gen_rtx_NE (VOIDmode, cc0_rtx, const0_rtx) :
gen_rtx_EQ (VOIDmode, cc0_rtx, const0_rtx));")
+;; For constants like -1, -2, 1, 2, it is still cheaper to make a copy
+;; of the register being tested, do the subtraction on the copy, and
+;; then test the copy. We avoid this transformation if we see more
+;; than one copy of the same compare insn.
+
+(define_peephole2
+ [(match_scratch:SI 4 "r")
+ (set (cc0)
+ (compare:SI (match_operand:SI 0 "register_operand" "")
+ (match_operand:SI 1 "incdec_operand" "")))
+ (set (pc)
+ (if_then_else (match_operator 3 "eqne_operator"
+ [(cc0) (const_int 0)])
+ (label_ref (match_operand 2 "" ""))
+ (pc)))]
+ "(TARGET_H8300H || TARGET_H8300S)
+ && !peep2_reg_dead_p (1, operands[0])
+ && !rtx_equal_p (PATTERN (insn),
+ PATTERN (next_nonnote_insn (next_nonnote_insn (insn))))"
+ [(set (cc0)
+ (match_dup 0))
+ (set (pc)
+ (if_then_else (match_op_dup 3 [(cc0) (const_int 0)])
+ (label_ref (match_dup 2))
+ (pc)))]
+ "emit_move_insn (operands[4], operands[0]);
+ operands[0] = operands[4];
+ operands[1] = GEN_INT (- INTVAL (operands[1]));
+ split_adds_subs (SImode, operands, 1);")
+
;; Narrow the mode of testing if possible.
(define_peephole2