[Bug math/16422] [powerpc] math-float, math-double failing llrint tests with "Exception "Inexact" set" on ppc32

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https://sourceware.org/bugzilla/show_bug.cgi?id=16422

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e8dab9477f33ab7a67405f4e147cbaa1a4bb443b

commit e8dab9477f33ab7a67405f4e147cbaa1a4bb443b
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Oct 13 00:52:54 2015 +0000

    Fix powerpc32 llrint, llrintf bad exceptions (bug 16422).

    The versions of llrint and llrintf for older powerpc32 processors
    convert the results of __rint / __rintf to long long int, resulting in
    spurious exceptions from such casts in certain cases.  This patch
    makes glibc work around the problems with the libgcc conversions when
    the compiler used to build glibc doesn't use the fctidz instruction
    for them.

    Tested for powerpc.

        [BZ #16422]
        * sysdeps/powerpc/powerpc32/fpu/configure.ac (libc_cv_ppc_fctidz):
        New configure test.
        * sysdeps/powerpc/powerpc32/fpu/configure: Regenerated.
        * config.h.in [_LIBC] (HAVE_PPC_FCTIDZ): New macro.
        * sysdeps/powerpc/powerpc32/fpu/s_llrint.c: Include <limits.h>,
        <math_private.h> and <stdint.h>.
        (__llrint): Avoid conversions to long long int where those might
        raise spurious exceptions.
        * sysdeps/powerpc/powerpc32/fpu/s_llrintf.c: Include
        <math_private.h> and <stdint.h>.
        (__llrintf): Avoid conversions to long long int where those might
        raise spurious exceptions.

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

Summary of changes:
 ChangeLog                                  |   16 ++++++++++++++
 NEWS                                       |   20 +++++++++---------
 config.h.in                                |    3 ++
 sysdeps/powerpc/powerpc32/fpu/configure    |   27 ++++++++++++++++++++++++
 sysdeps/powerpc/powerpc32/fpu/configure.ac |   16 ++++++++++++++
 sysdeps/powerpc/powerpc32/fpu/s_llrint.c   |   31 +++++++++++++++++++++++++++-
 sysdeps/powerpc/powerpc32/fpu/s_llrintf.c  |   22 +++++++++++++++++++-
 7 files changed, 123 insertions(+), 12 deletions(-)

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