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* [Bug math/376] New: fdim(+inf, +inf) yields NaN instead of 0.0
@ 2004-09-09 6:46 rth at gcc dot gnu dot org
2004-09-26 10:16 ` [Bug math/376] " drepper at redhat dot com
0 siblings, 1 reply; 2+ messages in thread
From: rth at gcc dot gnu dot org @ 2004-09-09 6:46 UTC (permalink / raw)
To: glibc-bugs
C99 7.12.12.1 says the result is
x - y if x > y
+0 if x <= y
This says to me that fdim(+inf, +inf) = 0.0, not NaN as currently reported.
Comparisons between infinities are strictly defined, even though subtracting
them yields NaN.
Except for the out-of-line routines that use fpclassify (why?) it seems as
if we just need to change the condition on the ?: from < to <=.
--
Summary: fdim(+inf, +inf) yields NaN instead of 0.0
Product: glibc
Version: unspecified
Status: NEW
Severity: minor
Priority: P2
Component: math
AssignedTo: aj at suse dot de
ReportedBy: rth at gcc dot gnu dot org
CC: glibc-bugs at sources dot redhat dot com
http://sources.redhat.com/bugzilla/show_bug.cgi?id=376
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* [Bug math/376] fdim(+inf, +inf) yields NaN instead of 0.0
2004-09-09 6:46 [Bug math/376] New: fdim(+inf, +inf) yields NaN instead of 0.0 rth at gcc dot gnu dot org
@ 2004-09-26 10:16 ` drepper at redhat dot com
0 siblings, 0 replies; 2+ messages in thread
From: drepper at redhat dot com @ 2004-09-26 10:16 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From drepper at redhat dot com 2004-09-26 10:16 -------
I haven't tested all archs, but this should be fixed now.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://sources.redhat.com/bugzilla/show_bug.cgi?id=376
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2004-09-09 6:46 [Bug math/376] New: fdim(+inf, +inf) yields NaN instead of 0.0 rth at gcc dot gnu dot org
2004-09-26 10:16 ` [Bug math/376] " drepper at redhat dot com
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