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From: "bugreporter66 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109004] New: wrong code for -O2 (any above -O0) with g++
 11.3 for POWER9 (cross-compiler on x86_64 host)
Date: Fri, 03 Mar 2023 09:59:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109004

            Bug ID: 109004
           Summary: wrong code for -O2 (any above -O0) with g++ 11.3 for
                    POWER9 (cross-compiler on x86_64 host)
           Product: gcc
           Version: 11.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bugreporter66 at gmail dot com
  Target Milestone: ---

Created attachment 54574
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54574&action=3Dedit
archive with all the necessary source and output files

The code sample is attached with all the necessary output files. It's a
regression from g++ 9.x series, where it worked properly.

The line that fails the test is a ternary operator working on two memory
floating point operands: farr[n] < farr[m] ? farr[n] : farr[m];

Two potential workarounds for this are turning optimizations off (-O0) or
re-targeting to POWER8 instead (-O2 -mcpu=3Dpower8).

The test case is taken from https://github.com/VectorChief/UniSIMD-assemble=
r,
where that test fails (v1.1.0c) for POWER9 target on Ubuntu MATE 22.04.2=