diff --git a/gcc/loop-doloop.c b/gcc/loop-doloop.c
index f8429c4..dfc4a16 100644
--- a/gcc/loop-doloop.c
+++ b/gcc/loop-doloop.c
@@ -153,6 +153,8 @@ doloop_condition_get (rtx doloop_pat)
       else
         inc = PATTERN (prev_insn);
       /* We expect the condition to be of the form (reg != 0)  */
+      if (GET_CODE (cmp) != SET || GET_CODE (SET_SRC (cmp)) != IF_THEN_ELSE)
+	return 0;
       cond = XEXP (SET_SRC (cmp), 0);
       if (GET_CODE (cond) != NE || XEXP (cond, 1) != const0_rtx)
         return 0;