[Bug math/18619] [ldbl-128] expm1l wrong sign of underflowing zero results

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

https://sourceware.org/bugzilla/show_bug.cgi?id=18619

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a04bb3306a9f9f17e5c588c903a438f1182ecd1a

commit a04bb3306a9f9f17e5c588c903a438f1182ecd1a
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jul 1 22:27:49 2015 +0000

    Fix ldbl-128 expm1l (-min_subnorm) result sign (bug 18619).

    In the ldbl-128 implementation of expm1l, when expm1l's result should
    underflow to 0 (argument minus the least subnormal, in some rounding
    modes), it can be a zero of the wrong sign.  This patch fixes this in
    the same way previously used for the x86 / x86_64 versions.

    Tested for mips64.

        [BZ #18619]
        * sysdeps/ieee754/ldbl-128/s_expm1l.c (__expm1l): Force underflow
        and return argument in case of subnormal argument.

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

Summary of changes:
 ChangeLog                           |    6 ++++++
 NEWS                                |    2 +-
 sysdeps/ieee754/ldbl-128/s_expm1l.c |   15 ++++++++++++---
 3 files changed, 19 insertions(+), 4 deletions(-)

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