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| author | James A. Morrison <phython@gcc.gnu.org> | 2005-03-11 03:18:56 +0000 |
|---|---|---|
| committer | James A. Morrison <phython@gcc.gnu.org> | 2005-03-11 03:18:56 +0000 |
| commit | 694d73e1659c7db09d415c8ba0ebeb441c0782a8 (patch) | |
| tree | 2c71b62d1a54cb3df4ca245b02f729ad871db5e0 /gcc/fold-const.c | |
| parent | 550b7784c6e4fdf832cca6619f61f0c0f5935d07 (diff) | |
| download | gcc-694d73e1659c7db09d415c8ba0ebeb441c0782a8.zip gcc-694d73e1659c7db09d415c8ba0ebeb441c0782a8.tar.gz gcc-694d73e1659c7db09d415c8ba0ebeb441c0782a8.tar.bz2 | |
re PR tree-optimization/20130 (Fold a * -1 - 1 into ~a;)
2005-03-11 James A. Morrison <phython@gcc.gnu.org>
PR tree-optimization/20130
* fold-const.c (fold): Fold x * -1 into -x.
From-SVN: r96283
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 38fb95d..9d0a9f0 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 |