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Subject: [Bug target/104610] memcmp () == 0 can be optimized better for avx512f
Date: Sun, 27 Feb 2022 19:29:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104610

--- Comment #14 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #13)
> (In reply to Hongtao.liu from comment #8)
> > Created attachment 52495 [details]
> > untested patch.
>=20
> I see these regressions with -m32:
>=20
> FAIL: gcc.dg/lower-subreg-1.c scan-rtl-dump subreg1 "Splitting reg"
> FAIL: gcc.target/i386/iamcu/test_basic_64bit_returning.c execution,  -O0=
=20
> FAIL: gcc.target/i386/iamcu/test_basic_64bit_returning.c execution,  -O1=
=20
> FAIL: gcc.target/i386/iamcu/test_basic_64bit_returning.c execution,  -O2=
=20
> FAIL: gcc.target/i386/iamcu/test_basic_64bit_returning.c execution,  -O3 =
-g=20
> FAIL: gcc.target/i386/iamcu/test_basic_64bit_returning.c execution,  -Os=
=20
> FAIL: gcc.target/i386/iamcu/test_struct_returning.c execution,  -O0=20
> FAIL: gcc.target/i386/iamcu/test_struct_returning.c execution,  -O1=20
> FAIL: gcc.target/i386/iamcu/test_struct_returning.c execution,  -Og -g

-m64 regression:

FAIL: gcc.target/i386/pr82580.c scan-assembler-not \\mmovzb=