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From: "bugreporter66 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109007] New: building for POWER8 leaks into POWER9 ISA
 with g++ 11.3 (cross-compiler on x86_64 host)
Date: Fri, 03 Mar 2023 11:58:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109007

            Bug ID: 109007
           Summary: building for POWER8 leaks into POWER9 ISA with g++
                    11.3 (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 54577
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54577&action=3Dedit
archive with the source code and screenshot to reproduce the issue

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

Building for POWER8 (-mcpu=3Dpower8) creates binary that has illegal instru=
ction
for POWER8 ISA, as confirmed by running the code with QEMU (see screenshot).

The command line for building is the following (change to test directory
first):
make -f core_make_p64.mk build_le -j4

The command line for emulation with QEMU (spits illegal instruction):
qemu-ppc64le -cpu POWER8 core_test.p64f32Lp8

The test case is taken from https://github.com/VectorChief/QuadRay-engine,
where that test fails (master) for POWER8 target on Ubuntu MATE 22.04.2=