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[RTL-ifcvt] Reject insns that are multiple_sets 

* ifcvt.c (insn_valid_noce_process_p): Reject insn if it satisfies
	multiple_sets.
	(noce_try_cmove_arith): Add checking asserts that orig_a and orig_b
	are not modified by the final modified insns in the basic blocks.

From-SVN: r231004
This commit is contained in:
Kyrylo Tkachov 2015-11-27 09:52:09 +00:00 committed by Kyrylo Tkachov
parent 14af28ba5a
commit 4d7b2a8a3b
2 changed files with 10 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2015-11-27 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* ifcvt.c (insn_valid_noce_process_p): Reject insn if it satisfies
multiple_sets.
(noce_try_cmove_arith): Add checking asserts that orig_a and orig_b
are not modified by the final modified insns in the basic blocks.
2015-11-27 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
PR rtl-optimization/68506

5
gcc/ifcvt.c
View File

@ -1850,6 +1850,7 @@ insn_valid_noce_process_p (rtx_insn *insn, rtx cc)
{
if (!insn
|| !NONJUMP_INSN_P (insn)
|| multiple_sets (insn)
|| (cc && set_of (cc, insn)))
return false;
@ -2176,7 +2177,7 @@ noce_try_cmove_arith (struct noce_if_info *if_info)
swap insn that sets up A with the one that sets up B. If even
that doesn't help, punt. */
modified_in_a = emit_a != NULL_RTX && modified_in_p (orig_b, emit_a);
gcc_checking_assert (!emit_a || !modified_in_p (orig_b, emit_a));
if (tmp_b && then_bb)
{
FOR_BB_INSNS (then_bb, tmp_insn)
@ -2192,7 +2193,7 @@ noce_try_cmove_arith (struct noce_if_info *if_info)
}
if (emit_a || modified_in_a)
{
modified_in_b = emit_b != NULL_RTX && modified_in_p (orig_a, emit_b);
gcc_checking_assert (!emit_b || !modified_in_p (orig_a, emit_b));
if (tmp_b && else_bb)
{
FOR_BB_INSNS (else_bb, tmp_insn)