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From: "guihaoc at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/110429] New: Redundant vector extract instruction on P9
Date: Tue, 27 Jun 2023 09:12:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110429

            Bug ID: 110429
           Summary: Redundant vector extract instruction on P9
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: guihaoc at gcc dot gnu.org
  Target Milestone: ---

//test.c
#include <altivec.h>
void extract_int_2 (int *p, vector int a) { *p =3D vec_extract (a, 2); }

On P9 LE, it generates
        xxextractuw 34,34,4
        stxsiwx 34,0,3

The xxextractuw is unnecessary as the extracted int is just at word[1].=