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| author | Jakub Jelinek <jakub@redhat.com> | 2023-12-05 09:08:45 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2023-12-05 09:08:45 +0100 |
| commit | bf418db27c0b48abb8203dd9e08135793cd9ce18 (patch) | |
| tree | 0b0025ed6796575cb26edae8f22b868c35674ddf /gcc/tree-pass.h | |
| parent | 8b93a0f3eb46cbc4ba8eece8eba58aaade4399b6 (diff) | |
| download | gcc-bf418db27c0b48abb8203dd9e08135793cd9ce18.zip gcc-bf418db27c0b48abb8203dd9e08135793cd9ce18.tar.gz gcc-bf418db27c0b48abb8203dd9e08135793cd9ce18.tar.bz2 | |
i386: Improve code generation for vector __builtin_signbit (x.x[i]) ? -1 : 0 [PR112816]
On the testcase I've recently fixed I've noticed bad code generation,
we emit
pxor %xmm1, %xmm1
psrld $31, %xmm0
pcmpeqd %xmm1, %xmm0
pcmpeqd %xmm1, %xmm0
or
vpxor %xmm1, %xmm1, %xmm1
vpsrld $31, %xmm0, %xmm0
vpcmpeqd %xmm1, %xmm0, %xmm0
vpcmpeqd %xmm1, %xmm0, %xmm2
rather than
psrad $31, %xmm2
or
vpsrad $31, %xmm1, %xmm2
The following patch fixes that using a combiner splitter.
2023-12-05 Jakub Jelinek <jakub@redhat.com>
PR target/112816
* config/i386/sse.md ((eq (eq (lshiftrt x elt_bits-1) 0) 0)): New
splitter to turn psrld $31; pcmpeq; pcmpeq into psrad $31.
* gcc.target/i386/pr112816.c: New test.
Diffstat (limited to 'gcc/tree-pass.h')
0 files changed, 0 insertions, 0 deletions