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From: "aoliva at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/95401] [10 Regression] GCC produces incorrect
 instruction with -O3 for AVX2 since r10-2257-g868363d4f52df19d
Date: Thu, 11 Mar 2021 07:00:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95401

--- Comment #9 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
It is definitely a problem in the dg infrastructure that compile mode doesn=
't
work with additional sources, but fixing that seems quite involved, more th=
an I
can tackle right now.  I've tried to duplicate the problem with a single te=
st
source file, with the compiler commit mentioned in the initial report, but
failed, and it wasn't just because of the type inconsistency between var_14
across the current units.  I suppose the alignment miscomputation, that cau=
sed
an aligned vector store insn to be incorrectly used, doesn't come up when t=
he
alignment is known, and much stricter than what can be assumed for an exter=
nal
symbol.  Oh well...=