diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 066668a84f31..8ce7152a5f87 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2003-07-18  Kazu Hirata  <kazu@cs.umass.edu>
+
+	* combine.c (simplify_comparison): Don't share rtx when converting 
+	(ne (and (not X) 1) 0) to (eq (and X 1) 0).
+
 2003-07-18  David Edelsohn  <edelsohn@gnu.org>
 
 	* config/rs6000/aix.h (AGGREGATE_PADDING_FIXED): Define.
diff --git a/gcc/combine.c b/gcc/combine.c
index 883f504a50b8..30dd97aff3d6 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -11072,7 +11072,7 @@ simplify_comparison (enum rtx_code code, rtx *pop0, rtx *pop1)
 	      && GET_CODE (XEXP (op0, 0)) == NOT)
 	    {
 	      op0 = simplify_and_const_int
-		(op0, mode, XEXP (XEXP (op0, 0), 0), (HOST_WIDE_INT) 1);
+		(NULL_RTX, mode, XEXP (XEXP (op0, 0), 0), (HOST_WIDE_INT) 1);
 	      code = (code == NE ? EQ : NE);
 	      continue;
 	    }