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

From-SVN: r65098

gcc/ChangeLog

+2003-03-31  Kazu Hirata  <kazu@cs.umass.edu>
+
+	* config/h8300/h8300.md (a peephole2): New.
+
 2003-03-31  Michael Matz  <matz@suse.de>
 
 	* config/i386/i386.h (TARGET_FLT_EVAL_METHOD): Change 1 into 0.

gcc/config/h8300/h8300.md

@@ -4101,8 +4101,10 @@
 ;; dead 0xffffff?? except -1 and -2 eq/ne   xor.b and not.l
 ;; dead 0xffff??ff                  eq/ne   xor.b and not.l
 ;;
-;; dead     1                       geu/ltu and.b and test
-;; dead     3                       geu/ltu and.b and test
+;; dead     1                       geu/ltu shlr.l
+;; dead     3 (H8S)                 geu/ltu shlr.l
+;;
+;; dead     3 (H8/300H)             geu/ltu and.b and test
 ;; dead     7                       geu/ltu and.b and test
 ;; dead    15                       geu/ltu and.b and test
 ;; dead    31                       geu/ltu and.b and test
@@ -4223,6 +4225,44 @@
 		      (pc)))]
   "operands[4] = GEN_INT (INTVAL (operands[1]) ^ -1);")
 
+;; Transform
+;;
+;;	cmp.l	#1,er0
+;;	bhi	.L1
+;;
+;; into
+;;
+;;	shlr.l	er0
+;;	bne	.L1
+
+(define_peephole2
+  [(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))"
+  [(parallel [(set (match_dup 0)
+		   (lshiftrt:SI (match_dup 0)
+				(match_dup 5)))
+	      (clobber (scratch:QI))])
+   (set (cc0)
+	(match_dup 0))
+   (set (pc)
+	(if_then_else (match_dup 4)
+		      (label_ref (match_dup 3))
+		      (pc)))]
+  "operands[4] = ((GET_CODE (operands[2]) == GTU) ?
+		  gen_rtx_NE (VOIDmode, cc0_rtx, const0_rtx) :
+		  gen_rtx_EQ (VOIDmode, cc0_rtx, const0_rtx));
+   operands[5] = GEN_INT (exact_log2 (INTVAL (operands[1]) + 1));")
+
 ;; Transform A <= 1 to (A & 0xfffffffe) == 0.
 
 (define_peephole2