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re PR rtl-optimization/69291 (wrong code at -O1 for ruby-2.3.0/regcomp.c:985:compile_length_quantifier_node()) 

2016-02-11  Richard Biener  <rguenther@suse.de>

	PR rtl-optimization/69291
	* ifcvt.c (noce_try_store_flag_constants): Do not allow
	subexpressions affected by changing the result.

From-SVN: r233316
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Richard Biener 2016-02-11 08:11:52 +00:00 committed by Richard Biener
parent 168a75879e
commit f167cf54a1
2 changed files with 10 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-02-11 Richard Biener <rguenther@suse.de>
PR rtl-optimization/69291
* ifcvt.c (noce_try_store_flag_constants): Do not allow
subexpressions affected by changing the result.
2016-02-10 Vladimir Makarov <vmakarov@redhat.com>
PR target/69148

5
gcc/ifcvt.c
View File

@ -1274,7 +1274,10 @@ noce_try_store_flag_constants (struct noce_if_info *if_info)
&& CONST_INT_P (XEXP (a, 1))
&& CONST_INT_P (XEXP (b, 1))
&& rtx_equal_p (XEXP (a, 0), XEXP (b, 0))
&& noce_operand_ok (XEXP (a, 0))
/* Allow expressions that are not using the result or plain
registers where we handle overlap below. */
&& (REG_P (XEXP (a, 0))
|| ! reg_overlap_mentioned_p (if_info->x, XEXP (a, 0)))
&& if_info->branch_cost >= 2)
{
common = XEXP (a, 0);