1 /* Global, SSA-based optimizations using mathematical identities.
2 Copyright (C) 2005-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 3, or (at your option) any
11 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Currently, the only mini-pass in this file tries to CSE reciprocal
21 operations. These are common in sequences such as this one:
23 modulus = sqrt(x*x + y*y + z*z);
28 that can be optimized to
30 modulus = sqrt(x*x + y*y + z*z);
31 rmodulus = 1.0 / modulus;
36 We do this for loop invariant divisors, and with this pass whenever
37 we notice that a division has the same divisor multiple times.
39 Of course, like in PRE, we don't insert a division if a dominator
40 already has one. However, this cannot be done as an extension of
41 PRE for several reasons.
43 First of all, with some experiments it was found out that the
44 transformation is not always useful if there are only two divisions
45 hy the same divisor. This is probably because modern processors
46 can pipeline the divisions; on older, in-order processors it should
47 still be effective to optimize two divisions by the same number.
48 We make this a param, and it shall be called N in the remainder of
51 Second, if trapping math is active, we have less freedom on where
52 to insert divisions: we can only do so in basic blocks that already
53 contain one. (If divisions don't trap, instead, we can insert
54 divisions elsewhere, which will be in blocks that are common dominators
55 of those that have the division).
57 We really don't want to compute the reciprocal unless a division will
58 be found. To do this, we won't insert the division in a basic block
59 that has less than N divisions *post-dominating* it.
61 The algorithm constructs a subset of the dominator tree, holding the
62 blocks containing the divisions and the common dominators to them,
63 and walk it twice. The first walk is in post-order, and it annotates
64 each block with the number of divisions that post-dominate it: this
65 gives information on where divisions can be inserted profitably.
66 The second walk is in pre-order, and it inserts divisions as explained
67 above, and replaces divisions by multiplications.
69 In the best case, the cost of the pass is O(n_statements). In the
70 worst-case, the cost is due to creating the dominator tree subset,
71 with a cost of O(n_basic_blocks ^ 2); however this can only happen
72 for n_statements / n_basic_blocks statements. So, the amortized cost
73 of creating the dominator tree subset is O(n_basic_blocks) and the
74 worst-case cost of the pass is O(n_statements * n_basic_blocks).
76 More practically, the cost will be small because there are few
77 divisions, and they tend to be in the same basic block, so insert_bb
78 is called very few times.
80 If we did this using domwalk.c, an efficient implementation would have
81 to work on all the variables in a single pass, because we could not
82 work on just a subset of the dominator tree, as we do now, and the
83 cost would also be something like O(n_statements * n_basic_blocks).
84 The data structures would be more complex in order to work on all the
85 variables in a single pass. */
89 #include "coretypes.h"
93 #include "basic-block.h"
94 #include "tree-ssa-alias.h"
95 #include "internal-fn.h"
96 #include "gimple-fold.h"
97 #include "gimple-expr.h"
100 #include "gimple-iterator.h"
101 #include "gimplify.h"
102 #include "gimplify-me.h"
103 #include "stor-layout.h"
104 #include "gimple-ssa.h"
105 #include "tree-cfg.h"
106 #include "tree-phinodes.h"
107 #include "ssa-iterators.h"
108 #include "stringpool.h"
109 #include "tree-ssanames.h"
111 #include "tree-dfa.h"
112 #include "tree-ssa.h"
113 #include "tree-pass.h"
114 #include "alloc-pool.h"
116 #include "gimple-pretty-print.h"
117 #include "builtins.h"
119 /* FIXME: RTL headers have to be included here for optabs. */
120 #include "rtl.h" /* Because optabs.h wants enum rtx_code. */
121 #include "expr.h" /* Because optabs.h wants sepops. */
124 /* This structure represents one basic block that either computes a
125 division, or is a common dominator for basic block that compute a
128 /* The basic block represented by this structure. */
131 /* If non-NULL, the SSA_NAME holding the definition for a reciprocal
135 /* If non-NULL, the GIMPLE_ASSIGN for a reciprocal computation that
136 was inserted in BB. */
137 gimple recip_def_stmt
;
139 /* Pointer to a list of "struct occurrence"s for blocks dominated
141 struct occurrence
*children
;
143 /* Pointer to the next "struct occurrence"s in the list of blocks
144 sharing a common dominator. */
145 struct occurrence
*next
;
147 /* The number of divisions that are in BB before compute_merit. The
148 number of divisions that are in BB or post-dominate it after
152 /* True if the basic block has a division, false if it is a common
153 dominator for basic blocks that do. If it is false and trapping
154 math is active, BB is not a candidate for inserting a reciprocal. */
155 bool bb_has_division
;
160 /* Number of 1.0/X ops inserted. */
163 /* Number of 1.0/FUNC ops inserted. */
169 /* Number of cexpi calls inserted. */
175 /* Number of hand-written 16-bit nop / bswaps found. */
178 /* Number of hand-written 32-bit nop / bswaps found. */
181 /* Number of hand-written 64-bit nop / bswaps found. */
183 } nop_stats
, bswap_stats
;
187 /* Number of widening multiplication ops inserted. */
188 int widen_mults_inserted
;
190 /* Number of integer multiply-and-accumulate ops inserted. */
193 /* Number of fp fused multiply-add ops inserted. */
197 /* The instance of "struct occurrence" representing the highest
198 interesting block in the dominator tree. */
199 static struct occurrence
*occ_head
;
201 /* Allocation pool for getting instances of "struct occurrence". */
202 static alloc_pool occ_pool
;
206 /* Allocate and return a new struct occurrence for basic block BB, and
207 whose children list is headed by CHILDREN. */
208 static struct occurrence
*
209 occ_new (basic_block bb
, struct occurrence
*children
)
211 struct occurrence
*occ
;
213 bb
->aux
= occ
= (struct occurrence
*) pool_alloc (occ_pool
);
214 memset (occ
, 0, sizeof (struct occurrence
));
217 occ
->children
= children
;
222 /* Insert NEW_OCC into our subset of the dominator tree. P_HEAD points to a
223 list of "struct occurrence"s, one per basic block, having IDOM as
224 their common dominator.
226 We try to insert NEW_OCC as deep as possible in the tree, and we also
227 insert any other block that is a common dominator for BB and one
228 block already in the tree. */
231 insert_bb (struct occurrence
*new_occ
, basic_block idom
,
232 struct occurrence
**p_head
)
234 struct occurrence
*occ
, **p_occ
;
236 for (p_occ
= p_head
; (occ
= *p_occ
) != NULL
; )
238 basic_block bb
= new_occ
->bb
, occ_bb
= occ
->bb
;
239 basic_block dom
= nearest_common_dominator (CDI_DOMINATORS
, occ_bb
, bb
);
242 /* BB dominates OCC_BB. OCC becomes NEW_OCC's child: remove OCC
245 occ
->next
= new_occ
->children
;
246 new_occ
->children
= occ
;
248 /* Try the next block (it may as well be dominated by BB). */
251 else if (dom
== occ_bb
)
253 /* OCC_BB dominates BB. Tail recurse to look deeper. */
254 insert_bb (new_occ
, dom
, &occ
->children
);
258 else if (dom
!= idom
)
260 gcc_assert (!dom
->aux
);
262 /* There is a dominator between IDOM and BB, add it and make
263 two children out of NEW_OCC and OCC. First, remove OCC from
269 /* None of the previous blocks has DOM as a dominator: if we tail
270 recursed, we would reexamine them uselessly. Just switch BB with
271 DOM, and go on looking for blocks dominated by DOM. */
272 new_occ
= occ_new (dom
, new_occ
);
277 /* Nothing special, go on with the next element. */
282 /* No place was found as a child of IDOM. Make BB a sibling of IDOM. */
283 new_occ
->next
= *p_head
;
287 /* Register that we found a division in BB. */
290 register_division_in (basic_block bb
)
292 struct occurrence
*occ
;
294 occ
= (struct occurrence
*) bb
->aux
;
297 occ
= occ_new (bb
, NULL
);
298 insert_bb (occ
, ENTRY_BLOCK_PTR_FOR_FN (cfun
), &occ_head
);
301 occ
->bb_has_division
= true;
302 occ
->num_divisions
++;
306 /* Compute the number of divisions that postdominate each block in OCC and
310 compute_merit (struct occurrence
*occ
)
312 struct occurrence
*occ_child
;
313 basic_block dom
= occ
->bb
;
315 for (occ_child
= occ
->children
; occ_child
; occ_child
= occ_child
->next
)
318 if (occ_child
->children
)
319 compute_merit (occ_child
);
322 bb
= single_noncomplex_succ (dom
);
326 if (dominated_by_p (CDI_POST_DOMINATORS
, bb
, occ_child
->bb
))
327 occ
->num_divisions
+= occ_child
->num_divisions
;
332 /* Return whether USE_STMT is a floating-point division by DEF. */
334 is_division_by (gimple use_stmt
, tree def
)
336 return is_gimple_assign (use_stmt
)
337 && gimple_assign_rhs_code (use_stmt
) == RDIV_EXPR
338 && gimple_assign_rhs2 (use_stmt
) == def
339 /* Do not recognize x / x as valid division, as we are getting
340 confused later by replacing all immediate uses x in such
342 && gimple_assign_rhs1 (use_stmt
) != def
;
345 /* Walk the subset of the dominator tree rooted at OCC, setting the
346 RECIP_DEF field to a definition of 1.0 / DEF that can be used in
347 the given basic block. The field may be left NULL, of course,
348 if it is not possible or profitable to do the optimization.
350 DEF_BSI is an iterator pointing at the statement defining DEF.
351 If RECIP_DEF is set, a dominator already has a computation that can
355 insert_reciprocals (gimple_stmt_iterator
*def_gsi
, struct occurrence
*occ
,
356 tree def
, tree recip_def
, int threshold
)
360 gimple_stmt_iterator gsi
;
361 struct occurrence
*occ_child
;
364 && (occ
->bb_has_division
|| !flag_trapping_math
)
365 && occ
->num_divisions
>= threshold
)
367 /* Make a variable with the replacement and substitute it. */
368 type
= TREE_TYPE (def
);
369 recip_def
= create_tmp_reg (type
, "reciptmp");
370 new_stmt
= gimple_build_assign_with_ops (RDIV_EXPR
, recip_def
,
371 build_one_cst (type
), def
);
373 if (occ
->bb_has_division
)
375 /* Case 1: insert before an existing division. */
376 gsi
= gsi_after_labels (occ
->bb
);
377 while (!gsi_end_p (gsi
) && !is_division_by (gsi_stmt (gsi
), def
))
380 gsi_insert_before (&gsi
, new_stmt
, GSI_SAME_STMT
);
382 else if (def_gsi
&& occ
->bb
== def_gsi
->bb
)
384 /* Case 2: insert right after the definition. Note that this will
385 never happen if the definition statement can throw, because in
386 that case the sole successor of the statement's basic block will
387 dominate all the uses as well. */
388 gsi_insert_after (def_gsi
, new_stmt
, GSI_NEW_STMT
);
392 /* Case 3: insert in a basic block not containing defs/uses. */
393 gsi
= gsi_after_labels (occ
->bb
);
394 gsi_insert_before (&gsi
, new_stmt
, GSI_SAME_STMT
);
397 reciprocal_stats
.rdivs_inserted
++;
399 occ
->recip_def_stmt
= new_stmt
;
402 occ
->recip_def
= recip_def
;
403 for (occ_child
= occ
->children
; occ_child
; occ_child
= occ_child
->next
)
404 insert_reciprocals (def_gsi
, occ_child
, def
, recip_def
, threshold
);
408 /* Replace the division at USE_P with a multiplication by the reciprocal, if
412 replace_reciprocal (use_operand_p use_p
)
414 gimple use_stmt
= USE_STMT (use_p
);
415 basic_block bb
= gimple_bb (use_stmt
);
416 struct occurrence
*occ
= (struct occurrence
*) bb
->aux
;
418 if (optimize_bb_for_speed_p (bb
)
419 && occ
->recip_def
&& use_stmt
!= occ
->recip_def_stmt
)
421 gimple_stmt_iterator gsi
= gsi_for_stmt (use_stmt
);
422 gimple_assign_set_rhs_code (use_stmt
, MULT_EXPR
);
423 SET_USE (use_p
, occ
->recip_def
);
424 fold_stmt_inplace (&gsi
);
425 update_stmt (use_stmt
);
430 /* Free OCC and return one more "struct occurrence" to be freed. */
432 static struct occurrence
*
433 free_bb (struct occurrence
*occ
)
435 struct occurrence
*child
, *next
;
437 /* First get the two pointers hanging off OCC. */
439 child
= occ
->children
;
441 pool_free (occ_pool
, occ
);
443 /* Now ensure that we don't recurse unless it is necessary. */
449 next
= free_bb (next
);
456 /* Look for floating-point divisions among DEF's uses, and try to
457 replace them by multiplications with the reciprocal. Add
458 as many statements computing the reciprocal as needed.
460 DEF must be a GIMPLE register of a floating-point type. */
463 execute_cse_reciprocals_1 (gimple_stmt_iterator
*def_gsi
, tree def
)
466 imm_use_iterator use_iter
;
467 struct occurrence
*occ
;
468 int count
= 0, threshold
;
470 gcc_assert (FLOAT_TYPE_P (TREE_TYPE (def
)) && is_gimple_reg (def
));
472 FOR_EACH_IMM_USE_FAST (use_p
, use_iter
, def
)
474 gimple use_stmt
= USE_STMT (use_p
);
475 if (is_division_by (use_stmt
, def
))
477 register_division_in (gimple_bb (use_stmt
));
482 /* Do the expensive part only if we can hope to optimize something. */
483 threshold
= targetm
.min_divisions_for_recip_mul (TYPE_MODE (TREE_TYPE (def
)));
484 if (count
>= threshold
)
487 for (occ
= occ_head
; occ
; occ
= occ
->next
)
490 insert_reciprocals (def_gsi
, occ
, def
, NULL
, threshold
);
493 FOR_EACH_IMM_USE_STMT (use_stmt
, use_iter
, def
)
495 if (is_division_by (use_stmt
, def
))
497 FOR_EACH_IMM_USE_ON_STMT (use_p
, use_iter
)
498 replace_reciprocal (use_p
);
503 for (occ
= occ_head
; occ
; )
509 /* Go through all the floating-point SSA_NAMEs, and call
510 execute_cse_reciprocals_1 on each of them. */
513 const pass_data pass_data_cse_reciprocals
=
515 GIMPLE_PASS
, /* type */
517 OPTGROUP_NONE
, /* optinfo_flags */
518 true, /* has_execute */
520 PROP_ssa
, /* properties_required */
521 0, /* properties_provided */
522 0, /* properties_destroyed */
523 0, /* todo_flags_start */
524 TODO_update_ssa
, /* todo_flags_finish */
527 class pass_cse_reciprocals
: public gimple_opt_pass
530 pass_cse_reciprocals (gcc::context
*ctxt
)
531 : gimple_opt_pass (pass_data_cse_reciprocals
, ctxt
)
534 /* opt_pass methods: */
535 virtual bool gate (function
*) { return optimize
&& flag_reciprocal_math
; }
536 virtual unsigned int execute (function
*);
538 }; // class pass_cse_reciprocals
541 pass_cse_reciprocals::execute (function
*fun
)
546 occ_pool
= create_alloc_pool ("dominators for recip",
547 sizeof (struct occurrence
),
548 n_basic_blocks_for_fn (fun
) / 3 + 1);
550 memset (&reciprocal_stats
, 0, sizeof (reciprocal_stats
));
551 calculate_dominance_info (CDI_DOMINATORS
);
552 calculate_dominance_info (CDI_POST_DOMINATORS
);
554 #ifdef ENABLE_CHECKING
555 FOR_EACH_BB_FN (bb
, fun
)
556 gcc_assert (!bb
->aux
);
559 for (arg
= DECL_ARGUMENTS (fun
->decl
); arg
; arg
= DECL_CHAIN (arg
))
560 if (FLOAT_TYPE_P (TREE_TYPE (arg
))
561 && is_gimple_reg (arg
))
563 tree name
= ssa_default_def (fun
, arg
);
565 execute_cse_reciprocals_1 (NULL
, name
);
568 FOR_EACH_BB_FN (bb
, fun
)
570 gimple_stmt_iterator gsi
;
574 for (gsi
= gsi_start_phis (bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
576 phi
= gsi_stmt (gsi
);
577 def
= PHI_RESULT (phi
);
578 if (! virtual_operand_p (def
)
579 && FLOAT_TYPE_P (TREE_TYPE (def
)))
580 execute_cse_reciprocals_1 (NULL
, def
);
583 for (gsi
= gsi_after_labels (bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
585 gimple stmt
= gsi_stmt (gsi
);
587 if (gimple_has_lhs (stmt
)
588 && (def
= SINGLE_SSA_TREE_OPERAND (stmt
, SSA_OP_DEF
)) != NULL
589 && FLOAT_TYPE_P (TREE_TYPE (def
))
590 && TREE_CODE (def
) == SSA_NAME
)
591 execute_cse_reciprocals_1 (&gsi
, def
);
594 if (optimize_bb_for_size_p (bb
))
597 /* Scan for a/func(b) and convert it to reciprocal a*rfunc(b). */
598 for (gsi
= gsi_after_labels (bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
600 gimple stmt
= gsi_stmt (gsi
);
603 if (is_gimple_assign (stmt
)
604 && gimple_assign_rhs_code (stmt
) == RDIV_EXPR
)
606 tree arg1
= gimple_assign_rhs2 (stmt
);
609 if (TREE_CODE (arg1
) != SSA_NAME
)
612 stmt1
= SSA_NAME_DEF_STMT (arg1
);
614 if (is_gimple_call (stmt1
)
615 && gimple_call_lhs (stmt1
)
616 && (fndecl
= gimple_call_fndecl (stmt1
))
617 && (DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_NORMAL
618 || DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
))
620 enum built_in_function code
;
625 code
= DECL_FUNCTION_CODE (fndecl
);
626 md_code
= DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
;
628 fndecl
= targetm
.builtin_reciprocal (code
, md_code
, false);
632 /* Check that all uses of the SSA name are divisions,
633 otherwise replacing the defining statement will do
636 FOR_EACH_IMM_USE_FAST (use_p
, ui
, arg1
)
638 gimple stmt2
= USE_STMT (use_p
);
639 if (is_gimple_debug (stmt2
))
641 if (!is_gimple_assign (stmt2
)
642 || gimple_assign_rhs_code (stmt2
) != RDIV_EXPR
643 || gimple_assign_rhs1 (stmt2
) == arg1
644 || gimple_assign_rhs2 (stmt2
) != arg1
)
653 gimple_replace_ssa_lhs (stmt1
, arg1
);
654 gimple_call_set_fndecl (stmt1
, fndecl
);
656 reciprocal_stats
.rfuncs_inserted
++;
658 FOR_EACH_IMM_USE_STMT (stmt
, ui
, arg1
)
660 gimple_stmt_iterator gsi
= gsi_for_stmt (stmt
);
661 gimple_assign_set_rhs_code (stmt
, MULT_EXPR
);
662 fold_stmt_inplace (&gsi
);
670 statistics_counter_event (fun
, "reciprocal divs inserted",
671 reciprocal_stats
.rdivs_inserted
);
672 statistics_counter_event (fun
, "reciprocal functions inserted",
673 reciprocal_stats
.rfuncs_inserted
);
675 free_dominance_info (CDI_DOMINATORS
);
676 free_dominance_info (CDI_POST_DOMINATORS
);
677 free_alloc_pool (occ_pool
);
684 make_pass_cse_reciprocals (gcc::context
*ctxt
)
686 return new pass_cse_reciprocals (ctxt
);
689 /* Records an occurrence at statement USE_STMT in the vector of trees
690 STMTS if it is dominated by *TOP_BB or dominates it or this basic block
691 is not yet initialized. Returns true if the occurrence was pushed on
692 the vector. Adjusts *TOP_BB to be the basic block dominating all
693 statements in the vector. */
696 maybe_record_sincos (vec
<gimple
> *stmts
,
697 basic_block
*top_bb
, gimple use_stmt
)
699 basic_block use_bb
= gimple_bb (use_stmt
);
701 && (*top_bb
== use_bb
702 || dominated_by_p (CDI_DOMINATORS
, use_bb
, *top_bb
)))
703 stmts
->safe_push (use_stmt
);
705 || dominated_by_p (CDI_DOMINATORS
, *top_bb
, use_bb
))
707 stmts
->safe_push (use_stmt
);
716 /* Look for sin, cos and cexpi calls with the same argument NAME and
717 create a single call to cexpi CSEing the result in this case.
718 We first walk over all immediate uses of the argument collecting
719 statements that we can CSE in a vector and in a second pass replace
720 the statement rhs with a REALPART or IMAGPART expression on the
721 result of the cexpi call we insert before the use statement that
722 dominates all other candidates. */
725 execute_cse_sincos_1 (tree name
)
727 gimple_stmt_iterator gsi
;
728 imm_use_iterator use_iter
;
729 tree fndecl
, res
, type
;
730 gimple def_stmt
, use_stmt
, stmt
;
731 int seen_cos
= 0, seen_sin
= 0, seen_cexpi
= 0;
732 vec
<gimple
> stmts
= vNULL
;
733 basic_block top_bb
= NULL
;
735 bool cfg_changed
= false;
737 type
= TREE_TYPE (name
);
738 FOR_EACH_IMM_USE_STMT (use_stmt
, use_iter
, name
)
740 if (gimple_code (use_stmt
) != GIMPLE_CALL
741 || !gimple_call_lhs (use_stmt
)
742 || !(fndecl
= gimple_call_fndecl (use_stmt
))
743 || DECL_BUILT_IN_CLASS (fndecl
) != BUILT_IN_NORMAL
)
746 switch (DECL_FUNCTION_CODE (fndecl
))
748 CASE_FLT_FN (BUILT_IN_COS
):
749 seen_cos
|= maybe_record_sincos (&stmts
, &top_bb
, use_stmt
) ? 1 : 0;
752 CASE_FLT_FN (BUILT_IN_SIN
):
753 seen_sin
|= maybe_record_sincos (&stmts
, &top_bb
, use_stmt
) ? 1 : 0;
756 CASE_FLT_FN (BUILT_IN_CEXPI
):
757 seen_cexpi
|= maybe_record_sincos (&stmts
, &top_bb
, use_stmt
) ? 1 : 0;
764 if (seen_cos
+ seen_sin
+ seen_cexpi
<= 1)
770 /* Simply insert cexpi at the beginning of top_bb but not earlier than
771 the name def statement. */
772 fndecl
= mathfn_built_in (type
, BUILT_IN_CEXPI
);
775 stmt
= gimple_build_call (fndecl
, 1, name
);
776 res
= make_temp_ssa_name (TREE_TYPE (TREE_TYPE (fndecl
)), stmt
, "sincostmp");
777 gimple_call_set_lhs (stmt
, res
);
779 def_stmt
= SSA_NAME_DEF_STMT (name
);
780 if (!SSA_NAME_IS_DEFAULT_DEF (name
)
781 && gimple_code (def_stmt
) != GIMPLE_PHI
782 && gimple_bb (def_stmt
) == top_bb
)
784 gsi
= gsi_for_stmt (def_stmt
);
785 gsi_insert_after (&gsi
, stmt
, GSI_SAME_STMT
);
789 gsi
= gsi_after_labels (top_bb
);
790 gsi_insert_before (&gsi
, stmt
, GSI_SAME_STMT
);
792 sincos_stats
.inserted
++;
794 /* And adjust the recorded old call sites. */
795 for (i
= 0; stmts
.iterate (i
, &use_stmt
); ++i
)
798 fndecl
= gimple_call_fndecl (use_stmt
);
800 switch (DECL_FUNCTION_CODE (fndecl
))
802 CASE_FLT_FN (BUILT_IN_COS
):
803 rhs
= fold_build1 (REALPART_EXPR
, type
, res
);
806 CASE_FLT_FN (BUILT_IN_SIN
):
807 rhs
= fold_build1 (IMAGPART_EXPR
, type
, res
);
810 CASE_FLT_FN (BUILT_IN_CEXPI
):
818 /* Replace call with a copy. */
819 stmt
= gimple_build_assign (gimple_call_lhs (use_stmt
), rhs
);
821 gsi
= gsi_for_stmt (use_stmt
);
822 gsi_replace (&gsi
, stmt
, true);
823 if (gimple_purge_dead_eh_edges (gimple_bb (stmt
)))
832 /* To evaluate powi(x,n), the floating point value x raised to the
833 constant integer exponent n, we use a hybrid algorithm that
834 combines the "window method" with look-up tables. For an
835 introduction to exponentiation algorithms and "addition chains",
836 see section 4.6.3, "Evaluation of Powers" of Donald E. Knuth,
837 "Seminumerical Algorithms", Vol. 2, "The Art of Computer Programming",
838 3rd Edition, 1998, and Daniel M. Gordon, "A Survey of Fast Exponentiation
839 Methods", Journal of Algorithms, Vol. 27, pp. 129-146, 1998. */
841 /* Provide a default value for POWI_MAX_MULTS, the maximum number of
842 multiplications to inline before calling the system library's pow
843 function. powi(x,n) requires at worst 2*bits(n)-2 multiplications,
844 so this default never requires calling pow, powf or powl. */
846 #ifndef POWI_MAX_MULTS
847 #define POWI_MAX_MULTS (2*HOST_BITS_PER_WIDE_INT-2)
850 /* The size of the "optimal power tree" lookup table. All
851 exponents less than this value are simply looked up in the
852 powi_table below. This threshold is also used to size the
853 cache of pseudo registers that hold intermediate results. */
854 #define POWI_TABLE_SIZE 256
856 /* The size, in bits of the window, used in the "window method"
857 exponentiation algorithm. This is equivalent to a radix of
858 (1<<POWI_WINDOW_SIZE) in the corresponding "m-ary method". */
859 #define POWI_WINDOW_SIZE 3
861 /* The following table is an efficient representation of an
862 "optimal power tree". For each value, i, the corresponding
863 value, j, in the table states than an optimal evaluation
864 sequence for calculating pow(x,i) can be found by evaluating
865 pow(x,j)*pow(x,i-j). An optimal power tree for the first
866 100 integers is given in Knuth's "Seminumerical algorithms". */
868 static const unsigned char powi_table
[POWI_TABLE_SIZE
] =
870 0, 1, 1, 2, 2, 3, 3, 4, /* 0 - 7 */
871 4, 6, 5, 6, 6, 10, 7, 9, /* 8 - 15 */
872 8, 16, 9, 16, 10, 12, 11, 13, /* 16 - 23 */
873 12, 17, 13, 18, 14, 24, 15, 26, /* 24 - 31 */
874 16, 17, 17, 19, 18, 33, 19, 26, /* 32 - 39 */
875 20, 25, 21, 40, 22, 27, 23, 44, /* 40 - 47 */
876 24, 32, 25, 34, 26, 29, 27, 44, /* 48 - 55 */
877 28, 31, 29, 34, 30, 60, 31, 36, /* 56 - 63 */
878 32, 64, 33, 34, 34, 46, 35, 37, /* 64 - 71 */
879 36, 65, 37, 50, 38, 48, 39, 69, /* 72 - 79 */
880 40, 49, 41, 43, 42, 51, 43, 58, /* 80 - 87 */
881 44, 64, 45, 47, 46, 59, 47, 76, /* 88 - 95 */
882 48, 65, 49, 66, 50, 67, 51, 66, /* 96 - 103 */
883 52, 70, 53, 74, 54, 104, 55, 74, /* 104 - 111 */
884 56, 64, 57, 69, 58, 78, 59, 68, /* 112 - 119 */
885 60, 61, 61, 80, 62, 75, 63, 68, /* 120 - 127 */
886 64, 65, 65, 128, 66, 129, 67, 90, /* 128 - 135 */
887 68, 73, 69, 131, 70, 94, 71, 88, /* 136 - 143 */
888 72, 128, 73, 98, 74, 132, 75, 121, /* 144 - 151 */
889 76, 102, 77, 124, 78, 132, 79, 106, /* 152 - 159 */
890 80, 97, 81, 160, 82, 99, 83, 134, /* 160 - 167 */
891 84, 86, 85, 95, 86, 160, 87, 100, /* 168 - 175 */
892 88, 113, 89, 98, 90, 107, 91, 122, /* 176 - 183 */
893 92, 111, 93, 102, 94, 126, 95, 150, /* 184 - 191 */
894 96, 128, 97, 130, 98, 133, 99, 195, /* 192 - 199 */
895 100, 128, 101, 123, 102, 164, 103, 138, /* 200 - 207 */
896 104, 145, 105, 146, 106, 109, 107, 149, /* 208 - 215 */
897 108, 200, 109, 146, 110, 170, 111, 157, /* 216 - 223 */
898 112, 128, 113, 130, 114, 182, 115, 132, /* 224 - 231 */
899 116, 200, 117, 132, 118, 158, 119, 206, /* 232 - 239 */
900 120, 240, 121, 162, 122, 147, 123, 152, /* 240 - 247 */
901 124, 166, 125, 214, 126, 138, 127, 153, /* 248 - 255 */
905 /* Return the number of multiplications required to calculate
906 powi(x,n) where n is less than POWI_TABLE_SIZE. This is a
907 subroutine of powi_cost. CACHE is an array indicating
908 which exponents have already been calculated. */
911 powi_lookup_cost (unsigned HOST_WIDE_INT n
, bool *cache
)
913 /* If we've already calculated this exponent, then this evaluation
914 doesn't require any additional multiplications. */
919 return powi_lookup_cost (n
- powi_table
[n
], cache
)
920 + powi_lookup_cost (powi_table
[n
], cache
) + 1;
923 /* Return the number of multiplications required to calculate
924 powi(x,n) for an arbitrary x, given the exponent N. This
925 function needs to be kept in sync with powi_as_mults below. */
928 powi_cost (HOST_WIDE_INT n
)
930 bool cache
[POWI_TABLE_SIZE
];
931 unsigned HOST_WIDE_INT digit
;
932 unsigned HOST_WIDE_INT val
;
938 /* Ignore the reciprocal when calculating the cost. */
939 val
= (n
< 0) ? -n
: n
;
941 /* Initialize the exponent cache. */
942 memset (cache
, 0, POWI_TABLE_SIZE
* sizeof (bool));
947 while (val
>= POWI_TABLE_SIZE
)
951 digit
= val
& ((1 << POWI_WINDOW_SIZE
) - 1);
952 result
+= powi_lookup_cost (digit
, cache
)
953 + POWI_WINDOW_SIZE
+ 1;
954 val
>>= POWI_WINDOW_SIZE
;
963 return result
+ powi_lookup_cost (val
, cache
);
966 /* Recursive subroutine of powi_as_mults. This function takes the
967 array, CACHE, of already calculated exponents and an exponent N and
968 returns a tree that corresponds to CACHE[1]**N, with type TYPE. */
971 powi_as_mults_1 (gimple_stmt_iterator
*gsi
, location_t loc
, tree type
,
972 HOST_WIDE_INT n
, tree
*cache
)
974 tree op0
, op1
, ssa_target
;
975 unsigned HOST_WIDE_INT digit
;
978 if (n
< POWI_TABLE_SIZE
&& cache
[n
])
981 ssa_target
= make_temp_ssa_name (type
, NULL
, "powmult");
983 if (n
< POWI_TABLE_SIZE
)
985 cache
[n
] = ssa_target
;
986 op0
= powi_as_mults_1 (gsi
, loc
, type
, n
- powi_table
[n
], cache
);
987 op1
= powi_as_mults_1 (gsi
, loc
, type
, powi_table
[n
], cache
);
991 digit
= n
& ((1 << POWI_WINDOW_SIZE
) - 1);
992 op0
= powi_as_mults_1 (gsi
, loc
, type
, n
- digit
, cache
);
993 op1
= powi_as_mults_1 (gsi
, loc
, type
, digit
, cache
);
997 op0
= powi_as_mults_1 (gsi
, loc
, type
, n
>> 1, cache
);
1001 mult_stmt
= gimple_build_assign_with_ops (MULT_EXPR
, ssa_target
, op0
, op1
);
1002 gimple_set_location (mult_stmt
, loc
);
1003 gsi_insert_before (gsi
, mult_stmt
, GSI_SAME_STMT
);
1008 /* Convert ARG0**N to a tree of multiplications of ARG0 with itself.
1009 This function needs to be kept in sync with powi_cost above. */
1012 powi_as_mults (gimple_stmt_iterator
*gsi
, location_t loc
,
1013 tree arg0
, HOST_WIDE_INT n
)
1015 tree cache
[POWI_TABLE_SIZE
], result
, type
= TREE_TYPE (arg0
);
1020 return build_real (type
, dconst1
);
1022 memset (cache
, 0, sizeof (cache
));
1025 result
= powi_as_mults_1 (gsi
, loc
, type
, (n
< 0) ? -n
: n
, cache
);
1029 /* If the original exponent was negative, reciprocate the result. */
1030 target
= make_temp_ssa_name (type
, NULL
, "powmult");
1031 div_stmt
= gimple_build_assign_with_ops (RDIV_EXPR
, target
,
1032 build_real (type
, dconst1
),
1034 gimple_set_location (div_stmt
, loc
);
1035 gsi_insert_before (gsi
, div_stmt
, GSI_SAME_STMT
);
1040 /* ARG0 and N are the two arguments to a powi builtin in GSI with
1041 location info LOC. If the arguments are appropriate, create an
1042 equivalent sequence of statements prior to GSI using an optimal
1043 number of multiplications, and return an expession holding the
1047 gimple_expand_builtin_powi (gimple_stmt_iterator
*gsi
, location_t loc
,
1048 tree arg0
, HOST_WIDE_INT n
)
1050 /* Avoid largest negative number. */
1052 && ((n
>= -1 && n
<= 2)
1053 || (optimize_function_for_speed_p (cfun
)
1054 && powi_cost (n
) <= POWI_MAX_MULTS
)))
1055 return powi_as_mults (gsi
, loc
, arg0
, n
);
1060 /* Build a gimple call statement that calls FN with argument ARG.
1061 Set the lhs of the call statement to a fresh SSA name. Insert the
1062 statement prior to GSI's current position, and return the fresh
1066 build_and_insert_call (gimple_stmt_iterator
*gsi
, location_t loc
,
1072 call_stmt
= gimple_build_call (fn
, 1, arg
);
1073 ssa_target
= make_temp_ssa_name (TREE_TYPE (arg
), NULL
, "powroot");
1074 gimple_set_lhs (call_stmt
, ssa_target
);
1075 gimple_set_location (call_stmt
, loc
);
1076 gsi_insert_before (gsi
, call_stmt
, GSI_SAME_STMT
);
1081 /* Build a gimple binary operation with the given CODE and arguments
1082 ARG0, ARG1, assigning the result to a new SSA name for variable
1083 TARGET. Insert the statement prior to GSI's current position, and
1084 return the fresh SSA name.*/
1087 build_and_insert_binop (gimple_stmt_iterator
*gsi
, location_t loc
,
1088 const char *name
, enum tree_code code
,
1089 tree arg0
, tree arg1
)
1091 tree result
= make_temp_ssa_name (TREE_TYPE (arg0
), NULL
, name
);
1092 gimple stmt
= gimple_build_assign_with_ops (code
, result
, arg0
, arg1
);
1093 gimple_set_location (stmt
, loc
);
1094 gsi_insert_before (gsi
, stmt
, GSI_SAME_STMT
);
1098 /* Build a gimple reference operation with the given CODE and argument
1099 ARG, assigning the result to a new SSA name of TYPE with NAME.
1100 Insert the statement prior to GSI's current position, and return
1101 the fresh SSA name. */
1104 build_and_insert_ref (gimple_stmt_iterator
*gsi
, location_t loc
, tree type
,
1105 const char *name
, enum tree_code code
, tree arg0
)
1107 tree result
= make_temp_ssa_name (type
, NULL
, name
);
1108 gimple stmt
= gimple_build_assign (result
, build1 (code
, type
, arg0
));
1109 gimple_set_location (stmt
, loc
);
1110 gsi_insert_before (gsi
, stmt
, GSI_SAME_STMT
);
1114 /* Build a gimple assignment to cast VAL to TYPE. Insert the statement
1115 prior to GSI's current position, and return the fresh SSA name. */
1118 build_and_insert_cast (gimple_stmt_iterator
*gsi
, location_t loc
,
1119 tree type
, tree val
)
1121 tree result
= make_ssa_name (type
, NULL
);
1122 gimple stmt
= gimple_build_assign_with_ops (NOP_EXPR
, result
, val
, NULL_TREE
);
1123 gimple_set_location (stmt
, loc
);
1124 gsi_insert_before (gsi
, stmt
, GSI_SAME_STMT
);
1128 /* ARG0 and ARG1 are the two arguments to a pow builtin call in GSI
1129 with location info LOC. If possible, create an equivalent and
1130 less expensive sequence of statements prior to GSI, and return an
1131 expession holding the result. */
1134 gimple_expand_builtin_pow (gimple_stmt_iterator
*gsi
, location_t loc
,
1135 tree arg0
, tree arg1
)
1137 REAL_VALUE_TYPE c
, cint
, dconst1_4
, dconst3_4
, dconst1_3
, dconst1_6
;
1138 REAL_VALUE_TYPE c2
, dconst3
;
1140 tree type
, sqrtfn
, cbrtfn
, sqrt_arg0
, sqrt_sqrt
, result
, cbrt_x
, powi_cbrt_x
;
1141 enum machine_mode mode
;
1142 bool hw_sqrt_exists
, c_is_int
, c2_is_int
;
1144 /* If the exponent isn't a constant, there's nothing of interest
1146 if (TREE_CODE (arg1
) != REAL_CST
)
1149 /* If the exponent is equivalent to an integer, expand to an optimal
1150 multiplication sequence when profitable. */
1151 c
= TREE_REAL_CST (arg1
);
1152 n
= real_to_integer (&c
);
1153 real_from_integer (&cint
, VOIDmode
, n
, SIGNED
);
1154 c_is_int
= real_identical (&c
, &cint
);
1157 && ((n
>= -1 && n
<= 2)
1158 || (flag_unsafe_math_optimizations
1159 && optimize_bb_for_speed_p (gsi_bb (*gsi
))
1160 && powi_cost (n
) <= POWI_MAX_MULTS
)))
1161 return gimple_expand_builtin_powi (gsi
, loc
, arg0
, n
);
1163 /* Attempt various optimizations using sqrt and cbrt. */
1164 type
= TREE_TYPE (arg0
);
1165 mode
= TYPE_MODE (type
);
1166 sqrtfn
= mathfn_built_in (type
, BUILT_IN_SQRT
);
1168 /* Optimize pow(x,0.5) = sqrt(x). This replacement is always safe
1169 unless signed zeros must be maintained. pow(-0,0.5) = +0, while
1172 && REAL_VALUES_EQUAL (c
, dconsthalf
)
1173 && !HONOR_SIGNED_ZEROS (mode
))
1174 return build_and_insert_call (gsi
, loc
, sqrtfn
, arg0
);
1176 /* Optimize pow(x,0.25) = sqrt(sqrt(x)). Assume on most machines that
1177 a builtin sqrt instruction is smaller than a call to pow with 0.25,
1178 so do this optimization even if -Os. Don't do this optimization
1179 if we don't have a hardware sqrt insn. */
1180 dconst1_4
= dconst1
;
1181 SET_REAL_EXP (&dconst1_4
, REAL_EXP (&dconst1_4
) - 2);
1182 hw_sqrt_exists
= optab_handler (sqrt_optab
, mode
) != CODE_FOR_nothing
;
1184 if (flag_unsafe_math_optimizations
1186 && REAL_VALUES_EQUAL (c
, dconst1_4
)
1190 sqrt_arg0
= build_and_insert_call (gsi
, loc
, sqrtfn
, arg0
);
1193 return build_and_insert_call (gsi
, loc
, sqrtfn
, sqrt_arg0
);
1196 /* Optimize pow(x,0.75) = sqrt(x) * sqrt(sqrt(x)) unless we are
1197 optimizing for space. Don't do this optimization if we don't have
1198 a hardware sqrt insn. */
1199 real_from_integer (&dconst3_4
, VOIDmode
, 3, SIGNED
);
1200 SET_REAL_EXP (&dconst3_4
, REAL_EXP (&dconst3_4
) - 2);
1202 if (flag_unsafe_math_optimizations
1204 && optimize_function_for_speed_p (cfun
)
1205 && REAL_VALUES_EQUAL (c
, dconst3_4
)
1209 sqrt_arg0
= build_and_insert_call (gsi
, loc
, sqrtfn
, arg0
);
1212 sqrt_sqrt
= build_and_insert_call (gsi
, loc
, sqrtfn
, sqrt_arg0
);
1214 /* sqrt(x) * sqrt(sqrt(x)) */
1215 return build_and_insert_binop (gsi
, loc
, "powroot", MULT_EXPR
,
1216 sqrt_arg0
, sqrt_sqrt
);
1219 /* Optimize pow(x,1./3.) = cbrt(x). This requires unsafe math
1220 optimizations since 1./3. is not exactly representable. If x
1221 is negative and finite, the correct value of pow(x,1./3.) is
1222 a NaN with the "invalid" exception raised, because the value
1223 of 1./3. actually has an even denominator. The correct value
1224 of cbrt(x) is a negative real value. */
1225 cbrtfn
= mathfn_built_in (type
, BUILT_IN_CBRT
);
1226 dconst1_3
= real_value_truncate (mode
, dconst_third ());
1228 if (flag_unsafe_math_optimizations
1230 && (gimple_val_nonnegative_real_p (arg0
) || !HONOR_NANS (mode
))
1231 && REAL_VALUES_EQUAL (c
, dconst1_3
))
1232 return build_and_insert_call (gsi
, loc
, cbrtfn
, arg0
);
1234 /* Optimize pow(x,1./6.) = cbrt(sqrt(x)). Don't do this optimization
1235 if we don't have a hardware sqrt insn. */
1236 dconst1_6
= dconst1_3
;
1237 SET_REAL_EXP (&dconst1_6
, REAL_EXP (&dconst1_6
) - 1);
1239 if (flag_unsafe_math_optimizations
1242 && (gimple_val_nonnegative_real_p (arg0
) || !HONOR_NANS (mode
))
1243 && optimize_function_for_speed_p (cfun
)
1245 && REAL_VALUES_EQUAL (c
, dconst1_6
))
1248 sqrt_arg0
= build_and_insert_call (gsi
, loc
, sqrtfn
, arg0
);
1251 return build_and_insert_call (gsi
, loc
, cbrtfn
, sqrt_arg0
);
1254 /* Optimize pow(x,c), where n = 2c for some nonzero integer n
1255 and c not an integer, into
1257 sqrt(x) * powi(x, n/2), n > 0;
1258 1.0 / (sqrt(x) * powi(x, abs(n/2))), n < 0.
1260 Do not calculate the powi factor when n/2 = 0. */
1261 real_arithmetic (&c2
, MULT_EXPR
, &c
, &dconst2
);
1262 n
= real_to_integer (&c2
);
1263 real_from_integer (&cint
, VOIDmode
, n
, SIGNED
);
1264 c2_is_int
= real_identical (&c2
, &cint
);
1266 if (flag_unsafe_math_optimizations
1270 && optimize_function_for_speed_p (cfun
))
1272 tree powi_x_ndiv2
= NULL_TREE
;
1274 /* Attempt to fold powi(arg0, abs(n/2)) into multiplies. If not
1275 possible or profitable, give up. Skip the degenerate case when
1276 n is 1 or -1, where the result is always 1. */
1277 if (absu_hwi (n
) != 1)
1279 powi_x_ndiv2
= gimple_expand_builtin_powi (gsi
, loc
, arg0
,
1285 /* Calculate sqrt(x). When n is not 1 or -1, multiply it by the
1286 result of the optimal multiply sequence just calculated. */
1287 sqrt_arg0
= build_and_insert_call (gsi
, loc
, sqrtfn
, arg0
);
1289 if (absu_hwi (n
) == 1)
1292 result
= build_and_insert_binop (gsi
, loc
, "powroot", MULT_EXPR
,
1293 sqrt_arg0
, powi_x_ndiv2
);
1295 /* If n is negative, reciprocate the result. */
1297 result
= build_and_insert_binop (gsi
, loc
, "powroot", RDIV_EXPR
,
1298 build_real (type
, dconst1
), result
);
1302 /* Optimize pow(x,c), where 3c = n for some nonzero integer n, into
1304 powi(x, n/3) * powi(cbrt(x), n%3), n > 0;
1305 1.0 / (powi(x, abs(n)/3) * powi(cbrt(x), abs(n)%3)), n < 0.
1307 Do not calculate the first factor when n/3 = 0. As cbrt(x) is
1308 different from pow(x, 1./3.) due to rounding and behavior with
1309 negative x, we need to constrain this transformation to unsafe
1310 math and positive x or finite math. */
1311 real_from_integer (&dconst3
, VOIDmode
, 3, SIGNED
);
1312 real_arithmetic (&c2
, MULT_EXPR
, &c
, &dconst3
);
1313 real_round (&c2
, mode
, &c2
);
1314 n
= real_to_integer (&c2
);
1315 real_from_integer (&cint
, VOIDmode
, n
, SIGNED
);
1316 real_arithmetic (&c2
, RDIV_EXPR
, &cint
, &dconst3
);
1317 real_convert (&c2
, mode
, &c2
);
1319 if (flag_unsafe_math_optimizations
1321 && (gimple_val_nonnegative_real_p (arg0
) || !HONOR_NANS (mode
))
1322 && real_identical (&c2
, &c
)
1324 && optimize_function_for_speed_p (cfun
)
1325 && powi_cost (n
/ 3) <= POWI_MAX_MULTS
)
1327 tree powi_x_ndiv3
= NULL_TREE
;
1329 /* Attempt to fold powi(arg0, abs(n/3)) into multiplies. If not
1330 possible or profitable, give up. Skip the degenerate case when
1331 abs(n) < 3, where the result is always 1. */
1332 if (absu_hwi (n
) >= 3)
1334 powi_x_ndiv3
= gimple_expand_builtin_powi (gsi
, loc
, arg0
,
1340 /* Calculate powi(cbrt(x), n%3). Don't use gimple_expand_builtin_powi
1341 as that creates an unnecessary variable. Instead, just produce
1342 either cbrt(x) or cbrt(x) * cbrt(x). */
1343 cbrt_x
= build_and_insert_call (gsi
, loc
, cbrtfn
, arg0
);
1345 if (absu_hwi (n
) % 3 == 1)
1346 powi_cbrt_x
= cbrt_x
;
1348 powi_cbrt_x
= build_and_insert_binop (gsi
, loc
, "powroot", MULT_EXPR
,
1351 /* Multiply the two subexpressions, unless powi(x,abs(n)/3) = 1. */
1352 if (absu_hwi (n
) < 3)
1353 result
= powi_cbrt_x
;
1355 result
= build_and_insert_binop (gsi
, loc
, "powroot", MULT_EXPR
,
1356 powi_x_ndiv3
, powi_cbrt_x
);
1358 /* If n is negative, reciprocate the result. */
1360 result
= build_and_insert_binop (gsi
, loc
, "powroot", RDIV_EXPR
,
1361 build_real (type
, dconst1
), result
);
1366 /* No optimizations succeeded. */
1370 /* ARG is the argument to a cabs builtin call in GSI with location info
1371 LOC. Create a sequence of statements prior to GSI that calculates
1372 sqrt(R*R + I*I), where R and I are the real and imaginary components
1373 of ARG, respectively. Return an expression holding the result. */
1376 gimple_expand_builtin_cabs (gimple_stmt_iterator
*gsi
, location_t loc
, tree arg
)
1378 tree real_part
, imag_part
, addend1
, addend2
, sum
, result
;
1379 tree type
= TREE_TYPE (TREE_TYPE (arg
));
1380 tree sqrtfn
= mathfn_built_in (type
, BUILT_IN_SQRT
);
1381 enum machine_mode mode
= TYPE_MODE (type
);
1383 if (!flag_unsafe_math_optimizations
1384 || !optimize_bb_for_speed_p (gimple_bb (gsi_stmt (*gsi
)))
1386 || optab_handler (sqrt_optab
, mode
) == CODE_FOR_nothing
)
1389 real_part
= build_and_insert_ref (gsi
, loc
, type
, "cabs",
1390 REALPART_EXPR
, arg
);
1391 addend1
= build_and_insert_binop (gsi
, loc
, "cabs", MULT_EXPR
,
1392 real_part
, real_part
);
1393 imag_part
= build_and_insert_ref (gsi
, loc
, type
, "cabs",
1394 IMAGPART_EXPR
, arg
);
1395 addend2
= build_and_insert_binop (gsi
, loc
, "cabs", MULT_EXPR
,
1396 imag_part
, imag_part
);
1397 sum
= build_and_insert_binop (gsi
, loc
, "cabs", PLUS_EXPR
, addend1
, addend2
);
1398 result
= build_and_insert_call (gsi
, loc
, sqrtfn
, sum
);
1403 /* Go through all calls to sin, cos and cexpi and call execute_cse_sincos_1
1404 on the SSA_NAME argument of each of them. Also expand powi(x,n) into
1405 an optimal number of multiplies, when n is a constant. */
1409 const pass_data pass_data_cse_sincos
=
1411 GIMPLE_PASS
, /* type */
1412 "sincos", /* name */
1413 OPTGROUP_NONE
, /* optinfo_flags */
1414 true, /* has_execute */
1415 TV_NONE
, /* tv_id */
1416 PROP_ssa
, /* properties_required */
1417 0, /* properties_provided */
1418 0, /* properties_destroyed */
1419 0, /* todo_flags_start */
1420 TODO_update_ssa
, /* todo_flags_finish */
1423 class pass_cse_sincos
: public gimple_opt_pass
1426 pass_cse_sincos (gcc::context
*ctxt
)
1427 : gimple_opt_pass (pass_data_cse_sincos
, ctxt
)
1430 /* opt_pass methods: */
1431 virtual bool gate (function
*)
1433 /* We no longer require either sincos or cexp, since powi expansion
1434 piggybacks on this pass. */
1438 virtual unsigned int execute (function
*);
1440 }; // class pass_cse_sincos
1443 pass_cse_sincos::execute (function
*fun
)
1446 bool cfg_changed
= false;
1448 calculate_dominance_info (CDI_DOMINATORS
);
1449 memset (&sincos_stats
, 0, sizeof (sincos_stats
));
1451 FOR_EACH_BB_FN (bb
, fun
)
1453 gimple_stmt_iterator gsi
;
1454 bool cleanup_eh
= false;
1456 for (gsi
= gsi_after_labels (bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
1458 gimple stmt
= gsi_stmt (gsi
);
1461 /* Only the last stmt in a bb could throw, no need to call
1462 gimple_purge_dead_eh_edges if we change something in the middle
1463 of a basic block. */
1466 if (is_gimple_call (stmt
)
1467 && gimple_call_lhs (stmt
)
1468 && (fndecl
= gimple_call_fndecl (stmt
))
1469 && DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_NORMAL
)
1471 tree arg
, arg0
, arg1
, result
;
1475 switch (DECL_FUNCTION_CODE (fndecl
))
1477 CASE_FLT_FN (BUILT_IN_COS
):
1478 CASE_FLT_FN (BUILT_IN_SIN
):
1479 CASE_FLT_FN (BUILT_IN_CEXPI
):
1480 /* Make sure we have either sincos or cexp. */
1481 if (!targetm
.libc_has_function (function_c99_math_complex
)
1482 && !targetm
.libc_has_function (function_sincos
))
1485 arg
= gimple_call_arg (stmt
, 0);
1486 if (TREE_CODE (arg
) == SSA_NAME
)
1487 cfg_changed
|= execute_cse_sincos_1 (arg
);
1490 CASE_FLT_FN (BUILT_IN_POW
):
1491 arg0
= gimple_call_arg (stmt
, 0);
1492 arg1
= gimple_call_arg (stmt
, 1);
1494 loc
= gimple_location (stmt
);
1495 result
= gimple_expand_builtin_pow (&gsi
, loc
, arg0
, arg1
);
1499 tree lhs
= gimple_get_lhs (stmt
);
1500 gimple new_stmt
= gimple_build_assign (lhs
, result
);
1501 gimple_set_location (new_stmt
, loc
);
1502 unlink_stmt_vdef (stmt
);
1503 gsi_replace (&gsi
, new_stmt
, true);
1505 if (gimple_vdef (stmt
))
1506 release_ssa_name (gimple_vdef (stmt
));
1510 CASE_FLT_FN (BUILT_IN_POWI
):
1511 arg0
= gimple_call_arg (stmt
, 0);
1512 arg1
= gimple_call_arg (stmt
, 1);
1513 loc
= gimple_location (stmt
);
1515 if (real_minus_onep (arg0
))
1517 tree t0
, t1
, cond
, one
, minus_one
;
1520 t0
= TREE_TYPE (arg0
);
1521 t1
= TREE_TYPE (arg1
);
1522 one
= build_real (t0
, dconst1
);
1523 minus_one
= build_real (t0
, dconstm1
);
1525 cond
= make_temp_ssa_name (t1
, NULL
, "powi_cond");
1526 stmt
= gimple_build_assign_with_ops (BIT_AND_EXPR
, cond
,
1530 gimple_set_location (stmt
, loc
);
1531 gsi_insert_before (&gsi
, stmt
, GSI_SAME_STMT
);
1533 result
= make_temp_ssa_name (t0
, NULL
, "powi");
1534 stmt
= gimple_build_assign_with_ops (COND_EXPR
, result
,
1537 gimple_set_location (stmt
, loc
);
1538 gsi_insert_before (&gsi
, stmt
, GSI_SAME_STMT
);
1542 if (!tree_fits_shwi_p (arg1
))
1545 n
= tree_to_shwi (arg1
);
1546 result
= gimple_expand_builtin_powi (&gsi
, loc
, arg0
, n
);
1551 tree lhs
= gimple_get_lhs (stmt
);
1552 gimple new_stmt
= gimple_build_assign (lhs
, result
);
1553 gimple_set_location (new_stmt
, loc
);
1554 unlink_stmt_vdef (stmt
);
1555 gsi_replace (&gsi
, new_stmt
, true);
1557 if (gimple_vdef (stmt
))
1558 release_ssa_name (gimple_vdef (stmt
));
1562 CASE_FLT_FN (BUILT_IN_CABS
):
1563 arg0
= gimple_call_arg (stmt
, 0);
1564 loc
= gimple_location (stmt
);
1565 result
= gimple_expand_builtin_cabs (&gsi
, loc
, arg0
);
1569 tree lhs
= gimple_get_lhs (stmt
);
1570 gimple new_stmt
= gimple_build_assign (lhs
, result
);
1571 gimple_set_location (new_stmt
, loc
);
1572 unlink_stmt_vdef (stmt
);
1573 gsi_replace (&gsi
, new_stmt
, true);
1575 if (gimple_vdef (stmt
))
1576 release_ssa_name (gimple_vdef (stmt
));
1585 cfg_changed
|= gimple_purge_dead_eh_edges (bb
);
1588 statistics_counter_event (fun
, "sincos statements inserted",
1589 sincos_stats
.inserted
);
1591 free_dominance_info (CDI_DOMINATORS
);
1592 return cfg_changed
? TODO_cleanup_cfg
: 0;
1598 make_pass_cse_sincos (gcc::context
*ctxt
)
1600 return new pass_cse_sincos (ctxt
);
1603 /* A symbolic number is used to detect byte permutation and selection
1604 patterns. Therefore the field N contains an artificial number
1605 consisting of byte size markers:
1607 0 - byte has the value 0
1608 1..size - byte contains the content of the byte
1609 number indexed with that value minus one.
1611 To detect permutations on memory sources (arrays and structures), a symbolic
1612 number is also associated a base address (the array or structure the load is
1613 made from), an offset from the base address and a range which gives the
1614 difference between the highest and lowest accessed memory location to make
1615 such a symbolic number. The range is thus different from size which reflects
1616 the size of the type of current expression. Note that for non memory source,
1617 range holds the same value as size.
1619 For instance, for an array char a[], (short) a[0] | (short) a[3] would have
1620 a size of 2 but a range of 4 while (short) a[0] | ((short) a[0] << 1) would
1621 still have a size of 2 but this time a range of 1. */
1623 struct symbolic_number
{
1628 HOST_WIDE_INT bytepos
;
1631 unsigned HOST_WIDE_INT range
;
1634 /* The number which the find_bswap_or_nop_1 result should match in
1635 order to have a nop. The number is masked according to the size of
1636 the symbolic number before using it. */
1637 #define CMPNOP (sizeof (int64_t) < 8 ? 0 : \
1638 (uint64_t)0x08070605 << 32 | 0x04030201)
1640 /* The number which the find_bswap_or_nop_1 result should match in
1641 order to have a byte swap. The number is masked according to the
1642 size of the symbolic number before using it. */
1643 #define CMPXCHG (sizeof (int64_t) < 8 ? 0 : \
1644 (uint64_t)0x01020304 << 32 | 0x05060708)
1646 /* Perform a SHIFT or ROTATE operation by COUNT bits on symbolic
1647 number N. Return false if the requested operation is not permitted
1648 on a symbolic number. */
1651 do_shift_rotate (enum tree_code code
,
1652 struct symbolic_number
*n
,
1655 int bitsize
= TYPE_PRECISION (n
->type
);
1660 /* Zero out the extra bits of N in order to avoid them being shifted
1661 into the significant bits. */
1662 if (bitsize
< 8 * (int)sizeof (int64_t))
1663 n
->n
&= ((uint64_t)1 << bitsize
) - 1;
1671 /* Arithmetic shift of signed type: result is dependent on the value. */
1672 if (!TYPE_UNSIGNED (n
->type
) && (n
->n
& (0xff << (bitsize
- 8))))
1677 n
->n
= (n
->n
<< count
) | (n
->n
>> (bitsize
- count
));
1680 n
->n
= (n
->n
>> count
) | (n
->n
<< (bitsize
- count
));
1685 /* Zero unused bits for size. */
1686 if (bitsize
< 8 * (int)sizeof (int64_t))
1687 n
->n
&= ((uint64_t)1 << bitsize
) - 1;
1691 /* Perform sanity checking for the symbolic number N and the gimple
1695 verify_symbolic_number_p (struct symbolic_number
*n
, gimple stmt
)
1699 lhs_type
= gimple_expr_type (stmt
);
1701 if (TREE_CODE (lhs_type
) != INTEGER_TYPE
)
1704 if (TYPE_PRECISION (lhs_type
) != TYPE_PRECISION (n
->type
))
1710 /* Initialize the symbolic number N for the bswap pass from the base element
1711 SRC manipulated by the bitwise OR expression. */
1714 init_symbolic_number (struct symbolic_number
*n
, tree src
)
1718 n
->base_addr
= n
->offset
= n
->alias_set
= n
->vuse
= NULL_TREE
;
1720 /* Set up the symbolic number N by setting each byte to a value between 1 and
1721 the byte size of rhs1. The highest order byte is set to n->size and the
1722 lowest order byte to 1. */
1723 n
->type
= TREE_TYPE (src
);
1724 size
= TYPE_PRECISION (n
->type
);
1725 if (size
% BITS_PER_UNIT
!= 0)
1727 size
/= BITS_PER_UNIT
;
1728 if (size
> (int)sizeof (uint64_t))
1733 if (size
< (int)sizeof (int64_t))
1734 n
->n
&= ((uint64_t)1 << (size
* BITS_PER_UNIT
)) - 1;
1739 /* Check if STMT might be a byte swap or a nop from a memory source and returns
1740 the answer. If so, REF is that memory source and the base of the memory area
1741 accessed and the offset of the access from that base are recorded in N. */
1744 find_bswap_or_nop_load (gimple stmt
, tree ref
, struct symbolic_number
*n
)
1746 /* Leaf node is an array or component ref. Memorize its base and
1747 offset from base to compare to other such leaf node. */
1748 HOST_WIDE_INT bitsize
, bitpos
;
1749 enum machine_mode mode
;
1750 int unsignedp
, volatilep
;
1751 tree offset
, base_addr
;
1753 if (!gimple_assign_load_p (stmt
) || gimple_has_volatile_ops (stmt
))
1756 base_addr
= get_inner_reference (ref
, &bitsize
, &bitpos
, &offset
, &mode
,
1757 &unsignedp
, &volatilep
, false);
1759 if (TREE_CODE (base_addr
) == MEM_REF
)
1761 offset_int bit_offset
= 0;
1762 tree off
= TREE_OPERAND (base_addr
, 1);
1764 if (!integer_zerop (off
))
1766 offset_int boff
, coff
= mem_ref_offset (base_addr
);
1767 boff
= wi::lshift (coff
, LOG2_BITS_PER_UNIT
);
1771 base_addr
= TREE_OPERAND (base_addr
, 0);
1773 /* Avoid returning a negative bitpos as this may wreak havoc later. */
1774 if (wi::neg_p (bit_offset
))
1776 offset_int mask
= wi::mask
<offset_int
> (LOG2_BITS_PER_UNIT
, false);
1777 offset_int tem
= bit_offset
.and_not (mask
);
1778 /* TEM is the bitpos rounded to BITS_PER_UNIT towards -Inf.
1779 Subtract it to BIT_OFFSET and add it (scaled) to OFFSET. */
1781 tem
= wi::arshift (tem
, LOG2_BITS_PER_UNIT
);
1783 offset
= size_binop (PLUS_EXPR
, offset
,
1784 wide_int_to_tree (sizetype
, tem
));
1786 offset
= wide_int_to_tree (sizetype
, tem
);
1789 bitpos
+= bit_offset
.to_shwi ();
1792 if (bitpos
% BITS_PER_UNIT
)
1794 if (bitsize
% BITS_PER_UNIT
)
1797 if (!init_symbolic_number (n
, ref
))
1799 n
->base_addr
= base_addr
;
1801 n
->bytepos
= bitpos
/ BITS_PER_UNIT
;
1802 n
->alias_set
= reference_alias_ptr_type (ref
);
1803 n
->vuse
= gimple_vuse (stmt
);
1807 /* find_bswap_or_nop_1 invokes itself recursively with N and tries to perform
1808 the operation given by the rhs of STMT on the result. If the operation
1809 could successfully be executed the function returns a gimple stmt whose
1810 rhs's first tree is the expression of the source operand and NULL
1814 find_bswap_or_nop_1 (gimple stmt
, struct symbolic_number
*n
, int limit
)
1816 enum tree_code code
;
1817 tree rhs1
, rhs2
= NULL
;
1818 gimple rhs1_stmt
, rhs2_stmt
, source_stmt1
;
1819 enum gimple_rhs_class rhs_class
;
1821 if (!limit
|| !is_gimple_assign (stmt
))
1824 rhs1
= gimple_assign_rhs1 (stmt
);
1826 if (find_bswap_or_nop_load (stmt
, rhs1
, n
))
1829 if (TREE_CODE (rhs1
) != SSA_NAME
)
1832 code
= gimple_assign_rhs_code (stmt
);
1833 rhs_class
= gimple_assign_rhs_class (stmt
);
1834 rhs1_stmt
= SSA_NAME_DEF_STMT (rhs1
);
1836 if (rhs_class
== GIMPLE_BINARY_RHS
)
1837 rhs2
= gimple_assign_rhs2 (stmt
);
1839 /* Handle unary rhs and binary rhs with integer constants as second
1842 if (rhs_class
== GIMPLE_UNARY_RHS
1843 || (rhs_class
== GIMPLE_BINARY_RHS
1844 && TREE_CODE (rhs2
) == INTEGER_CST
))
1846 if (code
!= BIT_AND_EXPR
1847 && code
!= LSHIFT_EXPR
1848 && code
!= RSHIFT_EXPR
1849 && code
!= LROTATE_EXPR
1850 && code
!= RROTATE_EXPR
1852 && code
!= CONVERT_EXPR
)
1855 source_stmt1
= find_bswap_or_nop_1 (rhs1_stmt
, n
, limit
- 1);
1857 /* If find_bswap_or_nop_1 returned NULL, STMT is a leaf node and
1858 we have to initialize the symbolic number. */
1861 if (gimple_assign_load_p (stmt
)
1862 || !init_symbolic_number (n
, rhs1
))
1864 source_stmt1
= stmt
;
1871 int i
, size
= TYPE_PRECISION (n
->type
) / BITS_PER_UNIT
;
1872 uint64_t val
= int_cst_value (rhs2
);
1875 /* Only constants masking full bytes are allowed. */
1876 for (i
= 0; i
< size
; i
++, tmp
>>= BITS_PER_UNIT
)
1877 if ((tmp
& 0xff) != 0 && (tmp
& 0xff) != 0xff)
1887 if (!do_shift_rotate (code
, n
, (int)TREE_INT_CST_LOW (rhs2
)))
1892 int type_size
, old_type_size
;
1895 type
= gimple_expr_type (stmt
);
1896 type_size
= TYPE_PRECISION (type
);
1897 if (type_size
% BITS_PER_UNIT
!= 0)
1899 if (type_size
> (int)sizeof (uint64_t) * 8)
1902 /* Sign extension: result is dependent on the value. */
1903 old_type_size
= TYPE_PRECISION (n
->type
);
1904 if (!TYPE_UNSIGNED (n
->type
)
1905 && type_size
> old_type_size
1906 && n
->n
& (0xff << (old_type_size
- 8)))
1909 if (type_size
/ BITS_PER_UNIT
< (int)(sizeof (int64_t)))
1911 /* If STMT casts to a smaller type mask out the bits not
1912 belonging to the target type. */
1913 n
->n
&= ((uint64_t)1 << type_size
) - 1;
1917 n
->range
= type_size
/ BITS_PER_UNIT
;
1923 return verify_symbolic_number_p (n
, stmt
) ? source_stmt1
: NULL
;
1926 /* Handle binary rhs. */
1928 if (rhs_class
== GIMPLE_BINARY_RHS
)
1931 struct symbolic_number n1
, n2
;
1933 gimple source_stmt2
;
1935 if (code
!= BIT_IOR_EXPR
)
1938 if (TREE_CODE (rhs2
) != SSA_NAME
)
1941 rhs2_stmt
= SSA_NAME_DEF_STMT (rhs2
);
1946 source_stmt1
= find_bswap_or_nop_1 (rhs1_stmt
, &n1
, limit
- 1);
1951 source_stmt2
= find_bswap_or_nop_1 (rhs2_stmt
, &n2
, limit
- 1);
1956 if (TYPE_PRECISION (n1
.type
) != TYPE_PRECISION (n2
.type
))
1959 if (!n1
.vuse
!= !n2
.vuse
||
1960 (n1
.vuse
&& !operand_equal_p (n1
.vuse
, n2
.vuse
, 0)))
1963 if (gimple_assign_rhs1 (source_stmt1
)
1964 != gimple_assign_rhs1 (source_stmt2
))
1968 HOST_WIDE_INT off_sub
;
1969 struct symbolic_number
*n_ptr
;
1971 if (!n1
.base_addr
|| !n2
.base_addr
1972 || !operand_equal_p (n1
.base_addr
, n2
.base_addr
, 0))
1974 if (!n1
.offset
!= !n2
.offset
||
1975 (n1
.offset
&& !operand_equal_p (n1
.offset
, n2
.offset
, 0)))
1978 /* We swap n1 with n2 to have n1 < n2. */
1979 if (n2
.bytepos
< n1
.bytepos
)
1981 struct symbolic_number tmpn
;
1986 source_stmt1
= source_stmt2
;
1989 off_sub
= n2
.bytepos
- n1
.bytepos
;
1991 /* Check that the range of memory covered < biggest int size. */
1992 if (off_sub
+ n2
.range
> (int) sizeof (int64_t))
1994 n
->range
= n2
.range
+ off_sub
;
1996 /* Reinterpret byte marks in symbolic number holding the value of
1997 bigger weight according to target endianness. */
1998 inc
= BYTES_BIG_ENDIAN
? off_sub
+ n2
.range
- n1
.range
: off_sub
;
2000 if (BYTES_BIG_ENDIAN
)
2004 for (i
= 0; i
< sizeof (int64_t); i
++, inc
<<= 8,
2007 if (n_ptr
->n
& mask
)
2012 n
->range
= n1
.range
;
2015 || alias_ptr_types_compatible_p (n1
.alias_set
, n2
.alias_set
))
2016 n
->alias_set
= n1
.alias_set
;
2018 n
->alias_set
= ptr_type_node
;
2020 n
->base_addr
= n1
.base_addr
;
2021 n
->offset
= n1
.offset
;
2022 n
->bytepos
= n1
.bytepos
;
2024 size
= TYPE_PRECISION (n
->type
) / BITS_PER_UNIT
;
2025 for (i
= 0, mask
= 0xff; i
< size
; i
++, mask
<<= BITS_PER_UNIT
)
2027 uint64_t masked1
, masked2
;
2029 masked1
= n1
.n
& mask
;
2030 masked2
= n2
.n
& mask
;
2031 if (masked1
&& masked2
&& masked1
!= masked2
)
2036 if (!verify_symbolic_number_p (n
, stmt
))
2043 return source_stmt1
;
2048 /* Check if STMT completes a bswap implementation or a read in a given
2049 endianness consisting of ORs, SHIFTs and ANDs and sets *BSWAP
2050 accordingly. It also sets N to represent the kind of operations
2051 performed: size of the resulting expression and whether it works on
2052 a memory source, and if so alias-set and vuse. At last, the
2053 function returns a stmt whose rhs's first tree is the source
2057 find_bswap_or_nop (gimple stmt
, struct symbolic_number
*n
, bool *bswap
)
2059 /* The number which the find_bswap_or_nop_1 result should match in order
2060 to have a full byte swap. The number is shifted to the right
2061 according to the size of the symbolic number before using it. */
2062 uint64_t cmpxchg
= CMPXCHG
;
2063 uint64_t cmpnop
= CMPNOP
;
2068 /* The last parameter determines the depth search limit. It usually
2069 correlates directly to the number n of bytes to be touched. We
2070 increase that number by log2(n) + 1 here in order to also
2071 cover signed -> unsigned conversions of the src operand as can be seen
2072 in libgcc, and for initial shift/and operation of the src operand. */
2073 limit
= TREE_INT_CST_LOW (TYPE_SIZE_UNIT (gimple_expr_type (stmt
)));
2074 limit
+= 1 + (int) ceil_log2 ((unsigned HOST_WIDE_INT
) limit
);
2075 source_stmt
= find_bswap_or_nop_1 (stmt
, n
, limit
);
2080 /* Find real size of result (highest non zero byte). */
2086 for (tmpn
= n
->n
, rsize
= 0; tmpn
; tmpn
>>= BITS_PER_UNIT
, rsize
++);
2090 /* Zero out the extra bits of N and CMP*. */
2091 if (n
->range
< (int)sizeof (int64_t))
2095 mask
= ((uint64_t)1 << (n
->range
* BITS_PER_UNIT
)) - 1;
2096 cmpxchg
>>= (sizeof (int64_t) - n
->range
) * BITS_PER_UNIT
;
2100 /* A complete byte swap should make the symbolic number to start with
2101 the largest digit in the highest order byte. Unchanged symbolic
2102 number indicates a read with same endianness as target architecture. */
2105 else if (n
->n
== cmpxchg
)
2110 /* Useless bit manipulation performed by code. */
2111 if (!n
->base_addr
&& n
->n
== cmpnop
)
2114 n
->range
*= BITS_PER_UNIT
;
2120 const pass_data pass_data_optimize_bswap
=
2122 GIMPLE_PASS
, /* type */
2124 OPTGROUP_NONE
, /* optinfo_flags */
2125 true, /* has_execute */
2126 TV_NONE
, /* tv_id */
2127 PROP_ssa
, /* properties_required */
2128 0, /* properties_provided */
2129 0, /* properties_destroyed */
2130 0, /* todo_flags_start */
2131 0, /* todo_flags_finish */
2134 class pass_optimize_bswap
: public gimple_opt_pass
2137 pass_optimize_bswap (gcc::context
*ctxt
)
2138 : gimple_opt_pass (pass_data_optimize_bswap
, ctxt
)
2141 /* opt_pass methods: */
2142 virtual bool gate (function
*)
2144 return flag_expensive_optimizations
&& optimize
;
2147 virtual unsigned int execute (function
*);
2149 }; // class pass_optimize_bswap
2151 /* Perform the bswap optimization: replace the statement CUR_STMT at
2152 GSI with a load of type, VUSE and set-alias as described by N if a
2153 memory source is involved (N->base_addr is non null), followed by
2154 the builtin bswap invocation in FNDECL if BSWAP is true. SRC_STMT
2155 gives where should the replacement be made. It also gives the
2156 source on which CUR_STMT is operating via its rhs's first tree nad
2157 N->range gives the size of the expression involved for maintaining
2161 bswap_replace (gimple cur_stmt
, gimple_stmt_iterator gsi
, gimple src_stmt
,
2162 tree fndecl
, tree bswap_type
, tree load_type
,
2163 struct symbolic_number
*n
, bool bswap
)
2168 src
= gimple_assign_rhs1 (src_stmt
);
2169 tgt
= gimple_assign_lhs (cur_stmt
);
2171 /* Need to load the value from memory first. */
2174 gimple_stmt_iterator gsi_ins
= gsi_for_stmt (src_stmt
);
2175 tree addr_expr
, addr_tmp
, val_expr
, val_tmp
;
2176 tree load_offset_ptr
, aligned_load_type
;
2177 gimple addr_stmt
, load_stmt
;
2180 align
= get_object_alignment (src
);
2181 if (bswap
&& SLOW_UNALIGNED_ACCESS (TYPE_MODE (load_type
), align
))
2184 gsi_move_before (&gsi
, &gsi_ins
);
2185 gsi
= gsi_for_stmt (cur_stmt
);
2187 /* Compute address to load from and cast according to the size
2189 addr_expr
= build_fold_addr_expr (unshare_expr (src
));
2190 if (is_gimple_min_invariant (addr_expr
))
2191 addr_tmp
= addr_expr
;
2194 addr_tmp
= make_temp_ssa_name (TREE_TYPE (addr_expr
), NULL
,
2196 addr_stmt
= gimple_build_assign (addr_tmp
, addr_expr
);
2197 gsi_insert_before (&gsi
, addr_stmt
, GSI_SAME_STMT
);
2200 /* Perform the load. */
2201 aligned_load_type
= load_type
;
2202 if (align
< TYPE_ALIGN (load_type
))
2203 aligned_load_type
= build_aligned_type (load_type
, align
);
2204 load_offset_ptr
= build_int_cst (n
->alias_set
, 0);
2205 val_expr
= fold_build2 (MEM_REF
, aligned_load_type
, addr_tmp
,
2211 nop_stats
.found_16bit
++;
2212 else if (n
->range
== 32)
2213 nop_stats
.found_32bit
++;
2216 gcc_assert (n
->range
== 64);
2217 nop_stats
.found_64bit
++;
2220 /* Convert the result of load if necessary. */
2221 if (!useless_type_conversion_p (TREE_TYPE (tgt
), load_type
))
2223 val_tmp
= make_temp_ssa_name (aligned_load_type
, NULL
,
2225 load_stmt
= gimple_build_assign (val_tmp
, val_expr
);
2226 gimple_set_vuse (load_stmt
, n
->vuse
);
2227 gsi_insert_before (&gsi
, load_stmt
, GSI_SAME_STMT
);
2228 gimple_assign_set_rhs_with_ops_1 (&gsi
, NOP_EXPR
, val_tmp
,
2229 NULL_TREE
, NULL_TREE
);
2233 gimple_assign_set_rhs_with_ops_1 (&gsi
, MEM_REF
, val_expr
,
2234 NULL_TREE
, NULL_TREE
);
2235 gimple_set_vuse (cur_stmt
, n
->vuse
);
2237 update_stmt (cur_stmt
);
2242 "%d bit load in target endianness found at: ",
2244 print_gimple_stmt (dump_file
, cur_stmt
, 0, 0);
2250 val_tmp
= make_temp_ssa_name (aligned_load_type
, NULL
, "load_dst");
2251 load_stmt
= gimple_build_assign (val_tmp
, val_expr
);
2252 gimple_set_vuse (load_stmt
, n
->vuse
);
2253 gsi_insert_before (&gsi
, load_stmt
, GSI_SAME_STMT
);
2259 bswap_stats
.found_16bit
++;
2260 else if (n
->range
== 32)
2261 bswap_stats
.found_32bit
++;
2264 gcc_assert (n
->range
== 64);
2265 bswap_stats
.found_64bit
++;
2270 /* Convert the src expression if necessary. */
2271 if (!useless_type_conversion_p (TREE_TYPE (tmp
), bswap_type
))
2273 gimple convert_stmt
;
2274 tmp
= make_temp_ssa_name (bswap_type
, NULL
, "bswapsrc");
2275 convert_stmt
= gimple_build_assign_with_ops (NOP_EXPR
, tmp
, src
, NULL
);
2276 gsi_insert_before (&gsi
, convert_stmt
, GSI_SAME_STMT
);
2279 call
= gimple_build_call (fndecl
, 1, tmp
);
2283 /* Convert the result if necessary. */
2284 if (!useless_type_conversion_p (TREE_TYPE (tgt
), bswap_type
))
2286 gimple convert_stmt
;
2287 tmp
= make_temp_ssa_name (bswap_type
, NULL
, "bswapdst");
2288 convert_stmt
= gimple_build_assign_with_ops (NOP_EXPR
, tgt
, tmp
, NULL
);
2289 gsi_insert_after (&gsi
, convert_stmt
, GSI_SAME_STMT
);
2292 gimple_call_set_lhs (call
, tmp
);
2296 fprintf (dump_file
, "%d bit bswap implementation found at: ",
2298 print_gimple_stmt (dump_file
, cur_stmt
, 0, 0);
2301 gsi_insert_after (&gsi
, call
, GSI_SAME_STMT
);
2302 gsi_remove (&gsi
, true);
2306 /* Find manual byte swap implementations as well as load in a given
2307 endianness. Byte swaps are turned into a bswap builtin invokation
2308 while endian loads are converted to bswap builtin invokation or
2309 simple load according to the target endianness. */
2312 pass_optimize_bswap::execute (function
*fun
)
2315 bool bswap16_p
, bswap32_p
, bswap64_p
;
2316 bool changed
= false;
2317 tree bswap16_type
= NULL_TREE
, bswap32_type
= NULL_TREE
, bswap64_type
= NULL_TREE
;
2319 if (BITS_PER_UNIT
!= 8)
2322 bswap16_p
= (builtin_decl_explicit_p (BUILT_IN_BSWAP16
)
2323 && optab_handler (bswap_optab
, HImode
) != CODE_FOR_nothing
);
2324 bswap32_p
= (builtin_decl_explicit_p (BUILT_IN_BSWAP32
)
2325 && optab_handler (bswap_optab
, SImode
) != CODE_FOR_nothing
);
2326 bswap64_p
= (builtin_decl_explicit_p (BUILT_IN_BSWAP64
)
2327 && (optab_handler (bswap_optab
, DImode
) != CODE_FOR_nothing
2328 || (bswap32_p
&& word_mode
== SImode
)));
2330 /* Determine the argument type of the builtins. The code later on
2331 assumes that the return and argument type are the same. */
2334 tree fndecl
= builtin_decl_explicit (BUILT_IN_BSWAP16
);
2335 bswap16_type
= TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)));
2340 tree fndecl
= builtin_decl_explicit (BUILT_IN_BSWAP32
);
2341 bswap32_type
= TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)));
2346 tree fndecl
= builtin_decl_explicit (BUILT_IN_BSWAP64
);
2347 bswap64_type
= TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)));
2350 memset (&nop_stats
, 0, sizeof (nop_stats
));
2351 memset (&bswap_stats
, 0, sizeof (bswap_stats
));
2353 FOR_EACH_BB_FN (bb
, fun
)
2355 gimple_stmt_iterator gsi
;
2357 /* We do a reverse scan for bswap patterns to make sure we get the
2358 widest match. As bswap pattern matching doesn't handle
2359 previously inserted smaller bswap replacements as sub-
2360 patterns, the wider variant wouldn't be detected. */
2361 for (gsi
= gsi_last_bb (bb
); !gsi_end_p (gsi
); gsi_prev (&gsi
))
2363 gimple src_stmt
, cur_stmt
= gsi_stmt (gsi
);
2364 tree fndecl
= NULL_TREE
, bswap_type
= NULL_TREE
, load_type
;
2365 struct symbolic_number n
;
2368 if (!is_gimple_assign (cur_stmt
)
2369 || gimple_assign_rhs_code (cur_stmt
) != BIT_IOR_EXPR
)
2372 src_stmt
= find_bswap_or_nop (cur_stmt
, &n
, &bswap
);
2380 load_type
= uint16_type_node
;
2383 fndecl
= builtin_decl_explicit (BUILT_IN_BSWAP16
);
2384 bswap_type
= bswap16_type
;
2388 load_type
= uint32_type_node
;
2391 fndecl
= builtin_decl_explicit (BUILT_IN_BSWAP32
);
2392 bswap_type
= bswap32_type
;
2396 load_type
= uint64_type_node
;
2399 fndecl
= builtin_decl_explicit (BUILT_IN_BSWAP64
);
2400 bswap_type
= bswap64_type
;
2407 if (bswap
&& !fndecl
)
2410 if (bswap_replace (cur_stmt
, gsi
, src_stmt
, fndecl
, bswap_type
,
2411 load_type
, &n
, bswap
))
2416 statistics_counter_event (fun
, "16-bit nop implementations found",
2417 nop_stats
.found_16bit
);
2418 statistics_counter_event (fun
, "32-bit nop implementations found",
2419 nop_stats
.found_32bit
);
2420 statistics_counter_event (fun
, "64-bit nop implementations found",
2421 nop_stats
.found_64bit
);
2422 statistics_counter_event (fun
, "16-bit bswap implementations found",
2423 bswap_stats
.found_16bit
);
2424 statistics_counter_event (fun
, "32-bit bswap implementations found",
2425 bswap_stats
.found_32bit
);
2426 statistics_counter_event (fun
, "64-bit bswap implementations found",
2427 bswap_stats
.found_64bit
);
2429 return (changed
? TODO_update_ssa
: 0);
2435 make_pass_optimize_bswap (gcc::context
*ctxt
)
2437 return new pass_optimize_bswap (ctxt
);
2440 /* Return true if stmt is a type conversion operation that can be stripped
2441 when used in a widening multiply operation. */
2443 widening_mult_conversion_strippable_p (tree result_type
, gimple stmt
)
2445 enum tree_code rhs_code
= gimple_assign_rhs_code (stmt
);
2447 if (TREE_CODE (result_type
) == INTEGER_TYPE
)
2452 if (!CONVERT_EXPR_CODE_P (rhs_code
))
2455 op_type
= TREE_TYPE (gimple_assign_lhs (stmt
));
2457 /* If the type of OP has the same precision as the result, then
2458 we can strip this conversion. The multiply operation will be
2459 selected to create the correct extension as a by-product. */
2460 if (TYPE_PRECISION (result_type
) == TYPE_PRECISION (op_type
))
2463 /* We can also strip a conversion if it preserves the signed-ness of
2464 the operation and doesn't narrow the range. */
2465 inner_op_type
= TREE_TYPE (gimple_assign_rhs1 (stmt
));
2467 /* If the inner-most type is unsigned, then we can strip any
2468 intermediate widening operation. If it's signed, then the
2469 intermediate widening operation must also be signed. */
2470 if ((TYPE_UNSIGNED (inner_op_type
)
2471 || TYPE_UNSIGNED (op_type
) == TYPE_UNSIGNED (inner_op_type
))
2472 && TYPE_PRECISION (op_type
) > TYPE_PRECISION (inner_op_type
))
2478 return rhs_code
== FIXED_CONVERT_EXPR
;
2481 /* Return true if RHS is a suitable operand for a widening multiplication,
2482 assuming a target type of TYPE.
2483 There are two cases:
2485 - RHS makes some value at least twice as wide. Store that value
2486 in *NEW_RHS_OUT if so, and store its type in *TYPE_OUT.
2488 - RHS is an integer constant. Store that value in *NEW_RHS_OUT if so,
2489 but leave *TYPE_OUT untouched. */
2492 is_widening_mult_rhs_p (tree type
, tree rhs
, tree
*type_out
,
2498 if (TREE_CODE (rhs
) == SSA_NAME
)
2500 stmt
= SSA_NAME_DEF_STMT (rhs
);
2501 if (is_gimple_assign (stmt
))
2503 if (! widening_mult_conversion_strippable_p (type
, stmt
))
2507 rhs1
= gimple_assign_rhs1 (stmt
);
2509 if (TREE_CODE (rhs1
) == INTEGER_CST
)
2511 *new_rhs_out
= rhs1
;
2520 type1
= TREE_TYPE (rhs1
);
2522 if (TREE_CODE (type1
) != TREE_CODE (type
)
2523 || TYPE_PRECISION (type1
) * 2 > TYPE_PRECISION (type
))
2526 *new_rhs_out
= rhs1
;
2531 if (TREE_CODE (rhs
) == INTEGER_CST
)
2541 /* Return true if STMT performs a widening multiplication, assuming the
2542 output type is TYPE. If so, store the unwidened types of the operands
2543 in *TYPE1_OUT and *TYPE2_OUT respectively. Also fill *RHS1_OUT and
2544 *RHS2_OUT such that converting those operands to types *TYPE1_OUT
2545 and *TYPE2_OUT would give the operands of the multiplication. */
2548 is_widening_mult_p (gimple stmt
,
2549 tree
*type1_out
, tree
*rhs1_out
,
2550 tree
*type2_out
, tree
*rhs2_out
)
2552 tree type
= TREE_TYPE (gimple_assign_lhs (stmt
));
2554 if (TREE_CODE (type
) != INTEGER_TYPE
2555 && TREE_CODE (type
) != FIXED_POINT_TYPE
)
2558 if (!is_widening_mult_rhs_p (type
, gimple_assign_rhs1 (stmt
), type1_out
,
2562 if (!is_widening_mult_rhs_p (type
, gimple_assign_rhs2 (stmt
), type2_out
,
2566 if (*type1_out
== NULL
)
2568 if (*type2_out
== NULL
|| !int_fits_type_p (*rhs1_out
, *type2_out
))
2570 *type1_out
= *type2_out
;
2573 if (*type2_out
== NULL
)
2575 if (!int_fits_type_p (*rhs2_out
, *type1_out
))
2577 *type2_out
= *type1_out
;
2580 /* Ensure that the larger of the two operands comes first. */
2581 if (TYPE_PRECISION (*type1_out
) < TYPE_PRECISION (*type2_out
))
2585 *type1_out
= *type2_out
;
2588 *rhs1_out
= *rhs2_out
;
2595 /* Process a single gimple statement STMT, which has a MULT_EXPR as
2596 its rhs, and try to convert it into a WIDEN_MULT_EXPR. The return
2597 value is true iff we converted the statement. */
2600 convert_mult_to_widen (gimple stmt
, gimple_stmt_iterator
*gsi
)
2602 tree lhs
, rhs1
, rhs2
, type
, type1
, type2
;
2603 enum insn_code handler
;
2604 enum machine_mode to_mode
, from_mode
, actual_mode
;
2606 int actual_precision
;
2607 location_t loc
= gimple_location (stmt
);
2608 bool from_unsigned1
, from_unsigned2
;
2610 lhs
= gimple_assign_lhs (stmt
);
2611 type
= TREE_TYPE (lhs
);
2612 if (TREE_CODE (type
) != INTEGER_TYPE
)
2615 if (!is_widening_mult_p (stmt
, &type1
, &rhs1
, &type2
, &rhs2
))
2618 to_mode
= TYPE_MODE (type
);
2619 from_mode
= TYPE_MODE (type1
);
2620 from_unsigned1
= TYPE_UNSIGNED (type1
);
2621 from_unsigned2
= TYPE_UNSIGNED (type2
);
2623 if (from_unsigned1
&& from_unsigned2
)
2624 op
= umul_widen_optab
;
2625 else if (!from_unsigned1
&& !from_unsigned2
)
2626 op
= smul_widen_optab
;
2628 op
= usmul_widen_optab
;
2630 handler
= find_widening_optab_handler_and_mode (op
, to_mode
, from_mode
,
2633 if (handler
== CODE_FOR_nothing
)
2635 if (op
!= smul_widen_optab
)
2637 /* We can use a signed multiply with unsigned types as long as
2638 there is a wider mode to use, or it is the smaller of the two
2639 types that is unsigned. Note that type1 >= type2, always. */
2640 if ((TYPE_UNSIGNED (type1
)
2641 && TYPE_PRECISION (type1
) == GET_MODE_PRECISION (from_mode
))
2642 || (TYPE_UNSIGNED (type2
)
2643 && TYPE_PRECISION (type2
) == GET_MODE_PRECISION (from_mode
)))
2645 from_mode
= GET_MODE_WIDER_MODE (from_mode
);
2646 if (GET_MODE_SIZE (to_mode
) <= GET_MODE_SIZE (from_mode
))
2650 op
= smul_widen_optab
;
2651 handler
= find_widening_optab_handler_and_mode (op
, to_mode
,
2655 if (handler
== CODE_FOR_nothing
)
2658 from_unsigned1
= from_unsigned2
= false;
2664 /* Ensure that the inputs to the handler are in the correct precison
2665 for the opcode. This will be the full mode size. */
2666 actual_precision
= GET_MODE_PRECISION (actual_mode
);
2667 if (2 * actual_precision
> TYPE_PRECISION (type
))
2669 if (actual_precision
!= TYPE_PRECISION (type1
)
2670 || from_unsigned1
!= TYPE_UNSIGNED (type1
))
2671 rhs1
= build_and_insert_cast (gsi
, loc
,
2672 build_nonstandard_integer_type
2673 (actual_precision
, from_unsigned1
), rhs1
);
2674 if (actual_precision
!= TYPE_PRECISION (type2
)
2675 || from_unsigned2
!= TYPE_UNSIGNED (type2
))
2676 rhs2
= build_and_insert_cast (gsi
, loc
,
2677 build_nonstandard_integer_type
2678 (actual_precision
, from_unsigned2
), rhs2
);
2680 /* Handle constants. */
2681 if (TREE_CODE (rhs1
) == INTEGER_CST
)
2682 rhs1
= fold_convert (type1
, rhs1
);
2683 if (TREE_CODE (rhs2
) == INTEGER_CST
)
2684 rhs2
= fold_convert (type2
, rhs2
);
2686 gimple_assign_set_rhs1 (stmt
, rhs1
);
2687 gimple_assign_set_rhs2 (stmt
, rhs2
);
2688 gimple_assign_set_rhs_code (stmt
, WIDEN_MULT_EXPR
);
2690 widen_mul_stats
.widen_mults_inserted
++;
2694 /* Process a single gimple statement STMT, which is found at the
2695 iterator GSI and has a either a PLUS_EXPR or a MINUS_EXPR as its
2696 rhs (given by CODE), and try to convert it into a
2697 WIDEN_MULT_PLUS_EXPR or a WIDEN_MULT_MINUS_EXPR. The return value
2698 is true iff we converted the statement. */
2701 convert_plusminus_to_widen (gimple_stmt_iterator
*gsi
, gimple stmt
,
2702 enum tree_code code
)
2704 gimple rhs1_stmt
= NULL
, rhs2_stmt
= NULL
;
2705 gimple conv1_stmt
= NULL
, conv2_stmt
= NULL
, conv_stmt
;
2706 tree type
, type1
, type2
, optype
;
2707 tree lhs
, rhs1
, rhs2
, mult_rhs1
, mult_rhs2
, add_rhs
;
2708 enum tree_code rhs1_code
= ERROR_MARK
, rhs2_code
= ERROR_MARK
;
2710 enum tree_code wmult_code
;
2711 enum insn_code handler
;
2712 enum machine_mode to_mode
, from_mode
, actual_mode
;
2713 location_t loc
= gimple_location (stmt
);
2714 int actual_precision
;
2715 bool from_unsigned1
, from_unsigned2
;
2717 lhs
= gimple_assign_lhs (stmt
);
2718 type
= TREE_TYPE (lhs
);
2719 if (TREE_CODE (type
) != INTEGER_TYPE
2720 && TREE_CODE (type
) != FIXED_POINT_TYPE
)
2723 if (code
== MINUS_EXPR
)
2724 wmult_code
= WIDEN_MULT_MINUS_EXPR
;
2726 wmult_code
= WIDEN_MULT_PLUS_EXPR
;
2728 rhs1
= gimple_assign_rhs1 (stmt
);
2729 rhs2
= gimple_assign_rhs2 (stmt
);
2731 if (TREE_CODE (rhs1
) == SSA_NAME
)
2733 rhs1_stmt
= SSA_NAME_DEF_STMT (rhs1
);
2734 if (is_gimple_assign (rhs1_stmt
))
2735 rhs1_code
= gimple_assign_rhs_code (rhs1_stmt
);
2738 if (TREE_CODE (rhs2
) == SSA_NAME
)
2740 rhs2_stmt
= SSA_NAME_DEF_STMT (rhs2
);
2741 if (is_gimple_assign (rhs2_stmt
))
2742 rhs2_code
= gimple_assign_rhs_code (rhs2_stmt
);
2745 /* Allow for one conversion statement between the multiply
2746 and addition/subtraction statement. If there are more than
2747 one conversions then we assume they would invalidate this
2748 transformation. If that's not the case then they should have
2749 been folded before now. */
2750 if (CONVERT_EXPR_CODE_P (rhs1_code
))
2752 conv1_stmt
= rhs1_stmt
;
2753 rhs1
= gimple_assign_rhs1 (rhs1_stmt
);
2754 if (TREE_CODE (rhs1
) == SSA_NAME
)
2756 rhs1_stmt
= SSA_NAME_DEF_STMT (rhs1
);
2757 if (is_gimple_assign (rhs1_stmt
))
2758 rhs1_code
= gimple_assign_rhs_code (rhs1_stmt
);
2763 if (CONVERT_EXPR_CODE_P (rhs2_code
))
2765 conv2_stmt
= rhs2_stmt
;
2766 rhs2
= gimple_assign_rhs1 (rhs2_stmt
);
2767 if (TREE_CODE (rhs2
) == SSA_NAME
)
2769 rhs2_stmt
= SSA_NAME_DEF_STMT (rhs2
);
2770 if (is_gimple_assign (rhs2_stmt
))
2771 rhs2_code
= gimple_assign_rhs_code (rhs2_stmt
);
2777 /* If code is WIDEN_MULT_EXPR then it would seem unnecessary to call
2778 is_widening_mult_p, but we still need the rhs returns.
2780 It might also appear that it would be sufficient to use the existing
2781 operands of the widening multiply, but that would limit the choice of
2782 multiply-and-accumulate instructions.
2784 If the widened-multiplication result has more than one uses, it is
2785 probably wiser not to do the conversion. */
2786 if (code
== PLUS_EXPR
2787 && (rhs1_code
== MULT_EXPR
|| rhs1_code
== WIDEN_MULT_EXPR
))
2789 if (!has_single_use (rhs1
)
2790 || !is_widening_mult_p (rhs1_stmt
, &type1
, &mult_rhs1
,
2791 &type2
, &mult_rhs2
))
2794 conv_stmt
= conv1_stmt
;
2796 else if (rhs2_code
== MULT_EXPR
|| rhs2_code
== WIDEN_MULT_EXPR
)
2798 if (!has_single_use (rhs2
)
2799 || !is_widening_mult_p (rhs2_stmt
, &type1
, &mult_rhs1
,
2800 &type2
, &mult_rhs2
))
2803 conv_stmt
= conv2_stmt
;
2808 to_mode
= TYPE_MODE (type
);
2809 from_mode
= TYPE_MODE (type1
);
2810 from_unsigned1
= TYPE_UNSIGNED (type1
);
2811 from_unsigned2
= TYPE_UNSIGNED (type2
);
2814 /* There's no such thing as a mixed sign madd yet, so use a wider mode. */
2815 if (from_unsigned1
!= from_unsigned2
)
2817 if (!INTEGRAL_TYPE_P (type
))
2819 /* We can use a signed multiply with unsigned types as long as
2820 there is a wider mode to use, or it is the smaller of the two
2821 types that is unsigned. Note that type1 >= type2, always. */
2823 && TYPE_PRECISION (type1
) == GET_MODE_PRECISION (from_mode
))
2825 && TYPE_PRECISION (type2
) == GET_MODE_PRECISION (from_mode
)))
2827 from_mode
= GET_MODE_WIDER_MODE (from_mode
);
2828 if (GET_MODE_SIZE (from_mode
) >= GET_MODE_SIZE (to_mode
))
2832 from_unsigned1
= from_unsigned2
= false;
2833 optype
= build_nonstandard_integer_type (GET_MODE_PRECISION (from_mode
),
2837 /* If there was a conversion between the multiply and addition
2838 then we need to make sure it fits a multiply-and-accumulate.
2839 The should be a single mode change which does not change the
2843 /* We use the original, unmodified data types for this. */
2844 tree from_type
= TREE_TYPE (gimple_assign_rhs1 (conv_stmt
));
2845 tree to_type
= TREE_TYPE (gimple_assign_lhs (conv_stmt
));
2846 int data_size
= TYPE_PRECISION (type1
) + TYPE_PRECISION (type2
);
2847 bool is_unsigned
= TYPE_UNSIGNED (type1
) && TYPE_UNSIGNED (type2
);
2849 if (TYPE_PRECISION (from_type
) > TYPE_PRECISION (to_type
))
2851 /* Conversion is a truncate. */
2852 if (TYPE_PRECISION (to_type
) < data_size
)
2855 else if (TYPE_PRECISION (from_type
) < TYPE_PRECISION (to_type
))
2857 /* Conversion is an extend. Check it's the right sort. */
2858 if (TYPE_UNSIGNED (from_type
) != is_unsigned
2859 && !(is_unsigned
&& TYPE_PRECISION (from_type
) > data_size
))
2862 /* else convert is a no-op for our purposes. */
2865 /* Verify that the machine can perform a widening multiply
2866 accumulate in this mode/signedness combination, otherwise
2867 this transformation is likely to pessimize code. */
2868 this_optab
= optab_for_tree_code (wmult_code
, optype
, optab_default
);
2869 handler
= find_widening_optab_handler_and_mode (this_optab
, to_mode
,
2870 from_mode
, 0, &actual_mode
);
2872 if (handler
== CODE_FOR_nothing
)
2875 /* Ensure that the inputs to the handler are in the correct precison
2876 for the opcode. This will be the full mode size. */
2877 actual_precision
= GET_MODE_PRECISION (actual_mode
);
2878 if (actual_precision
!= TYPE_PRECISION (type1
)
2879 || from_unsigned1
!= TYPE_UNSIGNED (type1
))
2880 mult_rhs1
= build_and_insert_cast (gsi
, loc
,
2881 build_nonstandard_integer_type
2882 (actual_precision
, from_unsigned1
),
2884 if (actual_precision
!= TYPE_PRECISION (type2
)
2885 || from_unsigned2
!= TYPE_UNSIGNED (type2
))
2886 mult_rhs2
= build_and_insert_cast (gsi
, loc
,
2887 build_nonstandard_integer_type
2888 (actual_precision
, from_unsigned2
),
2891 if (!useless_type_conversion_p (type
, TREE_TYPE (add_rhs
)))
2892 add_rhs
= build_and_insert_cast (gsi
, loc
, type
, add_rhs
);
2894 /* Handle constants. */
2895 if (TREE_CODE (mult_rhs1
) == INTEGER_CST
)
2896 mult_rhs1
= fold_convert (type1
, mult_rhs1
);
2897 if (TREE_CODE (mult_rhs2
) == INTEGER_CST
)
2898 mult_rhs2
= fold_convert (type2
, mult_rhs2
);
2900 gimple_assign_set_rhs_with_ops_1 (gsi
, wmult_code
, mult_rhs1
, mult_rhs2
,
2902 update_stmt (gsi_stmt (*gsi
));
2903 widen_mul_stats
.maccs_inserted
++;
2907 /* Combine the multiplication at MUL_STMT with operands MULOP1 and MULOP2
2908 with uses in additions and subtractions to form fused multiply-add
2909 operations. Returns true if successful and MUL_STMT should be removed. */
2912 convert_mult_to_fma (gimple mul_stmt
, tree op1
, tree op2
)
2914 tree mul_result
= gimple_get_lhs (mul_stmt
);
2915 tree type
= TREE_TYPE (mul_result
);
2916 gimple use_stmt
, neguse_stmt
, fma_stmt
;
2917 use_operand_p use_p
;
2918 imm_use_iterator imm_iter
;
2920 if (FLOAT_TYPE_P (type
)
2921 && flag_fp_contract_mode
== FP_CONTRACT_OFF
)
2924 /* We don't want to do bitfield reduction ops. */
2925 if (INTEGRAL_TYPE_P (type
)
2926 && (TYPE_PRECISION (type
)
2927 != GET_MODE_PRECISION (TYPE_MODE (type
))))
2930 /* If the target doesn't support it, don't generate it. We assume that
2931 if fma isn't available then fms, fnma or fnms are not either. */
2932 if (optab_handler (fma_optab
, TYPE_MODE (type
)) == CODE_FOR_nothing
)
2935 /* If the multiplication has zero uses, it is kept around probably because
2936 of -fnon-call-exceptions. Don't optimize it away in that case,
2938 if (has_zero_uses (mul_result
))
2941 /* Make sure that the multiplication statement becomes dead after
2942 the transformation, thus that all uses are transformed to FMAs.
2943 This means we assume that an FMA operation has the same cost
2945 FOR_EACH_IMM_USE_FAST (use_p
, imm_iter
, mul_result
)
2947 enum tree_code use_code
;
2948 tree result
= mul_result
;
2949 bool negate_p
= false;
2951 use_stmt
= USE_STMT (use_p
);
2953 if (is_gimple_debug (use_stmt
))
2956 /* For now restrict this operations to single basic blocks. In theory
2957 we would want to support sinking the multiplication in
2963 to form a fma in the then block and sink the multiplication to the
2965 if (gimple_bb (use_stmt
) != gimple_bb (mul_stmt
))
2968 if (!is_gimple_assign (use_stmt
))
2971 use_code
= gimple_assign_rhs_code (use_stmt
);
2973 /* A negate on the multiplication leads to FNMA. */
2974 if (use_code
== NEGATE_EXPR
)
2979 result
= gimple_assign_lhs (use_stmt
);
2981 /* Make sure the negate statement becomes dead with this
2982 single transformation. */
2983 if (!single_imm_use (gimple_assign_lhs (use_stmt
),
2984 &use_p
, &neguse_stmt
))
2987 /* Make sure the multiplication isn't also used on that stmt. */
2988 FOR_EACH_PHI_OR_STMT_USE (usep
, neguse_stmt
, iter
, SSA_OP_USE
)
2989 if (USE_FROM_PTR (usep
) == mul_result
)
2993 use_stmt
= neguse_stmt
;
2994 if (gimple_bb (use_stmt
) != gimple_bb (mul_stmt
))
2996 if (!is_gimple_assign (use_stmt
))
2999 use_code
= gimple_assign_rhs_code (use_stmt
);
3006 if (gimple_assign_rhs2 (use_stmt
) == result
)
3007 negate_p
= !negate_p
;
3012 /* FMA can only be formed from PLUS and MINUS. */
3016 /* If the subtrahend (gimple_assign_rhs2 (use_stmt)) is computed
3017 by a MULT_EXPR that we'll visit later, we might be able to
3018 get a more profitable match with fnma.
3019 OTOH, if we don't, a negate / fma pair has likely lower latency
3020 that a mult / subtract pair. */
3021 if (use_code
== MINUS_EXPR
&& !negate_p
3022 && gimple_assign_rhs1 (use_stmt
) == result
3023 && optab_handler (fms_optab
, TYPE_MODE (type
)) == CODE_FOR_nothing
3024 && optab_handler (fnma_optab
, TYPE_MODE (type
)) != CODE_FOR_nothing
)
3026 tree rhs2
= gimple_assign_rhs2 (use_stmt
);
3028 if (TREE_CODE (rhs2
) == SSA_NAME
)
3030 gimple stmt2
= SSA_NAME_DEF_STMT (rhs2
);
3031 if (has_single_use (rhs2
)
3032 && is_gimple_assign (stmt2
)
3033 && gimple_assign_rhs_code (stmt2
) == MULT_EXPR
)
3038 /* We can't handle a * b + a * b. */
3039 if (gimple_assign_rhs1 (use_stmt
) == gimple_assign_rhs2 (use_stmt
))
3042 /* While it is possible to validate whether or not the exact form
3043 that we've recognized is available in the backend, the assumption
3044 is that the transformation is never a loss. For instance, suppose
3045 the target only has the plain FMA pattern available. Consider
3046 a*b-c -> fma(a,b,-c): we've exchanged MUL+SUB for FMA+NEG, which
3047 is still two operations. Consider -(a*b)-c -> fma(-a,b,-c): we
3048 still have 3 operations, but in the FMA form the two NEGs are
3049 independent and could be run in parallel. */
3052 FOR_EACH_IMM_USE_STMT (use_stmt
, imm_iter
, mul_result
)
3054 gimple_stmt_iterator gsi
= gsi_for_stmt (use_stmt
);
3055 enum tree_code use_code
;
3056 tree addop
, mulop1
= op1
, result
= mul_result
;
3057 bool negate_p
= false;
3059 if (is_gimple_debug (use_stmt
))
3062 use_code
= gimple_assign_rhs_code (use_stmt
);
3063 if (use_code
== NEGATE_EXPR
)
3065 result
= gimple_assign_lhs (use_stmt
);
3066 single_imm_use (gimple_assign_lhs (use_stmt
), &use_p
, &neguse_stmt
);
3067 gsi_remove (&gsi
, true);
3068 release_defs (use_stmt
);
3070 use_stmt
= neguse_stmt
;
3071 gsi
= gsi_for_stmt (use_stmt
);
3072 use_code
= gimple_assign_rhs_code (use_stmt
);
3076 if (gimple_assign_rhs1 (use_stmt
) == result
)
3078 addop
= gimple_assign_rhs2 (use_stmt
);
3079 /* a * b - c -> a * b + (-c) */
3080 if (gimple_assign_rhs_code (use_stmt
) == MINUS_EXPR
)
3081 addop
= force_gimple_operand_gsi (&gsi
,
3082 build1 (NEGATE_EXPR
,
3084 true, NULL_TREE
, true,
3089 addop
= gimple_assign_rhs1 (use_stmt
);
3090 /* a - b * c -> (-b) * c + a */
3091 if (gimple_assign_rhs_code (use_stmt
) == MINUS_EXPR
)
3092 negate_p
= !negate_p
;
3096 mulop1
= force_gimple_operand_gsi (&gsi
,
3097 build1 (NEGATE_EXPR
,
3099 true, NULL_TREE
, true,
3102 fma_stmt
= gimple_build_assign_with_ops (FMA_EXPR
,
3103 gimple_assign_lhs (use_stmt
),
3106 gsi_replace (&gsi
, fma_stmt
, true);
3107 widen_mul_stats
.fmas_inserted
++;
3113 /* Find integer multiplications where the operands are extended from
3114 smaller types, and replace the MULT_EXPR with a WIDEN_MULT_EXPR
3115 where appropriate. */
3119 const pass_data pass_data_optimize_widening_mul
=
3121 GIMPLE_PASS
, /* type */
3122 "widening_mul", /* name */
3123 OPTGROUP_NONE
, /* optinfo_flags */
3124 true, /* has_execute */
3125 TV_NONE
, /* tv_id */
3126 PROP_ssa
, /* properties_required */
3127 0, /* properties_provided */
3128 0, /* properties_destroyed */
3129 0, /* todo_flags_start */
3130 TODO_update_ssa
, /* todo_flags_finish */
3133 class pass_optimize_widening_mul
: public gimple_opt_pass
3136 pass_optimize_widening_mul (gcc::context
*ctxt
)
3137 : gimple_opt_pass (pass_data_optimize_widening_mul
, ctxt
)
3140 /* opt_pass methods: */
3141 virtual bool gate (function
*)
3143 return flag_expensive_optimizations
&& optimize
;
3146 virtual unsigned int execute (function
*);
3148 }; // class pass_optimize_widening_mul
3151 pass_optimize_widening_mul::execute (function
*fun
)
3154 bool cfg_changed
= false;
3156 memset (&widen_mul_stats
, 0, sizeof (widen_mul_stats
));
3158 FOR_EACH_BB_FN (bb
, fun
)
3160 gimple_stmt_iterator gsi
;
3162 for (gsi
= gsi_after_labels (bb
); !gsi_end_p (gsi
);)
3164 gimple stmt
= gsi_stmt (gsi
);
3165 enum tree_code code
;
3167 if (is_gimple_assign (stmt
))
3169 code
= gimple_assign_rhs_code (stmt
);
3173 if (!convert_mult_to_widen (stmt
, &gsi
)
3174 && convert_mult_to_fma (stmt
,
3175 gimple_assign_rhs1 (stmt
),
3176 gimple_assign_rhs2 (stmt
)))
3178 gsi_remove (&gsi
, true);
3179 release_defs (stmt
);
3186 convert_plusminus_to_widen (&gsi
, stmt
, code
);
3192 else if (is_gimple_call (stmt
)
3193 && gimple_call_lhs (stmt
))
3195 tree fndecl
= gimple_call_fndecl (stmt
);
3197 && DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_NORMAL
)
3199 switch (DECL_FUNCTION_CODE (fndecl
))
3204 if (TREE_CODE (gimple_call_arg (stmt
, 1)) == REAL_CST
3205 && REAL_VALUES_EQUAL
3206 (TREE_REAL_CST (gimple_call_arg (stmt
, 1)),
3208 && convert_mult_to_fma (stmt
,
3209 gimple_call_arg (stmt
, 0),
3210 gimple_call_arg (stmt
, 0)))
3212 unlink_stmt_vdef (stmt
);
3213 if (gsi_remove (&gsi
, true)
3214 && gimple_purge_dead_eh_edges (bb
))
3216 release_defs (stmt
);
3229 statistics_counter_event (fun
, "widening multiplications inserted",
3230 widen_mul_stats
.widen_mults_inserted
);
3231 statistics_counter_event (fun
, "widening maccs inserted",
3232 widen_mul_stats
.maccs_inserted
);
3233 statistics_counter_event (fun
, "fused multiply-adds inserted",
3234 widen_mul_stats
.fmas_inserted
);
3236 return cfg_changed
? TODO_cleanup_cfg
: 0;
3242 make_pass_optimize_widening_mul (gcc::context
*ctxt
)
3244 return new pass_optimize_widening_mul (ctxt
);