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From: "xry111 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/114140] different results for std::fmin/std::fmax and quadmath fminq/fmaxq if one argument=signaling_NaN
Date: Wed, 28 Feb 2024 11:36:37 +0000 [thread overview]
Message-ID: <bug-114140-4-YNNJyV6PwZ@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-114140-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114140
Xi Ruoyao <xry111 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |documentation
CC| |xry111 at gcc dot gnu.org
--- Comment #16 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #15)
> It's the old argument on whether isnan(NaN) should return true or false with
> -ffinite-math-only. With what we currently do "constant folding" sNaN into
> NaN would be correct with -fno-signalling-nans, likewise constant folding
> Inf into 42.0 is "correct" for -ffinite-math-only.
>
> You are basically invoking undefined beavior when introducing sNaN into a
> program without using -fsignalling-nans.
Then we should make it more clear in invoke.texi. Currently the doc is
implying the worst consequence using sNaN with -fno-signalling-nans is
"changing the number of raised exceptions."
next prev parent reply other threads:[~2024-02-28 11:36 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-27 21:09 [Bug libquadmath/114140] New: quadmath fminq/fmaxq with signaling_NaN not work g.peterhoff@t-online.de
2024-02-27 22:14 ` [Bug libquadmath/114140] " jakub at gcc dot gnu.org
2024-02-27 22:20 ` jsm28 at gcc dot gnu.org
2024-02-27 22:36 ` [Bug middle-end/114140] " pinskia at gcc dot gnu.org
2024-02-27 22:40 ` [Bug middle-end/114140] fmin/fmax " pinskia at gcc dot gnu.org
2024-02-27 22:41 ` jakub at gcc dot gnu.org
2024-02-27 22:48 ` pinskia at gcc dot gnu.org
2024-02-28 0:59 ` [Bug middle-end/114140] different results for std::fmin/std::fmax and quadmath fminq/fmaxq if one argument=signaling_NaN g.peterhoff@t-online.de
2024-02-28 1:02 ` [Bug libquadmath/114140] " pinskia at gcc dot gnu.org
2024-02-28 1:04 ` pinskia at gcc dot gnu.org
2024-02-28 1:06 ` pinskia at gcc dot gnu.org
2024-02-28 1:07 ` pinskia at gcc dot gnu.org
2024-02-28 1:09 ` pinskia at gcc dot gnu.org
2024-02-28 1:55 ` g.peterhoff@t-online.de
2024-02-28 2:00 ` pinskia at gcc dot gnu.org
2024-02-28 8:12 ` rguenth at gcc dot gnu.org
2024-02-28 11:36 ` xry111 at gcc dot gnu.org [this message]
2024-02-28 12:35 ` rguenth at gcc dot gnu.org
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