[Bug math/16354] New: cosh spurious underflows

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16354

            Bug ID: 16354
           Summary: cosh spurious underflows
           Product: glibc
           Version: 2.19
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org

On x86_64, for long double, cosh of subnormals produces spurious underflow
exceptions:

Failure: cosh (0x2p-16384): Exception "Underflow" set

It looks likely that other versions of cosh have the same bug, arising from use
of expm1, except for it being covered up by bug 16353 meaning some expm1
versions fail to raise the exception when they should.

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