[Bug math/16384] New: ldbl-128ibm acoshl inaccurate

[Bug math/16384] New: ldbl-128ibm acoshl inaccurate

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16384

            Bug ID: 16384
           Summary: ldbl-128ibm acoshl 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 acoshl is inaccurate for some inputs, e.g.:

Test "acosh (0x1.ap+0)":
ildouble: 2244803385201568
ldouble: 2244803385201568

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[Bug math/16384] ldbl-128ibm acoshl inaccurate

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=16384

--- 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
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The branch, master has been updated
       via  396e3ecf3e8f0f05bd7eeaf995a3f0c2327a6cd6 (commit)
      from  6c8dbf00f536d78b1937b5af6f57be47fd376344 (commit)

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=396e3ecf3e8f0f05bd7eeaf995a3f0c2327a6cd6

commit 396e3ecf3e8f0f05bd7eeaf995a3f0c2327a6cd6
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Jan 2 16:33:06 2014 +0000

    Fix ldbl-128ibm acoshl inaccuracy (bug 16384).

    This patch fixes bug 16384, ldbl-128ibm acoshl inaccuracy, which
    showed up while attempting to regenerate ulps for powerpc-nofpu for
    2.19.  There were two separate problems, use of __log1p instead of
    __log1pl and an insufficiently accurate constant value for log 2
    (which this patch replaces by use of M_LN2l), each of which could
    cause substantial inaccuracy in affected cases.

    Tested for powerpc-nofpu.

        * sysdeps/ieee754/ldbl-128ibm/e_acoshl.c (ln2): Initialize with
        M_LN2l.
        (__ieee754_acoshl): Use __log1pl not __log1p.

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

Summary of changes:
 ChangeLog                              |    7 +++++++
 NEWS                                   |    2 +-
 sysdeps/ieee754/ldbl-128ibm/e_acoshl.c |    4 ++--
 3 files changed, 10 insertions(+), 3 deletions(-)

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[Bug math/16384] ldbl-128ibm acoshl inaccurate

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16384

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.

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[Bug math/16384] ldbl-128ibm acoshl inaccurate

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16384

Florian Weimer <fweimer at redhat dot com> changed:

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

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