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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/101471] AVX512 incorrect writemask generated for
 _mm512_fpclass_ps_mask in O0
Date: Tue, 20 Jul 2021 03:14:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101471

Hongtao.liu <crazylht at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |wwwhhhyyy333 at gmail dot =
com

--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
w/ -O0, it's defined as macro

#define _mm512_fpclass_ps_mask(x, c)                                    \
  ((__mmask16) __builtin_ia32_fpclassps512_mask ((__v16sf) (__m512) (x),\
                                                 (int) (c),(__mmask8)-1))

and (__mmask16)-1 should be used

w/ -O2 it's ok

extern __inline __mmask16
__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
_mm512_fpclass_ps_mask (__m512 __A, const int __imm)
{
  return (__mmask16) __builtin_ia32_fpclassps512_mask ((__v16sf) __A,
                                                       __imm,
                                                       (__mmask16) -1);
}=