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* [Bug math/12588] New: fmaf gives incorrect results on x86-64
@ 2011-03-16 1:53 nwhitehe at mailinator dot com
2011-03-16 8:08 ` [Bug math/12588] " jakub at redhat dot com
2014-06-27 13:40 ` fweimer at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: nwhitehe at mailinator dot com @ 2011-03-16 1:53 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=12588
Summary: fmaf gives incorrect results on x86-64
Product: glibc
Version: 2.11
Status: NEW
Severity: normal
Priority: P2
Component: math
AssignedTo: aj@suse.de
ReportedBy: nwhitehe@mailinator.com
Created attachment 5313
--> http://sourceware.org/bugzilla/attachment.cgi?id=5313
simple fmaf() test case
The fmaf() function appears to return incorrect results for some inputs. A
small test case shows that the result of the operation is not computed as if in
infinite precision and then rounded once as the specification requires.
The test case is attached. It computes fmaf(-0x1.6a0a06p-1, 0x1.6a0a06p-1,
0x1.00002ep-1). On my x86-64 Ubuntu 10.04 system I get a result of 0x1p-24.
The correct result is 0x1.51c3eep-25.
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* [Bug math/12588] fmaf gives incorrect results on x86-64
2011-03-16 1:53 [Bug math/12588] New: fmaf gives incorrect results on x86-64 nwhitehe at mailinator dot com
@ 2011-03-16 8:08 ` jakub at redhat dot com
2014-06-27 13:40 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: jakub at redhat dot com @ 2011-03-16 8:08 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=12588
Jakub Jelinek <jakub at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |jakub at redhat dot com
Resolution| |FIXED
--- Comment #1 from Jakub Jelinek <jakub at redhat dot com> 2011-03-16 08:08:47 UTC ---
Your glibc is too old, fma{f,,l} has been rewritten for glibc 2.13.
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* [Bug math/12588] fmaf gives incorrect results on x86-64
2011-03-16 1:53 [Bug math/12588] New: fmaf gives incorrect results on x86-64 nwhitehe at mailinator dot com
2011-03-16 8:08 ` [Bug math/12588] " jakub at redhat dot com
@ 2014-06-27 13:40 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fweimer at redhat dot com @ 2014-06-27 13:40 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=12588
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2011-03-16 1:53 [Bug math/12588] New: fmaf gives incorrect results on x86-64 nwhitehe at mailinator dot com
2011-03-16 8:08 ` [Bug math/12588] " jakub at redhat dot com
2014-06-27 13:40 ` fweimer at redhat dot com
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