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Index: gcc-4.1.2/gcc/fold-const.c
===================================================================
--- gcc-4.1.2.orig/gcc/fold-const.c 2007-11-21 18:53:42.000000000 +0100
+++ gcc-4.1.2/gcc/fold-const.c 2007-11-21 18:56:26.000000000 +0100
@@ -5339,7 +5339,10 @@
}
break;
}
- /* FALLTHROUGH */
+ /* If the constant is negative, we cannot simplify this. */
+ if (tree_int_cst_sgn (c) == -1)
+ break;
+ /* FALLTHROUGH */
case NEGATE_EXPR:
if ((t1 = extract_muldiv (op0, c, code, wide_type)) != 0)
return fold_build1 (tcode, ctype, fold_convert (ctype, t1));
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