[NDS32] Since argument pointer must be 8-byte alignment...

[NDS32] Since argument pointer must be 8-byte alignment, our first parameter may
        require 4-byte offset if pushed varargs is not 8-byte aligned.

	* config/nds32/nds32.h (FIRST_PARM_OFFSET): Set proper location
	according to the value of crtl->args.pretend_args_size.

From-SVN: r214863

gcc/ChangeLog

 2014-09-03  Chung-Ju Wu  <jasonwucj@gmail.com>
 
+	* config/nds32/nds32.h (FIRST_PARM_OFFSET): Set proper location
+	according to the value of crtl->args.pretend_args_size.
+
+2014-09-03  Chung-Ju Wu  <jasonwucj@gmail.com>
+
 	* config/nds32/nds32.c (nds32_compute_stack_frame): Prepare necessary
 	varargs information.
 

gcc/config/nds32/nds32.h

@@ -671,7 +671,8 @@ enum reg_class
 
 #define STACK_POINTER_OFFSET 0
 
-#define FIRST_PARM_OFFSET(fundecl) 0
+#define FIRST_PARM_OFFSET(fundecl) \
+  (NDS32_DOUBLE_WORD_ALIGN_P (crtl->args.pretend_args_size) ? 0 : 4)
 
 #define RETURN_ADDR_RTX(count, frameaddr) \
   nds32_return_addr_rtx (count, frameaddr)