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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/103932] x86: strange unoptimized code generated
 (multiple negations of _mm_testz_si128 result)
Date: Thu, 06 Jan 2022 21:23:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103932

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
   Last reconfirmed|                            |2022-01-06
     Ever confirmed|0                           |1
           Severity|normal                      |enhancement
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The gimple level is decent:
  _7 =3D __builtin_ia32_ptestz128 (_4, _4);
  _1 =3D _7 =3D=3D 0;
  bit_5 =3D (const u64) _1;

Though _7 is already 0 or 1. The problem is the target does not say the ran=
ge
of __builtin_ia32_ptestz128 is 0 or 1.=