h8300.md (*extzv_8_8): Use shorter code when operands[0] and operands[1] are different.

	* config/h8300/h8300.md (*extzv_8_8): Use shorter code when
	operands[0] and operands[1] are different.

From-SVN: r63718

gcc/ChangeLog

-2003-03-02  Kazu Hirata  <kazu@cs.umass.edu>
+2003-03-03  Kazu Hirata  <kazu@cs.umass.edu>
+
+	* config/h8300/h8300.md (*extzv_8_8): Use shorter code when
+	operands[0] and operands[1] are different.
+
+2003-03-03  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* reload1.c (reload_cse_move2add): Remove variable success.
 

gcc/config/h8300/h8300.md

@@ -2630,7 +2630,14 @@
 			 (const_int 8)
 			 (const_int 8)))]
   "TARGET_H8300H || TARGET_H8300S"
-  "mov.b\\t%x1,%w0\;extu.w\\t%f0\;extu.l\\t%S0"
+  "*
+{
+  if (REG_P (operands[0]) && REG_P (operands[1])
+      && REGNO (operands[0]) != REGNO (operands[1]))
+    return \"sub.l\\t%S0,%S0\;mov.b\\t%x1,%w0\";
+  else
+    return \"mov.b\\t%x1,%w0\;extu.w\\t%f0\;extu.l\\t%S0\";
+}"
   [(set_attr "cc" "set_znv")
    (set_attr "length" "6")])