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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/108191] Add support to usage of *intrin.h without
 -mavx512f -mavx512cd
Date: Wed, 21 Dec 2022 08:05:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108191

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to =E7=BD=97=E5=8B=87=E5=88=9A(Yonggang Luo) from comment #2)
> (In reply to Jakub Jelinek from comment #1)
> > You are lying to the compiler, don't.  In GCC you can #include <x86intr=
in.h>
> > with SSE2 only and later in say __attribute__((target ("avx512cd")))
> > function use avx512f/avx512cd intrinsics, no need to do the what you sh=
ow
> > above.
>=20
> Can you be more specific, show me the code, thanks:)

#include <x86intrin.h>

int __attribute__((target("avx512f"))) foo(float f)
{
  __m128 m =3D _mm_set_ss(f);
  return _mm_cvtss_i32(m);
}

results in (with just SSE2):

foo:
.LFB6614:
        .cfi_startproc
        vcvtss2sil      %xmm0, %eax
        ret=