2010-10-11 21:02:04 +02:00
|
|
|
; RUN: llc < %s -march=x86 -mtriple=i386-apple-darwin | FileCheck %s
|
2010-10-11 23:08:42 +02:00
|
|
|
; PR8297
|
2010-10-11 21:02:04 +02:00
|
|
|
;
|
|
|
|
|
; 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
|
2011-09-27 01:15:09 +02:00
|
|
|
%r = cmpxchg i64* %ptr, i64 0, i64 1 monotonic
|
2010-10-11 21:02:04 +02:00
|
|
|
%stored1 = icmp eq i64 %r, 0
|
|
|
|
|
br i1 %stored1, label %loop, label %continue
|
|
|
|
|
continue:
|
|
|
|
|
ret void
|
|
|
|
|
}
|
