1; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/branch.prof | opt -analyze -branch-prob | FileCheck %s
2; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/branch.prof | opt -analyze -branch-prob | FileCheck %s
3
4; Original C++ code for this test case:
5;
6; #include <stdio.h>
7; #include <stdlib.h>
8
9; int main(int argc, char *argv[]) {
10;   if (argc < 2)
11;     return 1;
12;   double result;
13;   int limit = atoi(argv[1]);
14;   if (limit > 100) {
15;     double s = 23.041968 * atoi(argv[2]);
16;     for (int u = 0; u < limit; u++) {
17;       double x = s;
18;       s = x + 3.049 + (double)u;
19;       s -= s + 3.94 / x * 0.32;
20;     }
21;     result = s;
22;   } else {
23;     result = atoi(argv[2]);
24;   }
25;   printf("result is %lf\n", result);
26;   return 0;
27; }
28
29@.str = private unnamed_addr constant [15 x i8] c"result is %lf\0A\00", align 1
30
31; Function Attrs: uwtable
32define i32 @main(i32 %argc, i8** %argv) #0 !dbg !6 {
33; CHECK: Printing analysis 'Branch Probability Analysis' for function 'main':
34
35entry:
36  %retval = alloca i32, align 4
37  %argc.addr = alloca i32, align 4
38  %argv.addr = alloca i8**, align 8
39  %result = alloca double, align 8
40  %limit = alloca i32, align 4
41  %s = alloca double, align 8
42  %u = alloca i32, align 4
43  %x = alloca double, align 8
44  store i32 0, i32* %retval, align 4
45  store i32 %argc, i32* %argc.addr, align 4
46  call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !16, metadata !17), !dbg !18
47  store i8** %argv, i8*** %argv.addr, align 8
48  call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !19, metadata !17), !dbg !20
49  %0 = load i32, i32* %argc.addr, align 4, !dbg !21
50  %cmp = icmp slt i32 %0, 2, !dbg !23
51  br i1 %cmp, label %if.then, label %if.end, !dbg !24
52; CHECK:  edge entry -> if.then probability is 0x4ccf6b16 / 0x80000000 = 60.01%
53; CHECK:  edge entry -> if.end probability is 0x333094ea / 0x80000000 = 39.99%
54
55if.then:                                          ; preds = %entry
56  store i32 1, i32* %retval, align 4, !dbg !25
57  br label %return, !dbg !25
58
59if.end:                                           ; preds = %entry
60  call void @llvm.dbg.declare(metadata double* %result, metadata !26, metadata !17), !dbg !27
61  call void @llvm.dbg.declare(metadata i32* %limit, metadata !28, metadata !17), !dbg !29
62  %1 = load i8**, i8*** %argv.addr, align 8, !dbg !30
63  %arrayidx = getelementptr inbounds i8*, i8** %1, i64 1, !dbg !30
64  %2 = load i8*, i8** %arrayidx, align 8, !dbg !30
65  %call = call i32 @atoi(i8* %2) #4, !dbg !31
66  store i32 %call, i32* %limit, align 4, !dbg !29
67  %3 = load i32, i32* %limit, align 4, !dbg !32
68  %cmp1 = icmp sgt i32 %3, 100, !dbg !34
69  br i1 %cmp1, label %if.then.2, label %if.else, !dbg !35
70; CHECK: edge if.end -> if.then.2 probability is 0x6652c748 / 0x80000000 = 79.94%
71; CHECK: edge if.end -> if.else probability is 0x19ad38b8 / 0x80000000 = 20.06%
72
73if.then.2:                                        ; preds = %if.end
74  call void @llvm.dbg.declare(metadata double* %s, metadata !36, metadata !17), !dbg !38
75  %4 = load i8**, i8*** %argv.addr, align 8, !dbg !39
76  %arrayidx3 = getelementptr inbounds i8*, i8** %4, i64 2, !dbg !39
77  %5 = load i8*, i8** %arrayidx3, align 8, !dbg !39
78  %call4 = call i32 @atoi(i8* %5) #4, !dbg !40
79  %conv = sitofp i32 %call4 to double, !dbg !40
80  %mul = fmul double 0x40370ABE6A337A81, %conv, !dbg !41
81  store double %mul, double* %s, align 8, !dbg !38
82  call void @llvm.dbg.declare(metadata i32* %u, metadata !42, metadata !17), !dbg !44
83  store i32 0, i32* %u, align 4, !dbg !44
84  br label %for.cond, !dbg !45
85
86for.cond:                                         ; preds = %for.inc, %if.then.2
87  %6 = load i32, i32* %u, align 4, !dbg !46
88  %7 = load i32, i32* %limit, align 4, !dbg !48
89  %cmp5 = icmp slt i32 %6, %7, !dbg !49
90  br i1 %cmp5, label %for.body, label %for.end, !dbg !50, !prof !80
91; CHECK: edge for.cond -> for.body probability is 0x73333333 / 0x80000000 = 90.00%
92; CHECK: edge for.cond -> for.end probability is 0x0ccccccd / 0x80000000 = 10.00%
93
94for.body:                                         ; preds = %for.cond
95  call void @llvm.dbg.declare(metadata double* %x, metadata !51, metadata !17), !dbg !53
96  %8 = load double, double* %s, align 8, !dbg !54
97  store double %8, double* %x, align 8, !dbg !53
98  %9 = load double, double* %x, align 8, !dbg !55
99  %add = fadd double %9, 3.049000e+00, !dbg !56
100  %10 = load i32, i32* %u, align 4, !dbg !57
101  %conv6 = sitofp i32 %10 to double, !dbg !57
102  %add7 = fadd double %add, %conv6, !dbg !58
103  store double %add7, double* %s, align 8, !dbg !59
104  %11 = load double, double* %s, align 8, !dbg !60
105  %12 = load double, double* %x, align 8, !dbg !61
106  %div = fdiv double 3.940000e+00, %12, !dbg !62
107  %mul8 = fmul double %div, 3.200000e-01, !dbg !63
108  %add9 = fadd double %11, %mul8, !dbg !64
109  %13 = load double, double* %s, align 8, !dbg !65
110  %sub = fsub double %13, %add9, !dbg !65
111  store double %sub, double* %s, align 8, !dbg !65
112  br label %for.inc, !dbg !66
113
114for.inc:                                          ; preds = %for.body
115  %14 = load i32, i32* %u, align 4, !dbg !67
116  %inc = add nsw i32 %14, 1, !dbg !67
117  store i32 %inc, i32* %u, align 4, !dbg !67
118  br label %for.cond, !dbg !68
119
120for.end:                                          ; preds = %for.cond
121  %15 = load double, double* %s, align 8, !dbg !69
122  store double %15, double* %result, align 8, !dbg !70
123  br label %if.end.13, !dbg !71
124
125if.else:                                          ; preds = %if.end
126  %16 = load i8**, i8*** %argv.addr, align 8, !dbg !72
127  %arrayidx10 = getelementptr inbounds i8*, i8** %16, i64 2, !dbg !72
128  %17 = load i8*, i8** %arrayidx10, align 8, !dbg !72
129  %call11 = call i32 @atoi(i8* %17) #4, !dbg !74
130  %conv12 = sitofp i32 %call11 to double, !dbg !74
131  store double %conv12, double* %result, align 8, !dbg !75
132  br label %if.end.13
133
134if.end.13:                                        ; preds = %if.else, %for.end
135  %18 = load double, double* %result, align 8, !dbg !76
136  %call14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i32 0, i32 0), double %18), !dbg !77
137  store i32 0, i32* %retval, align 4, !dbg !78
138  br label %return, !dbg !78
139
140return:                                           ; preds = %if.end.13, %if.then
141  %19 = load i32, i32* %retval, align 4, !dbg !79
142  ret i32 %19, !dbg !79
143}
144
145; Function Attrs: nounwind readnone
146declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
147
148; Function Attrs: nounwind readonly
149declare i32 @atoi(i8*) #2
150
151declare i32 @printf(i8*, ...) #3
152
153attributes #0 = { uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
154attributes #1 = { nounwind readnone }
155attributes #2 = { nounwind readonly "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
156attributes #3 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
157attributes #4 = { nounwind readonly }
158
159!llvm.dbg.cu = !{!0}
160!llvm.module.flags = !{!13, !14}
161!llvm.ident = !{!15}
162
163!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 248211) (llvm/trunk 248217)", isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug, enums: !2, retainedTypes: !3)
164!1 = !DIFile(filename: "test.cc", directory: "/ssd/llvm_commit")
165!2 = !{}
166!3 = !{!4}
167!4 = !DIBasicType(name: "double", size: 64, align: 64, encoding: DW_ATE_float)
168!6 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 4, type: !7, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
169!7 = !DISubroutineType(types: !8)
170!8 = !{!9, !9, !10}
171!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
172!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64, align: 64)
173!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64, align: 64)
174!12 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
175!13 = !{i32 2, !"Dwarf Version", i32 4}
176!14 = !{i32 2, !"Debug Info Version", i32 3}
177!15 = !{!"clang version 3.8.0 (trunk 248211) (llvm/trunk 248217)"}
178!16 = !DILocalVariable(name: "argc", arg: 1, scope: !6, file: !1, line: 4, type: !9)
179!17 = !DIExpression()
180!18 = !DILocation(line: 4, column: 15, scope: !6)
181!19 = !DILocalVariable(name: "argv", arg: 2, scope: !6, file: !1, line: 4, type: !10)
182!20 = !DILocation(line: 4, column: 27, scope: !6)
183!21 = !DILocation(line: 5, column: 8, scope: !22)
184!22 = distinct !DILexicalBlock(scope: !6, file: !1, line: 5, column: 8)
185!23 = !DILocation(line: 5, column: 13, scope: !22)
186!24 = !DILocation(line: 5, column: 8, scope: !6)
187!25 = !DILocation(line: 6, column: 6, scope: !22)
188!26 = !DILocalVariable(name: "result", scope: !6, file: !1, line: 7, type: !4)
189!27 = !DILocation(line: 7, column: 11, scope: !6)
190!28 = !DILocalVariable(name: "limit", scope: !6, file: !1, line: 8, type: !9)
191!29 = !DILocation(line: 8, column: 8, scope: !6)
192!30 = !DILocation(line: 8, column: 21, scope: !6)
193!31 = !DILocation(line: 8, column: 16, scope: !6)
194!32 = !DILocation(line: 9, column: 8, scope: !33)
195!33 = distinct !DILexicalBlock(scope: !6, file: !1, line: 9, column: 8)
196!34 = !DILocation(line: 9, column: 14, scope: !33)
197!35 = !DILocation(line: 9, column: 8, scope: !6)
198!36 = !DILocalVariable(name: "s", scope: !37, file: !1, line: 10, type: !4)
199!37 = distinct !DILexicalBlock(scope: !33, file: !1, line: 9, column: 21)
200!38 = !DILocation(line: 10, column: 13, scope: !37)
201!39 = !DILocation(line: 10, column: 34, scope: !37)
202!40 = !DILocation(line: 10, column: 29, scope: !37)
203!41 = !DILocation(line: 10, column: 27, scope: !37)
204!42 = !DILocalVariable(name: "u", scope: !43, file: !1, line: 11, type: !9)
205!43 = distinct !DILexicalBlock(scope: !37, file: !1, line: 11, column: 6)
206!44 = !DILocation(line: 11, column: 15, scope: !43)
207!45 = !DILocation(line: 11, column: 11, scope: !43)
208!46 = !DILocation(line: 11, column: 22, scope: !47)
209!47 = distinct !DILexicalBlock(scope: !43, file: !1, line: 11, column: 6)
210!48 = !DILocation(line: 11, column: 26, scope: !47)
211!49 = !DILocation(line: 11, column: 24, scope: !47)
212!50 = !DILocation(line: 11, column: 6, scope: !43)
213!51 = !DILocalVariable(name: "x", scope: !52, file: !1, line: 12, type: !4)
214!52 = distinct !DILexicalBlock(scope: !47, file: !1, line: 11, column: 38)
215!53 = !DILocation(line: 12, column: 15, scope: !52)
216!54 = !DILocation(line: 12, column: 19, scope: !52)
217!55 = !DILocation(line: 13, column: 12, scope: !52)
218!56 = !DILocation(line: 13, column: 14, scope: !52)
219!57 = !DILocation(line: 13, column: 32, scope: !52)
220!58 = !DILocation(line: 13, column: 22, scope: !52)
221!59 = !DILocation(line: 13, column: 10, scope: !52)
222!60 = !DILocation(line: 14, column: 13, scope: !52)
223!61 = !DILocation(line: 14, column: 24, scope: !52)
224!62 = !DILocation(line: 14, column: 22, scope: !52)
225!63 = !DILocation(line: 14, column: 26, scope: !52)
226!64 = !DILocation(line: 14, column: 15, scope: !52)
227!65 = !DILocation(line: 14, column: 10, scope: !52)
228!66 = !DILocation(line: 15, column: 6, scope: !52)
229!67 = !DILocation(line: 11, column: 34, scope: !47)
230!68 = !DILocation(line: 11, column: 6, scope: !47)
231!69 = !DILocation(line: 16, column: 15, scope: !37)
232!70 = !DILocation(line: 16, column: 13, scope: !37)
233!71 = !DILocation(line: 17, column: 4, scope: !37)
234!72 = !DILocation(line: 18, column: 20, scope: !73)
235!73 = distinct !DILexicalBlock(scope: !33, file: !1, line: 17, column: 11)
236!74 = !DILocation(line: 18, column: 15, scope: !73)
237!75 = !DILocation(line: 18, column: 13, scope: !73)
238!76 = !DILocation(line: 20, column: 30, scope: !6)
239!77 = !DILocation(line: 20, column: 4, scope: !6)
240!78 = !DILocation(line: 21, column: 4, scope: !6)
241!79 = !DILocation(line: 22, column: 2, scope: !6)
242!80 = !{!"branch_weights", i32 90, i32 10}
243