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      1 ; RUN: llc < %s -march=x86 -mtriple=i386-apple-darwin | FileCheck %s
      2 ; PR8297
      3 ;
      4 ; On i386, i64 cmpxchg is lowered during legalize types to extract the
      5 ; 64-bit result into a pair of fixed regs. So creation of the DAG node
      6 ; happens in a different place. See
      7 ; X86TargetLowering::ReplaceNodeResults, case ATOMIC_CMP_SWAP.
      8 ;
      9 ; Neither Atomic-xx.ll nor atomic_op.ll cover this. Those tests were
     10 ; autogenerated from C source before 64-bit variants were supported.
     11 ;
     12 ; Note that this case requires a loop around the cmpxchg to force
     13 ; machine licm to query alias anlysis, exposing a bad
     14 ; MachineMemOperand.
     15 define void @foo(i64* %ptr) nounwind inlinehint {
     16 entry:
     17   br label %loop
     18 loop:
     19 ; CHECK: lock
     20 ; CHECK-NEXT: cmpxchg8b
     21   %r = cmpxchg i64* %ptr, i64 0, i64 1 monotonic
     22   %stored1  = icmp eq i64 %r, 0
     23   br i1 %stored1, label %loop, label %continue
     24 continue:
     25   ret void
     26 }
     27