c4x.h (EXPAND_BUILTIN_VA_ARG): New.

        * c4x.h (EXPAND_BUILTIN_VA_ARG): New.
        * c4x.c (c4x_va_arg): New.

From-SVN: r28277

gcc/ChangeLog

+Mon Jul 26 16:43:26 1999  Richard Henderson  <rth@cygnus.com>
+
+	* c4x.h (EXPAND_BUILTIN_VA_ARG): New.
+	* c4x.c (c4x_va_arg): New.
+
 Mon Jul 26 12:30:09 1999  Jason Merrill  <jason@yorick.cygnus.com>
 
 	* cpplib.c (cpp_get_token): Don't return a CPP_POP if the buffer

gcc/config/c4x/c4x.c

@@ -572,6 +572,21 @@ c4x_function_arg (cum, mode, type, named)
     return NULL_RTX;
 }
 
+/* C[34]x arguments grow in weird ways (downwards) that the standard
+   varargs stuff can't handle. */
+
+rtx
+c4x_va_arg (valist, type)
+     tree valist, type;
+{
+  tree t;
+
+  t = build (PREDECREMENT_EXPR, TREE_TYPE (valist), valist,
+	     build_int_2 (int_size_in_bytes (type), 0));
+  TREE_SIDE_EFFECTS (t) = 1;
+
+  return expand_expr (t, NULL_RTX, Pmode, EXPAND_NORMAL);
+}
 
 static int
 c4x_isr_reg_used_p (regno)

gcc/config/c4x/c4x.h

@@ -1157,6 +1157,10 @@ extern struct rtx_def *c4x_function_arg();
 #define DEFAULT_PCC_STRUCT_RETURN	0
 #define STRUCT_VALUE_REGNUM		AR0_REGNO	/* AR0 */
 
+/* Varargs handling.  */
+
+#define EXPAND_BUILTIN_VA_ARG(valist, type) \
+  c4x_va_arg (valist, type)
 
 /* Function Entry and Exit  */