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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/94587] Intrinsics optimization bug with -O2
 -march=skylake-avx512
Date: Tue, 14 Apr 2020 20:44:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94587

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Patrick J. LoPresti from comment #5)
> I did not use -ffp-contract=3Dfast nor -funsafe-math-optimizations nor
> -ffast-math. Yet the statements were contracted. So the documentation has=
 a
> bug.

Not exactly because the defualt for -std=3Dc11 is different from -std=3Dgnu=
11
(which is the default, or is the default -std=3Dgnu17 well it depends on the
compiler version).

Plus:
https://gcc.gnu.org/onlinedocs/gcc-9.3.0/gcc/Optimize-Options.html#index-ff=
p-contract=