[Bug math/18966] New: [i386] exp10 missing underflows

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

https://sourceware.org/bugzilla/show_bug.cgi?id=18966

            Bug ID: 18966
           Summary: [i386] exp10 missing underflows
           Product: glibc
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---
              Host: i?86-*-*

On i386, the double version of exp10 can miss underflow exceptions if the
result is in the subnormal range for double but the last 11 bits of the 64-bit
extended-precision mantissa happen to be zero.  E.g. (examples producing this
may vary depending on x86 implementations):

Failure: exp10 (-0x1.33ad17p+8): Exception "Underflow" not set
Failure: exp10_downward (-0x1.33aa03p+8): Exception "Underflow" not set
Failure: exp10_towardzero (-0x1.33ad17p+8): Exception "Underflow" not set
Failure: exp10_upward (-0x1.33afcap+8): Exception "Underflow" not set

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