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From: "mathieu.malaterre at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/106187] New: armhf: Miscompilation with -O2
Date: Mon, 04 Jul 2022 16:23:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106187

            Bug ID: 106187
           Summary: armhf: Miscompilation with -O2
           Product: gcc
           Version: 11.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mathieu.malaterre at gmail dot com
  Target Milestone: ---

I can trigger an assertion in highway unit test suite on armhf when using -=
O2
(does not happen at -O0).

Symptoms:

% tests/mul_test
"--gtest_filter=3DHwyMulTestGroup/HwyMulTest.TestAllMulAdd/Emu128"
"--gtest_also_run_disabled_tests"
Running main() from ./googletest/src/gtest_main.cc
Note: Google Test filter =3D HwyMulTestGroup/HwyMulTest.TestAllMulAdd/Emu128
[=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from HwyMulTestGroup/HwyMulTest
[ RUN      ] HwyMulTestGroup/HwyMulTest.TestAllMulAdd/Emu128


f32x4 expect [0+ ->]:
  5,11,19,29,
f32x4 actual [0+ ->]:
  -9,11,19,29,
Abort at /home/malat/highway/hwy/tests/mul_test.cc:308: Emu128, f32x4 lane 0
mismatch: expected '5', got '-9'.

zsh: abort      tests/mul_test  "--gtest_also_run_disabled_tests"=