[Bug target/105359] _Float128 expanders and builtins disabled on ppc targets with 64-bit long double

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105359

--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Alexandre Oliva <aoliva@gcc.gnu.org>:

https://gcc.gnu.org/g:dbdddc92a3b955fce71af47755c226132559eda2

commit r15-786-gdbdddc92a3b955fce71af47755c226132559eda2
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Thu May 23 03:20:19 2024 -0300

    [testsuite] xfail pr79004 on longdouble64; drop long_double_64bit

    Some of the asm opcodes expected by pr79004 depend on
    -mlong-double-128 to be output.  E.g., without this flag, the
    conditions of patterns @extenddf<mode>2 and extendsf<mode>2 do not
    hold, and so GCC resorts to libcalls instead of even trying
    rs6000_expand_float128_convert.

    Perhaps the conditions are too strict, and they could enable the use
    of conversion insns involving __ieee128/_Float128 even with 64-bit
    long doubles.

    For now, xfail the opcodes that are not available on longdouble64.

    While at that, drop long_double_64bit, since it's broken and sort of
    redundant.


    for  gcc/testsuite/ChangeLog

            PR target/105359
            * gcc.target/powerpc/pr79004.c: Xfail opcodes not available on
            longdouble64.
            * lib/target-supports.exp
            (check_effective_target_long_double_64bit): Drop.
            (add_options_for_long_double_64bit): Likewise.