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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/105504] Fails to break dependency for vcvtss2sd xmm, xmm, mem
Date: Mon, 07 Aug 2023 01:55:26 +0000 [thread overview]
Message-ID: <bug-105504-4-DwcKQbX7GB@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-105504-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105504
Hongtao.liu <crazylht at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |crazylht at gmail dot com
--- Comment #8 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Eric Gallager from comment #7)
> (In reply to CVS Commits from comment #6)
> > The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:
> >
> > https://gcc.gnu.org/g:5e005393d4ff0a428c5f55b9ba7f65d6078a7cf5
> >
> > commit r13-1009-g5e005393d4ff0a428c5f55b9ba7f65d6078a7cf5
> > Author: liuhongt <hongtao.liu@intel.com>
> > Date: Mon May 30 15:30:51 2022 +0800
> >
> > Disparages SSE_REGS alternatives sligntly with ?v instead of *v in
> > *mov{si,di}_internal.
> >
> > So alternative v won't be igored in record_reg_classess.
> >
> > Similar for *r alternatives in some vector patterns.
> >
> > It helps testcase in the PR, also RA now makes better decisions for
> > gcc.target/i386/extract-insert-combining.c
> >
> > movd %esi, %xmm0
> > movd %edi, %xmm1
> > - movl %esi, -12(%rsp)
> > paddd %xmm0, %xmm1
> > pinsrd $0, %esi, %xmm0
> > paddd %xmm1, %xmm0
> >
> > The patch has no big impact on SPEC2017 for both O2 and Ofast
> > march=native run.
> >
> > And I noticed there's some changes in SPEC2017 from code like
> >
> > mov mem, %eax
> > vmovd %eax, %xmm0
> > ..
> > mov %eax, 64(%rsp)
> >
> > to
> >
> > vmovd mem, %xmm0
> > ..
> > vmovd %xmm0, 64(%rsp)
> >
> > Which should be exactly what we want?
> >
> > gcc/ChangeLog:
> >
> > PR target/105513
> > PR target/105504
> > * config/i386/i386.md (*movsi_internal): Change alternative
> > from *v to ?v.
> > (*movdi_internal): Ditto.
> > * config/i386/sse.md (vec_set<mode>_0): Change alternative *r
> > to ?r.
> > (*vec_extractv4sf_mem): Ditto.
> > (*vec_extracthf): Ditto.
> >
> > gcc/testsuite/ChangeLog:
> >
> > * gcc.target/i386/pr105513-1.c: New test.
> > * gcc.target/i386/extract-insert-combining.c: Add new
> > scan-assembler-not for spill.
>
> Did this fix it?
Yes.
next prev parent reply other threads:[~2023-08-07 1:55 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-06 9:12 [Bug target/105504] New: " amonakov at gcc dot gnu.org
2022-05-07 3:02 ` [Bug target/105504] " crazylht at gmail dot com
2022-05-07 3:16 ` crazylht at gmail dot com
2022-05-07 3:36 ` crazylht at gmail dot com
2022-05-07 4:04 ` crazylht at gmail dot com
2022-05-07 8:28 ` amonakov at gcc dot gnu.org
2022-06-08 3:24 ` cvs-commit at gcc dot gnu.org
2023-08-05 15:05 ` egallager at gcc dot gnu.org
2023-08-07 1:55 ` crazylht at gmail dot com [this message]
2023-08-12 13:50 ` egallager at gcc dot gnu.org
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