jump.c (delete_insn): Check that REG_LABEL note actually contains a CODE_LABEL.

	* jump.c (delete_insn): Check that REG_LABEL note actually contains
	a CODE_LABEL.

From-SVN: r37835

gcc/ChangeLog

+Wed Nov 29 00:08:23 2000  J"orn Rennecke <amylaar@redhat.com>
+
+	* jump.c (delete_insn): Check that REG_LABEL note actually contains
+	a CODE_LABEL.
+
 2000-11-28  Neil Booth  <neilb@earthling.net>
 
         * c-common.h: Remove flag_digraphs.

gcc/jump.c

@@ -2857,7 +2857,9 @@ delete_insn (insn)
   /* Likewise for an ordinary INSN / CALL_INSN with a REG_LABEL note.  */
   if (GET_CODE (insn) == INSN || GET_CODE (insn) == CALL_INSN)
     for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
-      if (REG_NOTE_KIND (note) == REG_LABEL)
+      if (REG_NOTE_KIND (note) == REG_LABEL
+	  /* This could also be a NOTE_INSN_DELETED_LABEL note.  */
+	  && GET_CODE (XEXP (note, 0)) == CODE_LABEL)
 	if (--LABEL_NUSES (XEXP (note, 0)) == 0)
 	  delete_insn (XEXP (note, 0));