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From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/15405] New: csin, csinh, ccos, ccosh missing underflow exceptions
Date: Fri, 26 Apr 2013 15:26:00 -0000
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: math
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X-Bugzilla-Who: jsm28 at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P2
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http://sourceware.org/bugzilla/show_bug.cgi?id=15405

             Bug #: 15405
           Summary: csin, csinh, ccos, ccosh missing underflow exceptions
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jsm28@gcc.gnu.org
    Classification: Unclassified


Similar to bug 14478 (fixed) for cexp, the functions csin, csinh, ccos, ccosh
are missing underflow exceptions when the final result underflows but the
multiplication generating it is exact although the mathematical result of the
function is not exactly representable.  Examples showing this on x86_64 are:

csin (0x1p-1074 + 0x1p-1022i)
csinh (0x1p-1022 + 0x1p-1074i)
ccos (0x1p-954 + 0x1p-120i)
ccosh (0x1p-120 + 0x1p-954i)

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