diff options
| author | Vlad Lazar <vlad.lazar@arm.com> | 2018-08-30 09:30:49 +0000 |
|---|---|---|
| committer | Vlad Lazar <vladlazar@gcc.gnu.org> | 2018-08-30 09:30:49 +0000 |
| commit | c729951e9c51dabfc3ab7ef864ab2ab8b07b5934 (patch) | |
| tree | 44fac7fc2c3975388678a1bdef9709ff0111e088 /gcc/expmed.c | |
| parent | d0eaed46ce8e5b7c6ebfa0266108cda9cc8fda2e (diff) | |
| download | gcc-c729951e9c51dabfc3ab7ef864ab2ab8b07b5934.zip gcc-c729951e9c51dabfc3ab7ef864ab2ab8b07b5934.tar.gz gcc-c729951e9c51dabfc3ab7ef864ab2ab8b07b5934.tar.bz2 | |
Enable underflow check in canonicalize_comparison. (PR86995)
gcc/
2018-08-30 Vlad Lazar <vlad.lazar@arm.com>
PR middle-end/86995
* expmed.c (canonicalize_comparison): Use wi::sub instead of wi::add
if to_add is negative.
From-SVN: r263973
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 0922029..caf29e8 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -6239,7 +6239,13 @@ canonicalize_comparison (machine_mode mode, enum rtx_code *code, rtx *imm) wrapping around in the case of unsigned values. If any occur cancel the optimization. */ wi::overflow_type overflow = wi::OVF_NONE; - wide_int imm_modif = wi::add (imm_val, to_add, sgn, &overflow); + wide_int imm_modif; + + if (to_add == 1) + imm_modif = wi::add (imm_val, 1, sgn, &overflow); + else + imm_modif = wi::sub (imm_val, 1, sgn, &overflow); + if (overflow) return; |