h8300-protos.h: Add the prototype for same_cmp_following_p.

	* config/h8300/h8300-protos.h: Add the prototype for
	same_cmp_following_p.
	* config/h8300/h8300.c (same_cmp_following_p): New.
	* config/h8300/h8300.md (peephole2): Use it.

From-SVN: r73662

gcc/ChangeLog

 2003-11-16  Kazu Hirata  <kazu@cs.umass.edu>
 
+	* config/h8300/h8300-protos.h: Add the prototype for
+	same_cmp_following_p.
+	* config/h8300/h8300.c (same_cmp_following_p): New.
+	* config/h8300/h8300.md (peephole2): Use it.
+
+2003-11-16  Kazu Hirata  <kazu@cs.umass.edu>
+
 	* config/h8300/h8300.md: Don't use REGNO when its operand is
 	not guaranteed to be a REG.
 

gcc/config/h8300/h8300-protos.h

@@ -79,6 +79,7 @@ extern int h8300_eightbit_constant_address_p (rtx);
 extern int h8300_tiny_constant_address_p (rtx);
 extern int byte_accesses_mergeable_p (rtx, rtx);
 extern int same_cmp_preceding_p (rtx);
+extern int same_cmp_following_p (rtx);
 
 /* Used in builtins.c */
 extern rtx h8300_return_addr_rtx (int, rtx);

gcc/config/h8300/h8300.c

@@ -4514,6 +4514,26 @@ same_cmp_preceding_p (rtx i3)
 	  && any_condjump_p (i2) && onlyjump_p (i2));
 }
 
+/* Return nonzero if we have the same comparison insn as I1 two insns
+   after I1.  I1 is assumed to be a comparison insn.  */
+
+int
+same_cmp_following_p (rtx i1)
+{
+  rtx i2, i3;
+
+  /* Make sure we have a sequence of three insns.  */
+  i2 = next_nonnote_insn (i1);
+  if (i2 == NULL_RTX)
+    return 0;
+  i3 = next_nonnote_insn (i2);
+  if (i3 == NULL_RTX)
+    return 0;
+
+  return (INSN_P (i3) && rtx_equal_p (PATTERN (i1), PATTERN (i3))
+	  && any_condjump_p (i2) && onlyjump_p (i2));
+}
+
 /* Return nonzero if register OLD_REG can be renamed to register NEW_REG.  */
 
 int

gcc/config/h8300/h8300.md

@@ -4482,8 +4482,7 @@
 		      (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))))"
+   && !same_cmp_following_p (insn)"
   [(set (match_dup 4)
 	(match_dup 0))
    (set (match_dup 4)