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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug fortran/105924] false floating point exception when evaluating exponential function Date: Sat, 11 Jun 2022 16:22:53 +0000 [thread overview] Message-ID: <bug-105924-4-tQuklcYTmj@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-105924-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105924 kargl at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED CC| |kargl at gcc dot gnu.org Resolution|--- |INVALID --- Comment #1 from kargl at gcc dot gnu.org --- Why do you thing that you should not get an exception? e = -400 e*e = 160000 -e*e = -160000 exp(-e*e) = exp(-160000) <-- This is going to underflow to zero. You specifically asked gfortran to signal an exception if underflow occurs with the -ffpe-trap=underflow option. The underflow threshold occurs at x = -745 for exp(x).
next prev parent reply other threads:[~2022-06-11 16:22 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-06-11 7:20 [Bug fortran/105924] New: " yelinhui at hotmail dot com 2022-06-11 16:22 ` kargl at gcc dot gnu.org [this message] 2022-08-03 8:41 ` [Bug fortran/105924] " yelinhui at hotmail dot com
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