |
1112 } | |
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1113 |
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1114 /* Rewrite the phi node at position PSI in function of the main |
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1115 induction variable MAIN_IV and insert the generated code at GSI. */ |
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1116 |
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1117 static void |
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1118 rewrite_phi_with_iv (loop_p loop, |
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1119 gimple_stmt_iterator *psi, |
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1120 gimple_stmt_iterator *gsi, |
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1121 tree main_iv) |
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1122 { |
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1123 affine_iv iv; |
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1124 gimple stmt, phi = gsi_stmt (*psi); |
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1125 tree atype, mtype, val, res = PHI_RESULT (phi); |
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1126 |
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1127 if (!is_gimple_reg (res) || res == main_iv) |
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1128 { |
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1129 gsi_next (psi); |
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1130 return; |
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1131 } |
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1132 |
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1133 if (!simple_iv (loop, loop, res, &iv, true)) |
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1134 { |
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1135 gsi_next (psi); |
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1136 return; |
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1137 } |
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1138 |
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1139 remove_phi_node (psi, false); |
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1140 |
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1141 atype = TREE_TYPE (res); |
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1142 mtype = POINTER_TYPE_P (atype) ? sizetype : atype; |
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1143 val = fold_build2 (MULT_EXPR, mtype, unshare_expr (iv.step), |
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1144 fold_convert (mtype, main_iv)); |
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1145 val = fold_build2 (POINTER_TYPE_P (atype) |
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1146 ? POINTER_PLUS_EXPR : PLUS_EXPR, |
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1147 atype, unshare_expr (iv.base), val); |
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1148 val = force_gimple_operand_gsi (gsi, val, false, NULL_TREE, true, |
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1149 GSI_SAME_STMT); |
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1150 stmt = gimple_build_assign (res, val); |
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1151 gsi_insert_before (gsi, stmt, GSI_SAME_STMT); |
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1152 SSA_NAME_DEF_STMT (res) = stmt; |
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1153 } |
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1154 |
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1155 /* Rewrite all the phi nodes of LOOP in function of the main induction |
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1156 variable MAIN_IV. */ |
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1157 |
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1158 static void |
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1159 rewrite_all_phi_nodes_with_iv (loop_p loop, tree main_iv) |
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1160 { |
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1161 unsigned i; |
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1162 basic_block *bbs = get_loop_body_in_dom_order (loop); |
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1163 gimple_stmt_iterator psi; |
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1164 |
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1165 for (i = 0; i < loop->num_nodes; i++) |
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1166 { |
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1167 basic_block bb = bbs[i]; |
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1168 gimple_stmt_iterator gsi = gsi_after_labels (bb); |
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1169 |
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1170 if (bb->loop_father != loop) |
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1171 continue; |
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1172 |
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1173 for (psi = gsi_start_phis (bb); !gsi_end_p (psi); ) |
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1174 rewrite_phi_with_iv (loop, &psi, &gsi, main_iv); |
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1175 } |
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1176 |
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1177 free (bbs); |
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1178 } |
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1179 |
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1180 /* Bases all the induction variables in LOOP on a single induction |
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1181 variable (unsigned with base 0 and step 1), whose final value is |
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1182 compared with *NIT. When the IV type precision has to be larger |
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1183 than *NIT type precision, *NIT is converted to the larger type, the |
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1184 conversion code is inserted before the loop, and *NIT is updated to |
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1185 the new definition. When BUMP_IN_LATCH is true, the induction |
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1186 variable is incremented in the loop latch, otherwise it is |
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1187 incremented in the loop header. Return the induction variable that |
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1188 was created. */ |
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1189 |
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1190 tree |
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1191 canonicalize_loop_ivs (struct loop *loop, tree *nit, bool bump_in_latch) |
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1192 { |
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1193 unsigned precision = TYPE_PRECISION (TREE_TYPE (*nit)); |
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1194 unsigned original_precision = precision; |
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1195 tree type, var_before; |
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1196 gimple_stmt_iterator gsi, psi; |
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1197 gimple stmt; |
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1198 edge exit = single_dom_exit (loop); |
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1199 gimple_seq stmts; |
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1200 |
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1201 for (psi = gsi_start_phis (loop->header); |
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1202 !gsi_end_p (psi); gsi_next (&psi)) |
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1203 { |
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1204 gimple phi = gsi_stmt (psi); |
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1205 tree res = PHI_RESULT (phi); |
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1206 |
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1207 if (is_gimple_reg (res) && TYPE_PRECISION (TREE_TYPE (res)) > precision) |
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1208 precision = TYPE_PRECISION (TREE_TYPE (res)); |
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1209 } |
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1210 |
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1211 type = lang_hooks.types.type_for_size (precision, 1); |
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1212 |
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1213 if (original_precision != precision) |
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1214 { |
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1215 *nit = fold_convert (type, *nit); |
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1216 *nit = force_gimple_operand (*nit, &stmts, true, NULL_TREE); |
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1217 if (stmts) |
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1218 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); |
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1219 } |
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1220 |
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1221 gsi = gsi_last_bb (bump_in_latch ? loop->latch : loop->header); |
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1222 create_iv (build_int_cst_type (type, 0), build_int_cst (type, 1), NULL_TREE, |
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1223 loop, &gsi, bump_in_latch, &var_before, NULL); |
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1224 |
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1225 rewrite_all_phi_nodes_with_iv (loop, var_before); |
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1226 |
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1227 stmt = last_stmt (exit->src); |
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1228 /* Make the loop exit if the control condition is not satisfied. */ |
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1229 if (exit->flags & EDGE_TRUE_VALUE) |
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1230 { |
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1231 edge te, fe; |
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1232 |
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1233 extract_true_false_edges_from_block (exit->src, &te, &fe); |
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1234 te->flags = EDGE_FALSE_VALUE; |
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1235 fe->flags = EDGE_TRUE_VALUE; |
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1236 } |
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1237 gimple_cond_set_code (stmt, LT_EXPR); |
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1238 gimple_cond_set_lhs (stmt, var_before); |
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1239 gimple_cond_set_rhs (stmt, *nit); |
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1240 update_stmt (stmt); |
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1241 |
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1242 return var_before; |
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1243 } |