[Bug tree-optimization/85588] [6/7/8/9 Regression] -fwrapv miscompilation
rguenth at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Thu May 3 09:34:00 GMT 2018
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85588
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
A fix is probably as simple as
Index: gcc/fold-const.c
===================================================================
--- gcc/fold-const.c (revision 259879)
+++ gcc/fold-const.c (working copy)
@@ -472,7 +472,7 @@ negate_expr_p (tree t)
case TRUNC_DIV_EXPR:
case ROUND_DIV_EXPR:
case EXACT_DIV_EXPR:
- if (TYPE_UNSIGNED (type))
+ if (TYPE_OVERFLOW_WRAPS (type))
break;
if (negate_expr_p (TREE_OPERAND (t, 0)))
return true;
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