re PR target/40489 (gcc.dg/builtin-unreachable-3.c doesn't work on ia64)

2009-06-27  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/40489
	* config/ia64/ia64.c (ia64_reorg): Check NULL insn.

From-SVN: r149014

gcc/ChangeLog

+2009-06-27  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/40489
+	* config/ia64/ia64.c (ia64_reorg): Check NULL insn.
+
 2009-06-27  Paolo Bonzini  <bonzini@gnu.org>
 
 	* tree-ssa-alias.c: Fix unintentional commit.

gcc/config/ia64/ia64.c

@@ -9239,8 +9239,11 @@ ia64_reorg (void)
       insn = get_last_insn ();
       if (! INSN_P (insn))
         insn = prev_active_insn (insn);
+      if (insn)
+	{
 	  /* Skip over insns that expand to nothing.  */
-      while (GET_CODE (insn) == INSN && get_attr_empty (insn) == EMPTY_YES)
+	  while (GET_CODE (insn) == INSN
+		 && get_attr_empty (insn) == EMPTY_YES)
 	    {
 	      if (GET_CODE (PATTERN (insn)) == UNSPEC_VOLATILE
 		  && XINT (PATTERN (insn), 1) == UNSPECV_INSN_GROUP_BARRIER)
@@ -9255,6 +9258,7 @@ ia64_reorg (void)
 	      emit_insn (gen_insn_group_barrier (GEN_INT (3)));
 	    }
 	}
+    }
 
   emit_predicate_relation_info ();