[Bug math/16390] New: Soft-float ldbl-128ibm atan2l incorrect signs of zero

[Bug math/16390] New: Soft-float ldbl-128ibm atan2l incorrect signs of zero

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16390

            Bug ID: 16390
           Summary: Soft-float ldbl-128ibm atan2l incorrect signs of zero
           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

On powerpc-nofpu, testing atan2l gives errors such as:

Failure: Test: atan2 (-0x4p-1024, 0xf.ffffffffffff8p+1020)
Result:
 is:          0.00000000000000000000e+00   0x0.00000000000000000000p+0
 should be:  -0.00000000000000000000e+00  -0x0.00000000000000000000p+0
 difference:  0.00000000000000000000e+00   0x0.00000000000000000000p+0
 ulp       :  0.0000
 max.ulp   :  0.0000

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[Bug math/16390] Soft-float ldbl-128ibm atan2l incorrect signs of zero

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=16390

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, master has been updated
       via  22562bb222a91e0ecc416b19accd98e10c0d26be (commit)
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=22562bb222a91e0ecc416b19accd98e10c0d26be

commit 22562bb222a91e0ecc416b19accd98e10c0d26be
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri Jan 3 20:56:18 2014 +0000

    Fix soft-float ldbl-128ibm atan2l signs of zero results (bug 16390).

    This patch fixes bug 16390, incorrect signs of zero results from
    ldbl-128ibm atan2l, soft-float only.  The problem is a longstanding
    GCC bug with fabsl not being correct for signed zero for soft float,
    and the fix is using -fno-builtin-fabsl as a workaround, as already
    done for various other source files.  Tested powerpc-nofpu.

        * sysdeps/powerpc/nofpu/Makefile [$(subdir) = math]
        (CFLAGS-e_atan2l.c): Use -fno-builtin-fabsl.

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

Summary of changes:
 ChangeLog                      |    6 ++++++
 NEWS                           |    2 +-
 sysdeps/powerpc/nofpu/Makefile |    1 +
 3 files changed, 8 insertions(+), 1 deletions(-)

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[Bug math/16390] Soft-float ldbl-128ibm atan2l incorrect signs of zero

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16390

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/16390] Soft-float ldbl-128ibm atan2l incorrect signs of zero

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16390

Florian Weimer <fweimer at redhat dot com> changed:

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

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