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| author | Jakub Jelinek <jakub@redhat.com> | 2021-02-13 10:32:16 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2021-02-13 10:32:16 +0100 |
| commit | 0f3a743b688f4845e1798eed9b2e2284e891da11 (patch) | |
| tree | d0ae1048cc10ce9b7db5822a0bebd4ae8921cb88 /libcpp/files.c | |
| parent | fab095dad5e1970ceae598ec9c98b07cce3eb599 (diff) | |
| download | gcc-0f3a743b688f4845e1798eed9b2e2284e891da11.zip gcc-0f3a743b688f4845e1798eed9b2e2284e891da11.tar.gz gcc-0f3a743b688f4845e1798eed9b2e2284e891da11.tar.bz2 | |
i386: Add combiner splitter to optimize V2SImode memory rotation [PR96166]
Since the x86 backend enabled V2SImode vectorization (with
TARGET_MMX_WITH_SSE), slp vectorization can kick in and emit
movq (%rdi), %xmm1
pshufd $225, %xmm1, %xmm0
movq %xmm0, (%rdi)
instead of
rolq $32, (%rdi)
we used to emit (or emit when slp vectorization is disabled).
I think the rotate is both smaller and faster, so this patch adds
a combiner splitter to optimize that back.
2021-02-13 Jakub Jelinek <jakub@redhat.com>
PR target/96166
* config/i386/mmx.md (*mmx_pshufd_1): Add a combine splitter for
swap of V2SImode elements in memory into DImode memory rotate by 32.
* gcc.target/i386/pr96166.c: New test.
Diffstat (limited to 'libcpp/files.c')
0 files changed, 0 insertions, 0 deletions