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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109132] Apple M1 floating point bug when optimizing
Date: Tue, 14 Mar 2023 20:11:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109132

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> ubuntu@ubuntu:~\# ~/upstream-gcc/bin/gcc t.c -O2 -ffp-contract=3Doff
> ubuntu@ubuntu:~\# ./a.out
> 0x1.2eab1ep-2 0x0p+0
> ubuntu@ubuntu:~\# ~/upstream-gcc/bin/gcc t.c -O2
> ubuntu@ubuntu:~\# ./a.out
> 0x1.2eab1ep-2 0x1.1b990cp-29
>=20
>=20
>=20
> NOT a bug. the use of FMA increases precission here ...

Note this was done on aarch64-linux-gnu with a GCC built from 20230310.=