blob: 0e4118a2a9125204e14c0969a15adf69d7c68289 [file] [log] [blame]
; 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 {
br label %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
ret void