xref: /llvm-project/llvm/test/DebugInfo/Generic/assignment-tracking/mem2reg/single-block-alloca.ll (revision 094572701dce4aaf36f4521d6cf750420d39f206) 
1; RUN: opt -passes=mem2reg -S %s -o - \
2; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
3; RUN: opt --try-experimental-debuginfo-iterators -passes=mem2reg -S %s -o - \
4; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
5
6;; Test assignment tracking debug info when mem2reg promotes a single-block
7;; alloca. Check the output when the stores are tagged and also untagged (test
8;; manually updated for the latter by linking a dbg.assgin for another variable
9;; "b" to the alloca).
10
11; CHECK: entry:
12; CHECK-NEXT: #dbg_value(i32 %a, ![[B:[0-9]+]]
13; CHECK-NEXT: #dbg_value(i32 %a, ![[A:[0-9]+]]
14; CHECK-NEXT: %add =
15; CHECK-NEXT: #dbg_value(i32 %add, ![[B]]
16; CHECK-NEXT: #dbg_value(i32 %add, ![[A]]
17
18; CHECK-DAG: ![[A]] = !DILocalVariable(name: "a",
19; CHECK-DAG: ![[B]] = !DILocalVariable(name: "b",
20
21;; $ cat test.cpp
22;; int f(int a) {
23;;   a += 1;
24;;   return a;
25;; }
26
27define dso_local noundef i32 @_Z1fi(i32 noundef %a) !dbg !7 {
28entry:
29  %a.addr = alloca i32, align 4, !DIAssignID !13
30  call void @llvm.dbg.assign(metadata i1 undef, metadata !12, metadata !DIExpression(), metadata !13, metadata ptr %a.addr, metadata !DIExpression()), !dbg !14
31  call void @llvm.dbg.assign(metadata i1 undef, metadata !24, metadata !DIExpression(), metadata !13, metadata ptr %a.addr, metadata !DIExpression()), !dbg !14
32  store i32 %a, ptr %a.addr, align 4, !DIAssignID !19
33  call void @llvm.dbg.assign(metadata i32 %a, metadata !12, metadata !DIExpression(), metadata !19, metadata ptr %a.addr, metadata !DIExpression()), !dbg !14
34  %0 = load i32, ptr %a.addr, align 4, !dbg !20
35  %add = add nsw i32 %0, 1, !dbg !20
36  store i32 %add, ptr %a.addr, align 4, !dbg !20, !DIAssignID !21
37  call void @llvm.dbg.assign(metadata i32 %add, metadata !12, metadata !DIExpression(), metadata !21, metadata ptr %a.addr, metadata !DIExpression()), !dbg !14
38  %1 = load i32, ptr %a.addr, align 4, !dbg !22
39  ret i32 %1, !dbg !23
40}
41
42declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
43
44!llvm.dbg.cu = !{!0}
45!llvm.module.flags = !{!2, !3, !4, !5, !1000}
46!llvm.ident = !{!6}
47
48!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 14.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
49!1 = !DIFile(filename: "test.cpp", directory: "/")
50!2 = !{i32 7, !"Dwarf Version", i32 5}
51!3 = !{i32 2, !"Debug Info Version", i32 3}
52!4 = !{i32 1, !"wchar_size", i32 4}
53!5 = !{i32 7, !"uwtable", i32 1}
54!6 = !{!"clang version 14.0.0"}
55!7 = distinct !DISubprogram(name: "f", linkageName: "_Z1fi", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
56!8 = !DISubroutineType(types: !9)
57!9 = !{!10, !10}
58!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
59!11 = !{!12}
60!12 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 1, type: !10)
61!13 = distinct !DIAssignID()
62!14 = !DILocation(line: 0, scope: !7)
63!19 = distinct !DIAssignID()
64!20 = !DILocation(line: 2, column: 5, scope: !7)
65!21 = distinct !DIAssignID()
66!22 = !DILocation(line: 3, column: 10, scope: !7)
67!23 = !DILocation(line: 3, column: 3, scope: !7)
68!24 = !DILocalVariable(name: "b", scope: !7, file: !1, line: 1, type: !10)
69!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
70