Do not try to combine a sequence of insns when the second insn has been

replaced by a note.

From-SVN: r33398

gcc/ChangeLog

+2000-04-24  Nick Clifton  <nickc@redhat.com>
+
+	* combine.c (combine_instructions): Do not try to combine a
+	sequence of insns when the second insn has been replaced by a
+	note.
+
 Mon Apr 24 17:34:18 2000  Mumit Khan  <khan@xraylith.wisc.edu>
 
 	* gcc.c (load_specs): New static function.

gcc/combine.c

@@ -646,12 +646,21 @@ combine_instructions (f, nregs)
 	  /* Try each sequence of three linked insns ending with this one.  */
 
 	  for (links = LOG_LINKS (insn); links; links = XEXP (links, 1))
-	    for (nextlinks = LOG_LINKS (XEXP (links, 0)); nextlinks;
-		 nextlinks = XEXP (nextlinks, 1))
-	      if ((next = try_combine (insn, XEXP (links, 0),
-				       XEXP (nextlinks, 0),
-				       &new_direct_jump_p)) != 0)
-		goto retry;
+	    {
+	      rtx link = XEXP (links, 0);
+
+	      /* If the linked insn has been replaced by a note, then there
+		 is no point in persuing this chain any further.  */
+	      if (GET_CODE (link) == NOTE)
+		break;
+
+	      for (nextlinks = LOG_LINKS (link);
+		   nextlinks;
+		   nextlinks = XEXP (nextlinks, 1))
+		if ((next = try_combine (insn, XEXP (links, 0),
+					 XEXP (nextlinks, 0))) != 0)
+		  goto retry;
+	    }
 
 #ifdef HAVE_cc0
 	  /* Try to combine a jump insn that uses CC0