i386.h (MS_AGGREGATE_RETURN): New define.

	* config/i386/i386.h (MS_AGGREGATE_RETURN): New define.
	* config/i386/cygwin.h (MS_AGGREGATE_RETURN): Override default
	definition.
	* config/i386/i386.h (ix86_return_in_memory): Return aggregate
	types of up to 8 bytes via registers if MS_AGGREGATE_RETURN.

From-SVN: r62547

gcc/ChangeLog

+2003-03-07  Danny Smith  <dannysmith@users.sourceforge.net>
+
+	* config/i386/i386.h (MS_AGGREGATE_RETURN): New define.
+	* config/i386/cygwin.h (MS_AGGREGATE_RETURN): Override default
+	definition.
+	* config/i386/i386.h (ix86_return_in_memory): Return aggregate
+	types of up to 8 bytes via registers if MS_AGGREGATE_RETURN.
+
 Fri Feb  7 22:22:40 CET 2003  Jan Hubicka  <jh@suse.cz>
 
 	* i386.md (movdi_rex64_1): Fix mmx<->int move opcode.

gcc/config/i386/cygwin.h

@@ -410,6 +410,11 @@ extern int i386_pe_dllimport_name_p PARAMS ((const char *));
 #undef DEFAULT_PCC_STRUCT_RETURN
 #define DEFAULT_PCC_STRUCT_RETURN 0
 
+/* MSVC returns aggregate types of up to 8 bytes via registers.
+   See i386.c:ix86_return_in_memory.  */
+#undef MS_AGGREGATE_RETURN
+#define MS_AGGREGATE_RETURN 1
+
 /* No data type wants to be aligned rounder than this.  */
 #undef	BIGGEST_ALIGNMENT
 #define BIGGEST_ALIGNMENT 128

gcc/config/i386/i386.c

@@ -2608,10 +2608,16 @@ ix86_return_in_memory (type)
     }
   else
     {
-      if (TYPE_MODE (type) == BLKmode
-	  || (VECTOR_MODE_P (TYPE_MODE (type))
+      if (TYPE_MODE (type) == BLKmode)
+	return 1;
+      else if (MS_AGGREGATE_RETURN
+	       && AGGREGATE_TYPE_P (type)
+	       && int_size_in_bytes(type) <= 8)
+	return 0;
+      else if ((VECTOR_MODE_P (TYPE_MODE (type))
 	        && int_size_in_bytes (type) == 8)
-	  || (int_size_in_bytes (type) > 12 && TYPE_MODE (type) != TImode
+	       || (int_size_in_bytes (type) > 12
+		   && TYPE_MODE (type) != TImode
 		   && TYPE_MODE (type) != TFmode
 		   && !VECTOR_MODE_P (TYPE_MODE (type))))
 	return 1;

gcc/config/i386/i386.h

@@ -1208,6 +1208,9 @@ do {									\
 #define RETURN_IN_MEMORY(TYPE) \
   ix86_return_in_memory (TYPE)
 
+/* This is overriden by <cygwin.h>.  */
+#define MS_AGGREGATE_RETURN 0
+
 
 /* Define the classes of registers for register constraints in the
    machine description.  Also define ranges of constants.