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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/29256] [11/12/13/14 regression] loop performance
 regression
Date: Mon, 17 Jul 2023 08:29:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D29256

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #76 from Richard Biener <rguenth at gcc dot gnu.org> ---
x86_64 has

  <bb 3> [local count: 536870800]:
  # ivtmp.13_3 =3D PHI <ivtmp.13_9(3), 0(2)>
  vect__1.6_12 =3D MEM <vector(2) double> [(double *)&a + ivtmp.13_3 * 1];
  MEM <vector(2) double> [(double *)&c + ivtmp.13_3 * 1] =3D vect__1.6_12;
  ivtmp.13_9 =3D ivtmp.13_3 + 16;
  if (ivtmp.13_9 !=3D 16000000)

and

.L2:
        movapd  a(%rax), %xmm0
        addq    $16, %rax
        movaps  %xmm0, c-16(%rax)
        cmpq    $16000000, %rax
        jne     .L2

which I think is optimal.  With -fPIC we get

.L2:
        movapd  (%rax,%rdx), %xmm0
        addq    $16, %rax
        movaps  %xmm0, -16(%rax,%rcx)
        cmpq    $16000000, %rax
        jne     .L2

let's close this.=