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b8698a0f | 1 | /* Vectorizer Specific Loop Manipulations |
85ec4feb | 2 | Copyright (C) 2003-2018 Free Software Foundation, Inc. |
b8698a0f | 3 | Contributed by Dorit Naishlos <dorit@il.ibm.com> |
ebfd146a IR |
4 | and Ira Rosen <irar@il.ibm.com> |
5 | ||
6 | This file is part of GCC. | |
7 | ||
8 | GCC is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
10 | Software Foundation; either version 3, or (at your option) any later | |
11 | version. | |
12 | ||
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GCC; see the file COPYING3. If not see | |
20 | <http://www.gnu.org/licenses/>. */ | |
21 | ||
22 | #include "config.h" | |
23 | #include "system.h" | |
24 | #include "coretypes.h" | |
c7131fb2 | 25 | #include "backend.h" |
40e23961 | 26 | #include "tree.h" |
c7131fb2 | 27 | #include "gimple.h" |
957060b5 AM |
28 | #include "cfghooks.h" |
29 | #include "tree-pass.h" | |
c7131fb2 | 30 | #include "ssa.h" |
c7131fb2 | 31 | #include "fold-const.h" |
60393bbc | 32 | #include "cfganal.h" |
45b0be94 | 33 | #include "gimplify.h" |
5be5c238 | 34 | #include "gimple-iterator.h" |
18f429e2 | 35 | #include "gimplify-me.h" |
442b4905 | 36 | #include "tree-cfg.h" |
e28030cf | 37 | #include "tree-ssa-loop-manip.h" |
442b4905 | 38 | #include "tree-into-ssa.h" |
7a300452 | 39 | #include "tree-ssa.h" |
ebfd146a | 40 | #include "cfgloop.h" |
ebfd146a IR |
41 | #include "tree-scalar-evolution.h" |
42 | #include "tree-vectorizer.h" | |
2a93954e | 43 | #include "tree-ssa-loop-ivopts.h" |
0f26839a | 44 | #include "gimple-fold.h" |
7cfb4d93 RS |
45 | #include "tree-ssa-loop-niter.h" |
46 | #include "internal-fn.h" | |
47 | #include "stor-layout.h" | |
48 | #include "optabs-query.h" | |
49 | #include "vec-perm-indices.h" | |
ebfd146a IR |
50 | |
51 | /************************************************************************* | |
52 | Simple Loop Peeling Utilities | |
53 | ||
54 | Utilities to support loop peeling for vectorization purposes. | |
55 | *************************************************************************/ | |
56 | ||
57 | ||
58 | /* Renames the use *OP_P. */ | |
59 | ||
60 | static void | |
61 | rename_use_op (use_operand_p op_p) | |
62 | { | |
63 | tree new_name; | |
64 | ||
65 | if (TREE_CODE (USE_FROM_PTR (op_p)) != SSA_NAME) | |
66 | return; | |
67 | ||
68 | new_name = get_current_def (USE_FROM_PTR (op_p)); | |
69 | ||
70 | /* Something defined outside of the loop. */ | |
71 | if (!new_name) | |
72 | return; | |
73 | ||
74 | /* An ordinary ssa name defined in the loop. */ | |
75 | ||
76 | SET_USE (op_p, new_name); | |
77 | } | |
78 | ||
79 | ||
cb330ba5 | 80 | /* Renames the variables in basic block BB. Allow renaming of PHI arguments |
a6c51a12 YR |
81 | on edges incoming from outer-block header if RENAME_FROM_OUTER_LOOP is |
82 | true. */ | |
ebfd146a | 83 | |
2cfc56b9 | 84 | static void |
a6c51a12 | 85 | rename_variables_in_bb (basic_block bb, bool rename_from_outer_loop) |
ebfd146a | 86 | { |
355fe088 | 87 | gimple *stmt; |
ebfd146a IR |
88 | use_operand_p use_p; |
89 | ssa_op_iter iter; | |
90 | edge e; | |
91 | edge_iterator ei; | |
92 | struct loop *loop = bb->loop_father; | |
a6c51a12 YR |
93 | struct loop *outer_loop = NULL; |
94 | ||
95 | if (rename_from_outer_loop) | |
96 | { | |
97 | gcc_assert (loop); | |
98 | outer_loop = loop_outer (loop); | |
99 | } | |
ebfd146a | 100 | |
538dd0b7 DM |
101 | for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi); |
102 | gsi_next (&gsi)) | |
ebfd146a IR |
103 | { |
104 | stmt = gsi_stmt (gsi); | |
105 | FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_ALL_USES) | |
106 | rename_use_op (use_p); | |
107 | } | |
108 | ||
2cfc56b9 | 109 | FOR_EACH_EDGE (e, ei, bb->preds) |
ebfd146a | 110 | { |
cb330ba5 JJ |
111 | if (!flow_bb_inside_loop_p (loop, e->src)) |
112 | { | |
113 | if (!rename_from_outer_loop) | |
114 | continue; | |
115 | if (e->src != outer_loop->header) | |
116 | { | |
117 | if (outer_loop->inner->next) | |
118 | { | |
119 | /* If outer_loop has 2 inner loops, allow there to | |
120 | be an extra basic block which decides which of the | |
121 | two loops to use using LOOP_VECTORIZED. */ | |
122 | if (!single_pred_p (e->src) | |
123 | || single_pred (e->src) != outer_loop->header) | |
124 | continue; | |
125 | } | |
cb330ba5 JJ |
126 | } |
127 | } | |
538dd0b7 DM |
128 | for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi); |
129 | gsi_next (&gsi)) | |
130 | rename_use_op (PHI_ARG_DEF_PTR_FROM_EDGE (gsi.phi (), e)); | |
ebfd146a IR |
131 | } |
132 | } | |
133 | ||
134 | ||
a79683d5 | 135 | struct adjust_info |
684f25f4 AO |
136 | { |
137 | tree from, to; | |
138 | basic_block bb; | |
a79683d5 | 139 | }; |
684f25f4 | 140 | |
684f25f4 AO |
141 | /* A stack of values to be adjusted in debug stmts. We have to |
142 | process them LIFO, so that the closest substitution applies. If we | |
143 | processed them FIFO, without the stack, we might substitute uses | |
144 | with a PHI DEF that would soon become non-dominant, and when we got | |
145 | to the suitable one, it wouldn't have anything to substitute any | |
146 | more. */ | |
ff4c81cc | 147 | static vec<adjust_info, va_heap> adjust_vec; |
684f25f4 AO |
148 | |
149 | /* Adjust any debug stmts that referenced AI->from values to use the | |
150 | loop-closed AI->to, if the references are dominated by AI->bb and | |
151 | not by the definition of AI->from. */ | |
152 | ||
153 | static void | |
154 | adjust_debug_stmts_now (adjust_info *ai) | |
155 | { | |
156 | basic_block bbphi = ai->bb; | |
157 | tree orig_def = ai->from; | |
158 | tree new_def = ai->to; | |
159 | imm_use_iterator imm_iter; | |
355fe088 | 160 | gimple *stmt; |
684f25f4 AO |
161 | basic_block bbdef = gimple_bb (SSA_NAME_DEF_STMT (orig_def)); |
162 | ||
163 | gcc_assert (dom_info_available_p (CDI_DOMINATORS)); | |
164 | ||
165 | /* Adjust any debug stmts that held onto non-loop-closed | |
166 | references. */ | |
167 | FOR_EACH_IMM_USE_STMT (stmt, imm_iter, orig_def) | |
168 | { | |
169 | use_operand_p use_p; | |
170 | basic_block bbuse; | |
171 | ||
172 | if (!is_gimple_debug (stmt)) | |
173 | continue; | |
174 | ||
175 | gcc_assert (gimple_debug_bind_p (stmt)); | |
176 | ||
177 | bbuse = gimple_bb (stmt); | |
178 | ||
179 | if ((bbuse == bbphi | |
180 | || dominated_by_p (CDI_DOMINATORS, bbuse, bbphi)) | |
181 | && !(bbuse == bbdef | |
182 | || dominated_by_p (CDI_DOMINATORS, bbuse, bbdef))) | |
183 | { | |
184 | if (new_def) | |
185 | FOR_EACH_IMM_USE_ON_STMT (use_p, imm_iter) | |
186 | SET_USE (use_p, new_def); | |
187 | else | |
188 | { | |
189 | gimple_debug_bind_reset_value (stmt); | |
190 | update_stmt (stmt); | |
191 | } | |
192 | } | |
193 | } | |
194 | } | |
195 | ||
196 | /* Adjust debug stmts as scheduled before. */ | |
197 | ||
198 | static void | |
199 | adjust_vec_debug_stmts (void) | |
200 | { | |
36f52e8f | 201 | if (!MAY_HAVE_DEBUG_BIND_STMTS) |
684f25f4 AO |
202 | return; |
203 | ||
9771b263 | 204 | gcc_assert (adjust_vec.exists ()); |
684f25f4 | 205 | |
9771b263 | 206 | while (!adjust_vec.is_empty ()) |
684f25f4 | 207 | { |
9771b263 DN |
208 | adjust_debug_stmts_now (&adjust_vec.last ()); |
209 | adjust_vec.pop (); | |
684f25f4 | 210 | } |
684f25f4 AO |
211 | } |
212 | ||
213 | /* Adjust any debug stmts that referenced FROM values to use the | |
214 | loop-closed TO, if the references are dominated by BB and not by | |
215 | the definition of FROM. If adjust_vec is non-NULL, adjustments | |
216 | will be postponed until adjust_vec_debug_stmts is called. */ | |
217 | ||
218 | static void | |
219 | adjust_debug_stmts (tree from, tree to, basic_block bb) | |
220 | { | |
221 | adjust_info ai; | |
222 | ||
36f52e8f | 223 | if (MAY_HAVE_DEBUG_BIND_STMTS |
a471762f | 224 | && TREE_CODE (from) == SSA_NAME |
a52ca739 | 225 | && ! SSA_NAME_IS_DEFAULT_DEF (from) |
a471762f | 226 | && ! virtual_operand_p (from)) |
684f25f4 AO |
227 | { |
228 | ai.from = from; | |
229 | ai.to = to; | |
230 | ai.bb = bb; | |
231 | ||
9771b263 DN |
232 | if (adjust_vec.exists ()) |
233 | adjust_vec.safe_push (ai); | |
684f25f4 AO |
234 | else |
235 | adjust_debug_stmts_now (&ai); | |
236 | } | |
237 | } | |
238 | ||
239 | /* Change E's phi arg in UPDATE_PHI to NEW_DEF, and record information | |
240 | to adjust any debug stmts that referenced the old phi arg, | |
241 | presumably non-loop-closed references left over from other | |
242 | transformations. */ | |
243 | ||
244 | static void | |
355fe088 | 245 | adjust_phi_and_debug_stmts (gimple *update_phi, edge e, tree new_def) |
684f25f4 AO |
246 | { |
247 | tree orig_def = PHI_ARG_DEF_FROM_EDGE (update_phi, e); | |
248 | ||
249 | SET_PHI_ARG_DEF (update_phi, e->dest_idx, new_def); | |
250 | ||
36f52e8f | 251 | if (MAY_HAVE_DEBUG_BIND_STMTS) |
684f25f4 AO |
252 | adjust_debug_stmts (orig_def, PHI_RESULT (update_phi), |
253 | gimple_bb (update_phi)); | |
254 | } | |
255 | ||
7cfb4d93 RS |
256 | /* Define one loop mask MASK from loop LOOP. INIT_MASK is the value that |
257 | the mask should have during the first iteration and NEXT_MASK is the | |
258 | value that it should have on subsequent iterations. */ | |
0f26839a | 259 | |
7cfb4d93 RS |
260 | static void |
261 | vect_set_loop_mask (struct loop *loop, tree mask, tree init_mask, | |
262 | tree next_mask) | |
263 | { | |
264 | gphi *phi = create_phi_node (mask, loop->header); | |
265 | add_phi_arg (phi, init_mask, loop_preheader_edge (loop), UNKNOWN_LOCATION); | |
266 | add_phi_arg (phi, next_mask, loop_latch_edge (loop), UNKNOWN_LOCATION); | |
267 | } | |
0f26839a | 268 | |
7cfb4d93 | 269 | /* Add SEQ to the end of LOOP's preheader block. */ |
ebfd146a | 270 | |
7cfb4d93 RS |
271 | static void |
272 | add_preheader_seq (struct loop *loop, gimple_seq seq) | |
273 | { | |
274 | if (seq) | |
275 | { | |
276 | edge pe = loop_preheader_edge (loop); | |
277 | basic_block new_bb = gsi_insert_seq_on_edge_immediate (pe, seq); | |
278 | gcc_assert (!new_bb); | |
279 | } | |
280 | } | |
ebfd146a | 281 | |
7cfb4d93 RS |
282 | /* Add SEQ to the beginning of LOOP's header block. */ |
283 | ||
284 | static void | |
285 | add_header_seq (struct loop *loop, gimple_seq seq) | |
286 | { | |
287 | if (seq) | |
288 | { | |
289 | gimple_stmt_iterator gsi = gsi_after_labels (loop->header); | |
290 | gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT); | |
291 | } | |
292 | } | |
293 | ||
294 | /* Return true if the target can interleave elements of two vectors. | |
295 | OFFSET is 0 if the first half of the vectors should be interleaved | |
296 | or 1 if the second half should. When returning true, store the | |
297 | associated permutation in INDICES. */ | |
298 | ||
299 | static bool | |
300 | interleave_supported_p (vec_perm_indices *indices, tree vectype, | |
301 | unsigned int offset) | |
302 | { | |
303 | poly_uint64 nelts = TYPE_VECTOR_SUBPARTS (vectype); | |
304 | poly_uint64 base = exact_div (nelts, 2) * offset; | |
305 | vec_perm_builder sel (nelts, 2, 3); | |
306 | for (unsigned int i = 0; i < 3; ++i) | |
307 | { | |
308 | sel.quick_push (base + i); | |
309 | sel.quick_push (base + i + nelts); | |
310 | } | |
311 | indices->new_vector (sel, 2, nelts); | |
312 | return can_vec_perm_const_p (TYPE_MODE (vectype), *indices); | |
313 | } | |
314 | ||
315 | /* Try to use permutes to define the masks in DEST_RGM using the masks | |
316 | in SRC_RGM, given that the former has twice as many masks as the | |
317 | latter. Return true on success, adding any new statements to SEQ. */ | |
318 | ||
319 | static bool | |
320 | vect_maybe_permute_loop_masks (gimple_seq *seq, rgroup_masks *dest_rgm, | |
321 | rgroup_masks *src_rgm) | |
322 | { | |
323 | tree src_masktype = src_rgm->mask_type; | |
324 | tree dest_masktype = dest_rgm->mask_type; | |
325 | machine_mode src_mode = TYPE_MODE (src_masktype); | |
326 | if (dest_rgm->max_nscalars_per_iter <= src_rgm->max_nscalars_per_iter | |
327 | && optab_handler (vec_unpacku_hi_optab, src_mode) != CODE_FOR_nothing | |
328 | && optab_handler (vec_unpacku_lo_optab, src_mode) != CODE_FOR_nothing) | |
329 | { | |
330 | /* Unpacking the source masks gives at least as many mask bits as | |
331 | we need. We can then VIEW_CONVERT any excess bits away. */ | |
332 | tree unpack_masktype = vect_halve_mask_nunits (src_masktype); | |
333 | for (unsigned int i = 0; i < dest_rgm->masks.length (); ++i) | |
334 | { | |
335 | tree src = src_rgm->masks[i / 2]; | |
336 | tree dest = dest_rgm->masks[i]; | |
337 | tree_code code = (i & 1 ? VEC_UNPACK_HI_EXPR | |
338 | : VEC_UNPACK_LO_EXPR); | |
339 | gassign *stmt; | |
340 | if (dest_masktype == unpack_masktype) | |
341 | stmt = gimple_build_assign (dest, code, src); | |
342 | else | |
343 | { | |
344 | tree temp = make_ssa_name (unpack_masktype); | |
345 | stmt = gimple_build_assign (temp, code, src); | |
346 | gimple_seq_add_stmt (seq, stmt); | |
347 | stmt = gimple_build_assign (dest, VIEW_CONVERT_EXPR, | |
348 | build1 (VIEW_CONVERT_EXPR, | |
349 | dest_masktype, temp)); | |
350 | } | |
351 | gimple_seq_add_stmt (seq, stmt); | |
352 | } | |
353 | return true; | |
354 | } | |
355 | vec_perm_indices indices[2]; | |
356 | if (dest_masktype == src_masktype | |
357 | && interleave_supported_p (&indices[0], src_masktype, 0) | |
358 | && interleave_supported_p (&indices[1], src_masktype, 1)) | |
359 | { | |
360 | /* The destination requires twice as many mask bits as the source, so | |
361 | we can use interleaving permutes to double up the number of bits. */ | |
362 | tree masks[2]; | |
363 | for (unsigned int i = 0; i < 2; ++i) | |
364 | masks[i] = vect_gen_perm_mask_checked (src_masktype, indices[i]); | |
365 | for (unsigned int i = 0; i < dest_rgm->masks.length (); ++i) | |
366 | { | |
367 | tree src = src_rgm->masks[i / 2]; | |
368 | tree dest = dest_rgm->masks[i]; | |
369 | gimple *stmt = gimple_build_assign (dest, VEC_PERM_EXPR, | |
370 | src, src, masks[i & 1]); | |
371 | gimple_seq_add_stmt (seq, stmt); | |
372 | } | |
373 | return true; | |
374 | } | |
375 | return false; | |
376 | } | |
377 | ||
378 | /* Helper for vect_set_loop_condition_masked. Generate definitions for | |
379 | all the masks in RGM and return a mask that is nonzero when the loop | |
380 | needs to iterate. Add any new preheader statements to PREHEADER_SEQ. | |
381 | Use LOOP_COND_GSI to insert code before the exit gcond. | |
382 | ||
383 | RGM belongs to loop LOOP. The loop originally iterated NITERS | |
384 | times and has been vectorized according to LOOP_VINFO. Each iteration | |
385 | of the vectorized loop handles VF iterations of the scalar loop. | |
386 | ||
535e7c11 RS |
387 | If NITERS_SKIP is nonnull, the first iteration of the vectorized loop |
388 | starts with NITERS_SKIP dummy iterations of the scalar loop before | |
389 | the real work starts. The mask elements for these dummy iterations | |
390 | must be 0, to ensure that the extra iterations do not have an effect. | |
391 | ||
7cfb4d93 RS |
392 | It is known that: |
393 | ||
394 | NITERS * RGM->max_nscalars_per_iter | |
395 | ||
396 | does not overflow. However, MIGHT_WRAP_P says whether an induction | |
397 | variable that starts at 0 and has step: | |
398 | ||
399 | VF * RGM->max_nscalars_per_iter | |
400 | ||
401 | might overflow before hitting a value above: | |
402 | ||
535e7c11 | 403 | (NITERS + NITERS_SKIP) * RGM->max_nscalars_per_iter |
7cfb4d93 RS |
404 | |
405 | This means that we cannot guarantee that such an induction variable | |
406 | would ever hit a value that produces a set of all-false masks for RGM. */ | |
407 | ||
408 | static tree | |
409 | vect_set_loop_masks_directly (struct loop *loop, loop_vec_info loop_vinfo, | |
410 | gimple_seq *preheader_seq, | |
411 | gimple_stmt_iterator loop_cond_gsi, | |
412 | rgroup_masks *rgm, tree vf, | |
535e7c11 RS |
413 | tree niters, tree niters_skip, |
414 | bool might_wrap_p) | |
7cfb4d93 RS |
415 | { |
416 | tree compare_type = LOOP_VINFO_MASK_COMPARE_TYPE (loop_vinfo); | |
417 | tree mask_type = rgm->mask_type; | |
418 | unsigned int nscalars_per_iter = rgm->max_nscalars_per_iter; | |
419 | poly_uint64 nscalars_per_mask = TYPE_VECTOR_SUBPARTS (mask_type); | |
420 | ||
421 | /* Calculate the maximum number of scalar values that the rgroup | |
535e7c11 RS |
422 | handles in total, the number that it handles for each iteration |
423 | of the vector loop, and the number that it should skip during the | |
424 | first iteration of the vector loop. */ | |
7cfb4d93 RS |
425 | tree nscalars_total = niters; |
426 | tree nscalars_step = vf; | |
535e7c11 | 427 | tree nscalars_skip = niters_skip; |
7cfb4d93 RS |
428 | if (nscalars_per_iter != 1) |
429 | { | |
430 | /* We checked before choosing to use a fully-masked loop that these | |
431 | multiplications don't overflow. */ | |
432 | tree factor = build_int_cst (compare_type, nscalars_per_iter); | |
433 | nscalars_total = gimple_build (preheader_seq, MULT_EXPR, compare_type, | |
434 | nscalars_total, factor); | |
435 | nscalars_step = gimple_build (preheader_seq, MULT_EXPR, compare_type, | |
436 | nscalars_step, factor); | |
535e7c11 RS |
437 | if (nscalars_skip) |
438 | nscalars_skip = gimple_build (preheader_seq, MULT_EXPR, compare_type, | |
439 | nscalars_skip, factor); | |
7cfb4d93 RS |
440 | } |
441 | ||
442 | /* Create an induction variable that counts the number of scalars | |
443 | processed. */ | |
444 | tree index_before_incr, index_after_incr; | |
445 | gimple_stmt_iterator incr_gsi; | |
446 | bool insert_after; | |
447 | tree zero_index = build_int_cst (compare_type, 0); | |
448 | standard_iv_increment_position (loop, &incr_gsi, &insert_after); | |
449 | create_iv (zero_index, nscalars_step, NULL_TREE, loop, &incr_gsi, | |
450 | insert_after, &index_before_incr, &index_after_incr); | |
451 | ||
535e7c11 | 452 | tree test_index, test_limit, first_limit; |
7cfb4d93 RS |
453 | gimple_stmt_iterator *test_gsi; |
454 | if (might_wrap_p) | |
455 | { | |
456 | /* In principle the loop should stop iterating once the incremented | |
535e7c11 RS |
457 | IV reaches a value greater than or equal to: |
458 | ||
459 | NSCALARS_TOTAL +[infinite-prec] NSCALARS_SKIP | |
460 | ||
461 | However, there's no guarantee that this addition doesn't overflow | |
462 | the comparison type, or that the IV hits a value above it before | |
463 | wrapping around. We therefore adjust the limit down by one | |
464 | IV step: | |
7cfb4d93 | 465 | |
535e7c11 RS |
466 | (NSCALARS_TOTAL +[infinite-prec] NSCALARS_SKIP) |
467 | -[infinite-prec] NSCALARS_STEP | |
7cfb4d93 RS |
468 | |
469 | and compare the IV against this limit _before_ incrementing it. | |
470 | Since the comparison type is unsigned, we actually want the | |
471 | subtraction to saturate at zero: | |
472 | ||
535e7c11 RS |
473 | (NSCALARS_TOTAL +[infinite-prec] NSCALARS_SKIP) |
474 | -[sat] NSCALARS_STEP | |
475 | ||
476 | And since NSCALARS_SKIP < NSCALARS_STEP, we can reassociate this as: | |
477 | ||
478 | NSCALARS_TOTAL -[sat] (NSCALARS_STEP - NSCALARS_SKIP) | |
479 | ||
480 | where the rightmost subtraction can be done directly in | |
481 | COMPARE_TYPE. */ | |
7cfb4d93 | 482 | test_index = index_before_incr; |
535e7c11 RS |
483 | tree adjust = nscalars_step; |
484 | if (nscalars_skip) | |
485 | adjust = gimple_build (preheader_seq, MINUS_EXPR, compare_type, | |
486 | adjust, nscalars_skip); | |
7cfb4d93 | 487 | test_limit = gimple_build (preheader_seq, MAX_EXPR, compare_type, |
535e7c11 | 488 | nscalars_total, adjust); |
7cfb4d93 | 489 | test_limit = gimple_build (preheader_seq, MINUS_EXPR, compare_type, |
535e7c11 | 490 | test_limit, adjust); |
7cfb4d93 | 491 | test_gsi = &incr_gsi; |
535e7c11 RS |
492 | |
493 | /* Get a safe limit for the first iteration. */ | |
494 | if (nscalars_skip) | |
495 | { | |
496 | /* The first vector iteration can handle at most NSCALARS_STEP | |
497 | scalars. NSCALARS_STEP <= CONST_LIMIT, and adding | |
498 | NSCALARS_SKIP to that cannot overflow. */ | |
499 | tree const_limit = build_int_cst (compare_type, | |
500 | LOOP_VINFO_VECT_FACTOR (loop_vinfo) | |
501 | * nscalars_per_iter); | |
502 | first_limit = gimple_build (preheader_seq, MIN_EXPR, compare_type, | |
503 | nscalars_total, const_limit); | |
504 | first_limit = gimple_build (preheader_seq, PLUS_EXPR, compare_type, | |
505 | first_limit, nscalars_skip); | |
506 | } | |
507 | else | |
508 | /* For the first iteration it doesn't matter whether the IV hits | |
509 | a value above NSCALARS_TOTAL. That only matters for the latch | |
510 | condition. */ | |
511 | first_limit = nscalars_total; | |
7cfb4d93 RS |
512 | } |
513 | else | |
514 | { | |
515 | /* Test the incremented IV, which will always hit a value above | |
516 | the bound before wrapping. */ | |
517 | test_index = index_after_incr; | |
518 | test_limit = nscalars_total; | |
535e7c11 RS |
519 | if (nscalars_skip) |
520 | test_limit = gimple_build (preheader_seq, PLUS_EXPR, compare_type, | |
521 | test_limit, nscalars_skip); | |
7cfb4d93 | 522 | test_gsi = &loop_cond_gsi; |
535e7c11 RS |
523 | |
524 | first_limit = test_limit; | |
7cfb4d93 RS |
525 | } |
526 | ||
527 | /* Provide a definition of each mask in the group. */ | |
528 | tree next_mask = NULL_TREE; | |
529 | tree mask; | |
530 | unsigned int i; | |
531 | FOR_EACH_VEC_ELT_REVERSE (rgm->masks, i, mask) | |
532 | { | |
533 | /* Previous masks will cover BIAS scalars. This mask covers the | |
534 | next batch. */ | |
535 | poly_uint64 bias = nscalars_per_mask * i; | |
536 | tree bias_tree = build_int_cst (compare_type, bias); | |
537 | gimple *tmp_stmt; | |
538 | ||
539 | /* See whether the first iteration of the vector loop is known | |
540 | to have a full mask. */ | |
541 | poly_uint64 const_limit; | |
542 | bool first_iteration_full | |
535e7c11 | 543 | = (poly_int_tree_p (first_limit, &const_limit) |
7cfb4d93 RS |
544 | && known_ge (const_limit, (i + 1) * nscalars_per_mask)); |
545 | ||
546 | /* Rather than have a new IV that starts at BIAS and goes up to | |
547 | TEST_LIMIT, prefer to use the same 0-based IV for each mask | |
548 | and adjust the bound down by BIAS. */ | |
549 | tree this_test_limit = test_limit; | |
550 | if (i != 0) | |
551 | { | |
552 | this_test_limit = gimple_build (preheader_seq, MAX_EXPR, | |
553 | compare_type, this_test_limit, | |
554 | bias_tree); | |
555 | this_test_limit = gimple_build (preheader_seq, MINUS_EXPR, | |
556 | compare_type, this_test_limit, | |
557 | bias_tree); | |
558 | } | |
559 | ||
535e7c11 RS |
560 | /* Create the initial mask. First include all scalars that |
561 | are within the loop limit. */ | |
7cfb4d93 RS |
562 | tree init_mask = NULL_TREE; |
563 | if (!first_iteration_full) | |
564 | { | |
565 | tree start, end; | |
535e7c11 | 566 | if (first_limit == test_limit) |
7cfb4d93 RS |
567 | { |
568 | /* Use a natural test between zero (the initial IV value) | |
569 | and the loop limit. The "else" block would be valid too, | |
570 | but this choice can avoid the need to load BIAS_TREE into | |
571 | a register. */ | |
572 | start = zero_index; | |
573 | end = this_test_limit; | |
574 | } | |
575 | else | |
576 | { | |
535e7c11 RS |
577 | /* FIRST_LIMIT is the maximum number of scalars handled by the |
578 | first iteration of the vector loop. Test the portion | |
579 | associated with this mask. */ | |
7cfb4d93 | 580 | start = bias_tree; |
535e7c11 | 581 | end = first_limit; |
7cfb4d93 RS |
582 | } |
583 | ||
584 | init_mask = make_temp_ssa_name (mask_type, NULL, "max_mask"); | |
585 | tmp_stmt = vect_gen_while (init_mask, start, end); | |
586 | gimple_seq_add_stmt (preheader_seq, tmp_stmt); | |
587 | } | |
588 | ||
535e7c11 RS |
589 | /* Now AND out the bits that are within the number of skipped |
590 | scalars. */ | |
591 | poly_uint64 const_skip; | |
592 | if (nscalars_skip | |
593 | && !(poly_int_tree_p (nscalars_skip, &const_skip) | |
594 | && known_le (const_skip, bias))) | |
595 | { | |
596 | tree unskipped_mask = vect_gen_while_not (preheader_seq, mask_type, | |
597 | bias_tree, nscalars_skip); | |
598 | if (init_mask) | |
599 | init_mask = gimple_build (preheader_seq, BIT_AND_EXPR, mask_type, | |
600 | init_mask, unskipped_mask); | |
601 | else | |
602 | init_mask = unskipped_mask; | |
603 | } | |
604 | ||
7cfb4d93 RS |
605 | if (!init_mask) |
606 | /* First iteration is full. */ | |
607 | init_mask = build_minus_one_cst (mask_type); | |
608 | ||
609 | /* Get the mask value for the next iteration of the loop. */ | |
610 | next_mask = make_temp_ssa_name (mask_type, NULL, "next_mask"); | |
611 | gcall *call = vect_gen_while (next_mask, test_index, this_test_limit); | |
612 | gsi_insert_before (test_gsi, call, GSI_SAME_STMT); | |
613 | ||
614 | vect_set_loop_mask (loop, mask, init_mask, next_mask); | |
615 | } | |
616 | return next_mask; | |
617 | } | |
618 | ||
619 | /* Make LOOP iterate NITERS times using masking and WHILE_ULT calls. | |
620 | LOOP_VINFO describes the vectorization of LOOP. NITERS is the | |
621 | number of iterations of the original scalar loop. NITERS_MAYBE_ZERO | |
622 | and FINAL_IV are as for vect_set_loop_condition. | |
623 | ||
624 | Insert the branch-back condition before LOOP_COND_GSI and return the | |
625 | final gcond. */ | |
626 | ||
627 | static gcond * | |
628 | vect_set_loop_condition_masked (struct loop *loop, loop_vec_info loop_vinfo, | |
629 | tree niters, tree final_iv, | |
630 | bool niters_maybe_zero, | |
631 | gimple_stmt_iterator loop_cond_gsi) | |
632 | { | |
633 | gimple_seq preheader_seq = NULL; | |
634 | gimple_seq header_seq = NULL; | |
635 | ||
636 | tree compare_type = LOOP_VINFO_MASK_COMPARE_TYPE (loop_vinfo); | |
637 | unsigned int compare_precision = TYPE_PRECISION (compare_type); | |
638 | unsigned HOST_WIDE_INT max_vf = vect_max_vf (loop_vinfo); | |
639 | tree orig_niters = niters; | |
640 | ||
641 | /* Type of the initial value of NITERS. */ | |
642 | tree ni_actual_type = TREE_TYPE (niters); | |
643 | unsigned int ni_actual_precision = TYPE_PRECISION (ni_actual_type); | |
644 | ||
645 | /* Convert NITERS to the same size as the compare. */ | |
646 | if (compare_precision > ni_actual_precision | |
647 | && niters_maybe_zero) | |
648 | { | |
649 | /* We know that there is always at least one iteration, so if the | |
650 | count is zero then it must have wrapped. Cope with this by | |
651 | subtracting 1 before the conversion and adding 1 to the result. */ | |
652 | gcc_assert (TYPE_UNSIGNED (ni_actual_type)); | |
653 | niters = gimple_build (&preheader_seq, PLUS_EXPR, ni_actual_type, | |
654 | niters, build_minus_one_cst (ni_actual_type)); | |
655 | niters = gimple_convert (&preheader_seq, compare_type, niters); | |
656 | niters = gimple_build (&preheader_seq, PLUS_EXPR, compare_type, | |
657 | niters, build_one_cst (compare_type)); | |
658 | } | |
659 | else | |
660 | niters = gimple_convert (&preheader_seq, compare_type, niters); | |
661 | ||
535e7c11 RS |
662 | /* Convert skip_niters to the right type. */ |
663 | tree niters_skip = LOOP_VINFO_MASK_SKIP_NITERS (loop_vinfo); | |
664 | ||
7cfb4d93 RS |
665 | /* Now calculate the value that the induction variable must be able |
666 | to hit in order to ensure that we end the loop with an all-false mask. | |
667 | This involves adding the maximum number of inactive trailing scalar | |
668 | iterations. */ | |
669 | widest_int iv_limit; | |
670 | bool known_max_iters = max_loop_iterations (loop, &iv_limit); | |
671 | if (known_max_iters) | |
672 | { | |
535e7c11 RS |
673 | if (niters_skip) |
674 | { | |
675 | /* Add the maximum number of skipped iterations to the | |
676 | maximum iteration count. */ | |
677 | if (TREE_CODE (niters_skip) == INTEGER_CST) | |
678 | iv_limit += wi::to_widest (niters_skip); | |
679 | else | |
680 | iv_limit += max_vf - 1; | |
681 | } | |
7cfb4d93 RS |
682 | /* IV_LIMIT is the maximum number of latch iterations, which is also |
683 | the maximum in-range IV value. Round this value down to the previous | |
684 | vector alignment boundary and then add an extra full iteration. */ | |
685 | poly_uint64 vf = LOOP_VINFO_VECT_FACTOR (loop_vinfo); | |
686 | iv_limit = (iv_limit & -(int) known_alignment (vf)) + max_vf; | |
687 | } | |
688 | ||
689 | /* Get the vectorization factor in tree form. */ | |
690 | tree vf = build_int_cst (compare_type, | |
691 | LOOP_VINFO_VECT_FACTOR (loop_vinfo)); | |
692 | ||
693 | /* Iterate over all the rgroups and fill in their masks. We could use | |
694 | the first mask from any rgroup for the loop condition; here we | |
695 | arbitrarily pick the last. */ | |
696 | tree test_mask = NULL_TREE; | |
697 | rgroup_masks *rgm; | |
698 | unsigned int i; | |
699 | vec_loop_masks *masks = &LOOP_VINFO_MASKS (loop_vinfo); | |
700 | FOR_EACH_VEC_ELT (*masks, i, rgm) | |
701 | if (!rgm->masks.is_empty ()) | |
702 | { | |
703 | /* First try using permutes. This adds a single vector | |
704 | instruction to the loop for each mask, but needs no extra | |
705 | loop invariants or IVs. */ | |
706 | unsigned int nmasks = i + 1; | |
707 | if ((nmasks & 1) == 0) | |
708 | { | |
709 | rgroup_masks *half_rgm = &(*masks)[nmasks / 2 - 1]; | |
710 | if (!half_rgm->masks.is_empty () | |
711 | && vect_maybe_permute_loop_masks (&header_seq, rgm, half_rgm)) | |
712 | continue; | |
713 | } | |
714 | ||
715 | /* See whether zero-based IV would ever generate all-false masks | |
716 | before wrapping around. */ | |
717 | bool might_wrap_p | |
718 | = (!known_max_iters | |
719 | || (wi::min_precision (iv_limit * rgm->max_nscalars_per_iter, | |
720 | UNSIGNED) | |
721 | > compare_precision)); | |
722 | ||
723 | /* Set up all masks for this group. */ | |
724 | test_mask = vect_set_loop_masks_directly (loop, loop_vinfo, | |
725 | &preheader_seq, | |
726 | loop_cond_gsi, rgm, vf, | |
535e7c11 RS |
727 | niters, niters_skip, |
728 | might_wrap_p); | |
7cfb4d93 RS |
729 | } |
730 | ||
731 | /* Emit all accumulated statements. */ | |
732 | add_preheader_seq (loop, preheader_seq); | |
733 | add_header_seq (loop, header_seq); | |
734 | ||
735 | /* Get a boolean result that tells us whether to iterate. */ | |
736 | edge exit_edge = single_exit (loop); | |
737 | tree_code code = (exit_edge->flags & EDGE_TRUE_VALUE) ? EQ_EXPR : NE_EXPR; | |
738 | tree zero_mask = build_zero_cst (TREE_TYPE (test_mask)); | |
739 | gcond *cond_stmt = gimple_build_cond (code, test_mask, zero_mask, | |
740 | NULL_TREE, NULL_TREE); | |
741 | gsi_insert_before (&loop_cond_gsi, cond_stmt, GSI_SAME_STMT); | |
742 | ||
743 | /* The loop iterates (NITERS - 1) / VF + 1 times. | |
744 | Subtract one from this to get the latch count. */ | |
745 | tree step = build_int_cst (compare_type, | |
746 | LOOP_VINFO_VECT_FACTOR (loop_vinfo)); | |
747 | tree niters_minus_one = fold_build2 (PLUS_EXPR, compare_type, niters, | |
748 | build_minus_one_cst (compare_type)); | |
749 | loop->nb_iterations = fold_build2 (TRUNC_DIV_EXPR, compare_type, | |
750 | niters_minus_one, step); | |
751 | ||
752 | if (final_iv) | |
753 | { | |
754 | gassign *assign = gimple_build_assign (final_iv, orig_niters); | |
755 | gsi_insert_on_edge_immediate (single_exit (loop), assign); | |
756 | } | |
757 | ||
758 | return cond_stmt; | |
759 | } | |
760 | ||
761 | /* Like vect_set_loop_condition, but handle the case in which there | |
762 | are no loop masks. */ | |
763 | ||
764 | static gcond * | |
765 | vect_set_loop_condition_unmasked (struct loop *loop, tree niters, | |
766 | tree step, tree final_iv, | |
767 | bool niters_maybe_zero, | |
768 | gimple_stmt_iterator loop_cond_gsi) | |
ebfd146a IR |
769 | { |
770 | tree indx_before_incr, indx_after_incr; | |
538dd0b7 DM |
771 | gcond *cond_stmt; |
772 | gcond *orig_cond; | |
0f26839a | 773 | edge pe = loop_preheader_edge (loop); |
ebfd146a | 774 | edge exit_edge = single_exit (loop); |
ebfd146a IR |
775 | gimple_stmt_iterator incr_gsi; |
776 | bool insert_after; | |
ebfd146a | 777 | enum tree_code code; |
0f26839a | 778 | tree niters_type = TREE_TYPE (niters); |
ebfd146a IR |
779 | |
780 | orig_cond = get_loop_exit_condition (loop); | |
781 | gcc_assert (orig_cond); | |
782 | loop_cond_gsi = gsi_for_stmt (orig_cond); | |
783 | ||
0f26839a RS |
784 | tree init, limit; |
785 | if (!niters_maybe_zero && integer_onep (step)) | |
786 | { | |
787 | /* In this case we can use a simple 0-based IV: | |
788 | ||
789 | A: | |
790 | x = 0; | |
791 | do | |
792 | { | |
793 | ... | |
794 | x += 1; | |
795 | } | |
796 | while (x < NITERS); */ | |
797 | code = (exit_edge->flags & EDGE_TRUE_VALUE) ? GE_EXPR : LT_EXPR; | |
798 | init = build_zero_cst (niters_type); | |
799 | limit = niters; | |
800 | } | |
801 | else | |
802 | { | |
803 | /* The following works for all values of NITERS except 0: | |
804 | ||
805 | B: | |
806 | x = 0; | |
807 | do | |
808 | { | |
809 | ... | |
810 | x += STEP; | |
811 | } | |
812 | while (x <= NITERS - STEP); | |
813 | ||
814 | so that the loop continues to iterate if x + STEP - 1 < NITERS | |
815 | but stops if x + STEP - 1 >= NITERS. | |
816 | ||
817 | However, if NITERS is zero, x never hits a value above NITERS - STEP | |
818 | before wrapping around. There are two obvious ways of dealing with | |
819 | this: | |
820 | ||
821 | - start at STEP - 1 and compare x before incrementing it | |
822 | - start at -1 and compare x after incrementing it | |
823 | ||
824 | The latter is simpler and is what we use. The loop in this case | |
825 | looks like: | |
826 | ||
827 | C: | |
828 | x = -1; | |
829 | do | |
830 | { | |
831 | ... | |
832 | x += STEP; | |
833 | } | |
834 | while (x < NITERS - STEP); | |
835 | ||
836 | In both cases the loop limit is NITERS - STEP. */ | |
837 | gimple_seq seq = NULL; | |
838 | limit = force_gimple_operand (niters, &seq, true, NULL_TREE); | |
839 | limit = gimple_build (&seq, MINUS_EXPR, TREE_TYPE (limit), limit, step); | |
840 | if (seq) | |
841 | { | |
842 | basic_block new_bb = gsi_insert_seq_on_edge_immediate (pe, seq); | |
843 | gcc_assert (!new_bb); | |
844 | } | |
845 | if (niters_maybe_zero) | |
846 | { | |
847 | /* Case C. */ | |
848 | code = (exit_edge->flags & EDGE_TRUE_VALUE) ? GE_EXPR : LT_EXPR; | |
849 | init = build_all_ones_cst (niters_type); | |
850 | } | |
851 | else | |
852 | { | |
853 | /* Case B. */ | |
854 | code = (exit_edge->flags & EDGE_TRUE_VALUE) ? GT_EXPR : LE_EXPR; | |
855 | init = build_zero_cst (niters_type); | |
856 | } | |
857 | } | |
858 | ||
ebfd146a IR |
859 | standard_iv_increment_position (loop, &incr_gsi, &insert_after); |
860 | create_iv (init, step, NULL_TREE, loop, | |
861 | &incr_gsi, insert_after, &indx_before_incr, &indx_after_incr); | |
ebfd146a IR |
862 | indx_after_incr = force_gimple_operand_gsi (&loop_cond_gsi, indx_after_incr, |
863 | true, NULL_TREE, true, | |
864 | GSI_SAME_STMT); | |
0f26839a | 865 | limit = force_gimple_operand_gsi (&loop_cond_gsi, limit, true, NULL_TREE, |
ebfd146a IR |
866 | true, GSI_SAME_STMT); |
867 | ||
0f26839a | 868 | cond_stmt = gimple_build_cond (code, indx_after_incr, limit, NULL_TREE, |
ebfd146a IR |
869 | NULL_TREE); |
870 | ||
871 | gsi_insert_before (&loop_cond_gsi, cond_stmt, GSI_SAME_STMT); | |
872 | ||
71118889 | 873 | /* Record the number of latch iterations. */ |
0f26839a RS |
874 | if (limit == niters) |
875 | /* Case A: the loop iterates NITERS times. Subtract one to get the | |
876 | latch count. */ | |
877 | loop->nb_iterations = fold_build2 (MINUS_EXPR, niters_type, niters, | |
878 | build_int_cst (niters_type, 1)); | |
879 | else | |
880 | /* Case B or C: the loop iterates (NITERS - STEP) / STEP + 1 times. | |
881 | Subtract one from this to get the latch count. */ | |
882 | loop->nb_iterations = fold_build2 (TRUNC_DIV_EXPR, niters_type, | |
883 | limit, step); | |
884 | ||
885 | if (final_iv) | |
886 | { | |
887 | gassign *assign = gimple_build_assign (final_iv, MINUS_EXPR, | |
888 | indx_after_incr, init); | |
889 | gsi_insert_on_edge_immediate (single_exit (loop), assign); | |
890 | } | |
7cfb4d93 RS |
891 | |
892 | return cond_stmt; | |
893 | } | |
894 | ||
895 | /* If we're using fully-masked loops, make LOOP iterate: | |
896 | ||
897 | N == (NITERS - 1) / STEP + 1 | |
898 | ||
899 | times. When NITERS is zero, this is equivalent to making the loop | |
900 | execute (1 << M) / STEP times, where M is the precision of NITERS. | |
901 | NITERS_MAYBE_ZERO is true if this last case might occur. | |
902 | ||
903 | If we're not using fully-masked loops, make LOOP iterate: | |
904 | ||
905 | N == (NITERS - STEP) / STEP + 1 | |
906 | ||
907 | times, where NITERS is known to be outside the range [1, STEP - 1]. | |
908 | This is equivalent to making the loop execute NITERS / STEP times | |
909 | when NITERS is nonzero and (1 << M) / STEP times otherwise. | |
910 | NITERS_MAYBE_ZERO again indicates whether this last case might occur. | |
911 | ||
912 | If FINAL_IV is nonnull, it is an SSA name that should be set to | |
913 | N * STEP on exit from the loop. | |
914 | ||
915 | Assumption: the exit-condition of LOOP is the last stmt in the loop. */ | |
916 | ||
917 | void | |
918 | vect_set_loop_condition (struct loop *loop, loop_vec_info loop_vinfo, | |
919 | tree niters, tree step, tree final_iv, | |
920 | bool niters_maybe_zero) | |
921 | { | |
922 | gcond *cond_stmt; | |
923 | gcond *orig_cond = get_loop_exit_condition (loop); | |
924 | gimple_stmt_iterator loop_cond_gsi = gsi_for_stmt (orig_cond); | |
925 | ||
926 | if (loop_vinfo && LOOP_VINFO_FULLY_MASKED_P (loop_vinfo)) | |
927 | cond_stmt = vect_set_loop_condition_masked (loop, loop_vinfo, niters, | |
928 | final_iv, niters_maybe_zero, | |
929 | loop_cond_gsi); | |
930 | else | |
931 | cond_stmt = vect_set_loop_condition_unmasked (loop, niters, step, | |
932 | final_iv, niters_maybe_zero, | |
933 | loop_cond_gsi); | |
934 | ||
935 | /* Remove old loop exit test. */ | |
936 | gsi_remove (&loop_cond_gsi, true); | |
937 | free_stmt_vec_info (orig_cond); | |
938 | ||
939 | if (dump_enabled_p ()) | |
940 | { | |
941 | dump_printf_loc (MSG_NOTE, vect_location, "New loop exit condition: "); | |
942 | dump_gimple_stmt (MSG_NOTE, TDF_SLIM, cond_stmt, 0); | |
943 | } | |
ebfd146a IR |
944 | } |
945 | ||
5ce9450f JJ |
946 | /* Helper routine of slpeel_tree_duplicate_loop_to_edge_cfg. |
947 | For all PHI arguments in FROM->dest and TO->dest from those | |
948 | edges ensure that TO->dest PHI arguments have current_def | |
949 | to that in from. */ | |
950 | ||
951 | static void | |
952 | slpeel_duplicate_current_defs_from_edges (edge from, edge to) | |
953 | { | |
954 | gimple_stmt_iterator gsi_from, gsi_to; | |
955 | ||
956 | for (gsi_from = gsi_start_phis (from->dest), | |
957 | gsi_to = gsi_start_phis (to->dest); | |
14ba8d6d | 958 | !gsi_end_p (gsi_from) && !gsi_end_p (gsi_to);) |
5ce9450f | 959 | { |
355fe088 TS |
960 | gimple *from_phi = gsi_stmt (gsi_from); |
961 | gimple *to_phi = gsi_stmt (gsi_to); | |
5ce9450f | 962 | tree from_arg = PHI_ARG_DEF_FROM_EDGE (from_phi, from); |
1a5da5b6 RB |
963 | tree to_arg = PHI_ARG_DEF_FROM_EDGE (to_phi, to); |
964 | if (virtual_operand_p (from_arg)) | |
965 | { | |
14ba8d6d RB |
966 | gsi_next (&gsi_from); |
967 | continue; | |
968 | } | |
1a5da5b6 RB |
969 | if (virtual_operand_p (to_arg)) |
970 | { | |
14ba8d6d RB |
971 | gsi_next (&gsi_to); |
972 | continue; | |
973 | } | |
1a5da5b6 RB |
974 | if (TREE_CODE (from_arg) != SSA_NAME) |
975 | gcc_assert (operand_equal_p (from_arg, to_arg, 0)); | |
976 | else | |
977 | { | |
978 | if (get_current_def (to_arg) == NULL_TREE) | |
979 | set_current_def (to_arg, get_current_def (from_arg)); | |
980 | } | |
14ba8d6d RB |
981 | gsi_next (&gsi_from); |
982 | gsi_next (&gsi_to); | |
5ce9450f | 983 | } |
1a5da5b6 RB |
984 | |
985 | gphi *from_phi = get_virtual_phi (from->dest); | |
986 | gphi *to_phi = get_virtual_phi (to->dest); | |
987 | if (from_phi) | |
988 | set_current_def (PHI_ARG_DEF_FROM_EDGE (to_phi, to), | |
989 | get_current_def (PHI_ARG_DEF_FROM_EDGE (from_phi, from))); | |
5ce9450f JJ |
990 | } |
991 | ||
ebfd146a | 992 | |
b8698a0f | 993 | /* Given LOOP this function generates a new copy of it and puts it |
5ce9450f JJ |
994 | on E which is either the entry or exit of LOOP. If SCALAR_LOOP is |
995 | non-NULL, assume LOOP and SCALAR_LOOP are equivalent and copy the | |
996 | basic blocks from SCALAR_LOOP instead of LOOP, but to either the | |
997 | entry or exit of LOOP. */ | |
ebfd146a IR |
998 | |
999 | struct loop * | |
5ce9450f JJ |
1000 | slpeel_tree_duplicate_loop_to_edge_cfg (struct loop *loop, |
1001 | struct loop *scalar_loop, edge e) | |
ebfd146a IR |
1002 | { |
1003 | struct loop *new_loop; | |
3884da6f | 1004 | basic_block *new_bbs, *bbs, *pbbs; |
ebfd146a IR |
1005 | bool at_exit; |
1006 | bool was_imm_dom; | |
b8698a0f | 1007 | basic_block exit_dest; |
ebfd146a | 1008 | edge exit, new_exit; |
a6c51a12 | 1009 | bool duplicate_outer_loop = false; |
ebfd146a | 1010 | |
2cfc56b9 RB |
1011 | exit = single_exit (loop); |
1012 | at_exit = (e == exit); | |
ebfd146a IR |
1013 | if (!at_exit && e != loop_preheader_edge (loop)) |
1014 | return NULL; | |
1015 | ||
5ce9450f JJ |
1016 | if (scalar_loop == NULL) |
1017 | scalar_loop = loop; | |
1018 | ||
1019 | bbs = XNEWVEC (basic_block, scalar_loop->num_nodes + 1); | |
3884da6f BC |
1020 | pbbs = bbs + 1; |
1021 | get_loop_body_with_size (scalar_loop, pbbs, scalar_loop->num_nodes); | |
a6c51a12 YR |
1022 | /* Allow duplication of outer loops. */ |
1023 | if (scalar_loop->inner) | |
1024 | duplicate_outer_loop = true; | |
ebfd146a | 1025 | /* Check whether duplication is possible. */ |
3884da6f | 1026 | if (!can_copy_bbs_p (pbbs, scalar_loop->num_nodes)) |
ebfd146a IR |
1027 | { |
1028 | free (bbs); | |
1029 | return NULL; | |
1030 | } | |
1031 | ||
1032 | /* Generate new loop structure. */ | |
5ce9450f JJ |
1033 | new_loop = duplicate_loop (scalar_loop, loop_outer (scalar_loop)); |
1034 | duplicate_subloops (scalar_loop, new_loop); | |
ebfd146a | 1035 | |
2cfc56b9 | 1036 | exit_dest = exit->dest; |
b8698a0f L |
1037 | was_imm_dom = (get_immediate_dominator (CDI_DOMINATORS, |
1038 | exit_dest) == loop->header ? | |
ebfd146a IR |
1039 | true : false); |
1040 | ||
2cfc56b9 RB |
1041 | /* Also copy the pre-header, this avoids jumping through hoops to |
1042 | duplicate the loop entry PHI arguments. Create an empty | |
1043 | pre-header unconditionally for this. */ | |
5ce9450f | 1044 | basic_block preheader = split_edge (loop_preheader_edge (scalar_loop)); |
2cfc56b9 | 1045 | edge entry_e = single_pred_edge (preheader); |
3884da6f | 1046 | bbs[0] = preheader; |
5ce9450f | 1047 | new_bbs = XNEWVEC (basic_block, scalar_loop->num_nodes + 1); |
ebfd146a | 1048 | |
5ce9450f JJ |
1049 | exit = single_exit (scalar_loop); |
1050 | copy_bbs (bbs, scalar_loop->num_nodes + 1, new_bbs, | |
ebfd146a | 1051 | &exit, 1, &new_exit, NULL, |
3884da6f | 1052 | at_exit ? loop->latch : e->src, true); |
5ce9450f | 1053 | exit = single_exit (loop); |
3884da6f | 1054 | basic_block new_preheader = new_bbs[0]; |
ebfd146a | 1055 | |
5ce9450f JJ |
1056 | add_phi_args_after_copy (new_bbs, scalar_loop->num_nodes + 1, NULL); |
1057 | ||
1058 | if (scalar_loop != loop) | |
1059 | { | |
1060 | /* If we copied from SCALAR_LOOP rather than LOOP, SSA_NAMEs from | |
1061 | SCALAR_LOOP will have current_def set to SSA_NAMEs in the new_loop, | |
1062 | but LOOP will not. slpeel_update_phi_nodes_for_guard{1,2} expects | |
1063 | the LOOP SSA_NAMEs (on the exit edge and edge from latch to | |
1064 | header) to have current_def set, so copy them over. */ | |
1065 | slpeel_duplicate_current_defs_from_edges (single_exit (scalar_loop), | |
1066 | exit); | |
1067 | slpeel_duplicate_current_defs_from_edges (EDGE_SUCC (scalar_loop->latch, | |
1068 | 0), | |
1069 | EDGE_SUCC (loop->latch, 0)); | |
1070 | } | |
b8698a0f | 1071 | |
ebfd146a IR |
1072 | if (at_exit) /* Add the loop copy at exit. */ |
1073 | { | |
5ce9450f JJ |
1074 | if (scalar_loop != loop) |
1075 | { | |
538dd0b7 | 1076 | gphi_iterator gsi; |
5ce9450f JJ |
1077 | new_exit = redirect_edge_and_branch (new_exit, exit_dest); |
1078 | ||
1079 | for (gsi = gsi_start_phis (exit_dest); !gsi_end_p (gsi); | |
1080 | gsi_next (&gsi)) | |
1081 | { | |
538dd0b7 | 1082 | gphi *phi = gsi.phi (); |
5ce9450f JJ |
1083 | tree orig_arg = PHI_ARG_DEF_FROM_EDGE (phi, e); |
1084 | location_t orig_locus | |
1085 | = gimple_phi_arg_location_from_edge (phi, e); | |
1086 | ||
1087 | add_phi_arg (phi, orig_arg, new_exit, orig_locus); | |
1088 | } | |
1089 | } | |
2cfc56b9 RB |
1090 | redirect_edge_and_branch_force (e, new_preheader); |
1091 | flush_pending_stmts (e); | |
1092 | set_immediate_dominator (CDI_DOMINATORS, new_preheader, e->src); | |
a6c51a12 | 1093 | if (was_imm_dom || duplicate_outer_loop) |
5ce9450f | 1094 | set_immediate_dominator (CDI_DOMINATORS, exit_dest, new_exit->src); |
2cfc56b9 RB |
1095 | |
1096 | /* And remove the non-necessary forwarder again. Keep the other | |
1097 | one so we have a proper pre-header for the loop at the exit edge. */ | |
5ce9450f JJ |
1098 | redirect_edge_pred (single_succ_edge (preheader), |
1099 | single_pred (preheader)); | |
2cfc56b9 | 1100 | delete_basic_block (preheader); |
5ce9450f JJ |
1101 | set_immediate_dominator (CDI_DOMINATORS, scalar_loop->header, |
1102 | loop_preheader_edge (scalar_loop)->src); | |
ebfd146a IR |
1103 | } |
1104 | else /* Add the copy at entry. */ | |
1105 | { | |
5ce9450f JJ |
1106 | if (scalar_loop != loop) |
1107 | { | |
1108 | /* Remove the non-necessary forwarder of scalar_loop again. */ | |
1109 | redirect_edge_pred (single_succ_edge (preheader), | |
1110 | single_pred (preheader)); | |
1111 | delete_basic_block (preheader); | |
1112 | set_immediate_dominator (CDI_DOMINATORS, scalar_loop->header, | |
1113 | loop_preheader_edge (scalar_loop)->src); | |
1114 | preheader = split_edge (loop_preheader_edge (loop)); | |
1115 | entry_e = single_pred_edge (preheader); | |
1116 | } | |
1117 | ||
2cfc56b9 RB |
1118 | redirect_edge_and_branch_force (entry_e, new_preheader); |
1119 | flush_pending_stmts (entry_e); | |
1120 | set_immediate_dominator (CDI_DOMINATORS, new_preheader, entry_e->src); | |
1121 | ||
1122 | redirect_edge_and_branch_force (new_exit, preheader); | |
1123 | flush_pending_stmts (new_exit); | |
1124 | set_immediate_dominator (CDI_DOMINATORS, preheader, new_exit->src); | |
1125 | ||
1126 | /* And remove the non-necessary forwarder again. Keep the other | |
1127 | one so we have a proper pre-header for the loop at the exit edge. */ | |
5ce9450f JJ |
1128 | redirect_edge_pred (single_succ_edge (new_preheader), |
1129 | single_pred (new_preheader)); | |
2cfc56b9 RB |
1130 | delete_basic_block (new_preheader); |
1131 | set_immediate_dominator (CDI_DOMINATORS, new_loop->header, | |
1132 | loop_preheader_edge (new_loop)->src); | |
ebfd146a IR |
1133 | } |
1134 | ||
166b8799 BC |
1135 | /* Skip new preheader since it's deleted if copy loop is added at entry. */ |
1136 | for (unsigned i = (at_exit ? 0 : 1); i < scalar_loop->num_nodes + 1; i++) | |
a6c51a12 | 1137 | rename_variables_in_bb (new_bbs[i], duplicate_outer_loop); |
2cfc56b9 | 1138 | |
5ce9450f JJ |
1139 | if (scalar_loop != loop) |
1140 | { | |
1141 | /* Update new_loop->header PHIs, so that on the preheader | |
1142 | edge they are the ones from loop rather than scalar_loop. */ | |
538dd0b7 | 1143 | gphi_iterator gsi_orig, gsi_new; |
5ce9450f JJ |
1144 | edge orig_e = loop_preheader_edge (loop); |
1145 | edge new_e = loop_preheader_edge (new_loop); | |
1146 | ||
1147 | for (gsi_orig = gsi_start_phis (loop->header), | |
1148 | gsi_new = gsi_start_phis (new_loop->header); | |
1149 | !gsi_end_p (gsi_orig) && !gsi_end_p (gsi_new); | |
1150 | gsi_next (&gsi_orig), gsi_next (&gsi_new)) | |
1151 | { | |
538dd0b7 DM |
1152 | gphi *orig_phi = gsi_orig.phi (); |
1153 | gphi *new_phi = gsi_new.phi (); | |
5ce9450f JJ |
1154 | tree orig_arg = PHI_ARG_DEF_FROM_EDGE (orig_phi, orig_e); |
1155 | location_t orig_locus | |
1156 | = gimple_phi_arg_location_from_edge (orig_phi, orig_e); | |
1157 | ||
1158 | add_phi_arg (new_phi, orig_arg, new_e, orig_locus); | |
1159 | } | |
1160 | } | |
1161 | ||
ebfd146a IR |
1162 | free (new_bbs); |
1163 | free (bbs); | |
1164 | ||
b2b29377 | 1165 | checking_verify_dominators (CDI_DOMINATORS); |
2cfc56b9 | 1166 | |
ebfd146a IR |
1167 | return new_loop; |
1168 | } | |
1169 | ||
1170 | ||
a5e3d614 BC |
1171 | /* Given the condition expression COND, put it as the last statement of |
1172 | GUARD_BB; set both edges' probability; set dominator of GUARD_TO to | |
1173 | DOM_BB; return the skip edge. GUARD_TO is the target basic block to | |
3e907b90 BC |
1174 | skip the loop. PROBABILITY is the skip edge's probability. Mark the |
1175 | new edge as irreducible if IRREDUCIBLE_P is true. */ | |
ebfd146a IR |
1176 | |
1177 | static edge | |
86290011 | 1178 | slpeel_add_loop_guard (basic_block guard_bb, tree cond, |
a5e3d614 | 1179 | basic_block guard_to, basic_block dom_bb, |
357067f2 | 1180 | profile_probability probability, bool irreducible_p) |
ebfd146a IR |
1181 | { |
1182 | gimple_stmt_iterator gsi; | |
1183 | edge new_e, enter_e; | |
538dd0b7 | 1184 | gcond *cond_stmt; |
ebfd146a IR |
1185 | gimple_seq gimplify_stmt_list = NULL; |
1186 | ||
1187 | enter_e = EDGE_SUCC (guard_bb, 0); | |
1188 | enter_e->flags &= ~EDGE_FALLTHRU; | |
1189 | enter_e->flags |= EDGE_FALSE_VALUE; | |
1190 | gsi = gsi_last_bb (guard_bb); | |
1191 | ||
f7a06a98 RG |
1192 | cond = force_gimple_operand_1 (cond, &gimplify_stmt_list, is_gimple_condexpr, |
1193 | NULL_TREE); | |
86290011 | 1194 | if (gimplify_stmt_list) |
a5e3d614 | 1195 | gsi_insert_seq_after (&gsi, gimplify_stmt_list, GSI_NEW_STMT); |
ebfd146a | 1196 | |
a5e3d614 | 1197 | cond_stmt = gimple_build_cond_from_tree (cond, NULL_TREE, NULL_TREE); |
ebfd146a IR |
1198 | gsi = gsi_last_bb (guard_bb); |
1199 | gsi_insert_after (&gsi, cond_stmt, GSI_NEW_STMT); | |
1200 | ||
1201 | /* Add new edge to connect guard block to the merge/loop-exit block. */ | |
a5e3d614 | 1202 | new_e = make_edge (guard_bb, guard_to, EDGE_TRUE_VALUE); |
e78410bf | 1203 | |
e78410bf | 1204 | new_e->probability = probability; |
3e907b90 BC |
1205 | if (irreducible_p) |
1206 | new_e->flags |= EDGE_IRREDUCIBLE_LOOP; | |
1207 | ||
357067f2 | 1208 | enter_e->probability = probability.invert (); |
a5e3d614 | 1209 | set_immediate_dominator (CDI_DOMINATORS, guard_to, dom_bb); |
5281a167 RB |
1210 | |
1211 | /* Split enter_e to preserve LOOPS_HAVE_PREHEADERS. */ | |
1212 | if (enter_e->dest->loop_father->header == enter_e->dest) | |
1213 | split_edge (enter_e); | |
1214 | ||
ebfd146a IR |
1215 | return new_e; |
1216 | } | |
1217 | ||
1218 | ||
1219 | /* This function verifies that the following restrictions apply to LOOP: | |
a6c51a12 YR |
1220 | (1) it consists of exactly 2 basic blocks - header, and an empty latch |
1221 | for innermost loop and 5 basic blocks for outer-loop. | |
1222 | (2) it is single entry, single exit | |
1223 | (3) its exit condition is the last stmt in the header | |
1224 | (4) E is the entry/exit edge of LOOP. | |
ebfd146a IR |
1225 | */ |
1226 | ||
1227 | bool | |
1228 | slpeel_can_duplicate_loop_p (const struct loop *loop, const_edge e) | |
1229 | { | |
1230 | edge exit_e = single_exit (loop); | |
1231 | edge entry_e = loop_preheader_edge (loop); | |
538dd0b7 | 1232 | gcond *orig_cond = get_loop_exit_condition (loop); |
ebfd146a | 1233 | gimple_stmt_iterator loop_exit_gsi = gsi_last_bb (exit_e->src); |
a6c51a12 | 1234 | unsigned int num_bb = loop->inner? 5 : 2; |
ebfd146a | 1235 | |
62fdbf29 BC |
1236 | /* All loops have an outer scope; the only case loop->outer is NULL is for |
1237 | the function itself. */ | |
1238 | if (!loop_outer (loop) | |
a6c51a12 | 1239 | || loop->num_nodes != num_bb |
ebfd146a IR |
1240 | || !empty_block_p (loop->latch) |
1241 | || !single_exit (loop) | |
1242 | /* Verify that new loop exit condition can be trivially modified. */ | |
1243 | || (!orig_cond || orig_cond != gsi_stmt (loop_exit_gsi)) | |
1244 | || (e != exit_e && e != entry_e)) | |
1245 | return false; | |
1246 | ||
1247 | return true; | |
1248 | } | |
1249 | ||
a5e3d614 BC |
1250 | /* If the loop has a virtual PHI, but exit bb doesn't, create a virtual PHI |
1251 | in the exit bb and rename all the uses after the loop. This simplifies | |
1252 | the *guard[12] routines, which assume loop closed SSA form for all PHIs | |
1253 | (but normally loop closed SSA form doesn't require virtual PHIs to be | |
1254 | in the same form). Doing this early simplifies the checking what | |
1255 | uses should be renamed. */ | |
ebfd146a IR |
1256 | |
1257 | static void | |
a5e3d614 | 1258 | create_lcssa_for_virtual_phi (struct loop *loop) |
ebfd146a | 1259 | { |
538dd0b7 | 1260 | gphi_iterator gsi; |
ebfd146a | 1261 | edge exit_e = single_exit (loop); |
b8698a0f | 1262 | |
e20f6b4b | 1263 | for (gsi = gsi_start_phis (loop->header); !gsi_end_p (gsi); gsi_next (&gsi)) |
ea057359 | 1264 | if (virtual_operand_p (gimple_phi_result (gsi_stmt (gsi)))) |
e20f6b4b | 1265 | { |
538dd0b7 | 1266 | gphi *phi = gsi.phi (); |
e20f6b4b JJ |
1267 | for (gsi = gsi_start_phis (exit_e->dest); |
1268 | !gsi_end_p (gsi); gsi_next (&gsi)) | |
ea057359 | 1269 | if (virtual_operand_p (gimple_phi_result (gsi_stmt (gsi)))) |
e20f6b4b JJ |
1270 | break; |
1271 | if (gsi_end_p (gsi)) | |
1272 | { | |
b731b390 | 1273 | tree new_vop = copy_ssa_name (PHI_RESULT (phi)); |
538dd0b7 | 1274 | gphi *new_phi = create_phi_node (new_vop, exit_e->dest); |
e20f6b4b JJ |
1275 | tree vop = PHI_ARG_DEF_FROM_EDGE (phi, EDGE_SUCC (loop->latch, 0)); |
1276 | imm_use_iterator imm_iter; | |
355fe088 | 1277 | gimple *stmt; |
e20f6b4b JJ |
1278 | use_operand_p use_p; |
1279 | ||
15b6695a RB |
1280 | SSA_NAME_OCCURS_IN_ABNORMAL_PHI (new_vop) |
1281 | = SSA_NAME_OCCURS_IN_ABNORMAL_PHI (vop); | |
9e227d60 | 1282 | add_phi_arg (new_phi, vop, exit_e, UNKNOWN_LOCATION); |
e20f6b4b JJ |
1283 | gimple_phi_set_result (new_phi, new_vop); |
1284 | FOR_EACH_IMM_USE_STMT (stmt, imm_iter, vop) | |
b5fd0440 YR |
1285 | if (stmt != new_phi |
1286 | && !flow_bb_inside_loop_p (loop, gimple_bb (stmt))) | |
e20f6b4b JJ |
1287 | FOR_EACH_IMM_USE_ON_STMT (use_p, imm_iter) |
1288 | SET_USE (use_p, new_vop); | |
1289 | } | |
1290 | break; | |
1291 | } | |
ebfd146a | 1292 | |
ebfd146a IR |
1293 | } |
1294 | ||
1295 | /* Function vect_get_loop_location. | |
1296 | ||
1297 | Extract the location of the loop in the source code. | |
1298 | If the loop is not well formed for vectorization, an estimated | |
1299 | location is calculated. | |
1300 | Return the loop location if succeed and NULL if not. */ | |
1301 | ||
b05e0233 | 1302 | source_location |
ebfd146a IR |
1303 | find_loop_location (struct loop *loop) |
1304 | { | |
355fe088 | 1305 | gimple *stmt = NULL; |
ebfd146a IR |
1306 | basic_block bb; |
1307 | gimple_stmt_iterator si; | |
1308 | ||
1309 | if (!loop) | |
b05e0233 | 1310 | return UNKNOWN_LOCATION; |
ebfd146a IR |
1311 | |
1312 | stmt = get_loop_exit_condition (loop); | |
1313 | ||
502498d5 JJ |
1314 | if (stmt |
1315 | && LOCATION_LOCUS (gimple_location (stmt)) > BUILTINS_LOCATION) | |
ebfd146a IR |
1316 | return gimple_location (stmt); |
1317 | ||
1318 | /* If we got here the loop is probably not "well formed", | |
1319 | try to estimate the loop location */ | |
1320 | ||
1321 | if (!loop->header) | |
b05e0233 | 1322 | return UNKNOWN_LOCATION; |
ebfd146a IR |
1323 | |
1324 | bb = loop->header; | |
1325 | ||
1326 | for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si)) | |
1327 | { | |
1328 | stmt = gsi_stmt (si); | |
502498d5 | 1329 | if (LOCATION_LOCUS (gimple_location (stmt)) > BUILTINS_LOCATION) |
ebfd146a IR |
1330 | return gimple_location (stmt); |
1331 | } | |
1332 | ||
b05e0233 | 1333 | return UNKNOWN_LOCATION; |
ebfd146a IR |
1334 | } |
1335 | ||
a5e3d614 BC |
1336 | /* Return true if PHI defines an IV of the loop to be vectorized. */ |
1337 | ||
1338 | static bool | |
1339 | iv_phi_p (gphi *phi) | |
1340 | { | |
1341 | if (virtual_operand_p (PHI_RESULT (phi))) | |
1342 | return false; | |
1343 | ||
1344 | stmt_vec_info stmt_info = vinfo_for_stmt (phi); | |
1345 | gcc_assert (stmt_info != NULL); | |
1346 | if (STMT_VINFO_DEF_TYPE (stmt_info) == vect_reduction_def | |
1347 | || STMT_VINFO_DEF_TYPE (stmt_info) == vect_double_reduction_def) | |
1348 | return false; | |
1349 | ||
1350 | return true; | |
1351 | } | |
ebfd146a | 1352 | |
ebfd146a IR |
1353 | /* Function vect_can_advance_ivs_p |
1354 | ||
b8698a0f L |
1355 | In case the number of iterations that LOOP iterates is unknown at compile |
1356 | time, an epilog loop will be generated, and the loop induction variables | |
1357 | (IVs) will be "advanced" to the value they are supposed to take just before | |
ebfd146a IR |
1358 | the epilog loop. Here we check that the access function of the loop IVs |
1359 | and the expression that represents the loop bound are simple enough. | |
1360 | These restrictions will be relaxed in the future. */ | |
1361 | ||
b8698a0f | 1362 | bool |
ebfd146a IR |
1363 | vect_can_advance_ivs_p (loop_vec_info loop_vinfo) |
1364 | { | |
1365 | struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo); | |
1366 | basic_block bb = loop->header; | |
538dd0b7 | 1367 | gphi_iterator gsi; |
ebfd146a IR |
1368 | |
1369 | /* Analyze phi functions of the loop header. */ | |
1370 | ||
73fbfcad | 1371 | if (dump_enabled_p ()) |
e645e942 | 1372 | dump_printf_loc (MSG_NOTE, vect_location, "vect_can_advance_ivs_p:\n"); |
ebfd146a IR |
1373 | for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
1374 | { | |
ebfd146a IR |
1375 | tree evolution_part; |
1376 | ||
a5e3d614 | 1377 | gphi *phi = gsi.phi (); |
73fbfcad | 1378 | if (dump_enabled_p ()) |
ebfd146a | 1379 | { |
78c60e3d SS |
1380 | dump_printf_loc (MSG_NOTE, vect_location, "Analyze phi: "); |
1381 | dump_gimple_stmt (MSG_NOTE, TDF_SLIM, phi, 0); | |
ebfd146a IR |
1382 | } |
1383 | ||
1384 | /* Skip virtual phi's. The data dependences that are associated with | |
a5e3d614 | 1385 | virtual defs/uses (i.e., memory accesses) are analyzed elsewhere. |
ebfd146a | 1386 | |
a5e3d614 BC |
1387 | Skip reduction phis. */ |
1388 | if (!iv_phi_p (phi)) | |
ebfd146a | 1389 | { |
73fbfcad | 1390 | if (dump_enabled_p ()) |
a5e3d614 BC |
1391 | dump_printf_loc (MSG_NOTE, vect_location, |
1392 | "reduc or virtual phi. skip.\n"); | |
ebfd146a IR |
1393 | continue; |
1394 | } | |
1395 | ||
ebfd146a IR |
1396 | /* Analyze the evolution function. */ |
1397 | ||
afb119be RB |
1398 | evolution_part |
1399 | = STMT_VINFO_LOOP_PHI_EVOLUTION_PART (vinfo_for_stmt (phi)); | |
ebfd146a IR |
1400 | if (evolution_part == NULL_TREE) |
1401 | { | |
73fbfcad | 1402 | if (dump_enabled_p ()) |
afb119be | 1403 | dump_printf (MSG_MISSED_OPTIMIZATION, |
e645e942 | 1404 | "No access function or evolution.\n"); |
ebfd146a IR |
1405 | return false; |
1406 | } | |
b8698a0f | 1407 | |
2a93954e AH |
1408 | /* FORNOW: We do not transform initial conditions of IVs |
1409 | which evolution functions are not invariants in the loop. */ | |
1410 | ||
1411 | if (!expr_invariant_in_loop_p (loop, evolution_part)) | |
1412 | { | |
1413 | if (dump_enabled_p ()) | |
1414 | dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location, | |
1415 | "evolution not invariant in loop.\n"); | |
1416 | return false; | |
1417 | } | |
1418 | ||
b8698a0f | 1419 | /* FORNOW: We do not transform initial conditions of IVs |
ebfd146a IR |
1420 | which evolution functions are a polynomial of degree >= 2. */ |
1421 | ||
1422 | if (tree_is_chrec (evolution_part)) | |
2a93954e AH |
1423 | { |
1424 | if (dump_enabled_p ()) | |
1425 | dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location, | |
1426 | "evolution is chrec.\n"); | |
1427 | return false; | |
1428 | } | |
ebfd146a IR |
1429 | } |
1430 | ||
1431 | return true; | |
1432 | } | |
1433 | ||
1434 | ||
1435 | /* Function vect_update_ivs_after_vectorizer. | |
1436 | ||
1437 | "Advance" the induction variables of LOOP to the value they should take | |
1438 | after the execution of LOOP. This is currently necessary because the | |
1439 | vectorizer does not handle induction variables that are used after the | |
1440 | loop. Such a situation occurs when the last iterations of LOOP are | |
1441 | peeled, because: | |
1442 | 1. We introduced new uses after LOOP for IVs that were not originally used | |
1443 | after LOOP: the IVs of LOOP are now used by an epilog loop. | |
1444 | 2. LOOP is going to be vectorized; this means that it will iterate N/VF | |
1445 | times, whereas the loop IVs should be bumped N times. | |
1446 | ||
1447 | Input: | |
1448 | - LOOP - a loop that is going to be vectorized. The last few iterations | |
1449 | of LOOP were peeled. | |
1450 | - NITERS - the number of iterations that LOOP executes (before it is | |
1451 | vectorized). i.e, the number of times the ivs should be bumped. | |
1452 | - UPDATE_E - a successor edge of LOOP->exit that is on the (only) path | |
1453 | coming out from LOOP on which there are uses of the LOOP ivs | |
1454 | (this is the path from LOOP->exit to epilog_loop->preheader). | |
1455 | ||
1456 | The new definitions of the ivs are placed in LOOP->exit. | |
1457 | The phi args associated with the edge UPDATE_E in the bb | |
1458 | UPDATE_E->dest are updated accordingly. | |
1459 | ||
1460 | Assumption 1: Like the rest of the vectorizer, this function assumes | |
1461 | a single loop exit that has a single predecessor. | |
1462 | ||
1463 | Assumption 2: The phi nodes in the LOOP header and in update_bb are | |
1464 | organized in the same order. | |
1465 | ||
1466 | Assumption 3: The access function of the ivs is simple enough (see | |
1467 | vect_can_advance_ivs_p). This assumption will be relaxed in the future. | |
1468 | ||
1469 | Assumption 4: Exactly one of the successors of LOOP exit-bb is on a path | |
b8698a0f | 1470 | coming out of LOOP on which the ivs of LOOP are used (this is the path |
ebfd146a IR |
1471 | that leads to the epilog loop; other paths skip the epilog loop). This |
1472 | path starts with the edge UPDATE_E, and its destination (denoted update_bb) | |
1473 | needs to have its phis updated. | |
1474 | */ | |
1475 | ||
1476 | static void | |
a5e3d614 BC |
1477 | vect_update_ivs_after_vectorizer (loop_vec_info loop_vinfo, |
1478 | tree niters, edge update_e) | |
ebfd146a | 1479 | { |
538dd0b7 | 1480 | gphi_iterator gsi, gsi1; |
a5e3d614 | 1481 | struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo); |
ebfd146a | 1482 | basic_block update_bb = update_e->dest; |
a5e3d614 | 1483 | basic_block exit_bb = single_exit (loop)->dest; |
ebfd146a IR |
1484 | |
1485 | /* Make sure there exists a single-predecessor exit bb: */ | |
1486 | gcc_assert (single_pred_p (exit_bb)); | |
a5e3d614 | 1487 | gcc_assert (single_succ_edge (exit_bb) == update_e); |
ebfd146a IR |
1488 | |
1489 | for (gsi = gsi_start_phis (loop->header), gsi1 = gsi_start_phis (update_bb); | |
1490 | !gsi_end_p (gsi) && !gsi_end_p (gsi1); | |
1491 | gsi_next (&gsi), gsi_next (&gsi1)) | |
1492 | { | |
ebfd146a | 1493 | tree init_expr; |
550918ca RG |
1494 | tree step_expr, off; |
1495 | tree type; | |
ebfd146a IR |
1496 | tree var, ni, ni_name; |
1497 | gimple_stmt_iterator last_gsi; | |
1498 | ||
a5e3d614 BC |
1499 | gphi *phi = gsi.phi (); |
1500 | gphi *phi1 = gsi1.phi (); | |
73fbfcad | 1501 | if (dump_enabled_p ()) |
a5e3d614 BC |
1502 | { |
1503 | dump_printf_loc (MSG_NOTE, vect_location, | |
1504 | "vect_update_ivs_after_vectorizer: phi: "); | |
78c60e3d | 1505 | dump_gimple_stmt (MSG_NOTE, TDF_SLIM, phi, 0); |
a5e3d614 | 1506 | } |
ebfd146a | 1507 | |
a5e3d614 BC |
1508 | /* Skip reduction and virtual phis. */ |
1509 | if (!iv_phi_p (phi)) | |
ebfd146a | 1510 | { |
73fbfcad | 1511 | if (dump_enabled_p ()) |
a5e3d614 BC |
1512 | dump_printf_loc (MSG_NOTE, vect_location, |
1513 | "reduc or virtual phi. skip.\n"); | |
ebfd146a IR |
1514 | continue; |
1515 | } | |
1516 | ||
0ac168a1 | 1517 | type = TREE_TYPE (gimple_phi_result (phi)); |
a5e3d614 | 1518 | step_expr = STMT_VINFO_LOOP_PHI_EVOLUTION_PART (vinfo_for_stmt (phi)); |
0ac168a1 | 1519 | step_expr = unshare_expr (step_expr); |
b8698a0f | 1520 | |
ebfd146a IR |
1521 | /* FORNOW: We do not support IVs whose evolution function is a polynomial |
1522 | of degree >= 2 or exponential. */ | |
0ac168a1 | 1523 | gcc_assert (!tree_is_chrec (step_expr)); |
ebfd146a | 1524 | |
0ac168a1 | 1525 | init_expr = PHI_ARG_DEF_FROM_EDGE (phi, loop_preheader_edge (loop)); |
ebfd146a | 1526 | |
550918ca RG |
1527 | off = fold_build2 (MULT_EXPR, TREE_TYPE (step_expr), |
1528 | fold_convert (TREE_TYPE (step_expr), niters), | |
1529 | step_expr); | |
0ac168a1 | 1530 | if (POINTER_TYPE_P (type)) |
5d49b6a7 | 1531 | ni = fold_build_pointer_plus (init_expr, off); |
ebfd146a | 1532 | else |
0ac168a1 RG |
1533 | ni = fold_build2 (PLUS_EXPR, type, |
1534 | init_expr, fold_convert (type, off)); | |
ebfd146a | 1535 | |
0ac168a1 | 1536 | var = create_tmp_var (type, "tmp"); |
ebfd146a IR |
1537 | |
1538 | last_gsi = gsi_last_bb (exit_bb); | |
a5e3d614 BC |
1539 | gimple_seq new_stmts = NULL; |
1540 | ni_name = force_gimple_operand (ni, &new_stmts, false, var); | |
1541 | /* Exit_bb shouldn't be empty. */ | |
1542 | if (!gsi_end_p (last_gsi)) | |
1543 | gsi_insert_seq_after (&last_gsi, new_stmts, GSI_SAME_STMT); | |
1544 | else | |
1545 | gsi_insert_seq_before (&last_gsi, new_stmts, GSI_SAME_STMT); | |
b8698a0f | 1546 | |
ebfd146a | 1547 | /* Fix phi expressions in the successor bb. */ |
684f25f4 | 1548 | adjust_phi_and_debug_stmts (phi1, update_e, ni_name); |
ebfd146a IR |
1549 | } |
1550 | } | |
1551 | ||
535e7c11 RS |
1552 | /* Return a gimple value containing the misalignment (measured in vector |
1553 | elements) for the loop described by LOOP_VINFO, i.e. how many elements | |
1554 | it is away from a perfectly aligned address. Add any new statements | |
1555 | to SEQ. */ | |
1556 | ||
1557 | static tree | |
1558 | get_misalign_in_elems (gimple **seq, loop_vec_info loop_vinfo) | |
1559 | { | |
1560 | struct data_reference *dr = LOOP_VINFO_UNALIGNED_DR (loop_vinfo); | |
1561 | gimple *dr_stmt = DR_STMT (dr); | |
1562 | stmt_vec_info stmt_info = vinfo_for_stmt (dr_stmt); | |
1563 | tree vectype = STMT_VINFO_VECTYPE (stmt_info); | |
1564 | ||
1565 | unsigned int target_align = DR_TARGET_ALIGNMENT (dr); | |
1566 | gcc_assert (target_align != 0); | |
1567 | ||
1568 | bool negative = tree_int_cst_compare (DR_STEP (dr), size_zero_node) < 0; | |
1569 | tree offset = (negative | |
1570 | ? size_int (-TYPE_VECTOR_SUBPARTS (vectype) + 1) | |
1571 | : size_zero_node); | |
1572 | tree start_addr = vect_create_addr_base_for_vector_ref (dr_stmt, seq, | |
1573 | offset); | |
1574 | tree type = unsigned_type_for (TREE_TYPE (start_addr)); | |
1575 | tree target_align_minus_1 = build_int_cst (type, target_align - 1); | |
1576 | HOST_WIDE_INT elem_size | |
1577 | = int_cst_value (TYPE_SIZE_UNIT (TREE_TYPE (vectype))); | |
1578 | tree elem_size_log = build_int_cst (type, exact_log2 (elem_size)); | |
1579 | ||
1580 | /* Create: misalign_in_bytes = addr & (target_align - 1). */ | |
1581 | tree int_start_addr = fold_convert (type, start_addr); | |
1582 | tree misalign_in_bytes = fold_build2 (BIT_AND_EXPR, type, int_start_addr, | |
1583 | target_align_minus_1); | |
1584 | ||
1585 | /* Create: misalign_in_elems = misalign_in_bytes / element_size. */ | |
1586 | tree misalign_in_elems = fold_build2 (RSHIFT_EXPR, type, misalign_in_bytes, | |
1587 | elem_size_log); | |
1588 | ||
1589 | return misalign_in_elems; | |
1590 | } | |
1591 | ||
a5e3d614 | 1592 | /* Function vect_gen_prolog_loop_niters |
d9157f15 | 1593 | |
a5e3d614 BC |
1594 | Generate the number of iterations which should be peeled as prolog for the |
1595 | loop represented by LOOP_VINFO. It is calculated as the misalignment of | |
1596 | DR - the data reference recorded in LOOP_VINFO_UNALIGNED_DR (LOOP_VINFO). | |
1597 | As a result, after the execution of this loop, the data reference DR will | |
1598 | refer to an aligned location. The following computation is generated: | |
ebfd146a IR |
1599 | |
1600 | If the misalignment of DR is known at compile time: | |
1601 | addr_mis = int mis = DR_MISALIGNMENT (dr); | |
1602 | Else, compute address misalignment in bytes: | |
535e7c11 | 1603 | addr_mis = addr & (target_align - 1) |
ebfd146a | 1604 | |
a5e3d614 | 1605 | prolog_niters = ((VF - addr_mis/elem_size)&(VF-1))/step |
ebfd146a IR |
1606 | |
1607 | (elem_size = element type size; an element is the scalar element whose type | |
1608 | is the inner type of the vectype) | |
1609 | ||
a5e3d614 | 1610 | The computations will be emitted at the end of BB. We also compute and |
cbb22e61 | 1611 | store upper bound (included) of the result in BOUND. |
a5e3d614 | 1612 | |
ebfd146a IR |
1613 | When the step of the data-ref in the loop is not 1 (as in interleaved data |
1614 | and SLP), the number of iterations of the prolog must be divided by the step | |
1615 | (which is equal to the size of interleaved group). | |
1616 | ||
1617 | The above formulas assume that VF == number of elements in the vector. This | |
1618 | may not hold when there are multiple-types in the loop. | |
1619 | In this case, for some data-references in the loop the VF does not represent | |
1620 | the number of elements that fit in the vector. Therefore, instead of VF we | |
1621 | use TYPE_VECTOR_SUBPARTS. */ | |
1622 | ||
b8698a0f | 1623 | static tree |
a5e3d614 BC |
1624 | vect_gen_prolog_loop_niters (loop_vec_info loop_vinfo, |
1625 | basic_block bb, int *bound) | |
ebfd146a IR |
1626 | { |
1627 | struct data_reference *dr = LOOP_VINFO_UNALIGNED_DR (loop_vinfo); | |
ebfd146a | 1628 | tree var; |
a5e3d614 BC |
1629 | tree niters_type = TREE_TYPE (LOOP_VINFO_NITERS (loop_vinfo)); |
1630 | gimple_seq stmts = NULL, new_stmts = NULL; | |
ebfd146a | 1631 | tree iters, iters_name; |
355fe088 | 1632 | gimple *dr_stmt = DR_STMT (dr); |
ebfd146a IR |
1633 | stmt_vec_info stmt_info = vinfo_for_stmt (dr_stmt); |
1634 | tree vectype = STMT_VINFO_VECTYPE (stmt_info); | |
f702e7d4 | 1635 | unsigned int target_align = DR_TARGET_ALIGNMENT (dr); |
ebfd146a | 1636 | |
15e693cc | 1637 | if (LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo) > 0) |
ebfd146a | 1638 | { |
15e693cc | 1639 | int npeel = LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo); |
ebfd146a | 1640 | |
73fbfcad | 1641 | if (dump_enabled_p ()) |
ccb3ad87 | 1642 | dump_printf_loc (MSG_NOTE, vect_location, |
e645e942 | 1643 | "known peeling = %d.\n", npeel); |
ebfd146a | 1644 | |
720f5239 | 1645 | iters = build_int_cst (niters_type, npeel); |
cbb22e61 | 1646 | *bound = LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo); |
ebfd146a IR |
1647 | } |
1648 | else | |
1649 | { | |
535e7c11 RS |
1650 | tree misalign_in_elems = get_misalign_in_elems (&stmts, loop_vinfo); |
1651 | tree type = TREE_TYPE (misalign_in_elems); | |
f702e7d4 RS |
1652 | HOST_WIDE_INT elem_size |
1653 | = int_cst_value (TYPE_SIZE_UNIT (TREE_TYPE (vectype))); | |
f702e7d4 RS |
1654 | HOST_WIDE_INT align_in_elems = target_align / elem_size; |
1655 | tree align_in_elems_minus_1 = build_int_cst (type, align_in_elems - 1); | |
1656 | tree align_in_elems_tree = build_int_cst (type, align_in_elems); | |
f702e7d4 RS |
1657 | |
1658 | /* Create: (niters_type) ((align_in_elems - misalign_in_elems) | |
1659 | & (align_in_elems - 1)). */ | |
535e7c11 | 1660 | bool negative = tree_int_cst_compare (DR_STEP (dr), size_zero_node) < 0; |
d8ba5b19 | 1661 | if (negative) |
f702e7d4 RS |
1662 | iters = fold_build2 (MINUS_EXPR, type, misalign_in_elems, |
1663 | align_in_elems_tree); | |
d8ba5b19 | 1664 | else |
f702e7d4 RS |
1665 | iters = fold_build2 (MINUS_EXPR, type, align_in_elems_tree, |
1666 | misalign_in_elems); | |
1667 | iters = fold_build2 (BIT_AND_EXPR, type, iters, align_in_elems_minus_1); | |
ebfd146a | 1668 | iters = fold_convert (niters_type, iters); |
f702e7d4 | 1669 | *bound = align_in_elems - 1; |
ebfd146a IR |
1670 | } |
1671 | ||
73fbfcad | 1672 | if (dump_enabled_p ()) |
ebfd146a | 1673 | { |
ccb3ad87 | 1674 | dump_printf_loc (MSG_NOTE, vect_location, |
78c60e3d | 1675 | "niters for prolog loop: "); |
ccb3ad87 | 1676 | dump_generic_expr (MSG_NOTE, TDF_SLIM, iters); |
e645e942 | 1677 | dump_printf (MSG_NOTE, "\n"); |
ebfd146a IR |
1678 | } |
1679 | ||
1680 | var = create_tmp_var (niters_type, "prolog_loop_niters"); | |
a5e3d614 | 1681 | iters_name = force_gimple_operand (iters, &new_stmts, false, var); |
ebfd146a | 1682 | |
a5e3d614 BC |
1683 | if (new_stmts) |
1684 | gimple_seq_add_seq (&stmts, new_stmts); | |
ebfd146a IR |
1685 | if (stmts) |
1686 | { | |
a5e3d614 BC |
1687 | gcc_assert (single_succ_p (bb)); |
1688 | gimple_stmt_iterator gsi = gsi_last_bb (bb); | |
1689 | if (gsi_end_p (gsi)) | |
1690 | gsi_insert_seq_before (&gsi, stmts, GSI_SAME_STMT); | |
1691 | else | |
1692 | gsi_insert_seq_after (&gsi, stmts, GSI_SAME_STMT); | |
ebfd146a | 1693 | } |
b8698a0f | 1694 | return iters_name; |
ebfd146a IR |
1695 | } |
1696 | ||
1697 | ||
1698 | /* Function vect_update_init_of_dr | |
1699 | ||
535e7c11 RS |
1700 | If CODE is PLUS, the vector loop starts NITERS iterations after the |
1701 | scalar one, otherwise CODE is MINUS and the vector loop starts NITERS | |
1702 | iterations before the scalar one (using masking to skip inactive | |
1703 | elements). This function updates the information recorded in DR to | |
1704 | account for the difference. Specifically, it updates the OFFSET | |
1705 | field of DR. */ | |
ebfd146a IR |
1706 | |
1707 | static void | |
535e7c11 | 1708 | vect_update_init_of_dr (struct data_reference *dr, tree niters, tree_code code) |
ebfd146a IR |
1709 | { |
1710 | tree offset = DR_OFFSET (dr); | |
b8698a0f | 1711 | |
ebfd146a IR |
1712 | niters = fold_build2 (MULT_EXPR, sizetype, |
1713 | fold_convert (sizetype, niters), | |
1714 | fold_convert (sizetype, DR_STEP (dr))); | |
535e7c11 | 1715 | offset = fold_build2 (code, sizetype, |
587aa063 | 1716 | fold_convert (sizetype, offset), niters); |
ebfd146a IR |
1717 | DR_OFFSET (dr) = offset; |
1718 | } | |
1719 | ||
1720 | ||
1721 | /* Function vect_update_inits_of_drs | |
1722 | ||
535e7c11 RS |
1723 | Apply vect_update_inits_of_dr to all accesses in LOOP_VINFO. |
1724 | CODE and NITERS are as for vect_update_inits_of_dr. */ | |
ebfd146a IR |
1725 | |
1726 | static void | |
535e7c11 RS |
1727 | vect_update_inits_of_drs (loop_vec_info loop_vinfo, tree niters, |
1728 | tree_code code) | |
ebfd146a IR |
1729 | { |
1730 | unsigned int i; | |
9771b263 | 1731 | vec<data_reference_p> datarefs = LOOP_VINFO_DATAREFS (loop_vinfo); |
ebfd146a | 1732 | struct data_reference *dr; |
a5e3d614 BC |
1733 | |
1734 | if (dump_enabled_p ()) | |
ccb3ad87 | 1735 | dump_printf_loc (MSG_NOTE, vect_location, |
a5e3d614 BC |
1736 | "=== vect_update_inits_of_dr ===\n"); |
1737 | ||
1738 | /* Adjust niters to sizetype and insert stmts on loop preheader edge. */ | |
1739 | if (!types_compatible_p (sizetype, TREE_TYPE (niters))) | |
1740 | { | |
1741 | gimple_seq seq; | |
1742 | edge pe = loop_preheader_edge (LOOP_VINFO_LOOP (loop_vinfo)); | |
1743 | tree var = create_tmp_var (sizetype, "prolog_loop_adjusted_niters"); | |
1744 | ||
1745 | niters = fold_convert (sizetype, niters); | |
1746 | niters = force_gimple_operand (niters, &seq, false, var); | |
1747 | if (seq) | |
1748 | { | |
1749 | basic_block new_bb = gsi_insert_seq_on_edge_immediate (pe, seq); | |
1750 | gcc_assert (!new_bb); | |
1751 | } | |
1752 | } | |
ebfd146a | 1753 | |
9771b263 | 1754 | FOR_EACH_VEC_ELT (datarefs, i, dr) |
535e7c11 | 1755 | vect_update_init_of_dr (dr, niters, code); |
ebfd146a IR |
1756 | } |
1757 | ||
535e7c11 RS |
1758 | /* For the information recorded in LOOP_VINFO prepare the loop for peeling |
1759 | by masking. This involves calculating the number of iterations to | |
1760 | be peeled and then aligning all memory references appropriately. */ | |
1761 | ||
1762 | void | |
1763 | vect_prepare_for_masked_peels (loop_vec_info loop_vinfo) | |
1764 | { | |
1765 | tree misalign_in_elems; | |
1766 | tree type = LOOP_VINFO_MASK_COMPARE_TYPE (loop_vinfo); | |
1767 | ||
1768 | gcc_assert (vect_use_loop_mask_for_alignment_p (loop_vinfo)); | |
1769 | ||
1770 | /* From the information recorded in LOOP_VINFO get the number of iterations | |
1771 | that need to be skipped via masking. */ | |
1772 | if (LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo) > 0) | |
1773 | { | |
1774 | poly_int64 misalign = (LOOP_VINFO_VECT_FACTOR (loop_vinfo) | |
1775 | - LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo)); | |
1776 | misalign_in_elems = build_int_cst (type, misalign); | |
1777 | } | |
1778 | else | |
1779 | { | |
1780 | gimple_seq seq1 = NULL, seq2 = NULL; | |
1781 | misalign_in_elems = get_misalign_in_elems (&seq1, loop_vinfo); | |
1782 | misalign_in_elems = fold_convert (type, misalign_in_elems); | |
1783 | misalign_in_elems = force_gimple_operand (misalign_in_elems, | |
1784 | &seq2, true, NULL_TREE); | |
1785 | gimple_seq_add_seq (&seq1, seq2); | |
1786 | if (seq1) | |
1787 | { | |
1788 | edge pe = loop_preheader_edge (LOOP_VINFO_LOOP (loop_vinfo)); | |
1789 | basic_block new_bb = gsi_insert_seq_on_edge_immediate (pe, seq1); | |
1790 | gcc_assert (!new_bb); | |
1791 | } | |
1792 | } | |
1793 | ||
1794 | if (dump_enabled_p ()) | |
1795 | { | |
1796 | dump_printf_loc (MSG_NOTE, vect_location, | |
1797 | "misalignment for fully-masked loop: "); | |
1798 | dump_generic_expr (MSG_NOTE, TDF_SLIM, misalign_in_elems); | |
1799 | dump_printf (MSG_NOTE, "\n"); | |
1800 | } | |
1801 | ||
1802 | LOOP_VINFO_MASK_SKIP_NITERS (loop_vinfo) = misalign_in_elems; | |
1803 | ||
1804 | vect_update_inits_of_drs (loop_vinfo, misalign_in_elems, MINUS_EXPR); | |
1805 | } | |
ebfd146a | 1806 | |
a5e3d614 | 1807 | /* This function builds ni_name = number of iterations. Statements |
7078979b BC |
1808 | are emitted on the loop preheader edge. If NEW_VAR_P is not NULL, set |
1809 | it to TRUE if new ssa_var is generated. */ | |
a5e3d614 BC |
1810 | |
1811 | tree | |
7078979b | 1812 | vect_build_loop_niters (loop_vec_info loop_vinfo, bool *new_var_p) |
a5e3d614 BC |
1813 | { |
1814 | tree ni = unshare_expr (LOOP_VINFO_NITERS (loop_vinfo)); | |
1815 | if (TREE_CODE (ni) == INTEGER_CST) | |
1816 | return ni; | |
1817 | else | |
1818 | { | |
1819 | tree ni_name, var; | |
1820 | gimple_seq stmts = NULL; | |
1821 | edge pe = loop_preheader_edge (LOOP_VINFO_LOOP (loop_vinfo)); | |
1822 | ||
1823 | var = create_tmp_var (TREE_TYPE (ni), "niters"); | |
1824 | ni_name = force_gimple_operand (ni, &stmts, false, var); | |
1825 | if (stmts) | |
7078979b BC |
1826 | { |
1827 | gsi_insert_seq_on_edge_immediate (pe, stmts); | |
1828 | if (new_var_p != NULL) | |
1829 | *new_var_p = true; | |
1830 | } | |
a5e3d614 BC |
1831 | |
1832 | return ni_name; | |
1833 | } | |
1834 | } | |
1835 | ||
cbb22e61 BC |
1836 | /* Calculate the number of iterations above which vectorized loop will be |
1837 | preferred than scalar loop. NITERS_PROLOG is the number of iterations | |
1838 | of prolog loop. If it's integer const, the integer number is also passed | |
1839 | in INT_NITERS_PROLOG. BOUND_PROLOG is the upper bound (included) of | |
1840 | number of iterations of prolog loop. VFM1 is vector factor minus one. | |
1841 | If CHECK_PROFITABILITY is true, TH is the threshold below which scalar | |
1842 | (rather than vectorized) loop will be executed. This function stores | |
1843 | upper bound (included) of the result in BOUND_SCALAR. */ | |
a5e3d614 BC |
1844 | |
1845 | static tree | |
1846 | vect_gen_scalar_loop_niters (tree niters_prolog, int int_niters_prolog, | |
d9f21f6a RS |
1847 | int bound_prolog, poly_int64 vfm1, int th, |
1848 | poly_uint64 *bound_scalar, | |
1849 | bool check_profitability) | |
a5e3d614 BC |
1850 | { |
1851 | tree type = TREE_TYPE (niters_prolog); | |
1852 | tree niters = fold_build2 (PLUS_EXPR, type, niters_prolog, | |
cbb22e61 | 1853 | build_int_cst (type, vfm1)); |
a5e3d614 | 1854 | |
cbb22e61 | 1855 | *bound_scalar = vfm1 + bound_prolog; |
a5e3d614 BC |
1856 | if (check_profitability) |
1857 | { | |
cbb22e61 BC |
1858 | /* TH indicates the minimum niters of vectorized loop, while we |
1859 | compute the maximum niters of scalar loop. */ | |
1860 | th--; | |
a5e3d614 BC |
1861 | /* Peeling for constant times. */ |
1862 | if (int_niters_prolog >= 0) | |
1863 | { | |
d9f21f6a | 1864 | *bound_scalar = upper_bound (int_niters_prolog + vfm1, th); |
cbb22e61 | 1865 | return build_int_cst (type, *bound_scalar); |
a5e3d614 | 1866 | } |
cbb22e61 BC |
1867 | /* Peeling for unknown times. Note BOUND_PROLOG is the upper |
1868 | bound (inlcuded) of niters of prolog loop. */ | |
d9f21f6a | 1869 | if (known_ge (th, vfm1 + bound_prolog)) |
a5e3d614 | 1870 | { |
cbb22e61 | 1871 | *bound_scalar = th; |
a5e3d614 BC |
1872 | return build_int_cst (type, th); |
1873 | } | |
d9f21f6a RS |
1874 | /* Need to do runtime comparison. */ |
1875 | else if (maybe_gt (th, vfm1)) | |
1876 | { | |
1877 | *bound_scalar = upper_bound (*bound_scalar, th); | |
1878 | return fold_build2 (MAX_EXPR, type, | |
1879 | build_int_cst (type, th), niters); | |
1880 | } | |
a5e3d614 BC |
1881 | } |
1882 | return niters; | |
1883 | } | |
1884 | ||
0f26839a RS |
1885 | /* NITERS is the number of times that the original scalar loop executes |
1886 | after peeling. Work out the maximum number of iterations N that can | |
1887 | be handled by the vectorized form of the loop and then either: | |
ebfd146a | 1888 | |
0f26839a | 1889 | a) set *STEP_VECTOR_PTR to the vectorization factor and generate: |
d9157f15 | 1890 | |
0f26839a RS |
1891 | niters_vector = N |
1892 | ||
1893 | b) set *STEP_VECTOR_PTR to one and generate: | |
1894 | ||
1895 | niters_vector = N / vf | |
1896 | ||
1897 | In both cases, store niters_vector in *NITERS_VECTOR_PTR and add | |
1898 | any new statements on the loop preheader edge. NITERS_NO_OVERFLOW | |
1899 | is true if NITERS doesn't overflow (i.e. if NITERS is always nonzero). */ | |
ebfd146a IR |
1900 | |
1901 | void | |
a5e3d614 | 1902 | vect_gen_vector_loop_niters (loop_vec_info loop_vinfo, tree niters, |
0f26839a RS |
1903 | tree *niters_vector_ptr, tree *step_vector_ptr, |
1904 | bool niters_no_overflow) | |
ebfd146a | 1905 | { |
a5e3d614 | 1906 | tree ni_minus_gap, var; |
0f26839a | 1907 | tree niters_vector, step_vector, type = TREE_TYPE (niters); |
d9f21f6a | 1908 | poly_uint64 vf = LOOP_VINFO_VECT_FACTOR (loop_vinfo); |
a5e3d614 | 1909 | edge pe = loop_preheader_edge (LOOP_VINFO_LOOP (loop_vinfo)); |
0f26839a | 1910 | tree log_vf = NULL_TREE; |
a5e3d614 BC |
1911 | |
1912 | /* If epilogue loop is required because of data accesses with gaps, we | |
1913 | subtract one iteration from the total number of iterations here for | |
1914 | correct calculation of RATIO. */ | |
1915 | if (LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo)) | |
1916 | { | |
7078979b BC |
1917 | ni_minus_gap = fold_build2 (MINUS_EXPR, type, niters, |
1918 | build_one_cst (type)); | |
a5e3d614 BC |
1919 | if (!is_gimple_val (ni_minus_gap)) |
1920 | { | |
7078979b | 1921 | var = create_tmp_var (type, "ni_gap"); |
a5e3d614 BC |
1922 | gimple *stmts = NULL; |
1923 | ni_minus_gap = force_gimple_operand (ni_minus_gap, &stmts, | |
1924 | true, var); | |
1925 | gsi_insert_seq_on_edge_immediate (pe, stmts); | |
1926 | } | |
1927 | } | |
1928 | else | |
1929 | ni_minus_gap = niters; | |
1930 | ||
d9f21f6a | 1931 | unsigned HOST_WIDE_INT const_vf; |
7cfb4d93 RS |
1932 | if (vf.is_constant (&const_vf) |
1933 | && !LOOP_VINFO_FULLY_MASKED_P (loop_vinfo)) | |
0f26839a RS |
1934 | { |
1935 | /* Create: niters >> log2(vf) */ | |
1936 | /* If it's known that niters == number of latch executions + 1 doesn't | |
1937 | overflow, we can generate niters >> log2(vf); otherwise we generate | |
1938 | (niters - vf) >> log2(vf) + 1 by using the fact that we know ratio | |
1939 | will be at least one. */ | |
d9f21f6a | 1940 | log_vf = build_int_cst (type, exact_log2 (const_vf)); |
0f26839a RS |
1941 | if (niters_no_overflow) |
1942 | niters_vector = fold_build2 (RSHIFT_EXPR, type, ni_minus_gap, log_vf); | |
1943 | else | |
1944 | niters_vector | |
1945 | = fold_build2 (PLUS_EXPR, type, | |
1946 | fold_build2 (RSHIFT_EXPR, type, | |
1947 | fold_build2 (MINUS_EXPR, type, | |
1948 | ni_minus_gap, | |
1949 | build_int_cst (type, vf)), | |
1950 | log_vf), | |
1951 | build_int_cst (type, 1)); | |
1952 | step_vector = build_one_cst (type); | |
1953 | } | |
a5e3d614 | 1954 | else |
0f26839a RS |
1955 | { |
1956 | niters_vector = ni_minus_gap; | |
1957 | step_vector = build_int_cst (type, vf); | |
1958 | } | |
a5e3d614 BC |
1959 | |
1960 | if (!is_gimple_val (niters_vector)) | |
1961 | { | |
7078979b BC |
1962 | var = create_tmp_var (type, "bnd"); |
1963 | gimple_seq stmts = NULL; | |
a5e3d614 BC |
1964 | niters_vector = force_gimple_operand (niters_vector, &stmts, true, var); |
1965 | gsi_insert_seq_on_edge_immediate (pe, stmts); | |
7078979b BC |
1966 | /* Peeling algorithm guarantees that vector loop bound is at least ONE, |
1967 | we set range information to make niters analyzer's life easier. */ | |
0f26839a | 1968 | if (stmts != NULL && log_vf) |
8e6cdc90 RS |
1969 | set_range_info (niters_vector, VR_RANGE, |
1970 | wi::to_wide (build_int_cst (type, 1)), | |
1971 | wi::to_wide (fold_build2 (RSHIFT_EXPR, type, | |
1972 | TYPE_MAX_VALUE (type), | |
1973 | log_vf))); | |
a5e3d614 BC |
1974 | } |
1975 | *niters_vector_ptr = niters_vector; | |
0f26839a | 1976 | *step_vector_ptr = step_vector; |
a5e3d614 BC |
1977 | |
1978 | return; | |
1979 | } | |
1980 | ||
1981 | /* Given NITERS_VECTOR which is the number of iterations for vectorized | |
1982 | loop specified by LOOP_VINFO after vectorization, compute the number | |
1983 | of iterations before vectorization (niters_vector * vf) and store it | |
1984 | to NITERS_VECTOR_MULT_VF_PTR. */ | |
1985 | ||
1986 | static void | |
1987 | vect_gen_vector_loop_niters_mult_vf (loop_vec_info loop_vinfo, | |
1988 | tree niters_vector, | |
1989 | tree *niters_vector_mult_vf_ptr) | |
1990 | { | |
d9f21f6a RS |
1991 | /* We should be using a step_vector of VF if VF is variable. */ |
1992 | int vf = LOOP_VINFO_VECT_FACTOR (loop_vinfo).to_constant (); | |
ebfd146a | 1993 | struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo); |
a5e3d614 BC |
1994 | tree type = TREE_TYPE (niters_vector); |
1995 | tree log_vf = build_int_cst (type, exact_log2 (vf)); | |
1996 | basic_block exit_bb = single_exit (loop)->dest; | |
ebfd146a | 1997 | |
a5e3d614 BC |
1998 | gcc_assert (niters_vector_mult_vf_ptr != NULL); |
1999 | tree niters_vector_mult_vf = fold_build2 (LSHIFT_EXPR, type, | |
2000 | niters_vector, log_vf); | |
2001 | if (!is_gimple_val (niters_vector_mult_vf)) | |
2002 | { | |
2003 | tree var = create_tmp_var (type, "niters_vector_mult_vf"); | |
2004 | gimple_seq stmts = NULL; | |
2005 | niters_vector_mult_vf = force_gimple_operand (niters_vector_mult_vf, | |
2006 | &stmts, true, var); | |
2007 | gimple_stmt_iterator gsi = gsi_start_bb (exit_bb); | |
2008 | gsi_insert_seq_before (&gsi, stmts, GSI_SAME_STMT); | |
2009 | } | |
2010 | *niters_vector_mult_vf_ptr = niters_vector_mult_vf; | |
2011 | } | |
2012 | ||
2013 | /* Function slpeel_tree_duplicate_loop_to_edge_cfg duplciates FIRST/SECOND | |
2014 | from SECOND/FIRST and puts it at the original loop's preheader/exit | |
2015 | edge, the two loops are arranged as below: | |
2016 | ||
2017 | preheader_a: | |
2018 | first_loop: | |
2019 | header_a: | |
2020 | i_1 = PHI<i_0, i_2>; | |
2021 | ... | |
2022 | i_2 = i_1 + 1; | |
2023 | if (cond_a) | |
2024 | goto latch_a; | |
2025 | else | |
2026 | goto between_bb; | |
2027 | latch_a: | |
2028 | goto header_a; | |
2029 | ||
2030 | between_bb: | |
2031 | ;; i_x = PHI<i_2>; ;; LCSSA phi node to be created for FIRST, | |
2032 | ||
2033 | second_loop: | |
2034 | header_b: | |
2035 | i_3 = PHI<i_0, i_4>; ;; Use of i_0 to be replaced with i_x, | |
2036 | or with i_2 if no LCSSA phi is created | |
2037 | under condition of CREATE_LCSSA_FOR_IV_PHIS. | |
2038 | ... | |
2039 | i_4 = i_3 + 1; | |
2040 | if (cond_b) | |
2041 | goto latch_b; | |
2042 | else | |
2043 | goto exit_bb; | |
2044 | latch_b: | |
2045 | goto header_b; | |
2046 | ||
2047 | exit_bb: | |
2048 | ||
2049 | This function creates loop closed SSA for the first loop; update the | |
2050 | second loop's PHI nodes by replacing argument on incoming edge with the | |
2051 | result of newly created lcssa PHI nodes. IF CREATE_LCSSA_FOR_IV_PHIS | |
2052 | is false, Loop closed ssa phis will only be created for non-iv phis for | |
2053 | the first loop. | |
2054 | ||
2055 | This function assumes exit bb of the first loop is preheader bb of the | |
2056 | second loop, i.e, between_bb in the example code. With PHIs updated, | |
2057 | the second loop will execute rest iterations of the first. */ | |
ebfd146a | 2058 | |
a5e3d614 BC |
2059 | static void |
2060 | slpeel_update_phi_nodes_for_loops (loop_vec_info loop_vinfo, | |
2061 | struct loop *first, struct loop *second, | |
2062 | bool create_lcssa_for_iv_phis) | |
2063 | { | |
2064 | gphi_iterator gsi_update, gsi_orig; | |
2065 | struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo); | |
2066 | ||
2067 | edge first_latch_e = EDGE_SUCC (first->latch, 0); | |
2068 | edge second_preheader_e = loop_preheader_edge (second); | |
2069 | basic_block between_bb = single_exit (first)->dest; | |
2070 | ||
2071 | gcc_assert (between_bb == second_preheader_e->src); | |
2072 | gcc_assert (single_pred_p (between_bb) && single_succ_p (between_bb)); | |
2073 | /* Either the first loop or the second is the loop to be vectorized. */ | |
2074 | gcc_assert (loop == first || loop == second); | |
2075 | ||
2076 | for (gsi_orig = gsi_start_phis (first->header), | |
2077 | gsi_update = gsi_start_phis (second->header); | |
2078 | !gsi_end_p (gsi_orig) && !gsi_end_p (gsi_update); | |
2079 | gsi_next (&gsi_orig), gsi_next (&gsi_update)) | |
2080 | { | |
2081 | gphi *orig_phi = gsi_orig.phi (); | |
2082 | gphi *update_phi = gsi_update.phi (); | |
2083 | ||
2084 | tree arg = PHI_ARG_DEF_FROM_EDGE (orig_phi, first_latch_e); | |
2085 | /* Generate lcssa PHI node for the first loop. */ | |
2086 | gphi *vect_phi = (loop == first) ? orig_phi : update_phi; | |
2087 | if (create_lcssa_for_iv_phis || !iv_phi_p (vect_phi)) | |
2088 | { | |
2089 | tree new_res = copy_ssa_name (PHI_RESULT (orig_phi)); | |
2090 | gphi *lcssa_phi = create_phi_node (new_res, between_bb); | |
2091 | add_phi_arg (lcssa_phi, arg, single_exit (first), UNKNOWN_LOCATION); | |
2092 | arg = new_res; | |
2093 | } | |
2094 | ||
2095 | /* Update PHI node in the second loop by replacing arg on the loop's | |
2096 | incoming edge. */ | |
2097 | adjust_phi_and_debug_stmts (update_phi, second_preheader_e, arg); | |
2098 | } | |
2099 | } | |
2100 | ||
2101 | /* Function slpeel_add_loop_guard adds guard skipping from the beginning | |
2102 | of SKIP_LOOP to the beginning of UPDATE_LOOP. GUARD_EDGE and MERGE_EDGE | |
2103 | are two pred edges of the merge point before UPDATE_LOOP. The two loops | |
2104 | appear like below: | |
2105 | ||
2106 | guard_bb: | |
2107 | if (cond) | |
2108 | goto merge_bb; | |
2109 | else | |
2110 | goto skip_loop; | |
2111 | ||
2112 | skip_loop: | |
2113 | header_a: | |
2114 | i_1 = PHI<i_0, i_2>; | |
2115 | ... | |
2116 | i_2 = i_1 + 1; | |
2117 | if (cond_a) | |
2118 | goto latch_a; | |
2119 | else | |
2120 | goto exit_a; | |
2121 | latch_a: | |
2122 | goto header_a; | |
2123 | ||
2124 | exit_a: | |
2125 | i_5 = PHI<i_2>; | |
2126 | ||
2127 | merge_bb: | |
2128 | ;; PHI (i_x = PHI<i_0, i_5>) to be created at merge point. | |
2129 | ||
2130 | update_loop: | |
2131 | header_b: | |
2132 | i_3 = PHI<i_5, i_4>; ;; Use of i_5 to be replaced with i_x. | |
2133 | ... | |
2134 | i_4 = i_3 + 1; | |
2135 | if (cond_b) | |
2136 | goto latch_b; | |
2137 | else | |
2138 | goto exit_bb; | |
2139 | latch_b: | |
2140 | goto header_b; | |
2141 | ||
2142 | exit_bb: | |
2143 | ||
2144 | This function creates PHI nodes at merge_bb and replaces the use of i_5 | |
2145 | in the update_loop's PHI node with the result of new PHI result. */ | |
2146 | ||
2147 | static void | |
2148 | slpeel_update_phi_nodes_for_guard1 (struct loop *skip_loop, | |
2149 | struct loop *update_loop, | |
2150 | edge guard_edge, edge merge_edge) | |
2151 | { | |
2152 | source_location merge_loc, guard_loc; | |
2153 | edge orig_e = loop_preheader_edge (skip_loop); | |
2154 | edge update_e = loop_preheader_edge (update_loop); | |
2155 | gphi_iterator gsi_orig, gsi_update; | |
2156 | ||
2157 | for ((gsi_orig = gsi_start_phis (skip_loop->header), | |
2158 | gsi_update = gsi_start_phis (update_loop->header)); | |
2159 | !gsi_end_p (gsi_orig) && !gsi_end_p (gsi_update); | |
2160 | gsi_next (&gsi_orig), gsi_next (&gsi_update)) | |
2161 | { | |
2162 | gphi *orig_phi = gsi_orig.phi (); | |
2163 | gphi *update_phi = gsi_update.phi (); | |
2164 | ||
2165 | /* Generate new phi node at merge bb of the guard. */ | |
2166 | tree new_res = copy_ssa_name (PHI_RESULT (orig_phi)); | |
2167 | gphi *new_phi = create_phi_node (new_res, guard_edge->dest); | |
2168 | ||
2169 | /* Merge bb has two incoming edges: GUARD_EDGE and MERGE_EDGE. Set the | |
2170 | args in NEW_PHI for these edges. */ | |
2171 | tree merge_arg = PHI_ARG_DEF_FROM_EDGE (update_phi, update_e); | |
2172 | tree guard_arg = PHI_ARG_DEF_FROM_EDGE (orig_phi, orig_e); | |
2173 | merge_loc = gimple_phi_arg_location_from_edge (update_phi, update_e); | |
2174 | guard_loc = gimple_phi_arg_location_from_edge (orig_phi, orig_e); | |
2175 | add_phi_arg (new_phi, merge_arg, merge_edge, merge_loc); | |
2176 | add_phi_arg (new_phi, guard_arg, guard_edge, guard_loc); | |
2177 | ||
2178 | /* Update phi in UPDATE_PHI. */ | |
2179 | adjust_phi_and_debug_stmts (update_phi, update_e, new_res); | |
2180 | } | |
2181 | } | |
2182 | ||
2183 | /* LCSSA_PHI is a lcssa phi of EPILOG loop which is copied from LOOP, | |
2184 | this function searches for the corresponding lcssa phi node in exit | |
2185 | bb of LOOP. If it is found, return the phi result; otherwise return | |
2186 | NULL. */ | |
2187 | ||
2188 | static tree | |
2189 | find_guard_arg (struct loop *loop, struct loop *epilog ATTRIBUTE_UNUSED, | |
2190 | gphi *lcssa_phi) | |
2191 | { | |
2192 | gphi_iterator gsi; | |
2193 | edge e = single_exit (loop); | |
2194 | ||
2195 | gcc_assert (single_pred_p (e->dest)); | |
2196 | for (gsi = gsi_start_phis (e->dest); !gsi_end_p (gsi); gsi_next (&gsi)) | |
2197 | { | |
2198 | gphi *phi = gsi.phi (); | |
2199 | if (operand_equal_p (PHI_ARG_DEF (phi, 0), | |
2200 | PHI_ARG_DEF (lcssa_phi, 0), 0)) | |
2201 | return PHI_RESULT (phi); | |
2202 | } | |
2203 | return NULL_TREE; | |
2204 | } | |
2205 | ||
2206 | /* LOOP and EPILOG are two consecutive loops in CFG and EPILOG is copied | |
2207 | from LOOP. Function slpeel_add_loop_guard adds guard skipping from a | |
2208 | point between the two loops to the end of EPILOG. Edges GUARD_EDGE | |
2209 | and MERGE_EDGE are the two pred edges of merge_bb at the end of EPILOG. | |
2210 | The CFG looks like: | |
2211 | ||
2212 | loop: | |
2213 | header_a: | |
2214 | i_1 = PHI<i_0, i_2>; | |
2215 | ... | |
2216 | i_2 = i_1 + 1; | |
2217 | if (cond_a) | |
2218 | goto latch_a; | |
2219 | else | |
2220 | goto exit_a; | |
2221 | latch_a: | |
2222 | goto header_a; | |
2223 | ||
2224 | exit_a: | |
2225 | ||
2226 | guard_bb: | |
2227 | if (cond) | |
2228 | goto merge_bb; | |
2229 | else | |
2230 | goto epilog_loop; | |
2231 | ||
2232 | ;; fall_through_bb | |
2233 | ||
2234 | epilog_loop: | |
2235 | header_b: | |
2236 | i_3 = PHI<i_2, i_4>; | |
2237 | ... | |
2238 | i_4 = i_3 + 1; | |
2239 | if (cond_b) | |
2240 | goto latch_b; | |
2241 | else | |
2242 | goto merge_bb; | |
2243 | latch_b: | |
2244 | goto header_b; | |
2245 | ||
2246 | merge_bb: | |
2247 | ; PHI node (i_y = PHI<i_2, i_4>) to be created at merge point. | |
2248 | ||
2249 | exit_bb: | |
2250 | i_x = PHI<i_4>; ;Use of i_4 to be replaced with i_y in merge_bb. | |
2251 | ||
2252 | For each name used out side EPILOG (i.e - for each name that has a lcssa | |
2253 | phi in exit_bb) we create a new PHI in merge_bb. The new PHI has two | |
2254 | args corresponding to GUARD_EDGE and MERGE_EDGE. Arg for MERGE_EDGE is | |
2255 | the arg of the original PHI in exit_bb, arg for GUARD_EDGE is defined | |
2256 | by LOOP and is found in the exit bb of LOOP. Arg of the original PHI | |
2257 | in exit_bb will also be updated. */ | |
2258 | ||
2259 | static void | |
2260 | slpeel_update_phi_nodes_for_guard2 (struct loop *loop, struct loop *epilog, | |
2261 | edge guard_edge, edge merge_edge) | |
2262 | { | |
2263 | gphi_iterator gsi; | |
2264 | basic_block merge_bb = guard_edge->dest; | |
2265 | ||
2266 | gcc_assert (single_succ_p (merge_bb)); | |
2267 | edge e = single_succ_edge (merge_bb); | |
2268 | basic_block exit_bb = e->dest; | |
2269 | gcc_assert (single_pred_p (exit_bb)); | |
2270 | gcc_assert (single_pred (exit_bb) == single_exit (epilog)->dest); | |
2271 | ||
2272 | for (gsi = gsi_start_phis (exit_bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
2273 | { | |
2274 | gphi *update_phi = gsi.phi (); | |
2275 | tree old_arg = PHI_ARG_DEF (update_phi, 0); | |
2276 | /* This loop-closed-phi actually doesn't represent a use out of the | |
2277 | loop - the phi arg is a constant. */ | |
2278 | if (TREE_CODE (old_arg) != SSA_NAME) | |
2279 | continue; | |
2280 | ||
2281 | tree merge_arg = get_current_def (old_arg); | |
2282 | if (!merge_arg) | |
2283 | merge_arg = old_arg; | |
2284 | ||
2285 | tree guard_arg = find_guard_arg (loop, epilog, update_phi); | |
2286 | /* If the var is live after loop but not a reduction, we simply | |
2287 | use the old arg. */ | |
2288 | if (!guard_arg) | |
2289 | guard_arg = old_arg; | |
2290 | ||
2291 | /* Create new phi node in MERGE_BB: */ | |
2292 | tree new_res = copy_ssa_name (PHI_RESULT (update_phi)); | |
2293 | gphi *merge_phi = create_phi_node (new_res, merge_bb); | |
2294 | ||
2295 | /* MERGE_BB has two incoming edges: GUARD_EDGE and MERGE_EDGE, Set | |
2296 | the two PHI args in merge_phi for these edges. */ | |
2297 | add_phi_arg (merge_phi, merge_arg, merge_edge, UNKNOWN_LOCATION); | |
2298 | add_phi_arg (merge_phi, guard_arg, guard_edge, UNKNOWN_LOCATION); | |
2299 | ||
2300 | /* Update the original phi in exit_bb. */ | |
2301 | adjust_phi_and_debug_stmts (update_phi, e, new_res); | |
2302 | } | |
2303 | } | |
2304 | ||
2305 | /* EPILOG loop is duplicated from the original loop for vectorizing, | |
2306 | the arg of its loop closed ssa PHI needs to be updated. */ | |
2307 | ||
2308 | static void | |
2309 | slpeel_update_phi_nodes_for_lcssa (struct loop *epilog) | |
2310 | { | |
2311 | gphi_iterator gsi; | |
2312 | basic_block exit_bb = single_exit (epilog)->dest; | |
2313 | ||
2314 | gcc_assert (single_pred_p (exit_bb)); | |
2315 | edge e = EDGE_PRED (exit_bb, 0); | |
2316 | for (gsi = gsi_start_phis (exit_bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
2317 | rename_use_op (PHI_ARG_DEF_PTR_FROM_EDGE (gsi.phi (), e)); | |
2318 | } | |
2319 | ||
2320 | /* Function vect_do_peeling. | |
2321 | ||
2322 | Input: | |
2323 | - LOOP_VINFO: Represent a loop to be vectorized, which looks like: | |
2324 | ||
2325 | preheader: | |
2326 | LOOP: | |
2327 | header_bb: | |
2328 | loop_body | |
2329 | if (exit_loop_cond) goto exit_bb | |
2330 | else goto header_bb | |
2331 | exit_bb: | |
2332 | ||
2333 | - NITERS: The number of iterations of the loop. | |
2334 | - NITERSM1: The number of iterations of the loop's latch. | |
2335 | - NITERS_NO_OVERFLOW: No overflow in computing NITERS. | |
2336 | - TH, CHECK_PROFITABILITY: Threshold of niters to vectorize loop if | |
2337 | CHECK_PROFITABILITY is true. | |
2338 | Output: | |
0f26839a | 2339 | - *NITERS_VECTOR and *STEP_VECTOR describe how the main loop should |
7cfb4d93 | 2340 | iterate after vectorization; see vect_set_loop_condition for details. |
0f26839a RS |
2341 | - *NITERS_VECTOR_MULT_VF_VAR is either null or an SSA name that |
2342 | should be set to the number of scalar iterations handled by the | |
2343 | vector loop. The SSA name is only used on exit from the loop. | |
a5e3d614 BC |
2344 | |
2345 | This function peels prolog and epilog from the loop, adds guards skipping | |
2346 | PROLOG and EPILOG for various conditions. As a result, the changed CFG | |
2347 | would look like: | |
2348 | ||
2349 | guard_bb_1: | |
2350 | if (prefer_scalar_loop) goto merge_bb_1 | |
2351 | else goto guard_bb_2 | |
2352 | ||
2353 | guard_bb_2: | |
2354 | if (skip_prolog) goto merge_bb_2 | |
2355 | else goto prolog_preheader | |
2356 | ||
2357 | prolog_preheader: | |
2358 | PROLOG: | |
2359 | prolog_header_bb: | |
2360 | prolog_body | |
2361 | if (exit_prolog_cond) goto prolog_exit_bb | |
2362 | else goto prolog_header_bb | |
2363 | prolog_exit_bb: | |
2364 | ||
2365 | merge_bb_2: | |
2366 | ||
2367 | vector_preheader: | |
2368 | VECTOR LOOP: | |
2369 | vector_header_bb: | |
2370 | vector_body | |
2371 | if (exit_vector_cond) goto vector_exit_bb | |
2372 | else goto vector_header_bb | |
2373 | vector_exit_bb: | |
2374 | ||
2375 | guard_bb_3: | |
2376 | if (skip_epilog) goto merge_bb_3 | |
2377 | else goto epilog_preheader | |
2378 | ||
2379 | merge_bb_1: | |
2380 | ||
2381 | epilog_preheader: | |
2382 | EPILOG: | |
2383 | epilog_header_bb: | |
2384 | epilog_body | |
2385 | if (exit_epilog_cond) goto merge_bb_3 | |
2386 | else goto epilog_header_bb | |
2387 | ||
2388 | merge_bb_3: | |
2389 | ||
2390 | Note this function peels prolog and epilog only if it's necessary, | |
2391 | as well as guards. | |
598eaaa2 | 2392 | Returns created epilogue or NULL. |
a5e3d614 BC |
2393 | |
2394 | TODO: Guard for prefer_scalar_loop should be emitted along with | |
2395 | versioning conditions if loop versioning is needed. */ | |
2396 | ||
598eaaa2 YR |
2397 | |
2398 | struct loop * | |
a5e3d614 | 2399 | vect_do_peeling (loop_vec_info loop_vinfo, tree niters, tree nitersm1, |
0f26839a RS |
2400 | tree *niters_vector, tree *step_vector, |
2401 | tree *niters_vector_mult_vf_var, int th, | |
2402 | bool check_profitability, bool niters_no_overflow) | |
a5e3d614 BC |
2403 | { |
2404 | edge e, guard_e; | |
2405 | tree type = TREE_TYPE (niters), guard_cond; | |
2406 | basic_block guard_bb, guard_to; | |
357067f2 | 2407 | profile_probability prob_prolog, prob_vector, prob_epilog; |
d9f21f6a RS |
2408 | int bound_prolog = 0; |
2409 | poly_uint64 bound_scalar = 0; | |
2410 | int estimated_vf; | |
535e7c11 RS |
2411 | int prolog_peeling = 0; |
2412 | if (!vect_use_loop_mask_for_alignment_p (loop_vinfo)) | |
2413 | prolog_peeling = LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo); | |
a5e3d614 BC |
2414 | bool epilog_peeling = (LOOP_VINFO_PEELING_FOR_NITER (loop_vinfo) |
2415 | || LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo)); | |
2416 | ||
2417 | if (!prolog_peeling && !epilog_peeling) | |
598eaaa2 | 2418 | return NULL; |
a5e3d614 | 2419 | |
357067f2 | 2420 | prob_vector = profile_probability::guessed_always ().apply_scale (9, 10); |
d9f21f6a RS |
2421 | estimated_vf = vect_vf_for_cost (loop_vinfo); |
2422 | if (estimated_vf == 2) | |
2423 | estimated_vf = 3; | |
357067f2 | 2424 | prob_prolog = prob_epilog = profile_probability::guessed_always () |
d9f21f6a RS |
2425 | .apply_scale (estimated_vf - 1, estimated_vf); |
2426 | poly_uint64 vf = LOOP_VINFO_VECT_FACTOR (loop_vinfo); | |
a5e3d614 | 2427 | |
598eaaa2 | 2428 | struct loop *prolog, *epilog = NULL, *loop = LOOP_VINFO_LOOP (loop_vinfo); |
a5e3d614 | 2429 | struct loop *first_loop = loop; |
3e907b90 | 2430 | bool irred_flag = loop_preheader_edge (loop)->flags & EDGE_IRREDUCIBLE_LOOP; |
a5e3d614 BC |
2431 | create_lcssa_for_virtual_phi (loop); |
2432 | update_ssa (TODO_update_ssa_only_virtuals); | |
2433 | ||
36f52e8f | 2434 | if (MAY_HAVE_DEBUG_BIND_STMTS) |
a5e3d614 BC |
2435 | { |
2436 | gcc_assert (!adjust_vec.exists ()); | |
2437 | adjust_vec.create (32); | |
2438 | } | |
ebfd146a IR |
2439 | initialize_original_copy_tables (); |
2440 | ||
a5e3d614 BC |
2441 | /* Prolog loop may be skipped. */ |
2442 | bool skip_prolog = (prolog_peeling != 0); | |
704c28ee BC |
2443 | /* Skip to epilog if scalar loop may be preferred. It's only needed |
2444 | when we peel for epilog loop and when it hasn't been checked with | |
2445 | loop versioning. */ | |
d9f21f6a RS |
2446 | bool skip_vector = ((!LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo) |
2447 | && !LOOP_REQUIRES_VERSIONING (loop_vinfo)) | |
2448 | || !vf.is_constant ()); | |
a5e3d614 BC |
2449 | /* Epilog loop must be executed if the number of iterations for epilog |
2450 | loop is known at compile time, otherwise we need to add a check at | |
2451 | the end of vector loop and skip to the end of epilog loop. */ | |
2452 | bool skip_epilog = (prolog_peeling < 0 | |
d9f21f6a RS |
2453 | || !LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo) |
2454 | || !vf.is_constant ()); | |
a5e3d614 BC |
2455 | /* PEELING_FOR_GAPS is special because epilog loop must be executed. */ |
2456 | if (LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo)) | |
2457 | skip_epilog = false; | |
2458 | ||
2459 | /* Record the anchor bb at which guard should be placed if scalar loop | |
2460 | may be preferred. */ | |
2461 | basic_block anchor = loop_preheader_edge (loop)->src; | |
2462 | if (skip_vector) | |
25c99850 BC |
2463 | { |
2464 | split_edge (loop_preheader_edge (loop)); | |
2465 | ||
2466 | /* Due to the order in which we peel prolog and epilog, we first | |
2467 | propagate probability to the whole loop. The purpose is to | |
2468 | avoid adjusting probabilities of both prolog and vector loops | |
2469 | separately. Note in this case, the probability of epilog loop | |
2470 | needs to be scaled back later. */ | |
2471 | basic_block bb_before_loop = loop_preheader_edge (loop)->src; | |
357067f2 | 2472 | if (prob_vector.initialized_p ()) |
d9f21f6a RS |
2473 | { |
2474 | scale_bbs_frequencies (&bb_before_loop, 1, prob_vector); | |
2475 | scale_loop_profile (loop, prob_vector, 0); | |
2476 | } | |
25c99850 | 2477 | } |
a5e3d614 BC |
2478 | |
2479 | tree niters_prolog = build_int_cst (type, 0); | |
2480 | source_location loop_loc = find_loop_location (loop); | |
2481 | struct loop *scalar_loop = LOOP_VINFO_SCALAR_LOOP (loop_vinfo); | |
2482 | if (prolog_peeling) | |
5d2eb24b | 2483 | { |
a5e3d614 BC |
2484 | e = loop_preheader_edge (loop); |
2485 | if (!slpeel_can_duplicate_loop_p (loop, e)) | |
5d2eb24b | 2486 | { |
a5e3d614 BC |
2487 | dump_printf_loc (MSG_MISSED_OPTIMIZATION, loop_loc, |
2488 | "loop can't be duplicated to preheader edge.\n"); | |
2489 | gcc_unreachable (); | |
2490 | } | |
2491 | /* Peel prolog and put it on preheader edge of loop. */ | |
2492 | prolog = slpeel_tree_duplicate_loop_to_edge_cfg (loop, scalar_loop, e); | |
2493 | if (!prolog) | |
2494 | { | |
2495 | dump_printf_loc (MSG_MISSED_OPTIMIZATION, loop_loc, | |
2496 | "slpeel_tree_duplicate_loop_to_edge_cfg failed.\n"); | |
2497 | gcc_unreachable (); | |
2498 | } | |
2499 | slpeel_update_phi_nodes_for_loops (loop_vinfo, prolog, loop, true); | |
2500 | first_loop = prolog; | |
2501 | reset_original_copy_tables (); | |
2502 | ||
2503 | /* Generate and update the number of iterations for prolog loop. */ | |
2504 | niters_prolog = vect_gen_prolog_loop_niters (loop_vinfo, anchor, | |
2505 | &bound_prolog); | |
0f26839a | 2506 | tree step_prolog = build_one_cst (TREE_TYPE (niters_prolog)); |
7cfb4d93 RS |
2507 | vect_set_loop_condition (prolog, NULL, niters_prolog, |
2508 | step_prolog, NULL_TREE, false); | |
a5e3d614 BC |
2509 | |
2510 | /* Skip the prolog loop. */ | |
2511 | if (skip_prolog) | |
2512 | { | |
2513 | guard_cond = fold_build2 (EQ_EXPR, boolean_type_node, | |
2514 | niters_prolog, build_int_cst (type, 0)); | |
2515 | guard_bb = loop_preheader_edge (prolog)->src; | |
25c99850 | 2516 | basic_block bb_after_prolog = loop_preheader_edge (loop)->src; |
a5e3d614 BC |
2517 | guard_to = split_edge (loop_preheader_edge (loop)); |
2518 | guard_e = slpeel_add_loop_guard (guard_bb, guard_cond, | |
2519 | guard_to, guard_bb, | |
357067f2 | 2520 | prob_prolog.invert (), |
3e907b90 | 2521 | irred_flag); |
a5e3d614 BC |
2522 | e = EDGE_PRED (guard_to, 0); |
2523 | e = (e != guard_e ? e : EDGE_PRED (guard_to, 1)); | |
2524 | slpeel_update_phi_nodes_for_guard1 (prolog, loop, guard_e, e); | |
25c99850 | 2525 | |
af2bbc51 JH |
2526 | scale_bbs_frequencies (&bb_after_prolog, 1, prob_prolog); |
2527 | scale_loop_profile (prolog, prob_prolog, bound_prolog); | |
a5e3d614 BC |
2528 | } |
2529 | /* Update init address of DRs. */ | |
535e7c11 | 2530 | vect_update_inits_of_drs (loop_vinfo, niters_prolog, PLUS_EXPR); |
a5e3d614 BC |
2531 | /* Update niters for vector loop. */ |
2532 | LOOP_VINFO_NITERS (loop_vinfo) | |
2533 | = fold_build2 (MINUS_EXPR, type, niters, niters_prolog); | |
2534 | LOOP_VINFO_NITERSM1 (loop_vinfo) | |
2535 | = fold_build2 (MINUS_EXPR, type, | |
2536 | LOOP_VINFO_NITERSM1 (loop_vinfo), niters_prolog); | |
7078979b BC |
2537 | bool new_var_p = false; |
2538 | niters = vect_build_loop_niters (loop_vinfo, &new_var_p); | |
2539 | /* It's guaranteed that vector loop bound before vectorization is at | |
2540 | least VF, so set range information for newly generated var. */ | |
2541 | if (new_var_p) | |
2542 | set_range_info (niters, VR_RANGE, | |
8e6cdc90 RS |
2543 | wi::to_wide (build_int_cst (type, vf)), |
2544 | wi::to_wide (TYPE_MAX_VALUE (type))); | |
a5e3d614 | 2545 | |
cbb22e61 BC |
2546 | /* Prolog iterates at most bound_prolog times, latch iterates at |
2547 | most bound_prolog - 1 times. */ | |
2548 | record_niter_bound (prolog, bound_prolog - 1, false, true); | |
a5e3d614 BC |
2549 | delete_update_ssa (); |
2550 | adjust_vec_debug_stmts (); | |
2551 | scev_reset (); | |
5d2eb24b IR |
2552 | } |
2553 | ||
a5e3d614 BC |
2554 | if (epilog_peeling) |
2555 | { | |
2556 | e = single_exit (loop); | |
2557 | if (!slpeel_can_duplicate_loop_p (loop, e)) | |
2558 | { | |
2559 | dump_printf_loc (MSG_MISSED_OPTIMIZATION, loop_loc, | |
2560 | "loop can't be duplicated to exit edge.\n"); | |
2561 | gcc_unreachable (); | |
2562 | } | |
2563 | /* Peel epilog and put it on exit edge of loop. */ | |
2564 | epilog = slpeel_tree_duplicate_loop_to_edge_cfg (loop, scalar_loop, e); | |
2565 | if (!epilog) | |
2566 | { | |
2567 | dump_printf_loc (MSG_MISSED_OPTIMIZATION, loop_loc, | |
2568 | "slpeel_tree_duplicate_loop_to_edge_cfg failed.\n"); | |
2569 | gcc_unreachable (); | |
2570 | } | |
2571 | slpeel_update_phi_nodes_for_loops (loop_vinfo, loop, epilog, false); | |
2572 | ||
2573 | /* Scalar version loop may be preferred. In this case, add guard | |
2574 | and skip to epilog. Note this only happens when the number of | |
2575 | iterations of loop is unknown at compile time, otherwise this | |
2576 | won't be vectorized. */ | |
2577 | if (skip_vector) | |
2578 | { | |
cbb22e61 BC |
2579 | /* Additional epilogue iteration is peeled if gap exists. */ |
2580 | bool peel_for_gaps = LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo); | |
a5e3d614 | 2581 | tree t = vect_gen_scalar_loop_niters (niters_prolog, prolog_peeling, |
cbb22e61 BC |
2582 | bound_prolog, |
2583 | peel_for_gaps ? vf : vf - 1, | |
2584 | th, &bound_scalar, | |
a5e3d614 | 2585 | check_profitability); |
cbb22e61 BC |
2586 | /* Build guard against NITERSM1 since NITERS may overflow. */ |
2587 | guard_cond = fold_build2 (LT_EXPR, boolean_type_node, nitersm1, t); | |
a5e3d614 BC |
2588 | guard_bb = anchor; |
2589 | guard_to = split_edge (loop_preheader_edge (epilog)); | |
2590 | guard_e = slpeel_add_loop_guard (guard_bb, guard_cond, | |
2591 | guard_to, guard_bb, | |
357067f2 | 2592 | prob_vector.invert (), |
3e907b90 | 2593 | irred_flag); |
a5e3d614 BC |
2594 | e = EDGE_PRED (guard_to, 0); |
2595 | e = (e != guard_e ? e : EDGE_PRED (guard_to, 1)); | |
2596 | slpeel_update_phi_nodes_for_guard1 (first_loop, epilog, guard_e, e); | |
25c99850 BC |
2597 | |
2598 | /* Simply propagate profile info from guard_bb to guard_to which is | |
2599 | a merge point of control flow. */ | |
25c99850 | 2600 | guard_to->count = guard_bb->count; |
00fa28d1 | 2601 | |
af2bbc51 JH |
2602 | /* Scale probability of epilog loop back. |
2603 | FIXME: We should avoid scaling down and back up. Profile may | |
2604 | get lost if we scale down to 0. */ | |
10ea2672 | 2605 | basic_block *bbs = get_loop_body (epilog); |
00fa28d1 JH |
2606 | for (unsigned int i = 0; i < epilog->num_nodes; i++) |
2607 | bbs[i]->count = bbs[i]->count.apply_scale | |
2608 | (bbs[i]->count, | |
2609 | bbs[i]->count.apply_probability | |
2610 | (prob_vector)); | |
af2bbc51 | 2611 | free (bbs); |
a5e3d614 | 2612 | } |
ebfd146a | 2613 | |
25c99850 | 2614 | basic_block bb_before_epilog = loop_preheader_edge (epilog)->src; |
a5e3d614 BC |
2615 | tree niters_vector_mult_vf; |
2616 | /* If loop is peeled for non-zero constant times, now niters refers to | |
2617 | orig_niters - prolog_peeling, it won't overflow even the orig_niters | |
2618 | overflows. */ | |
2619 | niters_no_overflow |= (prolog_peeling > 0); | |
2620 | vect_gen_vector_loop_niters (loop_vinfo, niters, | |
0f26839a RS |
2621 | niters_vector, step_vector, |
2622 | niters_no_overflow); | |
2623 | if (!integer_onep (*step_vector)) | |
2624 | { | |
2625 | /* On exit from the loop we will have an easy way of calcalating | |
2626 | NITERS_VECTOR / STEP * STEP. Install a dummy definition | |
2627 | until then. */ | |
2628 | niters_vector_mult_vf = make_ssa_name (TREE_TYPE (*niters_vector)); | |
2629 | SSA_NAME_DEF_STMT (niters_vector_mult_vf) = gimple_build_nop (); | |
2630 | *niters_vector_mult_vf_var = niters_vector_mult_vf; | |
2631 | } | |
2632 | else | |
2633 | vect_gen_vector_loop_niters_mult_vf (loop_vinfo, *niters_vector, | |
2634 | &niters_vector_mult_vf); | |
a5e3d614 BC |
2635 | /* Update IVs of original loop as if they were advanced by |
2636 | niters_vector_mult_vf steps. */ | |
2637 | gcc_checking_assert (vect_can_advance_ivs_p (loop_vinfo)); | |
2638 | edge update_e = skip_vector ? e : loop_preheader_edge (epilog); | |
2639 | vect_update_ivs_after_vectorizer (loop_vinfo, niters_vector_mult_vf, | |
2640 | update_e); | |
2641 | ||
2642 | if (skip_epilog) | |
2643 | { | |
2644 | guard_cond = fold_build2 (EQ_EXPR, boolean_type_node, | |
2645 | niters, niters_vector_mult_vf); | |
2646 | guard_bb = single_exit (loop)->dest; | |
2647 | guard_to = split_edge (single_exit (epilog)); | |
2648 | guard_e = slpeel_add_loop_guard (guard_bb, guard_cond, guard_to, | |
2649 | skip_vector ? anchor : guard_bb, | |
357067f2 | 2650 | prob_epilog.invert (), |
3e907b90 | 2651 | irred_flag); |
a5e3d614 BC |
2652 | slpeel_update_phi_nodes_for_guard2 (loop, epilog, guard_e, |
2653 | single_exit (epilog)); | |
25c99850 BC |
2654 | /* Only need to handle basic block before epilog loop if it's not |
2655 | the guard_bb, which is the case when skip_vector is true. */ | |
2656 | if (guard_bb != bb_before_epilog) | |
2657 | { | |
357067f2 | 2658 | prob_epilog = prob_vector * prob_epilog + prob_vector.invert (); |
25c99850 | 2659 | |
af2bbc51 | 2660 | scale_bbs_frequencies (&bb_before_epilog, 1, prob_epilog); |
25c99850 | 2661 | } |
d9f21f6a | 2662 | scale_loop_profile (epilog, prob_epilog, 0); |
a5e3d614 BC |
2663 | } |
2664 | else | |
2665 | slpeel_update_phi_nodes_for_lcssa (epilog); | |
ebfd146a | 2666 | |
d9f21f6a RS |
2667 | unsigned HOST_WIDE_INT bound1, bound2; |
2668 | if (vf.is_constant (&bound1) && bound_scalar.is_constant (&bound2)) | |
2669 | { | |
2670 | bound1 -= LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo) ? 1 : 2; | |
2671 | if (bound2) | |
2672 | /* We share epilog loop with scalar version loop. */ | |
2673 | bound1 = MAX (bound1, bound2 - 1); | |
2674 | record_niter_bound (epilog, bound1, false, true); | |
2675 | } | |
a5e3d614 BC |
2676 | |
2677 | delete_update_ssa (); | |
2678 | adjust_vec_debug_stmts (); | |
2679 | scev_reset (); | |
2680 | } | |
2681 | adjust_vec.release (); | |
ebfd146a | 2682 | free_original_copy_tables (); |
598eaaa2 YR |
2683 | |
2684 | return epilog; | |
ebfd146a IR |
2685 | } |
2686 | ||
01d32b2b BC |
2687 | /* Function vect_create_cond_for_niters_checks. |
2688 | ||
2689 | Create a conditional expression that represents the run-time checks for | |
2690 | loop's niter. The loop is guaranteed to to terminate if the run-time | |
2691 | checks hold. | |
2692 | ||
2693 | Input: | |
2694 | COND_EXPR - input conditional expression. New conditions will be chained | |
2695 | with logical AND operation. If it is NULL, then the function | |
2696 | is used to return the number of alias checks. | |
2697 | LOOP_VINFO - field LOOP_VINFO_MAY_ALIAS_STMTS contains the list of ddrs | |
2698 | to be checked. | |
2699 | ||
2700 | Output: | |
2701 | COND_EXPR - conditional expression. | |
2702 | ||
2703 | The returned COND_EXPR is the conditional expression to be used in the | |
2704 | if statement that controls which version of the loop gets executed at | |
2705 | runtime. */ | |
2706 | ||
2707 | static void | |
2708 | vect_create_cond_for_niters_checks (loop_vec_info loop_vinfo, tree *cond_expr) | |
2709 | { | |
2710 | tree part_cond_expr = LOOP_VINFO_NITERS_ASSUMPTIONS (loop_vinfo); | |
2711 | ||
2712 | if (*cond_expr) | |
2713 | *cond_expr = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, | |
2714 | *cond_expr, part_cond_expr); | |
2715 | else | |
2716 | *cond_expr = part_cond_expr; | |
2717 | } | |
ebfd146a | 2718 | |
9adee305 RS |
2719 | /* Set *COND_EXPR to a tree that is true when both the original *COND_EXPR |
2720 | and PART_COND_EXPR are true. Treat a null *COND_EXPR as "true". */ | |
2721 | ||
2722 | static void | |
2723 | chain_cond_expr (tree *cond_expr, tree part_cond_expr) | |
2724 | { | |
2725 | if (*cond_expr) | |
2726 | *cond_expr = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, | |
2727 | *cond_expr, part_cond_expr); | |
2728 | else | |
2729 | *cond_expr = part_cond_expr; | |
2730 | } | |
2731 | ||
ebfd146a IR |
2732 | /* Function vect_create_cond_for_align_checks. |
2733 | ||
2734 | Create a conditional expression that represents the alignment checks for | |
2735 | all of data references (array element references) whose alignment must be | |
2736 | checked at runtime. | |
2737 | ||
2738 | Input: | |
2739 | COND_EXPR - input conditional expression. New conditions will be chained | |
2740 | with logical AND operation. | |
2741 | LOOP_VINFO - two fields of the loop information are used. | |
2742 | LOOP_VINFO_PTR_MASK is the mask used to check the alignment. | |
2743 | LOOP_VINFO_MAY_MISALIGN_STMTS contains the refs to be checked. | |
2744 | ||
2745 | Output: | |
2746 | COND_EXPR_STMT_LIST - statements needed to construct the conditional | |
2747 | expression. | |
2748 | The returned value is the conditional expression to be used in the if | |
2749 | statement that controls which version of the loop gets executed at runtime. | |
2750 | ||
2751 | The algorithm makes two assumptions: | |
2752 | 1) The number of bytes "n" in a vector is a power of 2. | |
2753 | 2) An address "a" is aligned if a%n is zero and that this | |
2754 | test can be done as a&(n-1) == 0. For example, for 16 | |
2755 | byte vectors the test is a&0xf == 0. */ | |
2756 | ||
2757 | static void | |
2758 | vect_create_cond_for_align_checks (loop_vec_info loop_vinfo, | |
2759 | tree *cond_expr, | |
2760 | gimple_seq *cond_expr_stmt_list) | |
2761 | { | |
355fe088 | 2762 | vec<gimple *> may_misalign_stmts |
ebfd146a | 2763 | = LOOP_VINFO_MAY_MISALIGN_STMTS (loop_vinfo); |
355fe088 | 2764 | gimple *ref_stmt; |
ebfd146a IR |
2765 | int mask = LOOP_VINFO_PTR_MASK (loop_vinfo); |
2766 | tree mask_cst; | |
2767 | unsigned int i; | |
ebfd146a IR |
2768 | tree int_ptrsize_type; |
2769 | char tmp_name[20]; | |
2770 | tree or_tmp_name = NULL_TREE; | |
83d5977e | 2771 | tree and_tmp_name; |
355fe088 | 2772 | gimple *and_stmt; |
ebfd146a IR |
2773 | tree ptrsize_zero; |
2774 | tree part_cond_expr; | |
2775 | ||
2776 | /* Check that mask is one less than a power of 2, i.e., mask is | |
2777 | all zeros followed by all ones. */ | |
2778 | gcc_assert ((mask != 0) && ((mask & (mask+1)) == 0)); | |
2779 | ||
96f9265a | 2780 | int_ptrsize_type = signed_type_for (ptr_type_node); |
ebfd146a IR |
2781 | |
2782 | /* Create expression (mask & (dr_1 || ... || dr_n)) where dr_i is the address | |
2783 | of the first vector of the i'th data reference. */ | |
2784 | ||
9771b263 | 2785 | FOR_EACH_VEC_ELT (may_misalign_stmts, i, ref_stmt) |
ebfd146a IR |
2786 | { |
2787 | gimple_seq new_stmt_list = NULL; | |
2788 | tree addr_base; | |
83d5977e RG |
2789 | tree addr_tmp_name; |
2790 | tree new_or_tmp_name; | |
355fe088 | 2791 | gimple *addr_stmt, *or_stmt; |
d8ba5b19 RG |
2792 | stmt_vec_info stmt_vinfo = vinfo_for_stmt (ref_stmt); |
2793 | tree vectype = STMT_VINFO_VECTYPE (stmt_vinfo); | |
2794 | bool negative = tree_int_cst_compare | |
2795 | (DR_STEP (STMT_VINFO_DATA_REF (stmt_vinfo)), size_zero_node) < 0; | |
2796 | tree offset = negative | |
aad83b7c | 2797 | ? size_int (-TYPE_VECTOR_SUBPARTS (vectype) + 1) : size_zero_node; |
ebfd146a IR |
2798 | |
2799 | /* create: addr_tmp = (int)(address_of_first_vector) */ | |
2800 | addr_base = | |
2801 | vect_create_addr_base_for_vector_ref (ref_stmt, &new_stmt_list, | |
3f5e8a76 | 2802 | offset); |
ebfd146a IR |
2803 | if (new_stmt_list != NULL) |
2804 | gimple_seq_add_seq (cond_expr_stmt_list, new_stmt_list); | |
2805 | ||
83d5977e RG |
2806 | sprintf (tmp_name, "addr2int%d", i); |
2807 | addr_tmp_name = make_temp_ssa_name (int_ptrsize_type, NULL, tmp_name); | |
0d0e4a03 | 2808 | addr_stmt = gimple_build_assign (addr_tmp_name, NOP_EXPR, addr_base); |
ebfd146a IR |
2809 | gimple_seq_add_stmt (cond_expr_stmt_list, addr_stmt); |
2810 | ||
2811 | /* The addresses are OR together. */ | |
2812 | ||
2813 | if (or_tmp_name != NULL_TREE) | |
2814 | { | |
2815 | /* create: or_tmp = or_tmp | addr_tmp */ | |
83d5977e RG |
2816 | sprintf (tmp_name, "orptrs%d", i); |
2817 | new_or_tmp_name = make_temp_ssa_name (int_ptrsize_type, NULL, tmp_name); | |
0d0e4a03 JJ |
2818 | or_stmt = gimple_build_assign (new_or_tmp_name, BIT_IOR_EXPR, |
2819 | or_tmp_name, addr_tmp_name); | |
ebfd146a IR |
2820 | gimple_seq_add_stmt (cond_expr_stmt_list, or_stmt); |
2821 | or_tmp_name = new_or_tmp_name; | |
2822 | } | |
2823 | else | |
2824 | or_tmp_name = addr_tmp_name; | |
2825 | ||
2826 | } /* end for i */ | |
2827 | ||
2828 | mask_cst = build_int_cst (int_ptrsize_type, mask); | |
2829 | ||
2830 | /* create: and_tmp = or_tmp & mask */ | |
83d5977e | 2831 | and_tmp_name = make_temp_ssa_name (int_ptrsize_type, NULL, "andmask"); |
ebfd146a | 2832 | |
0d0e4a03 JJ |
2833 | and_stmt = gimple_build_assign (and_tmp_name, BIT_AND_EXPR, |
2834 | or_tmp_name, mask_cst); | |
ebfd146a IR |
2835 | gimple_seq_add_stmt (cond_expr_stmt_list, and_stmt); |
2836 | ||
2837 | /* Make and_tmp the left operand of the conditional test against zero. | |
2838 | if and_tmp has a nonzero bit then some address is unaligned. */ | |
2839 | ptrsize_zero = build_int_cst (int_ptrsize_type, 0); | |
2840 | part_cond_expr = fold_build2 (EQ_EXPR, boolean_type_node, | |
2841 | and_tmp_name, ptrsize_zero); | |
9adee305 RS |
2842 | chain_cond_expr (cond_expr, part_cond_expr); |
2843 | } | |
2844 | ||
2845 | /* If LOOP_VINFO_CHECK_UNEQUAL_ADDRS contains <A1, B1>, ..., <An, Bn>, | |
2846 | create a tree representation of: (&A1 != &B1) && ... && (&An != &Bn). | |
2847 | Set *COND_EXPR to a tree that is true when both the original *COND_EXPR | |
2848 | and this new condition are true. Treat a null *COND_EXPR as "true". */ | |
2849 | ||
2850 | static void | |
2851 | vect_create_cond_for_unequal_addrs (loop_vec_info loop_vinfo, tree *cond_expr) | |
2852 | { | |
2853 | vec<vec_object_pair> pairs = LOOP_VINFO_CHECK_UNEQUAL_ADDRS (loop_vinfo); | |
2854 | unsigned int i; | |
2855 | vec_object_pair *pair; | |
2856 | FOR_EACH_VEC_ELT (pairs, i, pair) | |
2857 | { | |
2858 | tree addr1 = build_fold_addr_expr (pair->first); | |
2859 | tree addr2 = build_fold_addr_expr (pair->second); | |
2860 | tree part_cond_expr = fold_build2 (NE_EXPR, boolean_type_node, | |
2861 | addr1, addr2); | |
2862 | chain_cond_expr (cond_expr, part_cond_expr); | |
2863 | } | |
ebfd146a IR |
2864 | } |
2865 | ||
ebfd146a IR |
2866 | /* Function vect_create_cond_for_alias_checks. |
2867 | ||
2868 | Create a conditional expression that represents the run-time checks for | |
2869 | overlapping of address ranges represented by a list of data references | |
2870 | relations passed as input. | |
2871 | ||
2872 | Input: | |
2873 | COND_EXPR - input conditional expression. New conditions will be chained | |
a05a89fa CH |
2874 | with logical AND operation. If it is NULL, then the function |
2875 | is used to return the number of alias checks. | |
ebfd146a IR |
2876 | LOOP_VINFO - field LOOP_VINFO_MAY_ALIAS_STMTS contains the list of ddrs |
2877 | to be checked. | |
2878 | ||
2879 | Output: | |
2880 | COND_EXPR - conditional expression. | |
ebfd146a | 2881 | |
a05a89fa | 2882 | The returned COND_EXPR is the conditional expression to be used in the if |
ebfd146a IR |
2883 | statement that controls which version of the loop gets executed at runtime. |
2884 | */ | |
2885 | ||
a05a89fa | 2886 | void |
4bdd44c4 | 2887 | vect_create_cond_for_alias_checks (loop_vec_info loop_vinfo, tree * cond_expr) |
ebfd146a | 2888 | { |
93bdc3ed | 2889 | vec<dr_with_seg_len_pair_t> comp_alias_ddrs = |
a05a89fa | 2890 | LOOP_VINFO_COMP_ALIAS_DDRS (loop_vinfo); |
ebfd146a | 2891 | |
a05a89fa | 2892 | if (comp_alias_ddrs.is_empty ()) |
ebfd146a IR |
2893 | return; |
2894 | ||
9cbd2d97 BC |
2895 | create_runtime_alias_checks (LOOP_VINFO_LOOP (loop_vinfo), |
2896 | &comp_alias_ddrs, cond_expr); | |
73fbfcad | 2897 | if (dump_enabled_p ()) |
ccb3ad87 | 2898 | dump_printf_loc (MSG_NOTE, vect_location, |
78c60e3d | 2899 | "created %u versioning for alias checks.\n", |
a05a89fa | 2900 | comp_alias_ddrs.length ()); |
ebfd146a IR |
2901 | } |
2902 | ||
2903 | ||
2904 | /* Function vect_loop_versioning. | |
b8698a0f | 2905 | |
ebfd146a IR |
2906 | If the loop has data references that may or may not be aligned or/and |
2907 | has data reference relations whose independence was not proven then | |
2908 | two versions of the loop need to be generated, one which is vectorized | |
2909 | and one which isn't. A test is then generated to control which of the | |
2910 | loops is executed. The test checks for the alignment of all of the | |
2911 | data references that may or may not be aligned. An additional | |
2912 | sequence of runtime tests is generated for each pairs of DDRs whose | |
b8698a0f L |
2913 | independence was not proven. The vectorized version of loop is |
2914 | executed only if both alias and alignment tests are passed. | |
2915 | ||
ebfd146a | 2916 | The test generated to check which version of loop is executed |
b8698a0f | 2917 | is modified to also check for profitability as indicated by the |
d9157f15 | 2918 | cost model threshold TH. |
86290011 RG |
2919 | |
2920 | The versioning precondition(s) are placed in *COND_EXPR and | |
d68d56b5 | 2921 | *COND_EXPR_STMT_LIST. */ |
ebfd146a IR |
2922 | |
2923 | void | |
368117e8 | 2924 | vect_loop_versioning (loop_vec_info loop_vinfo, |
a696bc4f RS |
2925 | unsigned int th, bool check_profitability, |
2926 | poly_uint64 versioning_threshold) | |
ebfd146a | 2927 | { |
01d32b2b | 2928 | struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo), *nloop; |
5ce9450f | 2929 | struct loop *scalar_loop = LOOP_VINFO_SCALAR_LOOP (loop_vinfo); |
ebfd146a | 2930 | basic_block condition_bb; |
538dd0b7 DM |
2931 | gphi_iterator gsi; |
2932 | gimple_stmt_iterator cond_exp_gsi; | |
ebfd146a IR |
2933 | basic_block merge_bb; |
2934 | basic_block new_exit_bb; | |
2935 | edge new_exit_e, e; | |
538dd0b7 | 2936 | gphi *orig_phi, *new_phi; |
368117e8 | 2937 | tree cond_expr = NULL_TREE; |
d68d56b5 | 2938 | gimple_seq cond_expr_stmt_list = NULL; |
ebfd146a | 2939 | tree arg; |
af2bbc51 | 2940 | profile_probability prob = profile_probability::likely (); |
ebfd146a | 2941 | gimple_seq gimplify_stmt_list = NULL; |
fdd29374 | 2942 | tree scalar_loop_iters = LOOP_VINFO_NITERSM1 (loop_vinfo); |
9cc1fb4b XDL |
2943 | bool version_align = LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT (loop_vinfo); |
2944 | bool version_alias = LOOP_REQUIRES_VERSIONING_FOR_ALIAS (loop_vinfo); | |
01d32b2b | 2945 | bool version_niter = LOOP_REQUIRES_VERSIONING_FOR_NITERS (loop_vinfo); |
ebfd146a | 2946 | |
368117e8 | 2947 | if (check_profitability) |
80be3333 | 2948 | cond_expr = fold_build2 (GE_EXPR, boolean_type_node, scalar_loop_iters, |
01d32b2b | 2949 | build_int_cst (TREE_TYPE (scalar_loop_iters), |
fdd29374 | 2950 | th - 1)); |
a696bc4f RS |
2951 | if (maybe_ne (versioning_threshold, 0U)) |
2952 | { | |
2953 | tree expr = fold_build2 (GE_EXPR, boolean_type_node, scalar_loop_iters, | |
2954 | build_int_cst (TREE_TYPE (scalar_loop_iters), | |
2955 | versioning_threshold - 1)); | |
2956 | if (cond_expr) | |
2957 | cond_expr = fold_build2 (BIT_AND_EXPR, boolean_type_node, | |
2958 | expr, cond_expr); | |
2959 | else | |
2960 | cond_expr = expr; | |
2961 | } | |
01d32b2b BC |
2962 | |
2963 | if (version_niter) | |
2964 | vect_create_cond_for_niters_checks (loop_vinfo, &cond_expr); | |
2965 | ||
2966 | if (cond_expr) | |
2967 | cond_expr = force_gimple_operand_1 (cond_expr, &cond_expr_stmt_list, | |
2968 | is_gimple_condexpr, NULL_TREE); | |
ebfd146a | 2969 | |
9cc1fb4b | 2970 | if (version_align) |
d68d56b5 RG |
2971 | vect_create_cond_for_align_checks (loop_vinfo, &cond_expr, |
2972 | &cond_expr_stmt_list); | |
ebfd146a | 2973 | |
9cc1fb4b | 2974 | if (version_alias) |
9adee305 RS |
2975 | { |
2976 | vect_create_cond_for_unequal_addrs (loop_vinfo, &cond_expr); | |
2977 | vect_create_cond_for_alias_checks (loop_vinfo, &cond_expr); | |
2978 | } | |
86290011 | 2979 | |
d68d56b5 RG |
2980 | cond_expr = force_gimple_operand_1 (cond_expr, &gimplify_stmt_list, |
2981 | is_gimple_condexpr, NULL_TREE); | |
2982 | gimple_seq_add_seq (&cond_expr_stmt_list, gimplify_stmt_list); | |
ebfd146a IR |
2983 | |
2984 | initialize_original_copy_tables (); | |
5ce9450f JJ |
2985 | if (scalar_loop) |
2986 | { | |
2987 | edge scalar_e; | |
2988 | basic_block preheader, scalar_preheader; | |
2989 | ||
2990 | /* We don't want to scale SCALAR_LOOP's frequencies, we need to | |
2991 | scale LOOP's frequencies instead. */ | |
5d3ebb71 | 2992 | nloop = loop_version (scalar_loop, cond_expr, &condition_bb, |
af2bbc51 JH |
2993 | prob, prob.invert (), prob, prob.invert (), true); |
2994 | scale_loop_frequencies (loop, prob); | |
5ce9450f JJ |
2995 | /* CONDITION_BB was created above SCALAR_LOOP's preheader, |
2996 | while we need to move it above LOOP's preheader. */ | |
2997 | e = loop_preheader_edge (loop); | |
2998 | scalar_e = loop_preheader_edge (scalar_loop); | |
2999 | gcc_assert (empty_block_p (e->src) | |
3000 | && single_pred_p (e->src)); | |
3001 | gcc_assert (empty_block_p (scalar_e->src) | |
3002 | && single_pred_p (scalar_e->src)); | |
3003 | gcc_assert (single_pred_p (condition_bb)); | |
3004 | preheader = e->src; | |
3005 | scalar_preheader = scalar_e->src; | |
3006 | scalar_e = find_edge (condition_bb, scalar_preheader); | |
3007 | e = single_pred_edge (preheader); | |
3008 | redirect_edge_and_branch_force (single_pred_edge (condition_bb), | |
3009 | scalar_preheader); | |
3010 | redirect_edge_and_branch_force (scalar_e, preheader); | |
3011 | redirect_edge_and_branch_force (e, condition_bb); | |
3012 | set_immediate_dominator (CDI_DOMINATORS, condition_bb, | |
3013 | single_pred (condition_bb)); | |
3014 | set_immediate_dominator (CDI_DOMINATORS, scalar_preheader, | |
3015 | single_pred (scalar_preheader)); | |
3016 | set_immediate_dominator (CDI_DOMINATORS, preheader, | |
3017 | condition_bb); | |
3018 | } | |
3019 | else | |
01d32b2b | 3020 | nloop = loop_version (loop, cond_expr, &condition_bb, |
af2bbc51 | 3021 | prob, prob.invert (), prob, prob.invert (), true); |
01d32b2b BC |
3022 | |
3023 | if (version_niter) | |
3024 | { | |
3025 | /* The versioned loop could be infinite, we need to clear existing | |
3026 | niter information which is copied from the original loop. */ | |
3027 | gcc_assert (loop_constraint_set_p (loop, LOOP_C_FINITE)); | |
3028 | vect_free_loop_info_assumptions (nloop); | |
3029 | /* And set constraint LOOP_C_INFINITE for niter analyzer. */ | |
3030 | loop_constraint_set (loop, LOOP_C_INFINITE); | |
3031 | } | |
9cc1fb4b | 3032 | |
b05e0233 | 3033 | if (LOCATION_LOCUS (vect_location) != UNKNOWN_LOCATION |
9cc1fb4b XDL |
3034 | && dump_enabled_p ()) |
3035 | { | |
3036 | if (version_alias) | |
3037 | dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location, | |
3038 | "loop versioned for vectorization because of " | |
3039 | "possible aliasing\n"); | |
3040 | if (version_align) | |
3041 | dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location, | |
3042 | "loop versioned for vectorization to enhance " | |
3043 | "alignment\n"); | |
3044 | ||
3045 | } | |
c3284718 | 3046 | free_original_copy_tables (); |
ebfd146a | 3047 | |
b8698a0f | 3048 | /* Loop versioning violates an assumption we try to maintain during |
ebfd146a IR |
3049 | vectorization - that the loop exit block has a single predecessor. |
3050 | After versioning, the exit block of both loop versions is the same | |
3051 | basic block (i.e. it has two predecessors). Just in order to simplify | |
3052 | following transformations in the vectorizer, we fix this situation | |
3053 | here by adding a new (empty) block on the exit-edge of the loop, | |
5ce9450f JJ |
3054 | with the proper loop-exit phis to maintain loop-closed-form. |
3055 | If loop versioning wasn't done from loop, but scalar_loop instead, | |
3056 | merge_bb will have already just a single successor. */ | |
b8698a0f | 3057 | |
ebfd146a | 3058 | merge_bb = single_exit (loop)->dest; |
5ce9450f | 3059 | if (scalar_loop == NULL || EDGE_COUNT (merge_bb->preds) >= 2) |
ebfd146a | 3060 | { |
5ce9450f JJ |
3061 | gcc_assert (EDGE_COUNT (merge_bb->preds) >= 2); |
3062 | new_exit_bb = split_edge (single_exit (loop)); | |
3063 | new_exit_e = single_exit (loop); | |
3064 | e = EDGE_SUCC (new_exit_bb, 0); | |
3065 | ||
3066 | for (gsi = gsi_start_phis (merge_bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
3067 | { | |
3068 | tree new_res; | |
538dd0b7 | 3069 | orig_phi = gsi.phi (); |
b731b390 | 3070 | new_res = copy_ssa_name (PHI_RESULT (orig_phi)); |
5ce9450f JJ |
3071 | new_phi = create_phi_node (new_res, new_exit_bb); |
3072 | arg = PHI_ARG_DEF_FROM_EDGE (orig_phi, e); | |
3073 | add_phi_arg (new_phi, arg, new_exit_e, | |
3074 | gimple_phi_arg_location_from_edge (orig_phi, e)); | |
3075 | adjust_phi_and_debug_stmts (orig_phi, e, PHI_RESULT (new_phi)); | |
3076 | } | |
b8698a0f | 3077 | } |
ebfd146a IR |
3078 | |
3079 | /* End loop-exit-fixes after versioning. */ | |
3080 | ||
d68d56b5 | 3081 | if (cond_expr_stmt_list) |
ebfd146a IR |
3082 | { |
3083 | cond_exp_gsi = gsi_last_bb (condition_bb); | |
d68d56b5 | 3084 | gsi_insert_seq_before (&cond_exp_gsi, cond_expr_stmt_list, |
86290011 | 3085 | GSI_SAME_STMT); |
ebfd146a | 3086 | } |
90eb75f2 | 3087 | update_ssa (TODO_update_ssa); |
ebfd146a | 3088 | } |