diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d132863abda3..bda9ea2aa6d4 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2007-09-06  Jan Hubicka  <jh@suse.cz>
+
+	PR target/33318
+	* cse.c (fold_rtx): Avoid invalid sharing.
+
 2007-09-06  Richard Sandiford  <richard@codesourcery.com>
 
 	* config/mips/mips.md (fixuns_truncdfsi2, fixuns_truncdfdi2)
diff --git a/gcc/cse.c b/gcc/cse.c
index fc4f895c8b0c..590adfad7b4b 100644
--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -3246,7 +3246,8 @@ fold_rtx (rtx x, rtx insn)
 		      /* If we have a cheaper expression now, use that
 			 and try folding it further, from the top.  */
 		      if (cheapest_simplification != x)
-			return fold_rtx (cheapest_simplification, insn);
+			return fold_rtx (copy_rtx (cheapest_simplification),
+					 insn);
 		    }
 		}