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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107546] [10/11/12/13 Regression] simd, redundant pcmpeqb
 and pxor
Date: Mon, 07 Nov 2022 07:14:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107546

--- Comment #4 from Hongtao.liu <crazylht at gmail dot com> ---

> even. Notice the < vs <=3D there.
> I suspect the <=3D expansion part of the x86_64 backend needs to be fixed=
 up
> to produce better code.

Hmm, we do have a extra pcmpeq to negate the result.

--------------cut from ix86_expand_int_vec_cmp---------------
  rtx cmp =3D ix86_expand_int_sse_cmp (operands[0], code, operands[2],
                                     operands[3], NULL, NULL, &negate);

  if (!cmp)
    return false;

  if (negate)
    cmp =3D ix86_expand_int_sse_cmp (operands[0], EQ, cmp,
                                   CONST0_RTX (GET_MODE (cmp)),
                                   NULL, NULL, &negate);
---------------cut end-------------------------------=