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From: "mathieu.malaterre at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/106187] armhf: Miscompilation at O2 level (O0 / O1 are
 working)
Date: Tue, 05 Jul 2022 08:00:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106187

--- Comment #8 from Mathieu Malaterre <mathieu.malaterre at gmail dot com> =
---
(In reply to Jan Wassenberg from comment #7)
> The easiest way to reduce the amount of code in the binary is to comment =
out
> from mul_test.cc all the HWY_EXPORT_AND_TEST_P except the one with
> TestAllMulEven.
>=20
> The actual miscompilation is probably happening within ops/emu128-inl.h.
>=20
> You can further reduce instantiations by replacing
> ForFloatTypes(ForPartialVectors<TestMulAdd>());
> with
> TestMulAdd()(float(), FixedTag<float, 4>());
>=20
> That gets us down to a fairly minimal single TU (mul_test.cc).

Bingo !

Program received signal SIGABRT, Aborted.
0xb6cafe86 in ?? () from /lib/arm-linux-gnueabihf/libc.so.6
(gdb) bt
#0  0xb6cafe86 in ?? () from /lib/arm-linux-gnueabihf/libc.so.6
#1  0xb6cbf0e4 in raise () from /lib/arm-linux-gnueabihf/libc.so.6
#2  0xb6cafa16 in abort () from /lib/arm-linux-gnueabihf/libc.so.6
#3  0x00416a2c in hwy::Abort (file=3Dfile@entry=3D0x43acf8
"/home/malat/highway/hwy/tests/mul_test.cc", line=3Dline@entry=3D308,
format=3D0x43b6ec "%s, %sx%llu lane %llu mismatch: expected '%s', got '%s'.=
\n")
    at /home/malat/highway/hwy/targets.cc:322
#4  0x00416cbc in hwy::detail::PrintMismatchAndAbort (info=3D...,
expected_ptr=3Dexpected_ptr@entry=3D0x0, actual_ptr=3D0x467580,
actual_ptr@entry=3D0x43acf8, target_name=3Dtarget_name@entry=3D0x43ad24 "Em=
u128",
    filename=3D0x43acf8 "/home/malat/highway/hwy/tests/mul_test.cc",
filename@entry=3D0xb6ff3010 "", line=3Dline@entry=3D308, lane=3D0,
num_lanes=3Dnum_lanes@entry=3D4) at /home/malat/highway/hwy/tests/test_util=
.cc:90
#5  0x00416d54 in hwy::detail::AssertArrayEqual (info=3D...,
expected_void=3Dexpected_void@entry=3D0x467500,
actual_void=3Dactual_void@entry=3D0x467580, N=3DN@entry=3D4, target_name=3D=
0x43ad24
"Emu128",
    filename=3D0x43acf8 "/home/malat/highway/hwy/tests/mul_test.cc", line=
=3D308) at
/home/malat/highway/hwy/tests/test_util.cc:113
#6  0x004108ae in hwy::N_EMU128::AssertVecEqual<hwy::N_EMU128::Simd<float, =
4u,
0>, float, hwy::N_EMU128::Vec128<float, 4u> > (line=3D308, filename=3D0x43a=
cf8
"/home/malat/highway/hwy/tests/mul_test.cc",
    actual=3D..., expected=3D0x467500, d=3D...) at
/home/malat/highway/hwy/tests/test_util-inl.h:51
#7  hwy::N_EMU128::TestMulAdd::operator()<float, hwy::N_EMU128::Simd<float,=
 4u,
0> > (d=3D..., this=3D<optimized out>) at
/home/malat/highway/hwy/tests/mul_test.cc:308
#8  0x0043a114 in void
testing::internal::HandleExceptionsInMethodIfSupported<testing::Test,
void>(testing::Test*, void (testing::Test::*)(), char const*) ()=