diff options
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/fold-const.c | 2 |
2 files changed, 7 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 56c4ca7..2b6fd69 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2007-02-01 Richard Guenther <rguenther@suse.de> + + PR middle-end/30656 + * fold-const.c (fold_negate_expr): Allow negating a + constant if overflow does not change. + 2007-02-01 Ralf Wildenhues <Ralf.Wildenhues@gmx.de> * doc/c-tree.texi (Expression trees): Improve markup. diff --git a/gcc/fold-const.c b/gcc/fold-const.c index e0cab9c..e3f13e0 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -1109,7 +1109,7 @@ fold_negate_expr (tree t) case INTEGER_CST: tem = fold_negate_const (t, type); - if (!TREE_OVERFLOW (tem) + if (TREE_OVERFLOW (tem) == TREE_OVERFLOW (t) || !TYPE_OVERFLOW_TRAPS (type)) return tem; break; |