Basic ABI changes for passing structs by value in 64-bit Darwin.

        * config/rs6000/rs6000.c (rs6000_darwin64_abi): New flag.
        (rs6000_override_options): Set it for 64-bit Darwin.
        (rs6000_parse_abi_options): Add testing options to change it.
        (rs6000_return_in_memory): Test whether the type is one
        that can be passed in registers.
        (darwin64_function_arg_advance): New.
        (function_arg_advance): Call it, plus add recursion depth
        argument and test when counting off arguments.
        (rs6000_darwin64_function_arg): New.
        (function_arg): Call it.
        (setup_incoming_varargs): Add argument to function_arg_advance.
        (rs6000_darwin64_function_value): New.
        (rs6000_function_value): Call it.
        * config/rs6000/rs6000.h (FUNCTION_ARG_ADVANCE): Pass depth arg.
        * config/rs6000/rs6000-protos.h: Update decl of
        function_arg_advance.

From-SVN: r90629

gcc/ChangeLog

+2004-11-14  Stan Shebs  <shebs@apple.com>
+
+	Basic ABI changes for passing structs by value in 64-bit Darwin.
+	* config/rs6000/rs6000.c (rs6000_darwin64_abi): New flag.
+	(rs6000_override_options): Set it for 64-bit Darwin.
+	(rs6000_parse_abi_options): Add testing options to change it.
+	(rs6000_return_in_memory): Test whether the type is one
+	that can be passed in registers.
+	(darwin64_function_arg_advance): New.
+	(function_arg_advance): Call it, plus add recursion depth
+	argument and test when counting off arguments.
+	(rs6000_darwin64_function_arg): New.
+	(function_arg): Call it.
+	(setup_incoming_varargs): Add argument to function_arg_advance.
+	(rs6000_darwin64_function_value): New.
+	(rs6000_function_value): Call it.
+	* config/rs6000/rs6000.h (FUNCTION_ARG_ADVANCE): Pass depth arg.
+	* config/rs6000/rs6000-protos.h: Update decl of
+	function_arg_advance.
+
 2004-11-14  Andrew Pinski  <pinskia@physics.uc.edu>
 
 	PR c/17279

gcc/config/rs6000/rs6000-protos.h

@@ -156,7 +156,7 @@ extern rtx rs6000_machopic_legitimize_pic_address (rtx orig,
 #ifdef TREE_CODE
 extern unsigned int rs6000_special_round_type_align (tree, int, int);
 extern void function_arg_advance (CUMULATIVE_ARGS *, enum machine_mode,
-				  tree, int);
+				  tree, int, int);
 extern int function_arg_boundary (enum machine_mode, tree);
 extern struct rtx_def *function_arg (CUMULATIVE_ARGS *,
 				     enum machine_mode, tree, int);

gcc/config/rs6000/rs6000.h

@@ -1713,7 +1713,7 @@ typedef struct rs6000_args
    (TYPE is null for libcalls where that information may not be available.)  */
 
 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)	\
-  function_arg_advance (&CUM, MODE, TYPE, NAMED)
+  function_arg_advance (&CUM, MODE, TYPE, NAMED, 0)
 
 /* Determine where to put an argument to a function.
    Value is zero to push the argument on the stack,