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clang-p2996/llvm/test/Transforms/SampleProfile/branch.ll
Dehao Chen 53a0c082d2 Do not set branch weight if the branch weight annotation is present. 
Summary: ThinLTO will annotate the CFG twice. If the branch weight is set by the first annotation, we should not set the branch weight again in the second annotation because the first annotation is more accurate as there is less optimization that could affect debug info accuracy.

Reviewers: tejohnson, davidxl

Reviewed By: tejohnson

Subscribers: mehdi_amini, aprantl, llvm-commits

Differential Revision: https://reviews.llvm.org/D31228

llvm-svn: 298602
2017-03-23 14:43:10 +00:00

243 lines
12 KiB
LLVM
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; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/branch.prof | opt -analyze -branch-prob | FileCheck %s
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/branch.prof | opt -analyze -branch-prob | FileCheck %s
; Original C++ code for this test case:
;
; #include <stdio.h>
; #include <stdlib.h>
; int main(int argc, char *argv[]) {
; if (argc < 2)
; return 1;
; double result;
; int limit = atoi(argv[1]);
; if (limit > 100) {
; double s = 23.041968 * atoi(argv[2]);
; for (int u = 0; u < limit; u++) {
; double x = s;
; s = x + 3.049 + (double)u;
; s -= s + 3.94 / x * 0.32;
; }
; result = s;
; } else {
; result = atoi(argv[2]);
; }
; printf("result is %lf\n", result);
; return 0;
; }
@.str = private unnamed_addr constant [15 x i8] c"result is %lf\0A\00", align 1
; Function Attrs: uwtable
define i32 @main(i32 %argc, i8** %argv) #0 !dbg !6 {
; CHECK: Printing analysis 'Branch Probability Analysis' for function 'main':
entry:
%retval = alloca i32, align 4
%argc.addr = alloca i32, align 4
%argv.addr = alloca i8**, align 8
%result = alloca double, align 8
%limit = alloca i32, align 4
%s = alloca double, align 8
%u = alloca i32, align 4
%x = alloca double, align 8
store i32 0, i32* %retval, align 4
store i32 %argc, i32* %argc.addr, align 4
call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !16, metadata !17), !dbg !18
store i8** %argv, i8*** %argv.addr, align 8
call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !19, metadata !17), !dbg !20
%0 = load i32, i32* %argc.addr, align 4, !dbg !21
%cmp = icmp slt i32 %0, 2, !dbg !23
br i1 %cmp, label %if.then, label %if.end, !dbg !24
; CHECK: edge entry -> if.then probability is 0x4ccf6b16 / 0x80000000 = 60.01%
; CHECK: edge entry -> if.end probability is 0x333094ea / 0x80000000 = 39.99%
if.then: ; preds = %entry
store i32 1, i32* %retval, align 4, !dbg !25
br label %return, !dbg !25
if.end: ; preds = %entry
call void @llvm.dbg.declare(metadata double* %result, metadata !26, metadata !17), !dbg !27
call void @llvm.dbg.declare(metadata i32* %limit, metadata !28, metadata !17), !dbg !29
%1 = load i8**, i8*** %argv.addr, align 8, !dbg !30
%arrayidx = getelementptr inbounds i8*, i8** %1, i64 1, !dbg !30
%2 = load i8*, i8** %arrayidx, align 8, !dbg !30
%call = call i32 @atoi(i8* %2) #4, !dbg !31
store i32 %call, i32* %limit, align 4, !dbg !29
%3 = load i32, i32* %limit, align 4, !dbg !32
%cmp1 = icmp sgt i32 %3, 100, !dbg !34
br i1 %cmp1, label %if.then.2, label %if.else, !dbg !35
; CHECK: edge if.end -> if.then.2 probability is 0x6652c748 / 0x80000000 = 79.94%
; CHECK: edge if.end -> if.else probability is 0x19ad38b8 / 0x80000000 = 20.06%
if.then.2: ; preds = %if.end
call void @llvm.dbg.declare(metadata double* %s, metadata !36, metadata !17), !dbg !38
%4 = load i8**, i8*** %argv.addr, align 8, !dbg !39
%arrayidx3 = getelementptr inbounds i8*, i8** %4, i64 2, !dbg !39
%5 = load i8*, i8** %arrayidx3, align 8, !dbg !39
%call4 = call i32 @atoi(i8* %5) #4, !dbg !40
%conv = sitofp i32 %call4 to double, !dbg !40
%mul = fmul double 0x40370ABE6A337A81, %conv, !dbg !41
store double %mul, double* %s, align 8, !dbg !38
call void @llvm.dbg.declare(metadata i32* %u, metadata !42, metadata !17), !dbg !44
store i32 0, i32* %u, align 4, !dbg !44
br label %for.cond, !dbg !45
for.cond: ; preds = %for.inc, %if.then.2
%6 = load i32, i32* %u, align 4, !dbg !46
%7 = load i32, i32* %limit, align 4, !dbg !48
%cmp5 = icmp slt i32 %6, %7, !dbg !49
br i1 %cmp5, label %for.body, label %for.end, !dbg !50, !prof !80
; CHECK: edge for.cond -> for.body probability is 0x73333333 / 0x80000000 = 90.00%
; CHECK: edge for.cond -> for.end probability is 0x0ccccccd / 0x80000000 = 10.00%
for.body: ; preds = %for.cond
call void @llvm.dbg.declare(metadata double* %x, metadata !51, metadata !17), !dbg !53
%8 = load double, double* %s, align 8, !dbg !54
store double %8, double* %x, align 8, !dbg !53
%9 = load double, double* %x, align 8, !dbg !55
%add = fadd double %9, 3.049000e+00, !dbg !56
%10 = load i32, i32* %u, align 4, !dbg !57
%conv6 = sitofp i32 %10 to double, !dbg !57
%add7 = fadd double %add, %conv6, !dbg !58
store double %add7, double* %s, align 8, !dbg !59
%11 = load double, double* %s, align 8, !dbg !60
%12 = load double, double* %x, align 8, !dbg !61
%div = fdiv double 3.940000e+00, %12, !dbg !62
%mul8 = fmul double %div, 3.200000e-01, !dbg !63
%add9 = fadd double %11, %mul8, !dbg !64
%13 = load double, double* %s, align 8, !dbg !65
%sub = fsub double %13, %add9, !dbg !65
store double %sub, double* %s, align 8, !dbg !65
br label %for.inc, !dbg !66
for.inc: ; preds = %for.body
%14 = load i32, i32* %u, align 4, !dbg !67
%inc = add nsw i32 %14, 1, !dbg !67
store i32 %inc, i32* %u, align 4, !dbg !67
br label %for.cond, !dbg !68
for.end: ; preds = %for.cond
%15 = load double, double* %s, align 8, !dbg !69
store double %15, double* %result, align 8, !dbg !70
br label %if.end.13, !dbg !71
if.else: ; preds = %if.end
%16 = load i8**, i8*** %argv.addr, align 8, !dbg !72
%arrayidx10 = getelementptr inbounds i8*, i8** %16, i64 2, !dbg !72
%17 = load i8*, i8** %arrayidx10, align 8, !dbg !72
%call11 = call i32 @atoi(i8* %17) #4, !dbg !74
%conv12 = sitofp i32 %call11 to double, !dbg !74
store double %conv12, double* %result, align 8, !dbg !75
br label %if.end.13
if.end.13: ; preds = %if.else, %for.end
%18 = load double, double* %result, align 8, !dbg !76
%call14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i32 0, i32 0), double %18), !dbg !77
store i32 0, i32* %retval, align 4, !dbg !78
br label %return, !dbg !78
return: ; preds = %if.end.13, %if.then
%19 = load i32, i32* %retval, align 4, !dbg !79
ret i32 %19, !dbg !79
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: nounwind readonly
declare i32 @atoi(i8*) #2
declare i32 @printf(i8*, ...) #3
attributes #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" }
attributes #1 = { nounwind readnone }
attributes #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" }
attributes #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" }
attributes #4 = { nounwind readonly }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!13, !14}
!llvm.ident = !{!15}
!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)
!1 = !DIFile(filename: "test.cc", directory: "/ssd/llvm_commit")
!2 = !{}
!3 = !{!4}
!4 = !DIBasicType(name: "double", size: 64, align: 64, encoding: DW_ATE_float)
!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, variables: !2)
!7 = !DISubroutineType(types: !8)
!8 = !{!9, !9, !10}
!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64, align: 64)
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64, align: 64)
!12 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
!13 = !{i32 2, !"Dwarf Version", i32 4}
!14 = !{i32 2, !"Debug Info Version", i32 3}
!15 = !{!"clang version 3.8.0 (trunk 248211) (llvm/trunk 248217)"}
!16 = !DILocalVariable(name: "argc", arg: 1, scope: !6, file: !1, line: 4, type: !9)
!17 = !DIExpression()
!18 = !DILocation(line: 4, column: 15, scope: !6)
!19 = !DILocalVariable(name: "argv", arg: 2, scope: !6, file: !1, line: 4, type: !10)
!20 = !DILocation(line: 4, column: 27, scope: !6)
!21 = !DILocation(line: 5, column: 8, scope: !22)
!22 = distinct !DILexicalBlock(scope: !6, file: !1, line: 5, column: 8)
!23 = !DILocation(line: 5, column: 13, scope: !22)
!24 = !DILocation(line: 5, column: 8, scope: !6)
!25 = !DILocation(line: 6, column: 6, scope: !22)
!26 = !DILocalVariable(name: "result", scope: !6, file: !1, line: 7, type: !4)
!27 = !DILocation(line: 7, column: 11, scope: !6)
!28 = !DILocalVariable(name: "limit", scope: !6, file: !1, line: 8, type: !9)
!29 = !DILocation(line: 8, column: 8, scope: !6)
!30 = !DILocation(line: 8, column: 21, scope: !6)
!31 = !DILocation(line: 8, column: 16, scope: !6)
!32 = !DILocation(line: 9, column: 8, scope: !33)
!33 = distinct !DILexicalBlock(scope: !6, file: !1, line: 9, column: 8)
!34 = !DILocation(line: 9, column: 14, scope: !33)
!35 = !DILocation(line: 9, column: 8, scope: !6)
!36 = !DILocalVariable(name: "s", scope: !37, file: !1, line: 10, type: !4)
!37 = distinct !DILexicalBlock(scope: !33, file: !1, line: 9, column: 21)
!38 = !DILocation(line: 10, column: 13, scope: !37)
!39 = !DILocation(line: 10, column: 34, scope: !37)
!40 = !DILocation(line: 10, column: 29, scope: !37)
!41 = !DILocation(line: 10, column: 27, scope: !37)
!42 = !DILocalVariable(name: "u", scope: !43, file: !1, line: 11, type: !9)
!43 = distinct !DILexicalBlock(scope: !37, file: !1, line: 11, column: 6)
!44 = !DILocation(line: 11, column: 15, scope: !43)
!45 = !DILocation(line: 11, column: 11, scope: !43)
!46 = !DILocation(line: 11, column: 22, scope: !47)
!47 = distinct !DILexicalBlock(scope: !43, file: !1, line: 11, column: 6)
!48 = !DILocation(line: 11, column: 26, scope: !47)
!49 = !DILocation(line: 11, column: 24, scope: !47)
!50 = !DILocation(line: 11, column: 6, scope: !43)
!51 = !DILocalVariable(name: "x", scope: !52, file: !1, line: 12, type: !4)
!52 = distinct !DILexicalBlock(scope: !47, file: !1, line: 11, column: 38)
!53 = !DILocation(line: 12, column: 15, scope: !52)
!54 = !DILocation(line: 12, column: 19, scope: !52)
!55 = !DILocation(line: 13, column: 12, scope: !52)
!56 = !DILocation(line: 13, column: 14, scope: !52)
!57 = !DILocation(line: 13, column: 32, scope: !52)
!58 = !DILocation(line: 13, column: 22, scope: !52)
!59 = !DILocation(line: 13, column: 10, scope: !52)
!60 = !DILocation(line: 14, column: 13, scope: !52)
!61 = !DILocation(line: 14, column: 24, scope: !52)
!62 = !DILocation(line: 14, column: 22, scope: !52)
!63 = !DILocation(line: 14, column: 26, scope: !52)
!64 = !DILocation(line: 14, column: 15, scope: !52)
!65 = !DILocation(line: 14, column: 10, scope: !52)
!66 = !DILocation(line: 15, column: 6, scope: !52)
!67 = !DILocation(line: 11, column: 34, scope: !47)
!68 = !DILocation(line: 11, column: 6, scope: !47)
!69 = !DILocation(line: 16, column: 15, scope: !37)
!70 = !DILocation(line: 16, column: 13, scope: !37)
!71 = !DILocation(line: 17, column: 4, scope: !37)
!72 = !DILocation(line: 18, column: 20, scope: !73)
!73 = distinct !DILexicalBlock(scope: !33, file: !1, line: 17, column: 11)
!74 = !DILocation(line: 18, column: 15, scope: !73)
!75 = !DILocation(line: 18, column: 13, scope: !73)
!76 = !DILocation(line: 20, column: 30, scope: !6)
!77 = !DILocation(line: 20, column: 4, scope: !6)
!78 = !DILocation(line: 21, column: 4, scope: !6)
!79 = !DILocation(line: 22, column: 2, scope: !6)
!80 = !{!"branch_weights", i32 90, i32 10}
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