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From: "malat at debian dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/106322] i386: Wrong code at O2 level (O0 / O1 are working)
Date: Sat, 16 Jul 2022 10:07:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106322

--- Comment #6 from Mathieu Malaterre <malat at debian dot org> ---
Using `-fno-strict-aliasing` causes the same symptoms:

/usr/bin/g++-12 -DHWY_STATIC_DEFINE
-I"/home/malat/highway-0.17.1~git20220711.f0a396a" -O2 -fno-strict-aliasing
-fPIE -fvisibility=3Dhidden -fvisibility-inlines-hidden
-Wno-builtin-macro-redefined -D__DATE__=3D\"redacted\"
-D__TIMESTAMP__=3D\"redacted\" -D__TIME__=3D\"redacted\" -fmerge-all-consta=
nts
-Wall -Wextra -Wconversion -Wsign-conversion -Wvla -Wnon-virtual-dtor
-fmath-errno -fno-exceptions -DHWY_IS_TEST=3D1 -DGTEST_HAS_PTHREAD=3D1 -MD =
-MT
CMakeFiles/mul_test.dir/hwy/tests/mul_test.cc.o -MF
CMakeFiles/mul_test.dir/hwy/tests/mul_test.cc.o.d -o
CMakeFiles/mul_test.dir/hwy/tests/mul_test.cc.o -c
"/home/malat/highway-0.17.1~git20220711.f0a396a/hwy/tests/mul_test.cc"
[...]
Running main() from ./googletest/src/gtest_main.cc
Note: Google Test filter =3D HwyMulTestGroup/HwyMulTest.TestAllMulHigh/Emu1=
28
[=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.TestAllMulHigh/Emu128


i16x8 expect [0+ ->]:
  0x3FFF,0x0FFF,0x03FF,0x00FF,0x003F,0x000F,0x0003,
i16x8 actual [0+ ->]:
  0xBFFF,0x0FFF,0xE400,0x00FF,0xF840,0x000F,0xFE04,
Abort at
/home/malat/highway-0.17.1~git20220711.f0a396a/hwy/tests/mul_test.cc:131:
Emu128, i16x8 lane 0 mismatch: expected '0x3FFF', got '0xBFFF'.=