[Bug math/19486] S390: Math tests fail with "Exception Inexact set".

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https://sourceware.org/bugzilla/show_bug.cgi?id=19486

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c4d17461e062e730fca4076dd47a2733b3914c51

commit c4d17461e062e730fca4076dd47a2733b3914c51
Author: Stefan Liebler <stli@de.ibm.com>
Date:   Mon Jan 18 12:48:06 2016 +0100

    S/390: Do not raise inexact exception in lrint/lround. [BZ #19486]

    I get some math test-failures on s390 for float/double/ldouble for
    various lrint/lround functions like:
    lrint (0x1p64): Exception "Inexact" set
    lrint (-0x1p64): Exception "Inexact" set
    lround (0x1p64): Exception "Inexact" set
    lround (-0x1p64): Exception "Inexact" set
    ...

    GCC emits "convert to fixed" instructions for casting floating point
    values to integer values. These instructions raise invalid and inexact
    exceptions if the floating point value exceeds the integer type ranges.

    This patch enables the various FIX_DBL_LONG_CONVERT_OVERFLOW macros in
    order to avoid a cast from floating point to integer type and raise the
    invalid exception with feraiseexcept.
    The ldbl-128 rint/round functions are now using the same logic.

    ChangeLog:

        [BZ #19486]
        * sysdeps/s390/fix-fp-int-convert-overflow.h: New File.
        * sysdeps/generic/fix-fp-int-convert-overflow.h
        (FIX_LDBL_LONG_CONVERT_OVERFLOW,
        FIX_LDBL_LLONG_CONVERT_OVERFLOW): New define.
        * sysdeps/arm/fix-fp-int-convert-overflow.h: Likewise.
        * sysdeps/mips/mips32/fpu/fix-fp-int-convert-overflow.h:
        Likewise.
        * sysdeps/ieee754/ldbl-128/s_lrintl.c (__lrintl):
        Avoid conversions to long int where inexact exceptions
        could be raised.
        * sysdeps/ieee754/ldbl-128/s_lroundl.c (__lroundl):
        Likewise.
        * sysdeps/ieee754/ldbl-128/s_llrintl.c (__llrintl):
        Avoid conversions to long long int where inexact exceptions
        could be raised.
        * sysdeps/ieee754/ldbl-128/s_llroundl.c (__llroundl):
        Likewise.

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

Summary of changes:
 ChangeLog                                          |   21 ++++++++++++++++++++
 sysdeps/arm/fix-fp-int-convert-overflow.h          |    2 +
 sysdeps/generic/fix-fp-int-convert-overflow.h      |    2 +
 sysdeps/ieee754/ldbl-128/s_llrintl.c               |    7 ++++++
 sysdeps/ieee754/ldbl-128/s_llroundl.c              |   11 ++++++++-
 sysdeps/ieee754/ldbl-128/s_lrintl.c                |    7 ++++++
 sysdeps/ieee754/ldbl-128/s_lroundl.c               |   11 ++++++++-
 .../mips/mips32/fpu/fix-fp-int-convert-overflow.h  |    2 +
 .../{arm => s390}/fix-fp-int-convert-overflow.h    |   17 ++++++++-------
 9 files changed, 68 insertions(+), 12 deletions(-)
 copy sysdeps/{arm => s390}/fix-fp-int-convert-overflow.h (64%)

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