[Bug math/17022] [i386/x86_64] logl (-LDBL_MAX) spurious overflow with -lieee in FE_DOWNWARD mode

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

https://sourceware.org/bugzilla/show_bug.cgi?id=17022

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, master has been updated
       via  4ba7a00fe3779e6ffafad6d47305b3491cdac33e (commit)
      from  b3a9f56ba59c3d8eadd3135a1c25c37a63151450 (commit)

Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.

- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4ba7a00fe3779e6ffafad6d47305b3491cdac33e

commit 4ba7a00fe3779e6ffafad6d47305b3491cdac33e
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jun 18 12:32:01 2014 +0000

    Fix __ieee754_logl (-LDBL_MAX) in FE_DOWNWARD mode (bug 17022).

    This patch fixes __ieee754_logl (-LDBL_MAX) on x86_64 and x86 not to
    subtract 1 from its argument and so cause spurious overflow in
    FE_DOWNWARD mode.  (For any argument strictly less than -1, it doesn't
    matter whether or not 1 is subtracted before computing log1p, as long
    as the result doesn't overflow to -Inf.)

    Tested x86_64 and x86.  (This particular case lacks test coverage,
    since the testsuite doesn't cover -lieee, but it will be covered by
    tests after the following patch to test pow in all rounding modes,
    which was the context in which this bug was found.)

        [BZ #17022]
        * sysdeps/i386/fpu/e_logl.S (__ieee754_logl): Do not subtract 1
        from arguments -2 or below.
        * sysdeps/i386/i686/fpu/e_logl.S (__ieee754_logl): Likewise.
        * sysdeps/x86_64/fpu/e_logl.S (__ieee754_logl): Likewise.

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

Summary of changes:
 ChangeLog                      |    8 ++++++++
 NEWS                           |    4 ++--
 sysdeps/i386/fpu/e_logl.S      |    5 ++++-
 sysdeps/i386/i686/fpu/e_logl.S |    5 ++++-
 sysdeps/x86_64/fpu/e_logl.S    |    5 ++++-
 5 files changed, 22 insertions(+), 5 deletions(-)

-- 
You are receiving this mail because:
You are on the CC list for the bug.