[Bug math/21686] tgmath.h handling of __int128

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https://sourceware.org/bugzilla/show_bug.cgi?id=21686

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=42df8d5921d9ce28f44694ae943efb432b5e9aa7

commit 42df8d5921d9ce28f44694ae943efb432b5e9aa7
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Aug 2 20:16:05 2017 +0000

    Fix tgmath.h for __int128 (bug 21686).

    When a tgmath.h macro is passed a double argument and an argument of
    type __int128, it generates a call to a long double function (although
    the result still gets converted to type double).  __int128 is similar
    enough to integer types that it should be handled consistently like
    them, so always like double for these macros rather than sometimes
    like double and sometimes like long double.  This patch fixes the
    logic accordingly and makes gen-tgmath-tests.py generate tests for
    __int128.

    Tested for x86_64 and x86.

        [BZ #21686]
        * math/tgmath.h (__TGMATH_BINARY_REAL_ONLY): Add arguments before
        comparing size with that of double.
        (__TGMATH_BINARY_REAL_STD_ONLY): Likewise.
        (__TGMATH_BINARY_REAL_RET_ONLY): Likewise.
        (__TGMATH_TERNARY_FIRST_SECOND_REAL_ONLY): Likewise.
        (__TGMATH_TERNARY_REAL_ONLY): Likewise.
        (__TGMATH_BINARY_REAL_IMAG): Likewise.
        * math/gen-tgmath-tests.py (Type.init_types): Create __int128 and
        unsigned __int128 types.

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

Summary of changes:
 ChangeLog                |   13 +++++++++++++
 math/gen-tgmath-tests.py |    4 ++++
 math/tgmath.h            |   20 +++++++-------------
 3 files changed, 24 insertions(+), 13 deletions(-)

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