Making __builtin_signbit type-generic

[FX]

> Please look at builtins.def, grep for TYPEGENERIC.

Sure, I can define it as TYPEGENERIC in the builtins.def, like this:

Index: builtins.def
===================================================================
--- builtins.def	(revision 225434)
+++ builtins.def	(working copy)
@@ -489,7 +489,7 @@ DEF_C99_BUILTIN        (BUILT_IN_SCALBLN
 DEF_C99_BUILTIN        (BUILT_IN_SCALBN, "scalbn", BT_FN_DOUBLE_DOUBLE_INT, ATTR_MATHFN_FPROUNDING_ERRNO)
 DEF_C99_BUILTIN        (BUILT_IN_SCALBNF, "scalbnf", BT_FN_FLOAT_FLOAT_INT, ATTR_MATHFN_FPROUNDING_ERRNO)
 DEF_C99_BUILTIN        (BUILT_IN_SCALBNL, "scalbnl", BT_FN_LONGDOUBLE_LONGDOUBLE_INT, ATTR_MATHFN_FPROUNDING_ERRNO)
-DEF_EXT_LIB_BUILTIN    (BUILT_IN_SIGNBIT, "signbit", BT_FN_INT_DOUBLE, ATTR_CONST_NOTHROW_LEAF_LIST)
+DEF_EXT_LIB_BUILTIN    (BUILT_IN_SIGNBIT, "signbit", BT_FN_INT_VAR, ATTR_CONST_NOTHROW_TYPEGENERIC_LEAF)
 DEF_EXT_LIB_BUILTIN    (BUILT_IN_SIGNBITF, "signbitf", BT_FN_INT_FLOAT, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_EXT_LIB_BUILTIN    (BUILT_IN_SIGNBITL, "signbitl", BT_FN_INT_LONGDOUBLE, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_EXT_LIB_BUILTIN    (BUILT_IN_SIGNBITD32, "signbitd32", BT_FN_INT_DFLOAT32, ATTR_CONST_NOTHROW_LEAF_LIST)


But does that mean the middle-end will handle it completely?

FX