diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 022ef307130..5549bc1124a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2002-12-30  Kazu Hirata  <kazu@cs.umass.edu>
+
+	* config/h8300/h8300.md (*addsi3_lshiftrt_16_zexthi): New.
+
 2002-12-30  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* config/h8300/h8300.c (output_logical_op): Use extu.w if we
diff --git a/gcc/config/h8300/h8300.md b/gcc/config/h8300/h8300.md
index e66662ac62e..1a3fcd57e84 100644
--- a/gcc/config/h8300/h8300.md
+++ b/gcc/config/h8300/h8300.md
@@ -2329,6 +2329,18 @@
   [(set_attr "cc" "set_znv")
    (set_attr "length" "6")])
 
+;; plus:SI
+
+(define_insn "*addsi3_lshiftrt_16_zexthi"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(plus:SI (lshiftrt:SI (match_operand:SI 1 "register_operand" "r")
+			      (const_int 16))
+		 (zero_extend:SI (match_operand:HI 2 "register_operand" "0"))))]
+  "TARGET_H8300H || TARGET_H8300S"
+  "add.w\t%e1,%f0\;xor.w\t%e0,%e0\;rotxl.w\t%e0,%e0"
+  [(set_attr "cc" "clobber")
+   (set_attr "length" "6")])
+
 ;; ior:HI
 
 (define_insn "*iorhi3_zext"