; 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 %pair = cmpxchg i64* %ptr, i64 0, i64 1 monotonic monotonic %r = extractvalue { i64, i1 } %pair, 0 %stored1 = icmp eq i64 %r, 0 br i1 %stored1, label %loop, label %continue continue: ret void }