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From: "nathanael.schaeffer at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/60237] New: isnan fails with -ffast-math Date: Mon, 17 Feb 2014 10:41:00 -0000 [thread overview] Message-ID: <bug-60237-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60237 Bug ID: 60237 Summary: isnan fails with -ffast-math Product: gcc Version: 4.8.1 Status: UNCONFIRMED Severity: major Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: nathanael.schaeffer at gmail dot com With -ffast-math, isnan should return true if passed a NaN value. Otherwise, how is isnan different than (x!=x) ? isnan worked as expected with gcc 4.7, but does not with 4.8.1 and 4.8.2 How can I check if x is a NaN in a portable way (not presuming any compilation option) ?
next reply other threads:[~2014-02-17 10:41 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-02-17 10:41 nathanael.schaeffer at gmail dot com [this message] 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
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