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re PR middle-end/30656 (ICE with -ftrapv)

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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.

From-SVN: r121460
This commit is contained in:
Richard Guenther 2007-02-01 10:27:17 +00:00 • committed by Richard Biener
parent f1b0882e68
commit ee7d8048d5
2 changed files with 7 additions and 1 deletions
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6
gcc/ChangeLog
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@ -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.

2
gcc/fold-const.c
View file

@ -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;