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[Bug math/14471] Inaccurate y0f function on x86_32 and x86_64
- From: "zimmerma+gcc at loria dot fr" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 04 Feb 2014 14:06:06 +0000
- Subject: [Bug math/14471] Inaccurate y0f function on x86_32 and x86_64
- Auto-submitted: auto-generated
- References: <bug-14471-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=14471
Paul Zimmermann <zimmerma+gcc at loria dot fr> changed:
What |Removed |Added
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CC| |zimmerma+gcc at loria dot fr
--- Comment #3 from Paul Zimmermann <zimmerma+gcc at loria dot fr> ---
another example:
Testing function y0 for exponent 0 [seed=4519].
rounding mode MPFR_RNDZ:
wrong underflow flag for x=e.4c1760@-1
library gives 0
mpfr gives 3.274468@-7
underflow: mpfr 0, library 0
The correct result given by mpfr (I hope) is far away from the subnormal
range (1.17472840344135e-8 vs 1.17549435082229e-38) thus the error is huge,
and moreover the glibc result 0 is inconsistent with the underflow flag.
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