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| author | liuhongt <hongtao.liu@intel.com> | 2022-10-18 16:58:52 +0800 |
|---|---|---|
| committer | liuhongt <hongtao.liu@intel.com> | 2022-10-19 14:09:09 +0800 |
| commit | 1442e2031e0bc2d0a5bf88ef3c92c5410e044bab (patch) | |
| tree | caea9f6fc394c360fb2888ac78817ecc5b21202a /gcc/config | |
| parent | 21de009f741923bc2dcfaa80877b3725e90ab96c (diff) | |
| download | gcc-1442e2031e0bc2d0a5bf88ef3c92c5410e044bab.zip gcc-1442e2031e0bc2d0a5bf88ef3c92c5410e044bab.tar.gz gcc-1442e2031e0bc2d0a5bf88ef3c92c5410e044bab.tar.bz2 | |
Canonicalize vec_perm index to make the first index come from the first vector.
Fix unexpected non-canon form from gimple vector selector.
gcc/ChangeLog:
PR target/107271
* config/i386/i386-expand.cc (ix86_vec_perm_index_canon): New.
(expand_vec_perm_shufps_shufps): Call
ix86_vec_perm_index_canon
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr107271.c: New test.
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/i386/i386-expand.cc | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/config/i386/i386-expand.cc b/gcc/config/i386/i386-expand.cc index a0f8a98..70fd82b 100644 --- a/gcc/config/i386/i386-expand.cc +++ b/gcc/config/i386/i386-expand.cc @@ -19604,6 +19604,22 @@ expand_vec_perm_1 (struct expand_vec_perm_d *d) return false; } +/* Canonicalize vec_perm index to make the first index + always comes from the first vector. */ +static void +ix86_vec_perm_index_canon (struct expand_vec_perm_d *d) +{ + unsigned nelt = d->nelt; + if (d->perm[0] < nelt) + return; + + for (unsigned i = 0; i != nelt; i++) + d->perm[i] = (d->perm[i] + nelt) % (2 * nelt); + + std::swap (d->op0, d->op1); + return; +} + /* A subroutine of ix86_expand_vec_perm_const_1. Try to implement D in terms of a pair of shufps+ shufps/pshufd instructions. */ static bool @@ -19621,6 +19637,7 @@ expand_vec_perm_shufps_shufps (struct expand_vec_perm_d *d) if (d->testing_p) return true; + ix86_vec_perm_index_canon (d); for (i = 0; i < 4; ++i) count += d->perm[i] > 3 ? 1 : 0; |