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