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* [Bug math/15680] New: IBM long double inaccuracy
@ 2013-06-26 14:39 amodra at gmail dot com
2013-07-12 14:59 ` [Bug math/15680] " amodra at gmail dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: amodra at gmail dot com @ 2013-06-26 14:39 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15680
Bug ID: 15680
Summary: IBM long double inaccuracy
Product: glibc
Version: 2.18
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: amodra at gmail dot com
IBM long double values are printed inaccurately in base 10 floating point
formats when
a) the exponent of the long double approaches the lower end of its range, ie.
the low double is denormal, or,
b) the difference in exponents between the high and low double is greater than
53, or,
c) the difference in exponents is 53, the high and low doubles differ in sign,
and the high double is 0x1.0pnnn.
These user visible errors are all the result of bugs in
__mpn_extract_long_double, and similar bugs exist in related functions.
(c) is PR5268.
(b) is due to shift count exceeds width of type undefined behaviour.
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* [Bug math/15680] IBM long double inaccuracy
2013-06-26 14:39 [Bug math/15680] New: IBM long double inaccuracy amodra at gmail dot com
@ 2013-07-12 14:59 ` amodra at gmail dot com
2013-10-05 2:59 ` amodra at gmail dot com
2014-06-13 9:47 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: amodra at gmail dot com @ 2013-07-12 14:59 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15680
Alan Modra <amodra at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at sourceware dot org |amodra at gmail dot com
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* [Bug math/15680] IBM long double inaccuracy
2013-06-26 14:39 [Bug math/15680] New: IBM long double inaccuracy amodra at gmail dot com
2013-07-12 14:59 ` [Bug math/15680] " amodra at gmail dot com
@ 2013-10-05 2:59 ` amodra at gmail dot com
2014-06-13 9:47 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: amodra at gmail dot com @ 2013-10-05 2:59 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=15680
Alan Modra <amodra at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
URL| |http://sourceware.org/ml/li
| |bc-alpha/2013-06/msg00919.h
| |tml
Resolution|--- |FIXED
Target Milestone|--- |2.19
--- Comment #1 from Alan Modra <amodra at gmail dot com> ---
Fixed
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* [Bug math/15680] IBM long double inaccuracy
2013-06-26 14:39 [Bug math/15680] New: IBM long double inaccuracy amodra at gmail dot com
2013-07-12 14:59 ` [Bug math/15680] " amodra at gmail dot com
2013-10-05 2:59 ` amodra at gmail dot com
@ 2014-06-13 9:47 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 9:47 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=15680
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2013-06-26 14:39 [Bug math/15680] New: IBM long double inaccuracy amodra at gmail dot com
2013-07-12 14:59 ` [Bug math/15680] " amodra at gmail dot com
2013-10-05 2:59 ` amodra at gmail dot com
2014-06-13 9:47 ` fweimer at redhat dot com
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