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

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

[jsm28 at gcc dot gnu.org]

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

            Bug ID: 17022
           Summary: [i386/x86_64] logl (-LDBL_MAX) spurious overflow with
                    -lieee in FE_DOWNWARD mode
           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
              Host: i?86-*-* x86_64-*-*

On x86 and x86_64, logl (-LDBL_MAX) raises a spurious overflow exception with
-lieee in FE_DOWNWARD mode (i.e., __ieee754_logl raises such an exception,
which the wrappers hide for direct logl calls except when -lieee is used).

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

[fweimer at redhat dot com]

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

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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

[jsm28 at gcc dot gnu.org]

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

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 2.20.

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

[cvs-commit at gcc dot gnu.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
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- 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(-)

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