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

From-SVN: r65172

gcc/ChangeLog

+2003-04-02  Kazu Hirata  <kazu@cs.umass.edu>
+
+	* config/h8300/h8300.md (a peephole2): New.
+
 2003-04-02  Richard Henderson  <rth@redhat.com>
 
 	* except.c (sjlj_find_directly_reachable_regions): Recognize when

gcc/config/h8300/h8300.md

@@ -4101,6 +4101,9 @@
 ;; dead 0xffffff?? except -1 and -2 eq/ne   xor.b and not.l
 ;; dead 0xffff??ff                  eq/ne   xor.b and not.l
 ;;
+;; live     1                       geu/ltu copy and shlr.l
+;; live     3 (H8S)                 geu/ltu copy and shlr.l
+;;
 ;; dead     1                       geu/ltu shlr.l
 ;; dead     3 (H8S)                 geu/ltu shlr.l
 ;;
@@ -4232,6 +4235,48 @@
 ;;
 ;; into
 ;;
+;;	mov.l	er0,er1
+;;	shlr.l	er1
+;;	bne	.L1
+
+(define_peephole2
+  [(match_scratch:SI 4 "r")
+   (set (cc0)
+	(compare (match_operand:SI 0 "register_operand" "")
+		 (match_operand:SI 1 "const_int_operand" "")))
+   (set (pc)
+	(if_then_else (match_operator 2 "gtuleu_operator"
+			[(cc0) (const_int 0)])
+		      (label_ref (match_operand 3 "" ""))
+		      (pc)))]
+  "(TARGET_H8300H || TARGET_H8300S)
+   && !peep2_reg_dead_p (1, operands[0])
+   && (INTVAL (operands[1]) == 1
+	|| (TARGET_H8300S && INTVAL (operands[1]) == 3))"
+  [(set (match_dup 4)
+	(match_dup 0))
+   (parallel [(set (match_dup 4)
+		   (lshiftrt:SI (match_dup 4)
+				(match_dup 6)))
+	      (clobber (scratch:QI))])
+   (set (cc0)
+	(match_dup 4))
+   (set (pc)
+	(if_then_else (match_dup 5)
+		      (label_ref (match_dup 3))
+		      (pc)))]
+  "operands[5] = ((GET_CODE (operands[2]) == GTU) ?
+		  gen_rtx_NE (VOIDmode, cc0_rtx, const0_rtx) :
+		  gen_rtx_EQ (VOIDmode, cc0_rtx, const0_rtx));
+   operands[6] = GEN_INT (exact_log2 (INTVAL (operands[1]) + 1));")
+
+;; Transform
+;;
+;;	cmp.l	#1,er0
+;;	bhi	.L1
+;;
+;; into
+;;
 ;;	shlr.l	er0
 ;;	bne	.L1