+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
? 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.