diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 47d63a612ac..01f8bd4a327 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2001-11-30 Alan Matsuoka <alanm@redhat.com>
+
+	* combine.c (combine_simplify_rtx) : Can't simplify 
+	cases that use mode class MODE_CC.
+
 2001-12-11  Richard Henderson  <rth@redhat.com>
 
 	* expmed.c (expand_divmod): Ignore sdiv_pow2_cheap for modes in
diff --git a/gcc/combine.c b/gcc/combine.c
index 4a58e7194cd..090f3dff5c5 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -3796,6 +3796,8 @@ combine_simplify_rtx (x, op0_mode, last, in_dest)
 	  && subreg_lowpart_offset (mode, op0_mode) == SUBREG_BYTE (x))
 	return gen_lowpart_for_combine (mode, SUBREG_REG (x));
 
+      if (GET_MODE_CLASS (GET_MODE (SUBREG_REG (x))) == MODE_CC)
+        break;
       {
 	rtx temp;
 	temp = simplify_subreg (mode, SUBREG_REG (x), op0_mode,