diff --git a/test/CodeGen/ext-vector.c b/test/CodeGen/ext-vector.c
index 249142a..e3b6211 100644
--- a/test/CodeGen/ext-vector.c
+++ b/test/CodeGen/ext-vector.c
@@ -74,14 +74,17 @@
   a *= c;
   a /= c;
 
+  // Vector comparisons can sometimes crash the x86 backend: rdar://6326239,
+  // reject them until the implementation is stable.
+#if 0
   int4 cmp;
-
   cmp = a < b;
   cmp = a <= b;
   cmp = a < b;
   cmp = a >= b;
   cmp = a == b;
   cmp = a != b;
+#endif
 }
 
 void test7(int4 *ap, int4 *bp, int c) {
@@ -112,12 +115,15 @@
   a /= c;
   a %= c;
 
+  // Vector comparisons can sometimes crash the x86 backend: rdar://6326239,
+  // reject them until the implementation is stable.
+#if 0
   int4 cmp;
-
   cmp = a < b;
   cmp = a <= b;
   cmp = a < b;
   cmp = a >= b;
   cmp = a == b;
   cmp = a != b;
+#endif
 }