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* [Bug math/15419] New: PowerPC: spurious overflow for hypotf
@ 2013-04-30 14:25 azanella at linux dot vnet.ibm.com
  2013-05-07 14:16 ` [Bug math/15419] " azanella at linux dot vnet.ibm.com
  2014-06-13 18:09 ` fweimer at redhat dot com
  0 siblings, 2 replies; 3+ messages in thread
From: azanella at linux dot vnet.ibm.com @ 2013-04-30 14:25 UTC (permalink / raw)
  To: glibc-bugs

http://sourceware.org/bugzilla/show_bug.cgi?id=15419

             Bug #: 15419
           Summary: PowerPC: spurious overflow for hypotf
           Product: glibc
           Version: 2.18
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: unassigned@sourceware.org
        ReportedBy: azanella@linux.vnet.ibm.com
    Classification: Unclassified


The hypotf implementation for PowerPC (sysdeps/powerpc/fpu/e_hypotf.c)
generates
spurious overflow exception for subnormal arguments. This is due it checks
if arg1/arg2 > 2^30 (arg1 > arg2) by using a FP division.

Since the double version of ieee sqrt function will be used to compute final
value, there is not need to argument reduction in such case. A possible fix
would be just to clean up the test and call ieee sqrt directly.

I will send a patch to libc-alpha with a fix.

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^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2014-06-13 18:09 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-04-30 14:25 [Bug math/15419] New: PowerPC: spurious overflow for hypotf azanella at linux dot vnet.ibm.com
2013-05-07 14:16 ` [Bug math/15419] " azanella at linux dot vnet.ibm.com
2014-06-13 18:09 ` fweimer at redhat dot com

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