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* [Bug target/100711] New: Miss optimization for pandn
@ 2021-05-21  2:22 crazylht at gmail dot com
  2021-05-21  6:42 ` [Bug target/100711] " rguenth at gcc dot gnu.org
                   ` (14 more replies)
  0 siblings, 15 replies; 16+ messages in thread
From: crazylht at gmail dot com @ 2021-05-21  2:22 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100711

            Bug ID: 100711
           Summary: Miss optimization for pandn
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: crazylht at gmail dot com
                CC: hjl.tools at gmail dot com
  Target Milestone: ---
            Target: x86_64-*-* i?86-*-*

cat test.c

typedef int v4si __attribute__((vector_size (16)));
v4si
foo (int a, v4si b)
{
    return (__extension__ (v4si) {~a, ~a, ~a, ~a}) & b;
}

generate

        notl    %edi
        vmovdqa %xmm0, %xmm1
        vpbroadcastd    %edi, %xmm0
        vpand   %xmm1, %xmm0, %xmm0
        ret

it should be better as

        vmovdqa %xmm0, %xmm1
        vpbroadcastd    %edi, %xmm0
        vpandn   %xmm1, %xmm0, %xmm0

^ permalink raw reply	[flat|nested] 16+ messages in thread

end of thread, other threads:[~2023-07-05  7:49 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-21  2:22 [Bug target/100711] New: Miss optimization for pandn crazylht at gmail dot com
2021-05-21  6:42 ` [Bug target/100711] " rguenth at gcc dot gnu.org
2021-05-21 10:36 ` segher at gcc dot gnu.org
2021-05-25  5:40 ` crazylht at gmail dot com
2021-05-25  6:52 ` crazylht at gmail dot com
2021-05-25 10:09 ` segher at gcc dot gnu.org
2021-11-30  8:37 ` cvs-commit at gcc dot gnu.org
2021-11-30  8:46 ` crazylht at gmail dot com
2023-05-24  8:42 ` jbeulich at suse dot com
2023-05-25  6:52 ` crazylht at gmail dot com
2023-05-25  8:36 ` jbeulich at suse dot com
2023-05-25  8:50 ` crazylht at gmail dot com
2023-05-27  9:28 ` cvs-commit at gcc dot gnu.org
2023-07-05  7:49 ` cvs-commit at gcc dot gnu.org
2023-07-05  7:49 ` cvs-commit at gcc dot gnu.org
2023-07-05  7:49 ` cvs-commit at gcc dot gnu.org

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