1; RUN: llc -start-after=codegenprepare -stop-before finalize-isel -o - %s | FileCheck %s
2
3; This test case was generated from the following debug.c program,
4; using: clang debug.c -g -O1 -S -o dbg_value_phi_isel1.ll -emit-llvm
5; --------------------------------------
6; int end = 10;
7;
8; int main() {
9;   int x = 9;
10;   int y = 13;
11;   for (int u = 0; u < end; ++u) {
12;     x += y;
13;     y = y * 3;
14;   }
15;
16;   volatile int arr[80];
17;   for (int q = 0; q < 64; ++q) {
18;     arr[q] = q + 3;
19;   }
20;
21;   return x;
22; }
23; --------------------------------------
24;
25
26; ModuleID = 'debug.c'
27source_filename = "debug.c"
28target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
29target triple = "x86_64-unknown-linux-gnu"
30
31@end = dso_local local_unnamed_addr global i32 10, align 4, !dbg !0
32
33; Function Attrs: nounwind uwtable
34define dso_local i32 @main() local_unnamed_addr #0 !dbg !11 {
35; CHECK-LABEL: name:            main
36entry:
37  %arr = alloca [80 x i32], align 16
38  call void @llvm.dbg.value(metadata i32 9, metadata !15, metadata !DIExpression()), !dbg !26
39  call void @llvm.dbg.value(metadata i32 13, metadata !16, metadata !DIExpression()), !dbg !27
40  call void @llvm.dbg.value(metadata i32 0, metadata !17, metadata !DIExpression()), !dbg !28
41  %0 = load i32, i32* @end, align 4, !dbg !29, !tbaa !31
42  %cmp20 = icmp sgt i32 %0, 0, !dbg !35
43  br i1 %cmp20, label %for.body.lr.ph, label %for.cond.cleanup, !dbg !36
44
45for.body.lr.ph:                                   ; preds = %entry
46  %1 = load i32, i32* @end, align 4, !tbaa !31
47  br label %for.body, !dbg !36
48
49for.cond.cleanup:                                 ; preds = %for.body, %entry
50; CHECK-LABEL: bb.{{.*}}.for.cond.cleanup:
51; CHECK:      [[REG1:%[0-9]+]]:gr32 = PHI
52; CHECK-NEXT: DBG_VALUE [[REG1]]
53  %x.0.lcssa = phi i32 [ 9, %entry ], [ %add, %for.body ]
54  call void @llvm.dbg.value(metadata i32 %x.0.lcssa, metadata !15, metadata !DIExpression()), !dbg !26
55  %2 = bitcast [80 x i32]* %arr to i8*, !dbg !37
56  call void @llvm.lifetime.start.p0i8(i64 320, i8* nonnull %2) #3, !dbg !37
57  call void @llvm.dbg.declare(metadata [80 x i32]* %arr, metadata !19, metadata !DIExpression()), !dbg !38
58  call void @llvm.dbg.value(metadata i32 0, metadata !24, metadata !DIExpression()), !dbg !39
59  br label %for.body4, !dbg !40
60
61for.body:                                         ; preds = %for.body.lr.ph, %for.body
62; CHECK-LABEL: bb.{{.*}}.for.body:
63; CHECK:      [[REG2:%[0-9]+]]:gr32 = PHI
64; CHECK-NEXT: [[REG3:%[0-9]+]]:gr32 = PHI
65; CHECK-NEXT: [[REG4:%[0-9]+]]:gr32 = PHI
66; CHECK-NEXT: DBG_VALUE [[REG2]]
67; CHECK-NEXT: DBG_VALUE [[REG3]]
68; CHECK-NEXT: DBG_VALUE [[REG4]]
69  %u.023 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
70  %y.022 = phi i32 [ 13, %for.body.lr.ph ], [ %mul, %for.body ]
71  %x.021 = phi i32 [ 9, %for.body.lr.ph ], [ %add, %for.body ]
72  call void @llvm.dbg.value(metadata i32 %u.023, metadata !17, metadata !DIExpression()), !dbg !28
73  call void @llvm.dbg.value(metadata i32 %y.022, metadata !16, metadata !DIExpression()), !dbg !27
74  call void @llvm.dbg.value(metadata i32 %x.021, metadata !15, metadata !DIExpression()), !dbg !26
75  %add = add nuw nsw i32 %y.022, %x.021, !dbg !41
76  %mul = mul nsw i32 %y.022, 3, !dbg !43
77  %inc = add nuw nsw i32 %u.023, 1, !dbg !44
78  call void @llvm.dbg.value(metadata i32 %inc, metadata !17, metadata !DIExpression()), !dbg !28
79  call void @llvm.dbg.value(metadata i32 %mul, metadata !16, metadata !DIExpression()), !dbg !27
80  call void @llvm.dbg.value(metadata i32 %add, metadata !15, metadata !DIExpression()), !dbg !26
81  %cmp = icmp slt i32 %inc, %1, !dbg !35
82  br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !36, !llvm.loop !45
83
84for.cond.cleanup3:                                ; preds = %for.body4
85  call void @llvm.lifetime.end.p0i8(i64 320, i8* nonnull %2) #3, !dbg !47
86  ret i32 %x.0.lcssa, !dbg !48
87
88for.body4:                                        ; preds = %for.body4, %for.cond.cleanup
89  %indvars.iv = phi i64 [ 0, %for.cond.cleanup ], [ %indvars.iv.next, %for.body4 ]
90  call void @llvm.dbg.value(metadata i64 %indvars.iv, metadata !24, metadata !DIExpression()), !dbg !39
91  %arrayidx = getelementptr inbounds [80 x i32], [80 x i32]* %arr, i64 0, i64 %indvars.iv, !dbg !49
92  %3 = trunc i64 %indvars.iv to i32, !dbg !52
93  %4 = add i32 %3, 3, !dbg !52
94  store volatile i32 %4, i32* %arrayidx, align 4, !dbg !52, !tbaa !31
95  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !53
96  call void @llvm.dbg.value(metadata i32 undef, metadata !24, metadata !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value)), !dbg !39
97  %exitcond = icmp eq i64 %indvars.iv.next, 64, !dbg !54
98  br i1 %exitcond, label %for.cond.cleanup3, label %for.body4, !dbg !40, !llvm.loop !55
99}
100
101; Function Attrs: argmemonly nounwind
102declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
103
104; Function Attrs: nounwind readnone speculatable
105declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
106
107; Function Attrs: argmemonly nounwind
108declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
109
110; Function Attrs: nounwind readnone speculatable
111declare void @llvm.dbg.value(metadata, metadata, metadata) #2
112
113attributes #0 = { nounwind uwtable }
114attributes #1 = { argmemonly nounwind }
115attributes #2 = { nounwind readnone speculatable }
116attributes #3 = { nounwind }
117
118!llvm.dbg.cu = !{!2}
119!llvm.module.flags = !{!7, !8, !9}
120!llvm.ident = !{!10}
121
122!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
123!1 = distinct !DIGlobalVariable(name: "end", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
124!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 7.0.0 (x)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
125!3 = !DIFile(filename: "debug.c", directory: "")
126!4 = !{}
127!5 = !{!0}
128!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
129!7 = !{i32 2, !"Dwarf Version", i32 4}
130!8 = !{i32 2, !"Debug Info Version", i32 3}
131!9 = !{i32 1, !"wchar_size", i32 4}
132!10 = !{!"clang version 7.0.0 (x)"}
133!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)
134!12 = !DISubroutineType(types: !13)
135!13 = !{!6}
136!14 = !{!15, !16, !17, !19, !24}
137!15 = !DILocalVariable(name: "x", scope: !11, file: !3, line: 4, type: !6)
138!16 = !DILocalVariable(name: "y", scope: !11, file: !3, line: 5, type: !6)
139!17 = !DILocalVariable(name: "u", scope: !18, file: !3, line: 6, type: !6)
140!18 = distinct !DILexicalBlock(scope: !11, file: !3, line: 6, column: 3)
141!19 = !DILocalVariable(name: "arr", scope: !11, file: !3, line: 11, type: !20)
142!20 = !DICompositeType(tag: DW_TAG_array_type, baseType: !21, size: 2560, elements: !22)
143!21 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !6)
144!22 = !{!23}
145!23 = !DISubrange(count: 80)
146!24 = !DILocalVariable(name: "q", scope: !25, file: !3, line: 12, type: !6)
147!25 = distinct !DILexicalBlock(scope: !11, file: !3, line: 12, column: 3)
148!26 = !DILocation(line: 4, column: 7, scope: !11)
149!27 = !DILocation(line: 5, column: 7, scope: !11)
150!28 = !DILocation(line: 6, column: 12, scope: !18)
151!29 = !DILocation(line: 6, column: 23, scope: !30)
152!30 = distinct !DILexicalBlock(scope: !18, file: !3, line: 6, column: 3)
153!31 = !{!32, !32, i64 0}
154!32 = !{!"int", !33, i64 0}
155!33 = !{!"omnipotent char", !34, i64 0}
156!34 = !{!"Simple C/C++ TBAA"}
157!35 = !DILocation(line: 6, column: 21, scope: !30)
158!36 = !DILocation(line: 6, column: 3, scope: !18)
159!37 = !DILocation(line: 11, column: 3, scope: !11)
160!38 = !DILocation(line: 11, column: 16, scope: !11)
161!39 = !DILocation(line: 12, column: 12, scope: !25)
162!40 = !DILocation(line: 12, column: 3, scope: !25)
163!41 = !DILocation(line: 7, column: 7, scope: !42)
164!42 = distinct !DILexicalBlock(scope: !30, file: !3, line: 6, column: 33)
165!43 = !DILocation(line: 8, column: 11, scope: !42)
166!44 = !DILocation(line: 6, column: 28, scope: !30)
167!45 = distinct !{!45, !36, !46}
168!46 = !DILocation(line: 9, column: 3, scope: !18)
169!47 = !DILocation(line: 17, column: 1, scope: !11)
170!48 = !DILocation(line: 16, column: 3, scope: !11)
171!49 = !DILocation(line: 13, column: 5, scope: !50)
172!50 = distinct !DILexicalBlock(scope: !51, file: !3, line: 12, column: 32)
173!51 = distinct !DILexicalBlock(scope: !25, file: !3, line: 12, column: 3)
174!52 = !DILocation(line: 13, column: 12, scope: !50)
175!53 = !DILocation(line: 12, column: 27, scope: !51)
176!54 = !DILocation(line: 12, column: 21, scope: !51)
177!55 = distinct !{!55, !40, !56}
178!56 = !DILocation(line: 14, column: 3, scope: !25)
179