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From: "jens.seifert at de dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/106770] New: PPCLE: Unnecessary xxpermdi before mfvsrd
Date: Mon, 29 Aug 2022 07:52:26 +0000
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X-Bugzilla-Version: 11.2.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106770

            Bug ID: 106770
           Summary: PPCLE: Unnecessary xxpermdi before mfvsrd
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jens.seifert at de dot ibm.com
  Target Milestone: ---

#include <altivec.h>

int cmp2(double a, double b)
{
    vector double va =3D vec_promote(a, 1);
    vector double vb =3D vec_promote(b, 1);
    vector long long vlt =3D (vector long long)vec_cmplt(va, vb);
    vector long long vgt =3D (vector long long)vec_cmplt(vb, va);
    vector signed long long vr =3D vec_sub(vlt, vgt);

    return vec_extract(vr, 1);
}

Generates:

_Z4cmp2dd:
.LFB1:
        .cfi_startproc
        xxpermdi 1,1,1,0
        xxpermdi 2,2,2,0
        xvcmpgtdp 33,2,1
        xvcmpgtdp 32,1,2
        vsubudm 0,1,0
        xxpermdi 0,32,32,3
        mfvsrd 3,0
        extsw 3,3
        blr

The unnecessary xxpermdi for vec_promote are already reported in another
bugzilla case.

mfvsrd can access all 64 vector registers directly and xxpermdi is not
required.
mfvsrd 3,32 expected instead xxpermdi 0,32,32,3 + mfvsrd 3,0=