[Bug math/16386] New: ldbl-128ibm logl inaccurate

[Bug math/16386] New: ldbl-128ibm logl inaccurate

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16386

            Bug ID: 16386
           Summary: ldbl-128ibm logl inaccurate
           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

ldbl-128ibm logl is inaccurate for some (subnormal, at least) inputs, e.g.:

Test "log (0x4p-1076)":
ildouble: 2537856265320914891174599603578
ldouble: 2537856265320914891174599603578

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

[Bug math/16386] ldbl-128ibm logl inaccurate

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=16386

--- 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  819e5d50dd4d10dc359037eba74c70e74cb42739 (commit)
      from  90b6a1e55fdbb3e6a3132742c26eb19666ad9e33 (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=819e5d50dd4d10dc359037eba74c70e74cb42739

commit 819e5d50dd4d10dc359037eba74c70e74cb42739
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Jan 2 16:35:46 2014 +0000

    Fix ldbl-128ibm logl inaccuracy (bug 16386).

    This patch fixes bug 16386, ldbl-128ibm logl inaccuracy (with
    consequent inaccuracy for lgammal) for arguments where the high double
    is subnormal, which showed up while attempting to regenerate ulps for
    powerpc-nofpu for 2.19.  The problem here is logic failing to allow
    for subnormals when calculating the exponent of the argument.  Tested
    for powerpc-nofpu.

        * sysdeps/ieee754/ldbl-128ibm/e_logl.c (__ieee754_logl): Adjust
        numbers with subnormal high part when calculating exponent.

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

Summary of changes:
 ChangeLog                            |    4 ++++
 NEWS                                 |    3 ++-
 sysdeps/ieee754/ldbl-128ibm/e_logl.c |    8 ++++++++
 3 files changed, 14 insertions(+), 1 deletions(-)

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

[Bug math/16386] ldbl-128ibm logl inaccurate

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16386

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 2.19.

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

[Bug math/16386] ldbl-128ibm logl inaccurate

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16386

Florian Weimer <fweimer at redhat dot com> changed:

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

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