pa.h (DEFAULT_PCC_STRUCT_RETURN): Define as zero.

	* pa.h (DEFAULT_PCC_STRUCT_RETURN): Define as zero.
	(RETURN_IN_MEMORY): Only large structs (>8 bytes) and addressable
	structs should be returned in memory.
	ci -u calls.c

From-SVN: r8573

gcc/config/pa/pa.h

@@ -349,7 +349,7 @@ do {								\
    Reg 23-26	= Temporary/Parameter Registers
    Reg 27	= Global Data Pointer (hp)
    Reg 28	= Temporary/???/Return Value register
-   Reg 29	= Temporary/Static Chain/Return Value register
+   Reg 29	= Temporary/Static Chain/Return Value register #2
    Reg 30	= stack pointer
    Reg 31	= Temporary/Millicode Return Pointer (hp)
 
@@ -530,8 +530,9 @@ do {								\
 #define INIT_EXPANDERS hppa_save_pic_table_rtx = 0;
 
 /* SOM ABI says that objects larger than 64 bits are returned in memory.  */
+#define DEFAULT_PCC_STRUCT_RETURN 0
 #define RETURN_IN_MEMORY(TYPE)	\
-  (TYPE_MODE (TYPE) == BLKmode || int_size_in_bytes (TYPE) > 8)
+  (int_size_in_bytes (TYPE) > 8 || TREE_ADDRESSABLE (TYPE))
 
 /* Register in which address to store a structure value
    is passed to a function.  */