This patch changes the (C++) mangling of the 128-bit float types.
IBM long double ("double-double") is mangled as "g", as before, and
IEEE 128-bit long double is mangled as "u9__ieee128".
Bootstrapped and tested on powerpc64-linux {-m32,-m64} (Power7) and
on powerpc64le-linux (Power9). Also tested manually; testsuite
patches will follow soon.
Committing to trunk.
Segher
2018-06-01 Segher Boessenkool <seg...@kernel.crashing.org>
* config/rs6000/rs6000.c (rs6000_mangle_type): Change the mangling of
the 128-bit floating point types. Fix function comment.
---
gcc/config/rs6000/rs6000.c | 31 +++++++------------------------
1 file changed, 7 insertions(+), 24 deletions(-)
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index fab8ee3..a755491 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -31983,8 +31983,9 @@ rs6000_handle_altivec_attribute (tree *node,
return NULL_TREE;
}
-/* AltiVec defines four built-in scalar types that serve as vector
- elements; we must teach the compiler how to mangle them. */
+/* AltiVec defines five built-in scalar types that serve as vector
+ elements; we must teach the compiler how to mangle them. The 128-bit
+ floating point mangling is target-specific as well. */
static const char *
rs6000_mangle_type (const_tree type)
@@ -32001,30 +32002,12 @@ 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
- && TARGET_ELF
- && TARGET_LONG_DOUBLE_128
- && !TARGET_IEEEQUAD)
+ if (SCALAR_FLOAT_TYPE_P (type) && FLOAT128_IBM_P (TYPE_MODE (type)))
return "g";
+ if (SCALAR_FLOAT_TYPE_P (type) && FLOAT128_IEEE_P (TYPE_MODE (type)))
+ return "u9__ieee128";
- /* For all other types, use normal C++ mangling. */
+ /* For all other types, use the default mangling. */
return NULL;
}
--
1.8.3.1
