diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index bc6d84eeec1..2bff139228f 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1339,6 +1339,8 @@ X86TargetLowering::LowerReturn(SDValue Chain,
 }
 
 bool X86TargetLowering::isUsedByReturnOnly(SDNode *N) const {
+  // Temporarily disabled.
+  return false;
   if (N->getNumValues() != 1)
     return false;
   if (!N->hasNUsesOfValue(1, 0))
diff --git a/test/CodeGen/X86/sibcall-5.ll b/test/CodeGen/X86/sibcall-5.ll
index 4a2e7fbbe2a..24b88e4cf87 100644
--- a/test/CodeGen/X86/sibcall-5.ll
+++ b/test/CodeGen/X86/sibcall-5.ll
@@ -1,4 +1,5 @@
 ; RUN: llc < %s -march=x86-64 | FileCheck %s
+; XFAIL: *
 
 ; Sibcall optimization of expanded libcalls.
 ; rdar://8707777