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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/96793] __builtin_floor produces wrong result when
 rounding direction is FE_DOWNWARD
Date: Fri, 28 Aug 2020 12:20:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96793

--- Comment #14 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #13)
>         if (HONOR_SIGNED_ZEROS (mode))
>           x2 =3D copysign (x2, x);

Hmm, I misread the comment, sorry. We already do that, for both floor and c=
eil.
But we don't use a true copysign, we use ix86_sse_copysign_to_positive which
won't be able to change the sign from - to +. Just changing it to a true
copysign (one extra and or andn) should be enough then?=