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[Bug math/15268] exp (-7.4444006192138124e+02) missing underflow
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 03 Dec 2013 00:36:08 +0000
- Subject: [Bug math/15268] exp (-7.4444006192138124e+02) missing underflow
- Auto-submitted: auto-generated
- References: <bug-15268-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=15268
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Default SET_RESTORE_ROUND |exp
|implementation hold |(-7.4444006192138124e+02)
|exceptions |missing underflow
--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
I don't see that there's a bug in SET_RESTORE_ROUND here; libc_feresetround
calls feupdateenv which should cause any exceptions that were raised after
SET_RESTORE_ROUND to generate corresponding traps. It looks like the exp call
only generates exact underflow but not inexact, even though this is a case of
an inexact result; that's a bug in exp (and applies on x86_64 as well).
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