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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	[thread overview]
Message-ID: <bug-96654-4@http.gcc.gnu.org/bugzilla/> (raw)

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96654

            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 = 0; i < 4; i ++)
        dst[i] = (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

             reply	other threads:[~2020-08-17 11:57 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-17 11:57 gabravier at gmail dot com [this message]
2020-08-17 19:04 ` [Bug tree-optimization/96654] " ubizjak at gmail dot com
2020-08-22 16:32 ` glisse at gcc dot gnu.org
2020-08-25 10:40 ` rguenth at gcc dot gnu.org

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