llvm/test/Transforms/GVN/lifetime-simple.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt < %s -passes=gvn -S | FileCheck %s

define i8 @test() nounwind {
; CHECK-LABEL: define i8 @test(
; CHECK-SAME: ) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[P:%.*]] = alloca [32 x i8], align 1
; CHECK-NEXT:    call void @llvm.lifetime.start.p0(ptr [[P]])
; CHECK-NEXT:    store i8 1, ptr [[P]], align 1
; CHECK-NEXT:    call void @llvm.lifetime.end.p0(ptr [[P]])
; CHECK-NEXT:    [[TMP0:%.*]] = load i8, ptr [[P]], align 1
; CHECK-NEXT:    ret i8 [[TMP0]]
;
entry:
  %P = alloca [32 x i8]
  call void @llvm.lifetime.start.p0(ptr %P)
  %0 = load i8, ptr %P
  store i8 1, ptr %P
  call void @llvm.lifetime.end.p0(ptr %P)
  %1 = load i8, ptr %P
  ret i8 %1
}

define void @assume_eq_arg(ptr %arg) {
; CHECK-LABEL: define void @assume_eq_arg(
; CHECK-SAME: ptr [[ARG:%.*]]) {
; CHECK-NEXT:    [[ALLOCA:%.*]] = alloca i32, align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq ptr [[ALLOCA]], [[ARG]]
; CHECK-NEXT:    call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT:    call void @llvm.lifetime.start.p0(ptr [[ALLOCA]])
; CHECK-NEXT:    store volatile i32 0, ptr [[ALLOCA]], align 4
; CHECK-NEXT:    call void @llvm.lifetime.end.p0(ptr [[ALLOCA]])
; CHECK-NEXT:    ret void
;
  %alloca = alloca i32
  %cmp = icmp eq ptr %alloca, %arg
  call void @llvm.assume(i1 %cmp)
  call void @llvm.lifetime.start.p0(ptr %alloca)
  store volatile i32 0, ptr %alloca
  call void @llvm.lifetime.end.p0(ptr %alloca)
  ret void
}

define void @assume_eq_null() {
; CHECK-LABEL: define void @assume_eq_null() {
; CHECK-NEXT:    [[ALLOCA:%.*]] = alloca i32, align 4, addrspace(1)
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq ptr addrspace(1) [[ALLOCA]], null
; CHECK-NEXT:    call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT:    call void @llvm.lifetime.start.p1(ptr addrspace(1) [[ALLOCA]])
; CHECK-NEXT:    store volatile i32 0, ptr addrspace(1) null, align 4
; CHECK-NEXT:    call void @llvm.lifetime.end.p1(ptr addrspace(1) [[ALLOCA]])
; CHECK-NEXT:    ret void
;
  %alloca = alloca i32, addrspace(1)
  %cmp = icmp eq ptr addrspace(1) %alloca, null
  call void @llvm.assume(i1 %cmp)
  call void @llvm.lifetime.start.p1(ptr addrspace(1) %alloca)
  store volatile i32 0, ptr addrspace(1) %alloca
  call void @llvm.lifetime.end.p1(ptr addrspace(1) %alloca)
  ret void
}

define void @dom_eq_null() {
; CHECK-LABEL: define void @dom_eq_null() {
; CHECK-NEXT:    [[ALLOCA:%.*]] = alloca i32, align 4, addrspace(1)
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq ptr addrspace(1) [[ALLOCA]], null
; CHECK-NEXT:    br i1 [[CMP]], label %[[IF:.*]], label %[[ELSE:.*]]
; CHECK:       [[IF]]:
; CHECK-NEXT:    call void @llvm.lifetime.start.p1(ptr addrspace(1) [[ALLOCA]])
; CHECK-NEXT:    store volatile i32 0, ptr addrspace(1) null, align 4
; CHECK-NEXT:    call void @llvm.lifetime.end.p1(ptr addrspace(1) [[ALLOCA]])
; CHECK-NEXT:    ret void
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    ret void
;
  %alloca = alloca i32, addrspace(1)
  %cmp = icmp eq ptr addrspace(1) %alloca, null
  br i1 %cmp, label %if, label %else

if:
  call void @llvm.lifetime.start.p1(ptr addrspace(1) %alloca)
  store volatile i32 0, ptr addrspace(1) %alloca
  call void @llvm.lifetime.end.p1(ptr addrspace(1) %alloca)
  ret void

else:
  ret void
}

declare void @llvm.lifetime.start.p0(ptr nocapture %P) readonly
declare void @llvm.lifetime.end.p0(ptr nocapture %P)