re PR middle-end/66916 (FAIL: gcc.target/arm/pr43920-2.c object-size text <= 54)

2015-07-23  Richard Biener  <rguenther@suse.de>

	PR middle-end/66916
	* match.pd: Guard widen and sign-change comparison simplification
	with single_use.

From-SVN: r226089

gcc/ChangeLog

 2015-07-23  Richard Biener  <rguenther@suse.de>
 
+	PR middle-end/66916
+	* match.pd: Guard widen and sign-change comparison simplification
+	with single_use.
+
+2015-07-23  Richard Biener  <rguenther@suse.de>
+
 	PR tree-optimization/66945
 	* tree-ssa-propagate.c (substitute_and_fold_dom_walker
 	::before_dom_children): Force the propagators idea of

gcc/match.pd

@@ -1679,7 +1679,8 @@ along with GCC; see the file COPYING3.  If not see
 	  type on targets that require function pointer canonicalization.  */
        && !(targetm.have_canonicalize_funcptr_for_compare ()
 	    && TREE_CODE (TREE_TYPE (@00)) == POINTER_TYPE
-	    && TREE_CODE (TREE_TYPE (TREE_TYPE (@00))) == FUNCTION_TYPE))
+	    && TREE_CODE (TREE_TYPE (TREE_TYPE (@00))) == FUNCTION_TYPE)
+       && single_use (@0))
    (if (TYPE_PRECISION (TREE_TYPE (@00)) == TYPE_PRECISION (TREE_TYPE (@0))
 	&& (TREE_CODE (@10) == INTEGER_CST
 	    || (@1 != @10 && types_match (TREE_TYPE (@10), TREE_TYPE (@00))))