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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/102930] equal values appear to be different due to
 missing correct rounding in libc
Date: Mon, 25 Oct 2021 13:57:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102930

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think there is nothing that can be done about this, and something like th=
is
has been there since forever.  While perhaps some double routines in glibc =
used
to be at some point correctly roundded, many others (e.g. float or long dou=
ble)
never were, there is always a chance you get different results from compile
time folding vs. runtime evaluation.=