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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/100866] New: PPC: Inefficient code for vec_revb(vector
 unsigned short) < P9
Date: Wed, 02 Jun 2021 07:14:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100866

            Bug ID: 100866
           Summary: PPC: Inefficient code for vec_revb(vector unsigned
                    short) < P9
           Product: gcc
           Version: 8.3.1
            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: ---

Input:

vector unsigned short revb(vector unsigned short a)
{
   return vec_revb(a);
}

creates:

_Z4revbDv8_t:
.LFB1:
        .cfi_startproc
.LCF1:
0:      addis 2,12,.TOC.-.LCF1@ha
        addi 2,2,.TOC.-.LCF1@l
        .localentry     _Z4revbDv8_t,.-_Z4revbDv8_t
        addis 9,2,.LC1@toc@ha
        addi 9,9,.LC1@toc@l
        lvx 0,0,9
        xxlnor 32,32,32
        vperm 2,2,2,0
        blr


Optimal code sequence:
vector unsigned short revb_pwr7(vector unsigned short a)
{
   return vec_rl(a, vec_splats((unsigned short)8));
}

_Z9revb_pwr7Dv8_t:
.LFB2:
        .cfi_startproc
        .localentry     _Z9revb_pwr7Dv8_t,1
        vspltish 0,8
        vrlh 2,2,0
        blr=