1 ; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/branch.prof | opt -analyze -branch-prob | FileCheck %s 2 3 ; Original C++ code for this test case: 4 ; 5 ; #include <stdio.h> 6 ; #include <stdlib.h> 7 ; 8 ; int main(int argc, char *argv[]) { 9 ; if (argc < 2) 10 ; return 1; 11 ; double result; 12 ; int limit = atoi(argv[1]); 13 ; if (limit > 100) { 14 ; double s = 23.041968; 15 ; for (int u = 0; u < limit; u++) { 16 ; double x = s; 17 ; s = x + 3.049 + (double)u; 18 ; s -= s + 3.94 / x * 0.32; 19 ; } 20 ; result = s; 21 ; } else { 22 ; result = 0; 23 ; } 24 ; printf("result is %lf\n", result); 25 ; return 0; 26 ; } 27 28 @.str = private unnamed_addr constant [15 x i8] c"result is %lf\0A\00", align 1 29 30 ; Function Attrs: nounwind uwtable 31 define i32 @main(i32 %argc, i8** nocapture readonly %argv) #0 { 32 ; CHECK: Printing analysis 'Branch Probability Analysis' for function 'main': 33 34 entry: 35 tail call void @llvm.dbg.value(metadata i32 %argc, i64 0, metadata !13, metadata !MDExpression()), !dbg !27 36 tail call void @llvm.dbg.value(metadata i8** %argv, i64 0, metadata !14, metadata !MDExpression()), !dbg !27 37 %cmp = icmp slt i32 %argc, 2, !dbg !28 38 br i1 %cmp, label %return, label %if.end, !dbg !28 39 ; CHECK: edge entry -> return probability is 1 / 2 = 50% 40 ; CHECK: edge entry -> if.end probability is 1 / 2 = 50% 41 42 if.end: ; preds = %entry 43 %arrayidx = getelementptr inbounds i8*, i8** %argv, i64 1, !dbg !30 44 %0 = load i8*, i8** %arrayidx, align 8, !dbg !30, !tbaa !31 45 %call = tail call i32 @atoi(i8* %0) #4, !dbg !30 46 tail call void @llvm.dbg.value(metadata i32 %call, i64 0, metadata !17, metadata !MDExpression()), !dbg !30 47 %cmp1 = icmp sgt i32 %call, 100, !dbg !35 48 br i1 %cmp1, label %for.body, label %if.end6, !dbg !35 49 ; CHECK: edge if.end -> for.body probability is 1 / 2 = 50% 50 ; CHECK: edge if.end -> if.end6 probability is 1 / 2 = 50% 51 52 for.body: ; preds = %if.end, %for.body 53 %u.016 = phi i32 [ %inc, %for.body ], [ 0, %if.end ] 54 %s.015 = phi double [ %sub, %for.body ], [ 0x40370ABE6A337A81, %if.end ] 55 %add = fadd double %s.015, 3.049000e+00, !dbg !36 56 %conv = sitofp i32 %u.016 to double, !dbg !36 57 %add4 = fadd double %add, %conv, !dbg !36 58 tail call void @llvm.dbg.value(metadata double %add4, i64 0, metadata !18, metadata !MDExpression()), !dbg !36 59 %div = fdiv double 3.940000e+00, %s.015, !dbg !37 60 %mul = fmul double %div, 3.200000e-01, !dbg !37 61 %add5 = fadd double %add4, %mul, !dbg !37 62 %sub = fsub double %add4, %add5, !dbg !37 63 tail call void @llvm.dbg.value(metadata double %sub, i64 0, metadata !18, metadata !MDExpression()), !dbg !37 64 %inc = add nsw i32 %u.016, 1, !dbg !38 65 tail call void @llvm.dbg.value(metadata i32 %inc, i64 0, metadata !21, metadata !MDExpression()), !dbg !38 66 %exitcond = icmp eq i32 %inc, %call, !dbg !38 67 br i1 %exitcond, label %if.end6, label %for.body, !dbg !38 68 ; CHECK: edge for.body -> if.end6 probability is 1 / 10227 = 0.00977804 69 ; CHECK: edge for.body -> for.body probability is 10226 / 10227 = 99.9902% [HOT edge] 70 71 if.end6: ; preds = %for.body, %if.end 72 %result.0 = phi double [ 0.000000e+00, %if.end ], [ %sub, %for.body ] 73 %call7 = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), double %result.0), !dbg !39 74 br label %return, !dbg !40 75 ; CHECK: edge if.end6 -> return probability is 16 / 16 = 100% [HOT edge] 76 77 return: ; preds = %entry, %if.end6 78 %retval.0 = phi i32 [ 0, %if.end6 ], [ 1, %entry ] 79 ret i32 %retval.0, !dbg !41 80 } 81 82 ; Function Attrs: nounwind readonly 83 declare i32 @atoi(i8* nocapture) #1 84 85 ; Function Attrs: nounwind 86 declare i32 @printf(i8* nocapture readonly, ...) #2 87 88 ; Function Attrs: nounwind readnone 89 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3 90 91 attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 92 attributes #1 = { nounwind readonly "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 93 attributes #2 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 94 attributes #3 = { nounwind readnone } 95 attributes #4 = { nounwind readonly } 96 97 !llvm.dbg.cu = !{!0} 98 !llvm.module.flags = !{!25, !42} 99 !llvm.ident = !{!26} 100 101 !0 = !MDCompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 (trunk 192896) (llvm/trunk 192895)", isOptimized: true, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2) 102 !1 = !MDFile(filename: "branch.cc", directory: ".") 103 !2 = !{} 104 !3 = !{!4} 105 !4 = !MDSubprogram(name: "main", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 4, file: !1, scope: !5, type: !6, function: i32 (i32, i8**)* @main, variables: !12) 106 !5 = !MDFile(filename: "branch.cc", directory: ".") 107 !6 = !MDSubroutineType(types: !7) 108 !7 = !{!8, !8, !9} 109 !8 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 110 !9 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !10) 111 !10 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !11) 112 !11 = !MDBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char) 113 !12 = !{!13, !14, !15, !17, !18, !21, !23} 114 !13 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "argc", line: 4, arg: 1, scope: !4, file: !5, type: !8) 115 !14 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "argv", line: 4, arg: 2, scope: !4, file: !5, type: !9) 116 !15 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "result", line: 7, scope: !4, file: !5, type: !16) 117 !16 = !MDBasicType(tag: DW_TAG_base_type, name: "double", size: 64, align: 64, encoding: DW_ATE_float) 118 !17 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "limit", line: 8, scope: !4, file: !5, type: !8) 119 !18 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "s", line: 10, scope: !19, file: !5, type: !16) 120 !19 = distinct !MDLexicalBlock(line: 9, column: 0, file: !1, scope: !20) 121 !20 = distinct !MDLexicalBlock(line: 9, column: 0, file: !1, scope: !4) 122 !21 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "u", line: 11, scope: !22, file: !5, type: !8) 123 !22 = distinct !MDLexicalBlock(line: 11, column: 0, file: !1, scope: !19) 124 !23 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "x", line: 12, scope: !24, file: !5, type: !16) 125 !24 = distinct !MDLexicalBlock(line: 11, column: 0, file: !1, scope: !22) 126 !25 = !{i32 2, !"Dwarf Version", i32 4} 127 !26 = !{!"clang version 3.4 (trunk 192896) (llvm/trunk 192895)"} 128 !27 = !MDLocation(line: 4, scope: !4) 129 !28 = !MDLocation(line: 5, scope: !29) 130 !29 = distinct !MDLexicalBlock(line: 5, column: 0, file: !1, scope: !4) 131 !30 = !MDLocation(line: 8, scope: !4) 132 !31 = !{!32, !32, i64 0} 133 !32 = !{!"any pointer", !33, i64 0} 134 !33 = !{!"omnipotent char", !34, i64 0} 135 !34 = !{!"Simple C/C++ TBAA"} 136 !35 = !MDLocation(line: 9, scope: !20) 137 !36 = !MDLocation(line: 13, scope: !24) 138 !37 = !MDLocation(line: 14, scope: !24) 139 !38 = !MDLocation(line: 11, scope: !22) 140 !39 = !MDLocation(line: 20, scope: !4) 141 !40 = !MDLocation(line: 21, scope: !4) 142 !41 = !MDLocation(line: 22, scope: !4) 143 !42 = !{i32 1, !"Debug Info Version", i32 3} 144
