[Bug math/15359] New: Inaccurate cos for IBM long double

["schwab at linux-m68k dot org" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15359

             Bug #: 15359
           Summary: Inaccurate cos for IBM long double
           Product: glibc
           Version: 2.18
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: unassigned@sourceware.org
        ReportedBy: schwab@linux-m68k.org
    Classification: Unclassified
              Host: powerpc*-*-*


Failure: Test: cos (pi/2) == 1.082856673921913968223746169860580e-32
Result:
 is:          1.08285667392191396822e-32   0x1.c1cd129024e088a67cc7p-107
 should be:   1.08285667392191396822e-32   0x1.c1cd129024e088a67cc7p-107
 difference:  5.71253355584909492648e-62   0x1.78000000000000000000p-204
 ulp       :  376.0000
 max.ulp   :  0.0000
Maximal error of `cos'
 is      : 376 ulp
 accepted: 1 ulp
Failure: Test: sincos (pi/2, &sin_res, &cos_res) puts
1.082856673921913968223746169860580e-32 in cos_res
Result:
 is:          1.08285667392191396822e-32   0x1.c1cd129024e088a67cc7p-107
 should be:   1.08285667392191396822e-32   0x1.c1cd129024e088a67cc7p-107
 difference:  5.71253355584909492648e-62   0x1.78000000000000000000p-204
 ulp       :  376.0000
 max.ulp   :  0.0000
Maximal error of `sincos'
 is      : 376 ulp
 accepted: 1 ulp

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