1; XFAIL: *
2
3; RUN: opt -S -basic-aa -dse < %s | FileCheck %s
4
5; We DSE stack alloc'ed and byval locations, in the presence of fences.
6; Fence does not make an otherwise thread local store visible.
7; Right now the DSE in presence of fence is only done in end blocks (with no successors),
8; but the same logic applies to other basic blocks as well.
9; The store to %addr.i can be removed since it is a byval attribute
10define void @test3(i32* byval(i32) %addr.i) {
11; CHECK-LABEL: @test3
12; CHECK-NOT: store
13; CHECK: fence
14; CHECK: ret
15  store i32 5, i32* %addr.i, align 4
16  fence release
17  ret void
18}
19
20declare void @foo(i8* nocapture %p)
21
22declare noalias i8* @malloc(i32)
23
24; DSE of stores in locations allocated through library calls.
25define void @test_nocapture() {
26; CHECK-LABEL: @test_nocapture
27; CHECK: malloc
28; CHECK: foo
29; CHECK-NOT: store
30; CHECK: fence
31  %m  =  call i8* @malloc(i32 24)
32  call void @foo(i8* %m)
33  store i8 4, i8* %m
34  fence release
35  ret void
36}
37
38
39; This is a full fence, but it does not make a thread local store visible.
40; We can DSE the store in presence of the fence.
41define void @fence_seq_cst() {
42; CHECK-LABEL: @fence_seq_cst
43; CHECK-NEXT: fence seq_cst
44; CHECK-NEXT: ret void
45  %P1 = alloca i32
46  store i32 0, i32* %P1, align 4
47  fence seq_cst
48  store i32 4, i32* %P1, align 4
49  ret void
50}
51