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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/106769] New: PPCLE: vec_extract(vector unsigned int)
 unnecessary rldicl after mfvsrwz
Date: Mon, 29 Aug 2022 06:57:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106769

            Bug ID: 106769
           Summary: PPCLE: vec_extract(vector unsigned int) unnecessary
                    rldicl after mfvsrwz
           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>

unsigned int extr(vector unsigned int v)
{
   return vec_extract(v, 2);
}

Generates:

_Z4extrDv4_j:
.LFB1:
        .cfi_startproc
        mfvsrwz 3,34
        rldicl 3,3,0,32
        blr
        .long 0
        .byte 0,9,0,0,0,0,0,0
        .cfi_endproc


The rldicl is not necessary as mfvsrwz already wiped out the upper 32 bits =
of
the register.=