* config/h8300/h8300.md (a peephole2): New.

From-SVN: r63719

gcc/ChangeLog

 2003-03-03  Kazu Hirata  <kazu@cs.umass.edu>
 
+	* config/h8300/h8300.md (a peephole2): New.
+
+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.
 

gcc/config/h8300/h8300.md

@@ -3561,6 +3561,23 @@
 		  ? gen_rtx_GE (VOIDmode, cc0_rtx, const0_rtx)
 		  : gen_rtx_LT (VOIDmode, cc0_rtx, const0_rtx));")
 
+(define_peephole2
+  [(set (match_operand:SI 0 "register_operand" "")
+	(match_operand:SI 1 "register_operand" ""))
+   (set (match_dup 0)
+	(and:SI (match_dup 0)
+		(const_int 255)))]
+  "(TARGET_H8300H || TARGET_H8300S)
+   && REG_P (operands[0])
+   && REG_P (operands[1])
+   && REGNO (operands[0]) != REGNO (operands[1])"
+  [(set (match_dup 0)
+	(const_int 0))
+   (set (strict_low_part (match_dup 2))
+	(match_dup 3))]
+  "operands[2] = gen_rtx_REG (QImode, REGNO (operands[0]));
+   operands[3] = gen_rtx_REG (QImode, REGNO (operands[1]));")
+
 ;; (compare (reg:SI) (const_int)) takes 6 bytes, so we try to achieve
 ;; the equivalent with shorter sequences.  Here is the summary.  Cases
 ;; are grouped for each define_peephole2.