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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/60237] isnan fails with -ffast-math
Date: Mon, 17 Feb 2014 17:28:00 -0000 [thread overview]
Message-ID: <bug-60237-4-0sFDLgjDNs@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-60237-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60237
--- Comment #7 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to N Schaeffer from comment #6)
> Is there somewhere a rationale for not making isnan() find NaN's with
> -ffinite-math-only ?
finite-math-only is basically a promise that isinf and isnan always return
false...
I have inline library functions that do: if (isnan(x)) ...
When compiled with -ffinite-math-only, I want this eliminated as dead code,
that's the reason I made the function inline in the first place.
Another way to cheat:
int myisnan(double)__asm__("isnan");
prev parent reply other threads:[~2014-02-17 17:28 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-17 10:41 [Bug c++/60237] New: " nathanael.schaeffer at gmail dot com
2014-02-17 10:53 ` [Bug c++/60237] " jakub at gcc dot gnu.org
2014-02-17 11:16 ` nathanael.schaeffer at gmail dot com
2014-02-17 11:26 ` glisse at gcc dot gnu.org
2014-02-17 11:38 ` nathanael.schaeffer at gmail dot com
2014-02-17 12:46 ` rguenth at gcc dot gnu.org
2014-02-17 16:16 ` nathanael.schaeffer at gmail dot com
2014-02-17 17:28 ` glisse at gcc dot gnu.org [this message]
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