--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/CodeGen/X86/2010-10-08-cmpxchg8b.ll	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,26 @@
+; RUN: llc < %s -march=x86 -mtriple=i386-apple-darwin | FileCheck %s
+; PR8297
+;
+; On i386, i64 cmpxchg is lowered during legalize types to extract the
+; 64-bit result into a pair of fixed regs. So creation of the DAG node
+; happens in a different place. See
+; X86TargetLowering::ReplaceNodeResults, case ATOMIC_CMP_SWAP.
+;
+; Neither Atomic-xx.ll nor atomic_op.ll cover this. Those tests were
+; autogenerated from C source before 64-bit variants were supported.
+;
+; Note that this case requires a loop around the cmpxchg to force
+; machine licm to query alias anlysis, exposing a bad
+; MachineMemOperand.
+define void @foo(i64* %ptr) nounwind inlinehint {
+entry:
+  br label %loop
+loop:
+; CHECK: lock
+; CHECK-NEXT: cmpxchg8b
+  %r = cmpxchg i64* %ptr, i64 0, i64 1 monotonic
+  %stored1  = icmp eq i64 %r, 0
+  br i1 %stored1, label %loop, label %continue
+continue:
+  ret void
+}