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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 |