On Wed, May 30, 2018 at 12:58:49PM +0000, Segher Boessenkool wrote:
> This patch changes the (C++) mangling of the 128-bit float types:
>
> __ieee128 becomes u9__ieee128
> __ibm128 becomes u8__ieee128
__ibm128 becomes u8__ibm128
of course.
> __float128 is not a type anymore
> IEEE long double becomes u9__ieee128
> IBM long double stays g
>
> This is a necessary ABI break. It will need backporting to 8, too.
>
> Bootstrapped and tested on powerpc64-linux {-m32,-m64} (Power7) and
> on powerpc64le-linux (Power9). Also tested manually; testsuite
> patches will follow soon.
>
> I'll commit this later today if nothing comes up.
>
>
> Segher
>
>
> 2018-05-30 Segher Boessenkool <seg...@kernel.crashing.org>
>
> * config/rs6000/rs6000.c (rs6000_mangle_type): Change the mangling of
> the 128-bit floating point types.
>
> ---
> gcc/config/rs6000/rs6000.c | 27 +++++++++++----------------
> 1 file changed, 11 insertions(+), 16 deletions(-)
>
> diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
> index fab8ee3..f140816 100644
> --- a/gcc/config/rs6000/rs6000.c
> +++ b/gcc/config/rs6000/rs6000.c
> @@ -32001,21 +32001,6 @@ rs6000_mangle_type (const_tree type)
> if (type == bool_int_type_node) return "U6__booli";
> if (type == bool_long_long_type_node) return "U6__boolx";
>
> - /* Use a unique name for __float128 rather than trying to use "e" or "g".
> Use
> - "g" for IBM extended double, no matter whether it is long double (using
> - -mabi=ibmlongdouble) or the distinct __ibm128 type. */
> - if (TARGET_FLOAT128_TYPE)
> - {
> - if (type == ieee128_float_type_node)
> - return "U10__float128";
> -
> - if (type == ibm128_float_type_node)
> - return "u8__ibm128";
> -
> - if (TARGET_LONG_DOUBLE_128 && type == long_double_type_node)
> - return (TARGET_IEEEQUAD) ? "U10__float128" : "g";
> - }
> -
> /* Mangle IBM extended float long double as `g' (__float128) on
> powerpc*-linux where long-double-64 previously was the default. */
> if (TYPE_MAIN_VARIANT (type) == long_double_type_node
> @@ -32024,7 +32009,17 @@ rs6000_mangle_type (const_tree type)
> && !TARGET_IEEEQUAD)
> return "g";
>
> - /* For all other types, use normal C++ mangling. */
> + if (TARGET_FLOAT128_TYPE)
> + {
> + if (type == ieee128_float_type_node
> + || (type == long_double_type_node && TARGET_LONG_DOUBLE_128))
> + return "u9__ieee128";
> +
> + if (type == ibm128_float_type_node)
> + return "u8__ibm128";
> + }
> +
> + /* For all other types, use the default mangling. */
> return NULL;
> }
>
> --
> 1.8.3.1
