stmt.c (expand_return): Don't return anything if size is zero.

	* stmt.c (expand_return): Don't return anything if size is zero.
	Delete redundant assignment to BYTES.
	* expr.c (move_block_from_reg): Do nothing if NREGS is zero.

From-SVN: r39156

gcc/ChangeLog

+Sat Jan 20 12:46:57 2001  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
+
+	* stmt.c (expand_return): Don't return anything if size is zero.
+	Delete redundant assignment to BYTES.
+	* expr.c (move_block_from_reg): Do nothing if NREGS is zero.
+
 2001-01-20  Marek Michalkiewicz  <marekm@linux.org.pl>
 
 	* config/avr/avr.h (INIT_TARGET_OPTABS): Remove most of it, was

gcc/expr.c

@@ -1857,6 +1857,9 @@ move_block_from_reg (regno, x, nregs, size)
 #endif
   enum machine_mode mode;
 
+  if (nregs == 0)
+    return;
+
   /* If SIZE is that of a mode no bigger than a word, just use that
      mode's store operation.  */
   if (size <= UNITS_PER_WORD

gcc/stmt.c

@@ -3016,6 +3016,12 @@ expand_return (retval)
       rtx result_val = expand_expr (retval_rhs, NULL_RTX, VOIDmode, 0);
       enum machine_mode tmpmode, result_reg_mode;
 
+      if (bytes == 0)
+	{
+	  expand_null_return ();
+	  return;
+	}
+
       /* Structures whose size is not a multiple of a word are aligned
 	 to the least significant byte (to the right).  On a BYTES_BIG_ENDIAN
 	 machine, this means we must skip the empty high order bytes when
@@ -3063,15 +3069,12 @@ expand_return (retval)
       /* Find the smallest integer mode large enough to hold the
 	 entire structure and use that mode instead of BLKmode
 	 on the USE insn for the return register.   */
-      bytes = int_size_in_bytes (TREE_TYPE (retval_rhs));
       for (tmpmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
 	   tmpmode != VOIDmode;
 	   tmpmode = GET_MODE_WIDER_MODE (tmpmode))
-	{
-	  /* Have we found a large enough mode?  */
-	  if (GET_MODE_SIZE (tmpmode) >= bytes)
-	    break;
-	}
+	/* Have we found a large enough mode?  */
+	if (GET_MODE_SIZE (tmpmode) >= bytes)
+	  break;
 
       /* No suitable mode found.  */
       if (tmpmode == VOIDmode)