re PR rtl-optimization/69291 (wrong code at -O1 for…

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

2016-02-16  Richard Biener  <rguenther@suse.de>

	PR rtl-optimization/69291
	* ifcvt.c (noce_try_store_flag_constants): Re-instantiate
	noce_operand_ok check.

From-SVN: r233448

gcc/ChangeLog

+2016-02-16  Richard Biener  <rguenther@suse.de>
+
+	PR rtl-optimization/69291
+	* ifcvt.c (noce_try_store_flag_constants): Re-instantiate
+	noce_operand_ok check.
+
 2016-02-16  Tom de Vries  <tom@codesourcery.com>
 
 	PR lto/67709

gcc/ifcvt.c

@@ -1277,7 +1277,8 @@ noce_try_store_flag_constants (struct noce_if_info *if_info)
       /* 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)))
+	  || (noce_operand_ok (XEXP (a, 0))
+	      && ! reg_overlap_mentioned_p (if_info->x, XEXP (a, 0))))
       && if_info->branch_cost >= 2)
     {
       common = XEXP (a, 0);