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
