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| author | Richard Biener <rguenther@suse.de> | 2022-05-23 11:41:50 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2022-05-24 08:20:11 +0200 |
| commit | d918faea1217596877a35c4946500399731fbbd3 (patch) | |
| tree | f098124df1f68ecd2095ffa6fbc81ba6e696fb59 | |
| parent | 8fa8bca9f53fcfdedc2b4fa55093dbd1ab7abbd1 (diff) | |
| download | gcc-d918faea1217596877a35c4946500399731fbbd3.zip gcc-d918faea1217596877a35c4946500399731fbbd3.tar.gz gcc-d918faea1217596877a35c4946500399731fbbd3.tar.bz2 | |
tree-optimization/105629 - spaceship recognition regression
With the extra GENERIC folding we now do to
(unsigned int) __v._M_value & 1 != (unsigned int) __v._M_value
we end up with a sign-extending conversion to unsigned int
rather than the sign-conversion to unsigned char we expect.
Relaxing that fixes the regression.
2022-05-23 Richard Biener <rguenther@suse.de>
PR tree-optimization/105629
* tree-ssa-phiopt.cc (spaceship_replacement): Allow
a sign-extending conversion.
| -rw-r--r-- | gcc/tree-ssa-phiopt.cc | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/gcc/tree-ssa-phiopt.cc b/gcc/tree-ssa-phiopt.cc index 8c9c46d..e61d973 100644 --- a/gcc/tree-ssa-phiopt.cc +++ b/gcc/tree-ssa-phiopt.cc @@ -2217,7 +2217,7 @@ spaceship_replacement (basic_block cond_bb, basic_block middle_bb, if (!TYPE_UNSIGNED (ty2) || !INTEGRAL_TYPE_P (ty2)) return false; - if (TYPE_PRECISION (ty1) != TYPE_PRECISION (ty2)) + if (TYPE_PRECISION (ty1) > TYPE_PRECISION (ty2)) return false; if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (orig_use_lhs)) return false; |