1; FIXME: use -stop-after when MIR serialization output includes needed debug info.
2; RUN: llc < %s -print-after=wasm-reg-stackify 2>&1 | FileCheck %s
3
4; CHECK: {{.*}}After WebAssembly Register Stackify
5; CHECK: bb.3.for.body.for.body_crit_edge:
6; CHECK: [[REG:%[0-9]+]]:i32 = nsw ADD_I32 {{.*}} fib.c:7:7
7; CHECK-NEXT: DBG_VALUE [[REG]]:i32, $noreg, !"a", {{.*}} fib.c:5:13
8
9; ModuleID = 'fib.bc'
10; The test generated via: clang --target=wasm32-unknown-unknown-wasm fib.c -g -O2
11; All lifetime markers and attributes were removed.
12source_filename = "fib.c"
13; void swap(int* a, int* b);
14;
15; __attribute__ ((visibility ("default")))
16; int fib(int n) {
17;   int i, t, a = 0, b = 1;
18;   for (i = 0; i < n; i++) {
19;     a += b;
20;     swap(&a, &b);
21;   }
22;   return b;
23; }
24target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
25target triple = "wasm32-unknown-unknown-wasm"
26
27; Function Attrs: nounwind
28define i32 @fib(i32 %n) local_unnamed_addr #0 !dbg !7 {
29entry:
30  %a = alloca i32, align 4
31  %b = alloca i32, align 4
32  call void @llvm.dbg.value(metadata i32 %n, metadata !12, metadata !DIExpression()), !dbg !17
33  %0 = bitcast i32* %a to i8*, !dbg !18
34  call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !19
35  store i32 0, i32* %a, align 4, !dbg !19, !tbaa !20
36  %1 = bitcast i32* %b to i8*, !dbg !18
37  call void @llvm.dbg.value(metadata i32 1, metadata !16, metadata !DIExpression()), !dbg !24
38  store i32 1, i32* %b, align 4, !dbg !24, !tbaa !20
39  call void @llvm.dbg.value(metadata i32 0, metadata !13, metadata !DIExpression()), !dbg !25
40  %cmp4 = icmp sgt i32 %n, 0, !dbg !26
41  call void @llvm.dbg.value(metadata i32 1, metadata !16, metadata !DIExpression()), !dbg !24
42  br i1 %cmp4, label %for.body.preheader, label %for.end, !dbg !29
43
44for.body.preheader:                               ; preds = %entry
45  call void @llvm.dbg.value(metadata i32 0, metadata !13, metadata !DIExpression()), !dbg !25
46  call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !19
47  call void @llvm.dbg.value(metadata i32 1, metadata !15, metadata !DIExpression()), !dbg !19
48  store i32 1, i32* %a, align 4, !dbg !30, !tbaa !20
49  call void @llvm.dbg.value(metadata i32* %a, metadata !15, metadata !DIExpression()), !dbg !19
50  call void @llvm.dbg.value(metadata i32* %b, metadata !16, metadata !DIExpression()), !dbg !24
51  call void @swap(i32* nonnull %a, i32* nonnull %b) #5, !dbg !32
52  call void @llvm.dbg.value(metadata i32 1, metadata !13, metadata !DIExpression()), !dbg !25
53  %2 = load i32, i32* %b, align 4, !dbg !33, !tbaa !20
54  call void @llvm.dbg.value(metadata i32 %2, metadata !16, metadata !DIExpression()), !dbg !24
55  %exitcond9 = icmp eq i32 %n, 1, !dbg !26
56  br i1 %exitcond9, label %for.end, label %for.body.for.body_crit_edge, !dbg !29, !llvm.loop !34
57
58for.body.for.body_crit_edge:                      ; preds = %for.body.preheader, %for.body.for.body_crit_edge
59  %3 = phi i32 [ %4, %for.body.for.body_crit_edge ], [ %2, %for.body.preheader ]
60  %inc10 = phi i32 [ %inc, %for.body.for.body_crit_edge ], [ 1, %for.body.preheader ]
61  %.pre = load i32, i32* %a, align 4, !dbg !30, !tbaa !20
62  call void @llvm.dbg.value(metadata i32 %inc10, metadata !13, metadata !DIExpression()), !dbg !25
63  call void @llvm.dbg.value(metadata i32 %.pre, metadata !15, metadata !DIExpression()), !dbg !19
64  %add = add nsw i32 %.pre, %3, !dbg !30
65  call void @llvm.dbg.value(metadata i32 %add, metadata !15, metadata !DIExpression()), !dbg !19
66  store i32 %add, i32* %a, align 4, !dbg !30, !tbaa !20
67  call void @llvm.dbg.value(metadata i32* %a, metadata !15, metadata !DIExpression()), !dbg !19
68  call void @llvm.dbg.value(metadata i32* %b, metadata !16, metadata !DIExpression()), !dbg !24
69  call void @swap(i32* nonnull %a, i32* nonnull %b) #5, !dbg !32
70  %inc = add nuw nsw i32 %inc10, 1, !dbg !36
71  call void @llvm.dbg.value(metadata i32 %inc, metadata !13, metadata !DIExpression()), !dbg !25
72  %4 = load i32, i32* %b, align 4, !dbg !33, !tbaa !20
73  call void @llvm.dbg.value(metadata i32 %4, metadata !16, metadata !DIExpression()), !dbg !24
74  %exitcond = icmp eq i32 %inc, %n, !dbg !26
75  br i1 %exitcond, label %for.end, label %for.body.for.body_crit_edge, !dbg !29, !llvm.loop !34
76
77for.end:                                          ; preds = %for.body.for.body_crit_edge, %for.body.preheader, %entry
78  %.lcssa = phi i32 [ 1, %entry ], [ %2, %for.body.preheader ], [ %4, %for.body.for.body_crit_edge ]
79  ret i32 %.lcssa, !dbg !38
80}
81
82declare void @swap(i32*, i32*) local_unnamed_addr #2
83
84; Function Attrs: nounwind readnone speculatable
85declare void @llvm.dbg.value(metadata, metadata, metadata) #4
86
87!llvm.dbg.cu = !{!0}
88!llvm.module.flags = !{!3, !4, !5}
89!llvm.ident = !{!6}
90
91!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 7.0.0 (trunk 334610)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
92!1 = !DIFile(filename: "fib.c", directory: "/d/y/llvmwasm")
93!2 = !{}
94!3 = !{i32 2, !"Dwarf Version", i32 4}
95!4 = !{i32 2, !"Debug Info Version", i32 3}
96!5 = !{i32 1, !"wchar_size", i32 4}
97!6 = !{!"clang version 7.0.0 (trunk 334610)"}
98!7 = distinct !DISubprogram(name: "fib", scope: !1, file: !1, line: 4, type: !8, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
99!8 = !DISubroutineType(types: !9)
100!9 = !{!10, !10}
101!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
102!11 = !{!12, !13, !14, !15, !16}
103!12 = !DILocalVariable(name: "n", arg: 1, scope: !7, file: !1, line: 4, type: !10)
104!13 = !DILocalVariable(name: "i", scope: !7, file: !1, line: 5, type: !10)
105!14 = !DILocalVariable(name: "t", scope: !7, file: !1, line: 5, type: !10)
106!15 = !DILocalVariable(name: "a", scope: !7, file: !1, line: 5, type: !10)
107!16 = !DILocalVariable(name: "b", scope: !7, file: !1, line: 5, type: !10)
108!17 = !DILocation(line: 4, column: 13, scope: !7)
109!18 = !DILocation(line: 5, column: 3, scope: !7)
110!19 = !DILocation(line: 5, column: 13, scope: !7)
111!20 = !{!21, !21, i64 0}
112!21 = !{!"int", !22, i64 0}
113!22 = !{!"omnipotent char", !23, i64 0}
114!23 = !{!"Simple C/C++ TBAA"}
115!24 = !DILocation(line: 5, column: 20, scope: !7)
116!25 = !DILocation(line: 5, column: 7, scope: !7)
117!26 = !DILocation(line: 6, column: 17, scope: !27)
118!27 = distinct !DILexicalBlock(scope: !28, file: !1, line: 6, column: 3)
119!28 = distinct !DILexicalBlock(scope: !7, file: !1, line: 6, column: 3)
120!29 = !DILocation(line: 6, column: 3, scope: !28)
121!30 = !DILocation(line: 7, column: 7, scope: !31)
122!31 = distinct !DILexicalBlock(scope: !27, file: !1, line: 6, column: 27)
123!32 = !DILocation(line: 8, column: 5, scope: !31)
124!33 = !DILocation(line: 0, scope: !7)
125!34 = distinct !{!34, !29, !35}
126!35 = !DILocation(line: 9, column: 3, scope: !28)
127!36 = !DILocation(line: 6, column: 23, scope: !27)
128!37 = !DILocation(line: 11, column: 1, scope: !7)
129!38 = !DILocation(line: 10, column: 3, scope: !7)
130!39 = distinct !DISubprogram(name: "_start", scope: !1, file: !1, line: 13, type: !40, isLocal: false, isDefinition: true, scopeLine: 13, isOptimized: true, unit: !0, retainedNodes: !2)
131!40 = !DISubroutineType(types: !41)
132!41 = !{null}
133!42 = !DILocation(line: 13, column: 16, scope: !39)
134