Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-loop-manip.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
---|---|
date | Fri, 12 Feb 2010 23:39:51 +0900 |
parents | a06113de4d67 |
children | b7f97abdc517 |
rev | line source |
---|---|
0 | 1 /* High-level loop manipulation functions. |
2 Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
3 |
0 | 4 This file is part of GCC. |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
5 |
0 | 6 GCC is free software; you can redistribute it and/or modify it |
7 under the terms of the GNU General Public License as published by the | |
8 Free Software Foundation; either version 3, or (at your option) any | |
9 later version. | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
10 |
0 | 11 GCC is distributed in the hope that it will be useful, but WITHOUT |
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 for more details. | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
15 |
0 | 16 You should have received a copy of the GNU General Public License |
17 along with GCC; see the file COPYING3. If not see | |
18 <http://www.gnu.org/licenses/>. */ | |
19 | |
20 #include "config.h" | |
21 #include "system.h" | |
22 #include "coretypes.h" | |
23 #include "tm.h" | |
24 #include "tree.h" | |
25 #include "rtl.h" | |
26 #include "tm_p.h" | |
27 #include "hard-reg-set.h" | |
28 #include "basic-block.h" | |
29 #include "output.h" | |
30 #include "diagnostic.h" | |
31 #include "tree-flow.h" | |
32 #include "tree-dump.h" | |
33 #include "timevar.h" | |
34 #include "cfgloop.h" | |
35 #include "tree-pass.h" | |
36 #include "cfglayout.h" | |
37 #include "tree-scalar-evolution.h" | |
38 #include "params.h" | |
39 #include "tree-inline.h" | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
40 #include "langhooks.h" |
0 | 41 |
42 /* Creates an induction variable with value BASE + STEP * iteration in LOOP. | |
43 It is expected that neither BASE nor STEP are shared with other expressions | |
44 (unless the sharing rules allow this). Use VAR as a base var_decl for it | |
45 (if NULL, a new temporary will be created). The increment will occur at | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
46 INCR_POS (after it if AFTER is true, before it otherwise). INCR_POS and |
0 | 47 AFTER can be computed using standard_iv_increment_position. The ssa versions |
48 of the variable before and after increment will be stored in VAR_BEFORE and | |
49 VAR_AFTER (unless they are NULL). */ | |
50 | |
51 void | |
52 create_iv (tree base, tree step, tree var, struct loop *loop, | |
53 gimple_stmt_iterator *incr_pos, bool after, | |
54 tree *var_before, tree *var_after) | |
55 { | |
56 gimple stmt; | |
57 tree initial, step1; | |
58 gimple_seq stmts; | |
59 tree vb, va; | |
60 enum tree_code incr_op = PLUS_EXPR; | |
61 edge pe = loop_preheader_edge (loop); | |
62 | |
63 if (!var) | |
64 { | |
65 var = create_tmp_var (TREE_TYPE (base), "ivtmp"); | |
66 add_referenced_var (var); | |
67 } | |
68 | |
69 vb = make_ssa_name (var, NULL); | |
70 if (var_before) | |
71 *var_before = vb; | |
72 va = make_ssa_name (var, NULL); | |
73 if (var_after) | |
74 *var_after = va; | |
75 | |
76 /* For easier readability of the created code, produce MINUS_EXPRs | |
77 when suitable. */ | |
78 if (TREE_CODE (step) == INTEGER_CST) | |
79 { | |
80 if (TYPE_UNSIGNED (TREE_TYPE (step))) | |
81 { | |
82 step1 = fold_build1 (NEGATE_EXPR, TREE_TYPE (step), step); | |
83 if (tree_int_cst_lt (step1, step)) | |
84 { | |
85 incr_op = MINUS_EXPR; | |
86 step = step1; | |
87 } | |
88 } | |
89 else | |
90 { | |
91 bool ovf; | |
92 | |
93 if (!tree_expr_nonnegative_warnv_p (step, &ovf) | |
94 && may_negate_without_overflow_p (step)) | |
95 { | |
96 incr_op = MINUS_EXPR; | |
97 step = fold_build1 (NEGATE_EXPR, TREE_TYPE (step), step); | |
98 } | |
99 } | |
100 } | |
101 if (POINTER_TYPE_P (TREE_TYPE (base))) | |
102 { | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
103 if (TREE_CODE (base) == ADDR_EXPR) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
104 mark_addressable (TREE_OPERAND (base, 0)); |
0 | 105 step = fold_convert (sizetype, step); |
106 if (incr_op == MINUS_EXPR) | |
107 step = fold_build1 (NEGATE_EXPR, sizetype, step); | |
108 incr_op = POINTER_PLUS_EXPR; | |
109 } | |
110 /* Gimplify the step if necessary. We put the computations in front of the | |
111 loop (i.e. the step should be loop invariant). */ | |
112 step = force_gimple_operand (step, &stmts, true, NULL_TREE); | |
113 if (stmts) | |
114 gsi_insert_seq_on_edge_immediate (pe, stmts); | |
115 | |
116 stmt = gimple_build_assign_with_ops (incr_op, va, vb, step); | |
117 if (after) | |
118 gsi_insert_after (incr_pos, stmt, GSI_NEW_STMT); | |
119 else | |
120 gsi_insert_before (incr_pos, stmt, GSI_NEW_STMT); | |
121 | |
122 initial = force_gimple_operand (base, &stmts, true, var); | |
123 if (stmts) | |
124 gsi_insert_seq_on_edge_immediate (pe, stmts); | |
125 | |
126 stmt = create_phi_node (vb, loop->header); | |
127 SSA_NAME_DEF_STMT (vb) = stmt; | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
128 add_phi_arg (stmt, initial, loop_preheader_edge (loop), UNKNOWN_LOCATION); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
129 add_phi_arg (stmt, va, loop_latch_edge (loop), UNKNOWN_LOCATION); |
0 | 130 } |
131 | |
132 /* Add exit phis for the USE on EXIT. */ | |
133 | |
134 static void | |
135 add_exit_phis_edge (basic_block exit, tree use) | |
136 { | |
137 gimple phi, def_stmt = SSA_NAME_DEF_STMT (use); | |
138 basic_block def_bb = gimple_bb (def_stmt); | |
139 struct loop *def_loop; | |
140 edge e; | |
141 edge_iterator ei; | |
142 | |
143 /* Check that some of the edges entering the EXIT block exits a loop in | |
144 that USE is defined. */ | |
145 FOR_EACH_EDGE (e, ei, exit->preds) | |
146 { | |
147 def_loop = find_common_loop (def_bb->loop_father, e->src->loop_father); | |
148 if (!flow_bb_inside_loop_p (def_loop, e->dest)) | |
149 break; | |
150 } | |
151 | |
152 if (!e) | |
153 return; | |
154 | |
155 phi = create_phi_node (use, exit); | |
156 create_new_def_for (gimple_phi_result (phi), phi, | |
157 gimple_phi_result_ptr (phi)); | |
158 FOR_EACH_EDGE (e, ei, exit->preds) | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
159 add_phi_arg (phi, use, e, UNKNOWN_LOCATION); |
0 | 160 } |
161 | |
162 /* Add exit phis for VAR that is used in LIVEIN. | |
163 Exits of the loops are stored in EXITS. */ | |
164 | |
165 static void | |
166 add_exit_phis_var (tree var, bitmap livein, bitmap exits) | |
167 { | |
168 bitmap def; | |
169 unsigned index; | |
170 basic_block def_bb = gimple_bb (SSA_NAME_DEF_STMT (var)); | |
171 bitmap_iterator bi; | |
172 | |
173 if (is_gimple_reg (var)) | |
174 bitmap_clear_bit (livein, def_bb->index); | |
175 else | |
176 bitmap_set_bit (livein, def_bb->index); | |
177 | |
178 def = BITMAP_ALLOC (NULL); | |
179 bitmap_set_bit (def, def_bb->index); | |
180 compute_global_livein (livein, def); | |
181 BITMAP_FREE (def); | |
182 | |
183 EXECUTE_IF_AND_IN_BITMAP (exits, livein, 0, index, bi) | |
184 { | |
185 add_exit_phis_edge (BASIC_BLOCK (index), var); | |
186 } | |
187 } | |
188 | |
189 /* Add exit phis for the names marked in NAMES_TO_RENAME. | |
190 Exits of the loops are stored in EXITS. Sets of blocks where the ssa | |
191 names are used are stored in USE_BLOCKS. */ | |
192 | |
193 static void | |
194 add_exit_phis (bitmap names_to_rename, bitmap *use_blocks, bitmap loop_exits) | |
195 { | |
196 unsigned i; | |
197 bitmap_iterator bi; | |
198 | |
199 EXECUTE_IF_SET_IN_BITMAP (names_to_rename, 0, i, bi) | |
200 { | |
201 add_exit_phis_var (ssa_name (i), use_blocks[i], loop_exits); | |
202 } | |
203 } | |
204 | |
205 /* Returns a bitmap of all loop exit edge targets. */ | |
206 | |
207 static bitmap | |
208 get_loops_exits (void) | |
209 { | |
210 bitmap exits = BITMAP_ALLOC (NULL); | |
211 basic_block bb; | |
212 edge e; | |
213 edge_iterator ei; | |
214 | |
215 FOR_EACH_BB (bb) | |
216 { | |
217 FOR_EACH_EDGE (e, ei, bb->preds) | |
218 if (e->src != ENTRY_BLOCK_PTR | |
219 && !flow_bb_inside_loop_p (e->src->loop_father, bb)) | |
220 { | |
221 bitmap_set_bit (exits, bb->index); | |
222 break; | |
223 } | |
224 } | |
225 | |
226 return exits; | |
227 } | |
228 | |
229 /* For USE in BB, if it is used outside of the loop it is defined in, | |
230 mark it for rewrite. Record basic block BB where it is used | |
231 to USE_BLOCKS. Record the ssa name index to NEED_PHIS bitmap. */ | |
232 | |
233 static void | |
234 find_uses_to_rename_use (basic_block bb, tree use, bitmap *use_blocks, | |
235 bitmap need_phis) | |
236 { | |
237 unsigned ver; | |
238 basic_block def_bb; | |
239 struct loop *def_loop; | |
240 | |
241 if (TREE_CODE (use) != SSA_NAME) | |
242 return; | |
243 | |
244 /* We don't need to keep virtual operands in loop-closed form. */ | |
245 if (!is_gimple_reg (use)) | |
246 return; | |
247 | |
248 ver = SSA_NAME_VERSION (use); | |
249 def_bb = gimple_bb (SSA_NAME_DEF_STMT (use)); | |
250 if (!def_bb) | |
251 return; | |
252 def_loop = def_bb->loop_father; | |
253 | |
254 /* If the definition is not inside a loop, it is not interesting. */ | |
255 if (!loop_outer (def_loop)) | |
256 return; | |
257 | |
258 /* If the use is not outside of the loop it is defined in, it is not | |
259 interesting. */ | |
260 if (flow_bb_inside_loop_p (def_loop, bb)) | |
261 return; | |
262 | |
263 if (!use_blocks[ver]) | |
264 use_blocks[ver] = BITMAP_ALLOC (NULL); | |
265 bitmap_set_bit (use_blocks[ver], bb->index); | |
266 | |
267 bitmap_set_bit (need_phis, ver); | |
268 } | |
269 | |
270 /* For uses in STMT, mark names that are used outside of the loop they are | |
271 defined to rewrite. Record the set of blocks in that the ssa | |
272 names are defined to USE_BLOCKS and the ssa names themselves to | |
273 NEED_PHIS. */ | |
274 | |
275 static void | |
276 find_uses_to_rename_stmt (gimple stmt, bitmap *use_blocks, bitmap need_phis) | |
277 { | |
278 ssa_op_iter iter; | |
279 tree var; | |
280 basic_block bb = gimple_bb (stmt); | |
281 | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
282 if (is_gimple_debug (stmt)) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
283 return; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
284 |
0 | 285 FOR_EACH_SSA_TREE_OPERAND (var, stmt, iter, SSA_OP_ALL_USES) |
286 find_uses_to_rename_use (bb, var, use_blocks, need_phis); | |
287 } | |
288 | |
289 /* Marks names that are used in BB and outside of the loop they are | |
290 defined in for rewrite. Records the set of blocks in that the ssa | |
291 names are defined to USE_BLOCKS. Record the SSA names that will | |
292 need exit PHIs in NEED_PHIS. */ | |
293 | |
294 static void | |
295 find_uses_to_rename_bb (basic_block bb, bitmap *use_blocks, bitmap need_phis) | |
296 { | |
297 gimple_stmt_iterator bsi; | |
298 edge e; | |
299 edge_iterator ei; | |
300 | |
301 FOR_EACH_EDGE (e, ei, bb->succs) | |
302 for (bsi = gsi_start_phis (e->dest); !gsi_end_p (bsi); gsi_next (&bsi)) | |
303 find_uses_to_rename_use (bb, PHI_ARG_DEF_FROM_EDGE (gsi_stmt (bsi), e), | |
304 use_blocks, need_phis); | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
305 |
0 | 306 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) |
307 find_uses_to_rename_stmt (gsi_stmt (bsi), use_blocks, need_phis); | |
308 } | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
309 |
0 | 310 /* Marks names that are used outside of the loop they are defined in |
311 for rewrite. Records the set of blocks in that the ssa | |
312 names are defined to USE_BLOCKS. If CHANGED_BBS is not NULL, | |
313 scan only blocks in this set. */ | |
314 | |
315 static void | |
316 find_uses_to_rename (bitmap changed_bbs, bitmap *use_blocks, bitmap need_phis) | |
317 { | |
318 basic_block bb; | |
319 unsigned index; | |
320 bitmap_iterator bi; | |
321 | |
322 if (changed_bbs && !bitmap_empty_p (changed_bbs)) | |
323 { | |
324 EXECUTE_IF_SET_IN_BITMAP (changed_bbs, 0, index, bi) | |
325 { | |
326 find_uses_to_rename_bb (BASIC_BLOCK (index), use_blocks, need_phis); | |
327 } | |
328 } | |
329 else | |
330 { | |
331 FOR_EACH_BB (bb) | |
332 { | |
333 find_uses_to_rename_bb (bb, use_blocks, need_phis); | |
334 } | |
335 } | |
336 } | |
337 | |
338 /* Rewrites the program into a loop closed ssa form -- i.e. inserts extra | |
339 phi nodes to ensure that no variable is used outside the loop it is | |
340 defined in. | |
341 | |
342 This strengthening of the basic ssa form has several advantages: | |
343 | |
344 1) Updating it during unrolling/peeling/versioning is trivial, since | |
345 we do not need to care about the uses outside of the loop. | |
346 2) The behavior of all uses of an induction variable is the same. | |
347 Without this, you need to distinguish the case when the variable | |
348 is used outside of the loop it is defined in, for example | |
349 | |
350 for (i = 0; i < 100; i++) | |
351 { | |
352 for (j = 0; j < 100; j++) | |
353 { | |
354 k = i + j; | |
355 use1 (k); | |
356 } | |
357 use2 (k); | |
358 } | |
359 | |
360 Looking from the outer loop with the normal SSA form, the first use of k | |
361 is not well-behaved, while the second one is an induction variable with | |
362 base 99 and step 1. | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
363 |
0 | 364 If CHANGED_BBS is not NULL, we look for uses outside loops only in |
365 the basic blocks in this set. | |
366 | |
367 UPDATE_FLAG is used in the call to update_ssa. See | |
368 TODO_update_ssa* for documentation. */ | |
369 | |
370 void | |
371 rewrite_into_loop_closed_ssa (bitmap changed_bbs, unsigned update_flag) | |
372 { | |
373 bitmap loop_exits; | |
374 bitmap *use_blocks; | |
375 unsigned i, old_num_ssa_names; | |
376 bitmap names_to_rename; | |
377 | |
378 loops_state_set (LOOP_CLOSED_SSA); | |
379 if (number_of_loops () <= 1) | |
380 return; | |
381 | |
382 loop_exits = get_loops_exits (); | |
383 names_to_rename = BITMAP_ALLOC (NULL); | |
384 | |
385 /* If the pass has caused the SSA form to be out-of-date, update it | |
386 now. */ | |
387 update_ssa (update_flag); | |
388 | |
389 old_num_ssa_names = num_ssa_names; | |
390 use_blocks = XCNEWVEC (bitmap, old_num_ssa_names); | |
391 | |
392 /* Find the uses outside loops. */ | |
393 find_uses_to_rename (changed_bbs, use_blocks, names_to_rename); | |
394 | |
395 /* Add the PHI nodes on exits of the loops for the names we need to | |
396 rewrite. */ | |
397 add_exit_phis (names_to_rename, use_blocks, loop_exits); | |
398 | |
399 for (i = 0; i < old_num_ssa_names; i++) | |
400 BITMAP_FREE (use_blocks[i]); | |
401 free (use_blocks); | |
402 BITMAP_FREE (loop_exits); | |
403 BITMAP_FREE (names_to_rename); | |
404 | |
405 /* Fix up all the names found to be used outside their original | |
406 loops. */ | |
407 update_ssa (TODO_update_ssa); | |
408 } | |
409 | |
410 /* Check invariants of the loop closed ssa form for the USE in BB. */ | |
411 | |
412 static void | |
413 check_loop_closed_ssa_use (basic_block bb, tree use) | |
414 { | |
415 gimple def; | |
416 basic_block def_bb; | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
417 |
0 | 418 if (TREE_CODE (use) != SSA_NAME || !is_gimple_reg (use)) |
419 return; | |
420 | |
421 def = SSA_NAME_DEF_STMT (use); | |
422 def_bb = gimple_bb (def); | |
423 gcc_assert (!def_bb | |
424 || flow_bb_inside_loop_p (def_bb->loop_father, bb)); | |
425 } | |
426 | |
427 /* Checks invariants of loop closed ssa form in statement STMT in BB. */ | |
428 | |
429 static void | |
430 check_loop_closed_ssa_stmt (basic_block bb, gimple stmt) | |
431 { | |
432 ssa_op_iter iter; | |
433 tree var; | |
434 | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
435 if (is_gimple_debug (stmt)) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
436 return; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
437 |
0 | 438 FOR_EACH_SSA_TREE_OPERAND (var, stmt, iter, SSA_OP_ALL_USES) |
439 check_loop_closed_ssa_use (bb, var); | |
440 } | |
441 | |
442 /* Checks that invariants of the loop closed ssa form are preserved. */ | |
443 | |
444 void | |
445 verify_loop_closed_ssa (void) | |
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 | |
456 verify_ssa (false); | |
457 | |
458 FOR_EACH_BB (bb) | |
459 { | |
460 for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
461 { | |
462 phi = gsi_stmt (bsi); | |
463 FOR_EACH_EDGE (e, ei, bb->preds) | |
464 check_loop_closed_ssa_use (e->src, | |
465 PHI_ARG_DEF_FROM_EDGE (phi, e)); | |
466 } | |
467 | |
468 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
469 check_loop_closed_ssa_stmt (bb, gsi_stmt (bsi)); | |
470 } | |
471 } | |
472 | |
473 /* Split loop exit edge EXIT. The things are a bit complicated by a need to | |
474 preserve the loop closed ssa form. The newly created block is returned. */ | |
475 | |
476 basic_block | |
477 split_loop_exit_edge (edge exit) | |
478 { | |
479 basic_block dest = exit->dest; | |
480 basic_block bb = split_edge (exit); | |
481 gimple phi, new_phi; | |
482 tree new_name, name; | |
483 use_operand_p op_p; | |
484 gimple_stmt_iterator psi; | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
485 source_location locus; |
0 | 486 |
487 for (psi = gsi_start_phis (dest); !gsi_end_p (psi); gsi_next (&psi)) | |
488 { | |
489 phi = gsi_stmt (psi); | |
490 op_p = PHI_ARG_DEF_PTR_FROM_EDGE (phi, single_succ_edge (bb)); | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
491 locus = gimple_phi_arg_location_from_edge (phi, single_succ_edge (bb)); |
0 | 492 |
493 name = USE_FROM_PTR (op_p); | |
494 | |
495 /* If the argument of the PHI node is a constant, we do not need | |
496 to keep it inside loop. */ | |
497 if (TREE_CODE (name) != SSA_NAME) | |
498 continue; | |
499 | |
500 /* Otherwise create an auxiliary phi node that will copy the value | |
501 of the SSA name out of the loop. */ | |
502 new_name = duplicate_ssa_name (name, NULL); | |
503 new_phi = create_phi_node (new_name, bb); | |
504 SSA_NAME_DEF_STMT (new_name) = new_phi; | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
505 add_phi_arg (new_phi, name, exit, locus); |
0 | 506 SET_USE (op_p, new_name); |
507 } | |
508 | |
509 return bb; | |
510 } | |
511 | |
512 /* Returns the basic block in that statements should be emitted for induction | |
513 variables incremented at the end of the LOOP. */ | |
514 | |
515 basic_block | |
516 ip_end_pos (struct loop *loop) | |
517 { | |
518 return loop->latch; | |
519 } | |
520 | |
521 /* Returns the basic block in that statements should be emitted for induction | |
522 variables incremented just before exit condition of a LOOP. */ | |
523 | |
524 basic_block | |
525 ip_normal_pos (struct loop *loop) | |
526 { | |
527 gimple last; | |
528 basic_block bb; | |
529 edge exit; | |
530 | |
531 if (!single_pred_p (loop->latch)) | |
532 return NULL; | |
533 | |
534 bb = single_pred (loop->latch); | |
535 last = last_stmt (bb); | |
536 if (!last | |
537 || gimple_code (last) != GIMPLE_COND) | |
538 return NULL; | |
539 | |
540 exit = EDGE_SUCC (bb, 0); | |
541 if (exit->dest == loop->latch) | |
542 exit = EDGE_SUCC (bb, 1); | |
543 | |
544 if (flow_bb_inside_loop_p (loop, exit->dest)) | |
545 return NULL; | |
546 | |
547 return bb; | |
548 } | |
549 | |
550 /* Stores the standard position for induction variable increment in LOOP | |
551 (just before the exit condition if it is available and latch block is empty, | |
552 end of the latch block otherwise) to BSI. INSERT_AFTER is set to true if | |
553 the increment should be inserted after *BSI. */ | |
554 | |
555 void | |
556 standard_iv_increment_position (struct loop *loop, gimple_stmt_iterator *bsi, | |
557 bool *insert_after) | |
558 { | |
559 basic_block bb = ip_normal_pos (loop), latch = ip_end_pos (loop); | |
560 gimple last = last_stmt (latch); | |
561 | |
562 if (!bb | |
563 || (last && gimple_code (last) != GIMPLE_LABEL)) | |
564 { | |
565 *bsi = gsi_last_bb (latch); | |
566 *insert_after = true; | |
567 } | |
568 else | |
569 { | |
570 *bsi = gsi_last_bb (bb); | |
571 *insert_after = false; | |
572 } | |
573 } | |
574 | |
575 /* Copies phi node arguments for duplicated blocks. The index of the first | |
576 duplicated block is FIRST_NEW_BLOCK. */ | |
577 | |
578 static void | |
579 copy_phi_node_args (unsigned first_new_block) | |
580 { | |
581 unsigned i; | |
582 | |
583 for (i = first_new_block; i < (unsigned) last_basic_block; i++) | |
584 BASIC_BLOCK (i)->flags |= BB_DUPLICATED; | |
585 | |
586 for (i = first_new_block; i < (unsigned) last_basic_block; i++) | |
587 add_phi_args_after_copy_bb (BASIC_BLOCK (i)); | |
588 | |
589 for (i = first_new_block; i < (unsigned) last_basic_block; i++) | |
590 BASIC_BLOCK (i)->flags &= ~BB_DUPLICATED; | |
591 } | |
592 | |
593 | |
594 /* The same as cfgloopmanip.c:duplicate_loop_to_header_edge, but also | |
595 updates the PHI nodes at start of the copied region. In order to | |
596 achieve this, only loops whose exits all lead to the same location | |
597 are handled. | |
598 | |
599 Notice that we do not completely update the SSA web after | |
600 duplication. The caller is responsible for calling update_ssa | |
601 after the loop has been duplicated. */ | |
602 | |
603 bool | |
604 gimple_duplicate_loop_to_header_edge (struct loop *loop, edge e, | |
605 unsigned int ndupl, sbitmap wont_exit, | |
606 edge orig, VEC (edge, heap) **to_remove, | |
607 int flags) | |
608 { | |
609 unsigned first_new_block; | |
610 | |
611 if (!loops_state_satisfies_p (LOOPS_HAVE_SIMPLE_LATCHES)) | |
612 return false; | |
613 if (!loops_state_satisfies_p (LOOPS_HAVE_PREHEADERS)) | |
614 return false; | |
615 | |
616 #ifdef ENABLE_CHECKING | |
617 if (loops_state_satisfies_p (LOOP_CLOSED_SSA)) | |
618 verify_loop_closed_ssa (); | |
619 #endif | |
620 | |
621 first_new_block = last_basic_block; | |
622 if (!duplicate_loop_to_header_edge (loop, e, ndupl, wont_exit, | |
623 orig, to_remove, flags)) | |
624 return false; | |
625 | |
626 /* Readd the removed phi args for e. */ | |
627 flush_pending_stmts (e); | |
628 | |
629 /* Copy the phi node arguments. */ | |
630 copy_phi_node_args (first_new_block); | |
631 | |
632 scev_reset (); | |
633 | |
634 return true; | |
635 } | |
636 | |
637 /* Returns true if we can unroll LOOP FACTOR times. Number | |
638 of iterations of the loop is returned in NITER. */ | |
639 | |
640 bool | |
641 can_unroll_loop_p (struct loop *loop, unsigned factor, | |
642 struct tree_niter_desc *niter) | |
643 { | |
644 edge exit; | |
645 | |
646 /* Check whether unrolling is possible. We only want to unroll loops | |
647 for that we are able to determine number of iterations. We also | |
648 want to split the extra iterations of the loop from its end, | |
649 therefore we require that the loop has precisely one | |
650 exit. */ | |
651 | |
652 exit = single_dom_exit (loop); | |
653 if (!exit) | |
654 return false; | |
655 | |
656 if (!number_of_iterations_exit (loop, exit, niter, false) | |
657 || niter->cmp == ERROR_MARK | |
658 /* Scalar evolutions analysis might have copy propagated | |
659 the abnormal ssa names into these expressions, hence | |
660 emitting the computations based on them during loop | |
661 unrolling might create overlapping life ranges for | |
662 them, and failures in out-of-ssa. */ | |
663 || contains_abnormal_ssa_name_p (niter->may_be_zero) | |
664 || contains_abnormal_ssa_name_p (niter->control.base) | |
665 || contains_abnormal_ssa_name_p (niter->control.step) | |
666 || contains_abnormal_ssa_name_p (niter->bound)) | |
667 return false; | |
668 | |
669 /* And of course, we must be able to duplicate the loop. */ | |
670 if (!can_duplicate_loop_p (loop)) | |
671 return false; | |
672 | |
673 /* The final loop should be small enough. */ | |
674 if (tree_num_loop_insns (loop, &eni_size_weights) * factor | |
675 > (unsigned) PARAM_VALUE (PARAM_MAX_UNROLLED_INSNS)) | |
676 return false; | |
677 | |
678 return true; | |
679 } | |
680 | |
681 /* Determines the conditions that control execution of LOOP unrolled FACTOR | |
682 times. DESC is number of iterations of LOOP. ENTER_COND is set to | |
683 condition that must be true if the main loop can be entered. | |
684 EXIT_BASE, EXIT_STEP, EXIT_CMP and EXIT_BOUND are set to values describing | |
685 how the exit from the unrolled loop should be controlled. */ | |
686 | |
687 static void | |
688 determine_exit_conditions (struct loop *loop, struct tree_niter_desc *desc, | |
689 unsigned factor, tree *enter_cond, | |
690 tree *exit_base, tree *exit_step, | |
691 enum tree_code *exit_cmp, tree *exit_bound) | |
692 { | |
693 gimple_seq stmts; | |
694 tree base = desc->control.base; | |
695 tree step = desc->control.step; | |
696 tree bound = desc->bound; | |
697 tree type = TREE_TYPE (step); | |
698 tree bigstep, delta; | |
699 tree min = lower_bound_in_type (type, type); | |
700 tree max = upper_bound_in_type (type, type); | |
701 enum tree_code cmp = desc->cmp; | |
702 tree cond = boolean_true_node, assum; | |
703 | |
704 /* For pointers, do the arithmetics in the type of step (sizetype). */ | |
705 base = fold_convert (type, base); | |
706 bound = fold_convert (type, bound); | |
707 | |
708 *enter_cond = boolean_false_node; | |
709 *exit_base = NULL_TREE; | |
710 *exit_step = NULL_TREE; | |
711 *exit_cmp = ERROR_MARK; | |
712 *exit_bound = NULL_TREE; | |
713 gcc_assert (cmp != ERROR_MARK); | |
714 | |
715 /* We only need to be correct when we answer question | |
716 "Do at least FACTOR more iterations remain?" in the unrolled loop. | |
717 Thus, transforming BASE + STEP * i <> BOUND to | |
718 BASE + STEP * i < BOUND is ok. */ | |
719 if (cmp == NE_EXPR) | |
720 { | |
721 if (tree_int_cst_sign_bit (step)) | |
722 cmp = GT_EXPR; | |
723 else | |
724 cmp = LT_EXPR; | |
725 } | |
726 else if (cmp == LT_EXPR) | |
727 { | |
728 gcc_assert (!tree_int_cst_sign_bit (step)); | |
729 } | |
730 else if (cmp == GT_EXPR) | |
731 { | |
732 gcc_assert (tree_int_cst_sign_bit (step)); | |
733 } | |
734 else | |
735 gcc_unreachable (); | |
736 | |
737 /* The main body of the loop may be entered iff: | |
738 | |
739 1) desc->may_be_zero is false. | |
740 2) it is possible to check that there are at least FACTOR iterations | |
741 of the loop, i.e., BOUND - step * FACTOR does not overflow. | |
742 3) # of iterations is at least FACTOR */ | |
743 | |
744 if (!integer_zerop (desc->may_be_zero)) | |
745 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, | |
746 invert_truthvalue (desc->may_be_zero), | |
747 cond); | |
748 | |
749 bigstep = fold_build2 (MULT_EXPR, type, step, | |
750 build_int_cst_type (type, factor)); | |
751 delta = fold_build2 (MINUS_EXPR, type, bigstep, step); | |
752 if (cmp == LT_EXPR) | |
753 assum = fold_build2 (GE_EXPR, boolean_type_node, | |
754 bound, | |
755 fold_build2 (PLUS_EXPR, type, min, delta)); | |
756 else | |
757 assum = fold_build2 (LE_EXPR, boolean_type_node, | |
758 bound, | |
759 fold_build2 (PLUS_EXPR, type, max, delta)); | |
760 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, assum, cond); | |
761 | |
762 bound = fold_build2 (MINUS_EXPR, type, bound, delta); | |
763 assum = fold_build2 (cmp, boolean_type_node, base, bound); | |
764 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, assum, cond); | |
765 | |
766 cond = force_gimple_operand (unshare_expr (cond), &stmts, false, NULL_TREE); | |
767 if (stmts) | |
768 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
769 /* cond now may be a gimple comparison, which would be OK, but also any | |
770 other gimple rhs (say a && b). In this case we need to force it to | |
771 operand. */ | |
772 if (!is_gimple_condexpr (cond)) | |
773 { | |
774 cond = force_gimple_operand (cond, &stmts, true, NULL_TREE); | |
775 if (stmts) | |
776 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
777 } | |
778 *enter_cond = cond; | |
779 | |
780 base = force_gimple_operand (unshare_expr (base), &stmts, true, NULL_TREE); | |
781 if (stmts) | |
782 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
783 bound = force_gimple_operand (unshare_expr (bound), &stmts, true, NULL_TREE); | |
784 if (stmts) | |
785 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
786 | |
787 *exit_base = base; | |
788 *exit_step = bigstep; | |
789 *exit_cmp = cmp; | |
790 *exit_bound = bound; | |
791 } | |
792 | |
793 /* Scales the frequencies of all basic blocks in LOOP that are strictly | |
794 dominated by BB by NUM/DEN. */ | |
795 | |
796 static void | |
797 scale_dominated_blocks_in_loop (struct loop *loop, basic_block bb, | |
798 int num, int den) | |
799 { | |
800 basic_block son; | |
801 | |
802 if (den == 0) | |
803 return; | |
804 | |
805 for (son = first_dom_son (CDI_DOMINATORS, bb); | |
806 son; | |
807 son = next_dom_son (CDI_DOMINATORS, son)) | |
808 { | |
809 if (!flow_bb_inside_loop_p (loop, son)) | |
810 continue; | |
811 scale_bbs_frequencies_int (&son, 1, num, den); | |
812 scale_dominated_blocks_in_loop (loop, son, num, den); | |
813 } | |
814 } | |
815 | |
816 /* Unroll LOOP FACTOR times. DESC describes number of iterations of LOOP. | |
817 EXIT is the exit of the loop to that DESC corresponds. | |
818 | |
819 If N is number of iterations of the loop and MAY_BE_ZERO is the condition | |
820 under that loop exits in the first iteration even if N != 0, | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
821 |
0 | 822 while (1) |
823 { | |
824 x = phi (init, next); | |
825 | |
826 pre; | |
827 if (st) | |
828 break; | |
829 post; | |
830 } | |
831 | |
832 becomes (with possibly the exit conditions formulated a bit differently, | |
833 avoiding the need to create a new iv): | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
834 |
0 | 835 if (MAY_BE_ZERO || N < FACTOR) |
836 goto rest; | |
837 | |
838 do | |
839 { | |
840 x = phi (init, next); | |
841 | |
842 pre; | |
843 post; | |
844 pre; | |
845 post; | |
846 ... | |
847 pre; | |
848 post; | |
849 N -= FACTOR; | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
850 |
0 | 851 } while (N >= FACTOR); |
852 | |
853 rest: | |
854 init' = phi (init, x); | |
855 | |
856 while (1) | |
857 { | |
858 x = phi (init', next); | |
859 | |
860 pre; | |
861 if (st) | |
862 break; | |
863 post; | |
864 } | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
865 |
0 | 866 Before the loop is unrolled, TRANSFORM is called for it (only for the |
867 unrolled loop, but not for its versioned copy). DATA is passed to | |
868 TRANSFORM. */ | |
869 | |
870 /* Probability in % that the unrolled loop is entered. Just a guess. */ | |
871 #define PROB_UNROLLED_LOOP_ENTERED 90 | |
872 | |
873 void | |
874 tree_transform_and_unroll_loop (struct loop *loop, unsigned factor, | |
875 edge exit, struct tree_niter_desc *desc, | |
876 transform_callback transform, | |
877 void *data) | |
878 { | |
879 gimple exit_if; | |
880 tree ctr_before, ctr_after; | |
881 tree enter_main_cond, exit_base, exit_step, exit_bound; | |
882 enum tree_code exit_cmp; | |
883 gimple phi_old_loop, phi_new_loop, phi_rest; | |
884 gimple_stmt_iterator psi_old_loop, psi_new_loop; | |
885 tree init, next, new_init, var; | |
886 struct loop *new_loop; | |
887 basic_block rest, exit_bb; | |
888 edge old_entry, new_entry, old_latch, precond_edge, new_exit; | |
889 edge new_nonexit, e; | |
890 gimple_stmt_iterator bsi; | |
891 use_operand_p op; | |
892 bool ok; | |
893 unsigned est_niter, prob_entry, scale_unrolled, scale_rest, freq_e, freq_h; | |
894 unsigned new_est_niter, i, prob; | |
895 unsigned irr = loop_preheader_edge (loop)->flags & EDGE_IRREDUCIBLE_LOOP; | |
896 sbitmap wont_exit; | |
897 VEC (edge, heap) *to_remove = NULL; | |
898 | |
899 est_niter = expected_loop_iterations (loop); | |
900 determine_exit_conditions (loop, desc, factor, | |
901 &enter_main_cond, &exit_base, &exit_step, | |
902 &exit_cmp, &exit_bound); | |
903 | |
904 /* Let us assume that the unrolled loop is quite likely to be entered. */ | |
905 if (integer_nonzerop (enter_main_cond)) | |
906 prob_entry = REG_BR_PROB_BASE; | |
907 else | |
908 prob_entry = PROB_UNROLLED_LOOP_ENTERED * REG_BR_PROB_BASE / 100; | |
909 | |
910 /* The values for scales should keep profile consistent, and somewhat close | |
911 to correct. | |
912 | |
913 TODO: The current value of SCALE_REST makes it appear that the loop that | |
914 is created by splitting the remaining iterations of the unrolled loop is | |
915 executed the same number of times as the original loop, and with the same | |
916 frequencies, which is obviously wrong. This does not appear to cause | |
917 problems, so we do not bother with fixing it for now. To make the profile | |
918 correct, we would need to change the probability of the exit edge of the | |
919 loop, and recompute the distribution of frequencies in its body because | |
920 of this change (scale the frequencies of blocks before and after the exit | |
921 by appropriate factors). */ | |
922 scale_unrolled = prob_entry; | |
923 scale_rest = REG_BR_PROB_BASE; | |
924 | |
925 new_loop = loop_version (loop, enter_main_cond, NULL, | |
926 prob_entry, scale_unrolled, scale_rest, true); | |
927 gcc_assert (new_loop != NULL); | |
928 update_ssa (TODO_update_ssa); | |
929 | |
930 /* Determine the probability of the exit edge of the unrolled loop. */ | |
931 new_est_niter = est_niter / factor; | |
932 | |
933 /* Without profile feedback, loops for that we do not know a better estimate | |
934 are assumed to roll 10 times. When we unroll such loop, it appears to | |
935 roll too little, and it may even seem to be cold. To avoid this, we | |
936 ensure that the created loop appears to roll at least 5 times (but at | |
937 most as many times as before unrolling). */ | |
938 if (new_est_niter < 5) | |
939 { | |
940 if (est_niter < 5) | |
941 new_est_niter = est_niter; | |
942 else | |
943 new_est_niter = 5; | |
944 } | |
945 | |
946 /* Prepare the cfg and update the phi nodes. Move the loop exit to the | |
947 loop latch (and make its condition dummy, for the moment). */ | |
948 rest = loop_preheader_edge (new_loop)->src; | |
949 precond_edge = single_pred_edge (rest); | |
950 split_edge (loop_latch_edge (loop)); | |
951 exit_bb = single_pred (loop->latch); | |
952 | |
953 /* Since the exit edge will be removed, the frequency of all the blocks | |
954 in the loop that are dominated by it must be scaled by | |
955 1 / (1 - exit->probability). */ | |
956 scale_dominated_blocks_in_loop (loop, exit->src, | |
957 REG_BR_PROB_BASE, | |
958 REG_BR_PROB_BASE - exit->probability); | |
959 | |
960 bsi = gsi_last_bb (exit_bb); | |
961 exit_if = gimple_build_cond (EQ_EXPR, integer_zero_node, | |
962 integer_zero_node, | |
963 NULL_TREE, NULL_TREE); | |
964 | |
965 gsi_insert_after (&bsi, exit_if, GSI_NEW_STMT); | |
966 new_exit = make_edge (exit_bb, rest, EDGE_FALSE_VALUE | irr); | |
967 rescan_loop_exit (new_exit, true, false); | |
968 | |
969 /* Set the probability of new exit to the same of the old one. Fix | |
970 the frequency of the latch block, by scaling it back by | |
971 1 - exit->probability. */ | |
972 new_exit->count = exit->count; | |
973 new_exit->probability = exit->probability; | |
974 new_nonexit = single_pred_edge (loop->latch); | |
975 new_nonexit->probability = REG_BR_PROB_BASE - exit->probability; | |
976 new_nonexit->flags = EDGE_TRUE_VALUE; | |
977 new_nonexit->count -= exit->count; | |
978 if (new_nonexit->count < 0) | |
979 new_nonexit->count = 0; | |
980 scale_bbs_frequencies_int (&loop->latch, 1, new_nonexit->probability, | |
981 REG_BR_PROB_BASE); | |
982 | |
983 old_entry = loop_preheader_edge (loop); | |
984 new_entry = loop_preheader_edge (new_loop); | |
985 old_latch = loop_latch_edge (loop); | |
986 for (psi_old_loop = gsi_start_phis (loop->header), | |
987 psi_new_loop = gsi_start_phis (new_loop->header); | |
988 !gsi_end_p (psi_old_loop); | |
989 gsi_next (&psi_old_loop), gsi_next (&psi_new_loop)) | |
990 { | |
991 phi_old_loop = gsi_stmt (psi_old_loop); | |
992 phi_new_loop = gsi_stmt (psi_new_loop); | |
993 | |
994 init = PHI_ARG_DEF_FROM_EDGE (phi_old_loop, old_entry); | |
995 op = PHI_ARG_DEF_PTR_FROM_EDGE (phi_new_loop, new_entry); | |
996 gcc_assert (operand_equal_for_phi_arg_p (init, USE_FROM_PTR (op))); | |
997 next = PHI_ARG_DEF_FROM_EDGE (phi_old_loop, old_latch); | |
998 | |
999 /* Prefer using original variable as a base for the new ssa name. | |
1000 This is necessary for virtual ops, and useful in order to avoid | |
1001 losing debug info for real ops. */ | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1002 if (TREE_CODE (next) == SSA_NAME |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1003 && useless_type_conversion_p (TREE_TYPE (next), |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1004 TREE_TYPE (init))) |
0 | 1005 var = SSA_NAME_VAR (next); |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1006 else if (TREE_CODE (init) == SSA_NAME |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1007 && useless_type_conversion_p (TREE_TYPE (init), |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1008 TREE_TYPE (next))) |
0 | 1009 var = SSA_NAME_VAR (init); |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1010 else if (useless_type_conversion_p (TREE_TYPE (next), TREE_TYPE (init))) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1011 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1012 var = create_tmp_var (TREE_TYPE (next), "unrinittmp"); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1013 add_referenced_var (var); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1014 } |
0 | 1015 else |
1016 { | |
1017 var = create_tmp_var (TREE_TYPE (init), "unrinittmp"); | |
1018 add_referenced_var (var); | |
1019 } | |
1020 | |
1021 new_init = make_ssa_name (var, NULL); | |
1022 phi_rest = create_phi_node (new_init, rest); | |
1023 SSA_NAME_DEF_STMT (new_init) = phi_rest; | |
1024 | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1025 add_phi_arg (phi_rest, init, precond_edge, UNKNOWN_LOCATION); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1026 add_phi_arg (phi_rest, next, new_exit, UNKNOWN_LOCATION); |
0 | 1027 SET_USE (op, new_init); |
1028 } | |
1029 | |
1030 remove_path (exit); | |
1031 | |
1032 /* Transform the loop. */ | |
1033 if (transform) | |
1034 (*transform) (loop, data); | |
1035 | |
1036 /* Unroll the loop and remove the exits in all iterations except for the | |
1037 last one. */ | |
1038 wont_exit = sbitmap_alloc (factor); | |
1039 sbitmap_ones (wont_exit); | |
1040 RESET_BIT (wont_exit, factor - 1); | |
1041 | |
1042 ok = gimple_duplicate_loop_to_header_edge | |
1043 (loop, loop_latch_edge (loop), factor - 1, | |
1044 wont_exit, new_exit, &to_remove, DLTHE_FLAG_UPDATE_FREQ); | |
1045 free (wont_exit); | |
1046 gcc_assert (ok); | |
1047 | |
1048 for (i = 0; VEC_iterate (edge, to_remove, i, e); i++) | |
1049 { | |
1050 ok = remove_path (e); | |
1051 gcc_assert (ok); | |
1052 } | |
1053 VEC_free (edge, heap, to_remove); | |
1054 update_ssa (TODO_update_ssa); | |
1055 | |
1056 /* Ensure that the frequencies in the loop match the new estimated | |
1057 number of iterations, and change the probability of the new | |
1058 exit edge. */ | |
1059 freq_h = loop->header->frequency; | |
1060 freq_e = EDGE_FREQUENCY (loop_preheader_edge (loop)); | |
1061 if (freq_h != 0) | |
1062 scale_loop_frequencies (loop, freq_e * (new_est_niter + 1), freq_h); | |
1063 | |
1064 exit_bb = single_pred (loop->latch); | |
1065 new_exit = find_edge (exit_bb, rest); | |
1066 new_exit->count = loop_preheader_edge (loop)->count; | |
1067 new_exit->probability = REG_BR_PROB_BASE / (new_est_niter + 1); | |
1068 | |
1069 rest->count += new_exit->count; | |
1070 rest->frequency += EDGE_FREQUENCY (new_exit); | |
1071 | |
1072 new_nonexit = single_pred_edge (loop->latch); | |
1073 prob = new_nonexit->probability; | |
1074 new_nonexit->probability = REG_BR_PROB_BASE - new_exit->probability; | |
1075 new_nonexit->count = exit_bb->count - new_exit->count; | |
1076 if (new_nonexit->count < 0) | |
1077 new_nonexit->count = 0; | |
1078 if (prob > 0) | |
1079 scale_bbs_frequencies_int (&loop->latch, 1, new_nonexit->probability, | |
1080 prob); | |
1081 | |
1082 /* Finally create the new counter for number of iterations and add the new | |
1083 exit instruction. */ | |
1084 bsi = gsi_last_bb (exit_bb); | |
1085 exit_if = gsi_stmt (bsi); | |
1086 create_iv (exit_base, exit_step, NULL_TREE, loop, | |
1087 &bsi, false, &ctr_before, &ctr_after); | |
1088 gimple_cond_set_code (exit_if, exit_cmp); | |
1089 gimple_cond_set_lhs (exit_if, ctr_after); | |
1090 gimple_cond_set_rhs (exit_if, exit_bound); | |
1091 update_stmt (exit_if); | |
1092 | |
1093 #ifdef ENABLE_CHECKING | |
1094 verify_flow_info (); | |
1095 verify_dominators (CDI_DOMINATORS); | |
1096 verify_loop_structure (); | |
1097 verify_loop_closed_ssa (); | |
1098 #endif | |
1099 } | |
1100 | |
1101 /* Wrapper over tree_transform_and_unroll_loop for case we do not | |
1102 want to transform the loop before unrolling. The meaning | |
1103 of the arguments is the same as for tree_transform_and_unroll_loop. */ | |
1104 | |
1105 void | |
1106 tree_unroll_loop (struct loop *loop, unsigned factor, | |
1107 edge exit, struct tree_niter_desc *desc) | |
1108 { | |
1109 tree_transform_and_unroll_loop (loop, factor, exit, desc, | |
1110 NULL, NULL); | |
1111 } | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1112 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1113 /* Rewrite the phi node at position PSI in function of the main |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1114 induction variable MAIN_IV and insert the generated code at GSI. */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1115 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1116 static void |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1117 rewrite_phi_with_iv (loop_p loop, |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1118 gimple_stmt_iterator *psi, |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1119 gimple_stmt_iterator *gsi, |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1120 tree main_iv) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1121 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1122 affine_iv iv; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1123 gimple stmt, phi = gsi_stmt (*psi); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1124 tree atype, mtype, val, res = PHI_RESULT (phi); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1125 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1126 if (!is_gimple_reg (res) || res == main_iv) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1127 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1128 gsi_next (psi); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1129 return; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1130 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1131 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1132 if (!simple_iv (loop, loop, res, &iv, true)) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1133 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1134 gsi_next (psi); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1135 return; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1136 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1137 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1138 remove_phi_node (psi, false); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1139 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1140 atype = TREE_TYPE (res); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1141 mtype = POINTER_TYPE_P (atype) ? sizetype : atype; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1142 val = fold_build2 (MULT_EXPR, mtype, unshare_expr (iv.step), |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1143 fold_convert (mtype, main_iv)); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1144 val = fold_build2 (POINTER_TYPE_P (atype) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1145 ? POINTER_PLUS_EXPR : PLUS_EXPR, |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1146 atype, unshare_expr (iv.base), val); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1147 val = force_gimple_operand_gsi (gsi, val, false, NULL_TREE, true, |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1148 GSI_SAME_STMT); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1149 stmt = gimple_build_assign (res, val); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1150 gsi_insert_before (gsi, stmt, GSI_SAME_STMT); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1151 SSA_NAME_DEF_STMT (res) = stmt; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1152 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1153 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1154 /* Rewrite all the phi nodes of LOOP in function of the main induction |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1155 variable MAIN_IV. */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1156 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1157 static void |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1158 rewrite_all_phi_nodes_with_iv (loop_p loop, tree main_iv) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1159 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1160 unsigned i; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1161 basic_block *bbs = get_loop_body_in_dom_order (loop); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1162 gimple_stmt_iterator psi; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1163 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1164 for (i = 0; i < loop->num_nodes; i++) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1165 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1166 basic_block bb = bbs[i]; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1167 gimple_stmt_iterator gsi = gsi_after_labels (bb); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1168 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1169 if (bb->loop_father != loop) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1170 continue; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1171 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1172 for (psi = gsi_start_phis (bb); !gsi_end_p (psi); ) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1173 rewrite_phi_with_iv (loop, &psi, &gsi, main_iv); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1174 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1175 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1176 free (bbs); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1177 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1178 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1179 /* Bases all the induction variables in LOOP on a single induction |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1180 variable (unsigned with base 0 and step 1), whose final value is |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1181 compared with *NIT. When the IV type precision has to be larger |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1182 than *NIT type precision, *NIT is converted to the larger type, the |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1183 conversion code is inserted before the loop, and *NIT is updated to |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1184 the new definition. The induction variable is incremented in the |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1185 loop latch. Return the induction variable that was created. */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1186 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1187 tree |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1188 canonicalize_loop_ivs (struct loop *loop, tree *nit) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1189 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1190 unsigned precision = TYPE_PRECISION (TREE_TYPE (*nit)); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1191 unsigned original_precision = precision; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1192 tree type, var_before; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1193 gimple_stmt_iterator gsi, psi; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1194 gimple stmt; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1195 edge exit = single_dom_exit (loop); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1196 gimple_seq stmts; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1197 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1198 for (psi = gsi_start_phis (loop->header); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1199 !gsi_end_p (psi); gsi_next (&psi)) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1200 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1201 gimple phi = gsi_stmt (psi); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1202 tree res = PHI_RESULT (phi); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1203 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1204 if (is_gimple_reg (res) && TYPE_PRECISION (TREE_TYPE (res)) > precision) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1205 precision = TYPE_PRECISION (TREE_TYPE (res)); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1206 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1207 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1208 type = lang_hooks.types.type_for_size (precision, 1); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1209 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1210 if (original_precision != precision) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1211 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1212 *nit = fold_convert (type, *nit); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1213 *nit = force_gimple_operand (*nit, &stmts, true, NULL_TREE); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1214 if (stmts) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1215 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1216 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1217 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1218 gsi = gsi_last_bb (loop->latch); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1219 create_iv (build_int_cst_type (type, 0), build_int_cst (type, 1), NULL_TREE, |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1220 loop, &gsi, true, &var_before, NULL); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1221 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1222 rewrite_all_phi_nodes_with_iv (loop, var_before); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1223 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1224 stmt = last_stmt (exit->src); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1225 /* Make the loop exit if the control condition is not satisfied. */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1226 if (exit->flags & EDGE_TRUE_VALUE) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1227 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1228 edge te, fe; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1229 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1230 extract_true_false_edges_from_block (exit->src, &te, &fe); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1231 te->flags = EDGE_FALSE_VALUE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1232 fe->flags = EDGE_TRUE_VALUE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1233 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1234 gimple_cond_set_code (stmt, LT_EXPR); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1235 gimple_cond_set_lhs (stmt, var_before); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1236 gimple_cond_set_rhs (stmt, *nit); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1237 update_stmt (stmt); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1238 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1239 return var_before; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1240 } |