xref: /llvm-project/llvm/test/Transforms/SampleProfile/branch.ll (revision bb6497ffa6a88d1b3a32101d9b6519094d75ef2a) 
1; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/branch.prof | opt -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s
2; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/branch.prof -overwrite-existing-weights=1 | opt -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s  --check-prefix=OVW
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, ptr %argv) #0 !dbg !6 {
33; CHECK: Printing analysis {{.*}} for function 'main':
34
35entry:
36  %retval = alloca i32, align 4
37  %argc.addr = alloca i32, align 4
38  %argv.addr = alloca ptr, 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, ptr %retval, align 4
45  store i32 %argc, ptr %argc.addr, align 4
46  call void @llvm.dbg.declare(metadata ptr %argc.addr, metadata !16, metadata !17), !dbg !18
47  store ptr %argv, ptr %argv.addr, align 8
48  call void @llvm.dbg.declare(metadata ptr %argv.addr, metadata !19, metadata !17), !dbg !20
49  %0 = load i32, ptr %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, ptr %retval, align 4, !dbg !25
57  br label %return, !dbg !25
58
59if.end:                                           ; preds = %entry
60  call void @llvm.dbg.declare(metadata ptr %result, metadata !26, metadata !17), !dbg !27
61  call void @llvm.dbg.declare(metadata ptr %limit, metadata !28, metadata !17), !dbg !29
62  %1 = load ptr, ptr %argv.addr, align 8, !dbg !30
63  %arrayidx = getelementptr inbounds ptr, ptr %1, i64 1, !dbg !30
64  %2 = load ptr, ptr %arrayidx, align 8, !dbg !30
65  %call = call i32 @atoi(ptr %2) #4, !dbg !31
66  store i32 %call, ptr %limit, align 4, !dbg !29
67  %3 = load i32, ptr %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 ptr %s, metadata !36, metadata !17), !dbg !38
75  %4 = load ptr, ptr %argv.addr, align 8, !dbg !39
76  %arrayidx3 = getelementptr inbounds ptr, ptr %4, i64 2, !dbg !39
77  %5 = load ptr, ptr %arrayidx3, align 8, !dbg !39
78  %call4 = call i32 @atoi(ptr %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, ptr %s, align 8, !dbg !38
82  call void @llvm.dbg.declare(metadata ptr %u, metadata !42, metadata !17), !dbg !44
83  store i32 0, ptr %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, ptr %u, align 4, !dbg !46
88  %7 = load i32, ptr %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; OVW: edge %for.cond -> %for.body probability is 0x76b3f3be / 0x80000000 = 92.74%
94; OVW: edge %for.cond -> %for.end probability is 0x094c0c42 / 0x80000000 = 7.26%
95
96for.body:                                         ; preds = %for.cond
97  call void @llvm.dbg.declare(metadata ptr %x, metadata !51, metadata !17), !dbg !53
98  %8 = load double, ptr %s, align 8, !dbg !54
99  store double %8, ptr %x, align 8, !dbg !53
100  %9 = load double, ptr %x, align 8, !dbg !55
101  %add = fadd double %9, 3.049000e+00, !dbg !56
102  %10 = load i32, ptr %u, align 4, !dbg !57
103  %conv6 = sitofp i32 %10 to double, !dbg !57
104  %add7 = fadd double %add, %conv6, !dbg !58
105  store double %add7, ptr %s, align 8, !dbg !59
106  %11 = load double, ptr %s, align 8, !dbg !60
107  %12 = load double, ptr %x, align 8, !dbg !61
108  %div = fdiv double 3.940000e+00, %12, !dbg !62
109  %mul8 = fmul double %div, 3.200000e-01, !dbg !63
110  %add9 = fadd double %11, %mul8, !dbg !64
111  %13 = load double, ptr %s, align 8, !dbg !65
112  %sub = fsub double %13, %add9, !dbg !65
113  store double %sub, ptr %s, align 8, !dbg !65
114  br label %for.inc, !dbg !66
115
116for.inc:                                          ; preds = %for.body
117  %14 = load i32, ptr %u, align 4, !dbg !67
118  %inc = add nsw i32 %14, 1, !dbg !67
119  store i32 %inc, ptr %u, align 4, !dbg !67
120  br label %for.cond, !dbg !68
121
122for.end:                                          ; preds = %for.cond
123  %15 = load double, ptr %s, align 8, !dbg !69
124  store double %15, ptr %result, align 8, !dbg !70
125  br label %if.end.13, !dbg !71
126
127if.else:                                          ; preds = %if.end
128  %16 = load ptr, ptr %argv.addr, align 8, !dbg !72
129  %arrayidx10 = getelementptr inbounds ptr, ptr %16, i64 2, !dbg !72
130  %17 = load ptr, ptr %arrayidx10, align 8, !dbg !72
131  %call11 = call i32 @atoi(ptr %17) #4, !dbg !74
132  %conv12 = sitofp i32 %call11 to double, !dbg !74
133  store double %conv12, ptr %result, align 8, !dbg !75
134  br label %if.end.13
135
136if.end.13:                                        ; preds = %if.else, %for.end
137  %18 = load double, ptr %result, align 8, !dbg !76
138  %call14 = call i32 (ptr, ...) @printf(ptr @.str, double %18), !dbg !77
139  store i32 0, ptr %retval, align 4, !dbg !78
140  br label %return, !dbg !78
141
142return:                                           ; preds = %if.end.13, %if.then
143  %19 = load i32, ptr %retval, align 4, !dbg !79
144  ret i32 %19, !dbg !79
145}
146
147; Function Attrs: nounwind readnone
148declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
149
150; Function Attrs: nounwind readonly
151declare i32 @atoi(ptr) #2
152
153declare i32 @printf(ptr, ...) #3
154
155attributes #0 = { uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "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" "use-sample-profile" }
156attributes #1 = { nounwind readnone }
157attributes #2 = { nounwind readonly "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "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" }
158attributes #3 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "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" }
159attributes #4 = { nounwind readonly }
160
161!llvm.dbg.cu = !{!0}
162!llvm.module.flags = !{!13, !14}
163!llvm.ident = !{!15}
164
165!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)
166!1 = !DIFile(filename: "test.cc", directory: "/ssd/llvm_commit")
167!2 = !{}
168!3 = !{!4}
169!4 = !DIBasicType(name: "double", size: 64, align: 64, encoding: DW_ATE_float)
170!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)
171!7 = !DISubroutineType(types: !8)
172!8 = !{!9, !9, !10}
173!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
174!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64, align: 64)
175!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64, align: 64)
176!12 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
177!13 = !{i32 2, !"Dwarf Version", i32 4}
178!14 = !{i32 2, !"Debug Info Version", i32 3}
179!15 = !{!"clang version 3.8.0 (trunk 248211) (llvm/trunk 248217)"}
180!16 = !DILocalVariable(name: "argc", arg: 1, scope: !6, file: !1, line: 4, type: !9)
181!17 = !DIExpression()
182!18 = !DILocation(line: 4, column: 15, scope: !6)
183!19 = !DILocalVariable(name: "argv", arg: 2, scope: !6, file: !1, line: 4, type: !10)
184!20 = !DILocation(line: 4, column: 27, scope: !6)
185!21 = !DILocation(line: 5, column: 8, scope: !22)
186!22 = distinct !DILexicalBlock(scope: !6, file: !1, line: 5, column: 8)
187!23 = !DILocation(line: 5, column: 13, scope: !22)
188!24 = !DILocation(line: 5, column: 8, scope: !6)
189!25 = !DILocation(line: 6, column: 6, scope: !22)
190!26 = !DILocalVariable(name: "result", scope: !6, file: !1, line: 7, type: !4)
191!27 = !DILocation(line: 7, column: 11, scope: !6)
192!28 = !DILocalVariable(name: "limit", scope: !6, file: !1, line: 8, type: !9)
193!29 = !DILocation(line: 8, column: 8, scope: !6)
194!30 = !DILocation(line: 8, column: 21, scope: !6)
195!31 = !DILocation(line: 8, column: 16, scope: !6)
196!32 = !DILocation(line: 9, column: 8, scope: !33)
197!33 = distinct !DILexicalBlock(scope: !6, file: !1, line: 9, column: 8)
198!34 = !DILocation(line: 9, column: 14, scope: !33)
199!35 = !DILocation(line: 9, column: 8, scope: !6)
200!36 = !DILocalVariable(name: "s", scope: !37, file: !1, line: 10, type: !4)
201!37 = distinct !DILexicalBlock(scope: !33, file: !1, line: 9, column: 21)
202!38 = !DILocation(line: 10, column: 13, scope: !37)
203!39 = !DILocation(line: 10, column: 34, scope: !37)
204!40 = !DILocation(line: 10, column: 29, scope: !37)
205!41 = !DILocation(line: 10, column: 27, scope: !37)
206!42 = !DILocalVariable(name: "u", scope: !43, file: !1, line: 11, type: !9)
207!43 = distinct !DILexicalBlock(scope: !37, file: !1, line: 11, column: 6)
208!44 = !DILocation(line: 11, column: 15, scope: !43)
209!45 = !DILocation(line: 11, column: 11, scope: !43)
210!46 = !DILocation(line: 11, column: 22, scope: !47)
211!47 = distinct !DILexicalBlock(scope: !43, file: !1, line: 11, column: 6)
212!48 = !DILocation(line: 11, column: 26, scope: !47)
213!49 = !DILocation(line: 11, column: 24, scope: !47)
214!50 = !DILocation(line: 11, column: 6, scope: !43)
215!51 = !DILocalVariable(name: "x", scope: !52, file: !1, line: 12, type: !4)
216!52 = distinct !DILexicalBlock(scope: !47, file: !1, line: 11, column: 38)
217!53 = !DILocation(line: 12, column: 15, scope: !52)
218!54 = !DILocation(line: 12, column: 19, scope: !52)
219!55 = !DILocation(line: 13, column: 12, scope: !52)
220!56 = !DILocation(line: 13, column: 14, scope: !52)
221!57 = !DILocation(line: 13, column: 32, scope: !52)
222!58 = !DILocation(line: 13, column: 22, scope: !52)
223!59 = !DILocation(line: 13, column: 10, scope: !52)
224!60 = !DILocation(line: 14, column: 13, scope: !52)
225!61 = !DILocation(line: 14, column: 24, scope: !52)
226!62 = !DILocation(line: 14, column: 22, scope: !52)
227!63 = !DILocation(line: 14, column: 26, scope: !52)
228!64 = !DILocation(line: 14, column: 15, scope: !52)
229!65 = !DILocation(line: 14, column: 10, scope: !52)
230!66 = !DILocation(line: 15, column: 6, scope: !52)
231!67 = !DILocation(line: 11, column: 34, scope: !47)
232!68 = !DILocation(line: 11, column: 6, scope: !47)
233!69 = !DILocation(line: 16, column: 15, scope: !37)
234!70 = !DILocation(line: 16, column: 13, scope: !37)
235!71 = !DILocation(line: 17, column: 4, scope: !37)
236!72 = !DILocation(line: 18, column: 20, scope: !73)
237!73 = distinct !DILexicalBlock(scope: !33, file: !1, line: 17, column: 11)
238!74 = !DILocation(line: 18, column: 15, scope: !73)
239!75 = !DILocation(line: 18, column: 13, scope: !73)
240!76 = !DILocation(line: 20, column: 30, scope: !6)
241!77 = !DILocation(line: 20, column: 4, scope: !6)
242!78 = !DILocation(line: 21, column: 4, scope: !6)
243!79 = !DILocation(line: 22, column: 2, scope: !6)
244!80 = !{!"branch_weights", i32 90, i32 10}
245