1; RUN: llc -start-after=codegenprepare -stop-before finalize-isel -o - %s | FileCheck %s
2
3; Test that dbg.values of an SSA variable that's not used in a basic block,
4; is converted to a DBG_VALUE in that same basic block. We know that %1 is
5; live from the entry bb to the exit bb, is allocated a vreg because it's
6; used across basic blocks. We should be able to produce a DBG_VALUE that
7; refers to it in the nextbb block.
8
9source_filename = "debug.c"
10target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
11target triple = "x86_64-unknown-linux-gnu"
12
13; Function Attrs: nounwind uwtable
14define dso_local i32 @main(i32 %arg0, i32 %arg1) local_unnamed_addr !dbg !11 {
15entry:
16  %0 = add i32 %arg0, 42, !dbg !26
17  %1 = add i32 %arg1, 101, !dbg !26
18  %cmp = icmp eq i32 %1, 0
19  br i1 %cmp, label %nextbb, label %exit, !dbg !26
20
21nextbb:
22; CHECK-LABEL: bb.{{.*}}.nextbb
23  %2 = mul i32 %0, %arg1, !dbg !26
24; CHECK: IMUL32rr
25  call void @llvm.dbg.value(metadata i32 %1, metadata !16, metadata !DIExpression()), !dbg !27
26; CHECK-NEXT: DBG_VALUE
27  br label %exit, !dbg !26
28
29; CHECK-LABEL: bb.{{.*}}.exit
30exit:
31  %3 = phi i32 [ 12, %entry ], [ %2, %nextbb ], !dbg !26
32  %4 = add i32 %1, %3, !dbg !26
33  ret i32 %4, !dbg !26
34}
35
36declare void @llvm.dbg.value(metadata, metadata, metadata)
37
38!llvm.dbg.cu = !{!2}
39!llvm.module.flags = !{!7, !8, !9}
40!llvm.ident = !{!10}
41
42!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 7.0.0 (x)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4)
43!3 = !DIFile(filename: "debug.c", directory: "")
44!4 = !{}
45!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
46!7 = !{i32 2, !"Dwarf Version", i32 4}
47!8 = !{i32 2, !"Debug Info Version", i32 3}
48!9 = !{i32 1, !"wchar_size", i32 4}
49!10 = !{!"clang version 7.0.0 (x)"}
50!11 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 3, type: !12, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !2, retainedNodes: !14)
51!12 = !DISubroutineType(types: !13)
52!13 = !{!6}
53!14 = !{!16}
54!16 = !DILocalVariable(name: "y", scope: !11, file: !3, line: 5, type: !6)
55!26 = !DILocation(line: 4, column: 7, scope: !11)
56!27 = !DILocation(line: 5, column: 7, scope: !11)
57!31 = !{!32, !32, i64 0}
58!32 = !{!"int", !33, i64 0}
59!33 = !{!"omnipotent char", !34, i64 0}
60!34 = !{!"Simple C/C++ TBAA"}
61