[Bug math/16361] [i386/x86_64] x86 / x86_64 expl / exp10l missing underflows

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

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7540cfc5a8c39eca9ba7b631dd30b35f6530f54d

commit 7540cfc5a8c39eca9ba7b631dd30b35f6530f54d
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Sun Jun 21 17:48:04 2015 +0000

    Fix x86 / x86_64 expl, exp10l missing underflows (bug 16361).

    Similar to various other bugs in this area, 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.  This patch fixes this by
    forcing the exception in the case of tiny results.

    Tested for x86_64 and x86.

        [BZ #16361]
        * sysdeps/i386/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object.
        [!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for
        tiny results.
        * sysdeps/x86_64/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object.
        [!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for
        tiny results.
        * math/auto-libm-test-in: Add more tests of exp and exp10.  Do not
        mark underflow exceptions as possibly missing for bug 16361.
        * math/auto-libm-test-out: Regenerated.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                   |   13 ++
 NEWS                        |   28 +++---
 math/auto-libm-test-in      |    5 +-
 math/auto-libm-test-out     |  260 ++++++++++++++++++++++++++++++++++++++----
 sysdeps/i386/fpu/e_expl.S   |   16 +++-
 sysdeps/x86_64/fpu/e_expl.S |   15 +++-
 6 files changed, 294 insertions(+), 43 deletions(-)

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