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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107748] [13 Regression] Isn't _mm_cvtsbh_ss incorrect?
Date: Fri, 18 Nov 2022 11:31:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107748

--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
float
_mm_cvtsbh_ss (__bf16 __A)
{
  union{ float sf; __bf16 bf[2];} __tmp;
  __tmp.sf =3D 0.0f;
  __tmp.bf[1] =3D __A;
  return __tmp.sf;
}

Looks like gcc can optimize it to

_mm_cvtsbh_ss(bool _Accum):
        movd    %xmm0, %eax
        sall    $16, %eax
        movd    %eax, %xmm0
        ret=