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[Bug math/16353] expm1 missing/spurious underflows
- From: "zimmerma+gcc at loria dot fr" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 07 Feb 2014 07:54:12 +0000
- Subject: [Bug math/16353] expm1 missing/spurious underflows
- Auto-submitted: auto-generated
- References: <bug-16353-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=16353
Paul Zimmermann <zimmerma+gcc at loria dot fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|expm1 missing underflows |expm1 missing/spurious
| |underflows
--- Comment #4 from Paul Zimmermann <zimmerma+gcc at loria dot fr> ---
this example (in extended precision) gives a spurious underflow:
Testing function expm1 for exponent 0 [seed=8344].
rounding mode MPFR_RNDN:
wrong underflow flag for x=4.0000000000000028@-4096
library gives 4.0000000000000028@-4096
mpfr gives 4.0000000000000028@-4096
underflow: mpfr 0, library 16
Note the glibc result is *above* the smallest subnormal 0x1p-16382, thus no
exception should be raised.
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