1; RUN: opt -deadargelim -S < %s | FileCheck %s
2
3; Verify that the dbg.value intrinsics that use the dead argument and return
4; value are marked as undef to indicate that the values are optimized out.
5
6; Reproducer for PR23260.
7
8; CHECK-LABEL: define internal void @bar()
9; CHECK: call void @llvm.dbg.value(metadata i32 undef, metadata ![[LOCAL1:[0-9]+]]
10; CHECK: call void @sink()
11
12; Function Attrs: alwaysinline nounwind uwtable
13define internal i32 @bar(i32 %deadarg) #1 !dbg !10 {
14entry:
15  call void @llvm.dbg.value(metadata i32 %deadarg, metadata !15, metadata !DIExpression()), !dbg !17
16  call void @sink(), !dbg !17
17  ret i32 123, !dbg !17
18}
19
20; CHECK-LABEL: define void @foo()
21; CHECK: call void @bar()
22; CHECK: call void @llvm.dbg.value(metadata i32 undef, metadata ![[LOCAL2:[0-9]+]]
23; CHECK: call void @bar()
24
25; Function Attrs: nounwind uwtable
26define void @foo() #0 !dbg !6 {
27entry:
28  %deadret = call i32 @bar(i32 0), !dbg !9
29  call void @llvm.dbg.value(metadata i32 %deadret, metadata !16, metadata !DIExpression()), !dbg !9
30  call i32 @bar(i32 1), !dbg !9
31  ret void, !dbg !9
32}
33
34declare void @sink() local_unnamed_addr
35
36; Function Attrs: nounwind readnone speculatable
37declare void @llvm.dbg.value(metadata, metadata, metadata) #2
38
39attributes #0 = { nounwind uwtable }
40attributes #1 = { alwaysinline nounwind uwtable }
41attributes #2 = { nounwind readnone speculatable }
42
43!llvm.dbg.cu = !{!0}
44!llvm.module.flags = !{!3, !4}
45!llvm.ident = !{!5}
46
47; CHECK: ![[LOCAL1]] = !DILocalVariable(name: "local1"
48; CHECK: ![[LOCAL2]] = !DILocalVariable(name: "local2"
49
50!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
51!1 = !DIFile(filename: "pr23260.c", directory: "/")
52!2 = !{}
53!3 = !{i32 2, !"Dwarf Version", i32 4}
54!4 = !{i32 2, !"Debug Info Version", i32 3}
55!5 = !{!"clang version 8.0.0"}
56!6 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !7, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
57!7 = !DISubroutineType(types: !8)
58!8 = !{null}
59!9 = !DILocation(line: 4, column: 3, scope: !6)
60!10 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 2, type: !11, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !14)
61!11 = !DISubroutineType(types: !12)
62!12 = !{!13, !13}
63!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
64!14 = !{!15}
65!15 = !DILocalVariable(name: "local1", arg: 1, scope: !10, file: !1, line: 2, type: !13)
66!16 = !DILocalVariable(name: "local2", arg: 1, scope: !6, file: !1, line: 2, type: !13)
67!17 = !DILocation(line: 2, column: 52, scope: !10)
68