third_party/llvm-7.0/llvm/test/CodeGen/X86/cmpxchg-i1.ll

; RUN: llc -mtriple=x86_64 -o - %s | FileCheck %s

define i1 @try_cmpxchg(i32* %addr, i32 %desired, i32 %new) {
; CHECK-LABEL: try_cmpxchg:
; CHECK: cmpxchgl
; CHECK-NOT: cmp
; CHECK: sete %al
; CHECK: retq
  %pair = cmpxchg i32* %addr, i32 %desired, i32 %new seq_cst seq_cst
  %success = extractvalue { i32, i1 } %pair, 1
  ret i1 %success
}

define void @cmpxchg_flow(i64* %addr, i64 %desired, i64 %new) {
; CHECK-LABEL: cmpxchg_flow:
; CHECK: cmpxchgq
; CHECK-NOT: cmp
; CHECK-NOT: set
; CHECK: {{jne|jeq}}
  %pair = cmpxchg i64* %addr, i64 %desired, i64 %new seq_cst seq_cst
  %success = extractvalue { i64, i1 } %pair, 1
  br i1 %success, label %true, label %false

true:
  call void @foo()
  ret void

false:
  call void @bar()
  ret void
}

define i64 @cmpxchg_sext(i32* %addr, i32 %desired, i32 %new) {
; CHECK-LABEL: cmpxchg_sext:
; CHECK-DAG: cmpxchgl
; CHECK-NOT: cmpl
; CHECK: sete %cl
; CHECK: retq
  %pair = cmpxchg i32* %addr, i32 %desired, i32 %new seq_cst seq_cst
  %success = extractvalue { i32, i1 } %pair, 1
  %mask = sext i1 %success to i64
  ret i64 %mask
}

define i32 @cmpxchg_zext(i32* %addr, i32 %desired, i32 %new) {
; CHECK-LABEL: cmpxchg_zext:
; CHECK: xorl %e[[R:[a-z]]]x
; CHECK: cmpxchgl
; CHECK-NOT: cmp
; CHECK: sete %[[R]]l
  %pair = cmpxchg i32* %addr, i32 %desired, i32 %new seq_cst seq_cst
  %success = extractvalue { i32, i1 } %pair, 1
  %mask = zext i1 %success to i32
  ret i32 %mask
}


define i32 @cmpxchg_use_eflags_and_val(i32* %addr, i32 %offset) {
; CHECK-LABEL: cmpxchg_use_eflags_and_val:
; CHECK: movl (%rdi), %e[[OLDVAL:[a-z0-9]+]]

; CHECK: [[LOOPBB:.?LBB[0-9]+_[0-9]+]]:
; CHECK: leal (%r[[OLDVAL]],%rsi), [[NEW:%[a-z0-9]+]]
; CHECK: cmpxchgl [[NEW]], (%rdi)
; CHECK-NOT: cmpl
; CHECK: jne [[LOOPBB]]

  ; Result already in %eax
; CHECK: retq
entry:
  %init = load atomic i32, i32* %addr seq_cst, align 4
  br label %loop

loop:
  %old = phi i32 [%init, %entry], [%oldval, %loop]
  %new = add i32 %old, %offset
  %pair = cmpxchg i32* %addr, i32 %old, i32 %new seq_cst seq_cst
  %oldval = extractvalue { i32, i1 } %pair, 0
  %success = extractvalue { i32, i1 } %pair, 1
  br i1 %success, label %done, label %loop

done:
  ret i32 %oldval
}

declare void @foo()
declare void @bar()