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| author | Marek Polacek <mpolacek@gcc.gnu.org> | 2013-12-04 22:47:11 +0000 |
|---|---|---|
| committer | Marek Polacek <mpolacek@gcc.gnu.org> | 2013-12-04 22:47:11 +0000 |
| commit | 31e071aeb827f49ce2e891620852198e99d44a0c (patch) | |
| tree | 20fca81276f1e6d6224300c11a4e10fa89519d41 /gcc/fold-const.c | |
| parent | 59b6687cceaf95d8c49afee88248cf4fb0a33105 (diff) | |
| download | gcc-31e071aeb827f49ce2e891620852198e99d44a0c.zip gcc-31e071aeb827f49ce2e891620852198e99d44a0c.tar.gz gcc-31e071aeb827f49ce2e891620852198e99d44a0c.tar.bz2 | |
Implement -fsanitize=signed-integer-overflow.
From-SVN: r205684
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 5cf8ed1..0781bdb 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -10350,14 +10350,16 @@ fold_binary_loc (location_t loc, case PLUS_EXPR: /* A + (-B) -> A - B */ - if (TREE_CODE (arg1) == NEGATE_EXPR) + if (TREE_CODE (arg1) == NEGATE_EXPR + && (flag_sanitize & SANITIZE_SI_OVERFLOW) == 0) return fold_build2_loc (loc, MINUS_EXPR, type, fold_convert_loc (loc, type, arg0), fold_convert_loc (loc, type, TREE_OPERAND (arg1, 0))); /* (-A) + B -> B - A */ if (TREE_CODE (arg0) == NEGATE_EXPR - && reorder_operands_p (TREE_OPERAND (arg0, 0), arg1)) + && reorder_operands_p (TREE_OPERAND (arg0, 0), arg1) + && (flag_sanitize & SANITIZE_SI_OVERFLOW) == 0) return fold_build2_loc (loc, MINUS_EXPR, type, fold_convert_loc (loc, type, arg1), fold_convert_loc (loc, type, |