[Bug math/16361] New: x86 / x86_64 expl / exp10l missing underflows

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16361

            Bug ID: 16361
           Summary: x86 / x86_64 expl / exp10l missing 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

The x86 and x86_64 implementations of expl / exp10l can fail to produce
underflow exceptions when the unscaled result has trailing 0 bits so the
scaling down to subnormal precision is exact.  An example at least with a patch
I'm testing for bug 16356 is exp10l (-4932) in round-to-zero mode (the precise
cases may depend on the x87 processor implementation).

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