h8300.c (compute_mov_length): Adjust for the new optimization.

	* config/h8300/h8300.c (compute_mov_length): Adjust for the
	new optimization.
	* config/h8300/h8300.md (*movsi_h8300): Optimize the load of
	an SImode constant whose upper and lower are the same.

From-SVN: r68475

gcc/ChangeLog

+2003-06-25  Kazu Hirata  <kazu@cs.umass.edu>
+
+	* config/h8300/h8300.c (compute_mov_length): Adjust for the
+	new optimization.
+	* config/h8300/h8300.md (*movsi_h8300): Optimize the load of
+	an SImode constant whose upper and lower are the same.
+
 Wed Jun 25 11:31:59 CEST 2003  Jan Hubicka  <jh@suse.cz>
 
 	* varasm.c (assemble_name): Mark needed variables even when

gcc/config/h8300/h8300.c

@@ -1876,6 +1876,10 @@ compute_mov_length (rtx *operands)
 
 		  if ((INTVAL (src) & 0xffff) == 0)
 		    return 6;
+
+		  if ((INTVAL (src) & 0xffff)
+		      == ((INTVAL (src) >> 16) & 0xffff))
+		    return 6;
 		}
 	      return 8;
 	    }

gcc/config/h8300/h8300.md

@@ -396,14 +396,19 @@
 	}
       else
 	{
-	  /* See if either half is zero.  If so, use sub.w to clear
-	     that half.  */
 	  if (GET_CODE (operands[1]) == CONST_INT)
 	    {
+	      /* If either half is zero, use sub.w to clear that
+		 half.  */
 	      if ((INTVAL (operands[1]) & 0xffff) == 0)
 		return \"mov.w	%e1,%e0\;sub.w	%f0,%f0\";
 	      if (((INTVAL (operands[1]) >> 16) & 0xffff) == 0)
 		return \"sub.w	%e0,%e0\;mov.w	%f1,%f0\";
+	      /* If the upper half and the lower half are the same,
+		 copy one half to the other.  */
+	      if ((INTVAL (operands[1]) & 0xffff)
+		  == ((INTVAL (operands[1]) >> 16) & 0xffff))
+		return \"mov.w\\t%e1,%e0\;mov.w\\t%e0,%f0\";
 	    }
 	  return \"mov.w	%e1,%e0\;mov.w	%f1,%f0\";
 	}