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From: "gabravier at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/96654] New: Failure to optimize vectorized conversion to
 `int` with AVX
Date: Mon, 17 Aug 2020 11:57:33 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 11.0
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X-Bugzilla-Severity: normal
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96654

            Bug ID: 96654
           Summary: Failure to optimize vectorized conversion to `int`
                    with AVX
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gabravier at gmail dot com
  Target Milestone: ---

void f(double *src, int *dst)
{
    for (int i =3D 0; i < 4; i ++)
        dst[i] =3D (int)src[i];
}

With -O3 -mavx, LLVM outputs this :

f(double*, int*):
  vcvttpd2dq xmm0, ymmword ptr [rdi]
  vmovupd xmmword ptr [rsi], xmm0
  ret

GCC outputs this :

f(double*, int*):
  push rbp
  vmovupd xmm1, XMMWORD PTR [rdi]
  vinsertf128 ymm0, ymm1, XMMWORD PTR [rdi+16], 0x1
  mov rbp, rsp
  vcvttpd2dq xmm0, ymm0
  vmovdqu XMMWORD PTR [rsi], xmm0
  vzeroupper
  pop rbp
  ret=