[Bug target/86285] We don't mangle __ieee128 correctly using -mlong-double-64 -mabi=ieeelongdouble

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86285

--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Mon Jul  2 21:25:10 2018
New Revision: 262320

URL: https://gcc.gnu.org/viewcvs?rev=262320&root=gcc&view=rev
Log:
rs6000: Set up ieee128_float_type_node correctly (PR86285)

We shouldn't init __ieee128 to be the same as long double if the
latter is not even a 128-bit type.

This also reorders the nearby __ibm128 code so both types use similar
logic.


        Backport from trunk
        2018-06-26  Segher Boessenkool  <segher@kernel.crashing.org>

        PR target/86285
        * config/rs6000/rs6000.c (rs6000_init_builtins): Do not set
        ieee128_float_type_node to long_double_type_node unless
        TARGET_LONG_DOUBLE_128 is set.

Modified:
    branches/gcc-8-branch/gcc/ChangeLog
    branches/gcc-8-branch/gcc/config/rs6000/rs6000.c