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| author | phython <phython@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-03-11 03:18:56 +0000 |
|---|---|---|
| committer | phython <phython@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-03-11 03:18:56 +0000 |
| commit | 48854785d83ba49184295281e927c400d776c5d9 (patch) | |
| tree | 2c71b62d1a54cb3df4ca245b02f729ad871db5e0 /gcc/fold-const.c | |
| parent | bf0ee60aba3bc52a02fc126a805f3e6c0f3cb3c0 (diff) | |
| download | gcc-48854785d83ba49184295281e927c400d776c5d9.tar.gz | |
2005-03-11 James A. Morrison <phython@gcc.gnu.org>
PR tree-optimization/20130
* fold-const.c (fold): Fold x * -1 into -x.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@96283 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 38fb95d5cfb..9d0a9f02d73 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -7785,6 +7785,9 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1) return omit_one_operand (type, arg1, arg0); if (integer_onep (arg1)) return non_lvalue (fold_convert (type, arg0)); + /* Transform x * -1 into -x. */ + if (integer_all_onesp (arg1)) + return fold_convert (type, negate_expr (arg0)); /* (a * (1 << b)) is (a << b) */ if (TREE_CODE (arg1) == LSHIFT_EXPR |