1; RUN: opt -passes='module(debugify),function(dce)' -S < %s | FileCheck %s
2
3; CHECK-LABEL: @test
4define void @test() {
5  %add = add i32 1, 2
6; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 1, metadata [[add:![0-9]+]], metadata !DIExpression(DW_OP_plus_uconst, 2, DW_OP_stack_value))
7  %sub = sub i32 %add, 1
8; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 1, metadata [[sub:![0-9]+]], metadata !DIExpression(DW_OP_plus_uconst, 2, DW_OP_constu, 1, DW_OP_minus, DW_OP_stack_value))
9; CHECK-NEXT: ret void
10  ret void
11}
12
13declare void @llvm.lifetime.start.p0(i64, ptr nocapture) nounwind
14declare void @llvm.lifetime.end.p0(i64, ptr nocapture) nounwind
15
16; CHECK-LABEL: @test_lifetime_alloca
17define i32 @test_lifetime_alloca() {
18; Check that lifetime intrinsics are removed along with the pointer.
19; CHECK-NEXT: @llvm.dbg.value
20; CHECK-NEXT: ret i32 0
21; CHECK-NOT: llvm.lifetime.start
22; CHECK-NOT: llvm.lifetime.end
23  %i = alloca i8, align 4
24  call void @llvm.lifetime.start.p0(i64 -1, ptr %i)
25  call void @llvm.lifetime.end.p0(i64 -1, ptr %i)
26  ret i32 0
27}
28
29; CHECK-LABEL: @test_lifetime_arg
30define i32 @test_lifetime_arg(ptr) {
31; Check that lifetime intrinsics are removed along with the pointer.
32; CHECK-NEXT: llvm.dbg.value
33; CHECK-NEXT: ret i32 0
34; CHECK-NOT: llvm.lifetime.start
35; CHECK-NOT: llvm.lifetime.end
36  call void @llvm.lifetime.start.p0(i64 -1, ptr %0)
37  call void @llvm.lifetime.end.p0(i64 -1, ptr %0)
38  ret i32 0
39}
40
41@glob = global i8 1
42
43; CHECK-LABEL: @test_lifetime_global
44define i32 @test_lifetime_global() {
45; Check that lifetime intrinsics are removed along with the pointer.
46; CHECK-NEXT: llvm.dbg.value
47; CHECK-NEXT: ret i32 0
48; CHECK-NOT: llvm.lifetime.start
49; CHECK-NOT: llvm.lifetime.end
50  call void @llvm.lifetime.start.p0(i64 -1, ptr @glob)
51  call void @llvm.lifetime.end.p0(i64 -1, ptr @glob)
52  ret i32 0
53}
54
55; CHECK-LABEL: @test_lifetime_bitcast
56define i32 @test_lifetime_bitcast(ptr) {
57; Check that lifetime intrinsics are NOT removed when the pointer is a bitcast.
58; It's not uncommon for two bitcasts to be made: one for lifetime, one for use.
59; TODO: Support the above case.
60; CHECK-NEXT: bitcast
61; CHECK-NEXT: llvm.dbg.value
62; CHECK-NEXT: llvm.lifetime.start
63; CHECK-NEXT: llvm.lifetime.end
64; CHECK-NEXT: ret i32 0
65  %2 = bitcast ptr %0 to ptr
66  call void @llvm.lifetime.start.p0(i64 -1, ptr %2)
67  call void @llvm.lifetime.end.p0(i64 -1, ptr %2)
68  ret i32 0
69}
70
71; CHECK: [[add]] = !DILocalVariable
72; CHECK: [[sub]] = !DILocalVariable
73