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From: "haochen.jiang at intel dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113656] [x86] ICE in simplify_const_unary_operation, at
 simplify-rtx.cc:1954 with new -mavx10.1
Date: Tue, 30 Jan 2024 06:49:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113656

--- Comment #3 from Haochen Jiang <haochen.jiang at intel dot com> ---
(In reply to Haochen Jiang from comment #2)
> Actually it is caused by option -funsafe-math-optimizations but not
> -mavx10.1.
>=20
> Before my commit, while using option:
>=20
> -frounding-math -O3 -mavx512fp16 -mavx512vl -funsafe-math-optimizations
>=20
> It will also report ICE. In GCC13.2, it won't, which means it is introduc=
ed
> in GCC14.
>=20
> You got that bisect result since it is when avx10.1 first introduced.
> -mavx10.1 will enable -mavx512fp16 and -mavx512vl.
>=20
> When we eliminate -funsafe-math-optimizations, it will be ok.
>=20
> Also if we are only using -mavx512vl, everything is ok. Seems like someth=
ing
> got disabled under -mavx512fp16.

What I mean "disabled" here is actually not enabled while using
-funsafe-math-optimizations with -mavx512fp16.

>=20
> Need more bisect with option: -frounding-math -O3 -mavx512fp16 -mavx512vl
> -funsafe-math-optimizations to find out why.=