1; RUN: opt -S -basic-aa -dse -enable-dse-memoryssa=false < %s | FileCheck %s
2
3target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
4
5declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) nounwind
6declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) nounwind
7declare void @llvm.memset.p0i8.i8(i8* nocapture, i8, i8, i1) nounwind
8
9define void @test1() {
10; CHECK-LABEL: @test1(
11  %A = alloca i8
12
13  store i8 0, i8* %A  ;; Written to by memset
14  call void @llvm.lifetime.end.p0i8(i64 1, i8* %A)
15; CHECK-NOT: lifetime.end
16
17  call void @llvm.memset.p0i8.i8(i8* %A, i8 0, i8 -1, i1 false)
18; CHECK-NOT: memset
19
20  ret void
21; CHECK: ret void
22}
23
24define void @test2(i32* %P) {
25; CHECK: test2
26  %Q = getelementptr i32, i32* %P, i32 1
27  %R = bitcast i32* %Q to i8*
28  call void @llvm.lifetime.start.p0i8(i64 4, i8* %R)
29  store i32 0, i32* %Q  ;; This store is dead.
30; CHECK-NOT: store
31  call void @llvm.lifetime.end.p0i8(i64 4, i8* %R)
32  ret void
33}
34
35
36