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llvm-mirror/test/Transforms/SampleProfile/propagate.ll
Shiva Chen a2029fa58e [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 
In order to set breakpoints on labels and list source code around
labels, we need collect debug information for labels, i.e., label
name, the function label belong, line number in the file, and the
address label located. In order to keep these information in LLVM
IR and to allow backend to generate debug information correctly.
We create a new kind of metadata for labels, DILabel. The format
of DILabel is

!DILabel(scope: !1, name: "foo", file: !2, line: 3)

We hope to keep debug information as much as possible even the
code is optimized. So, we create a new kind of intrinsic for label
metadata to avoid the metadata is eliminated with basic block.
The intrinsic will keep existing if we keep it from optimized out.
The format of the intrinsic is

llvm.dbg.label(metadata !1)

It has only one argument, that is the DILabel metadata. The
intrinsic will follow the label immediately. Backend could get the
label metadata through the intrinsic's parameter.

We also create DIBuilder API for labels to be used by Frontend.
Frontend could use createLabel() to allocate DILabel objects, and use
insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR.

Differential Revision: https://reviews.llvm.org/D45024

Patch by Hsiangkai Wang.

llvm-svn: 331841
2018-05-09 02:40:45 +00:00

318 lines
15 KiB
LLVM
Raw Blame History

; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/propagate.prof | opt -analyze -branch-prob | FileCheck %s
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/propagate.prof | opt -analyze -branch-prob | FileCheck %s
; Original C++ code for this test case:
;
; #include <stdio.h>
;
; long foo(int x, int y, long N) {
; if (x < y) {
; return y - x;
; } else {
; for (long i = 0; i < N; i++) {
; if (i > N / 3)
; x--;
; if (i > N / 4) {
; y++;
; x += 3;
; } else {
; for (unsigned j = 0; j < 100; j++) {
; x += j;
; y -= 3;
; }
; }
; }
; }
; return y * x;
; }
;
; int main() {
; int x = 5678;
; int y = 1234;
; long N = 9999999;
; printf("foo(%d, %d, %ld) = %ld\n", x, y, N, foo(x, y, N));
; return 0;
; }
; ModuleID = 'propagate.cc'
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@.str = private unnamed_addr constant [24 x i8] c"foo(%d, %d, %ld) = %ld\0A\00", align 1
; Function Attrs: nounwind uwtable
define i64 @_Z3fooiil(i32 %x, i32 %y, i64 %N) #0 !dbg !6 {
entry:
%retval = alloca i64, align 8
%x.addr = alloca i32, align 4
%y.addr = alloca i32, align 4
%N.addr = alloca i64, align 8
%i = alloca i64, align 8
%j = alloca i64, align 8
store i32 %x, i32* %x.addr, align 4
call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !11, metadata !12), !dbg !13
store i32 %y, i32* %y.addr, align 4
call void @llvm.dbg.declare(metadata i32* %y.addr, metadata !14, metadata !12), !dbg !15
store i64 %N, i64* %N.addr, align 8
call void @llvm.dbg.declare(metadata i64* %N.addr, metadata !16, metadata !12), !dbg !17
%0 = load i32, i32* %x.addr, align 4, !dbg !18
%1 = load i32, i32* %y.addr, align 4, !dbg !20
%cmp = icmp slt i32 %0, %1, !dbg !21
br i1 %cmp, label %if.then, label %if.else, !dbg !22
if.then: ; preds = %entry
%2 = load i32, i32* %y.addr, align 4, !dbg !23
%3 = load i32, i32* %x.addr, align 4, !dbg !25
%sub = sub nsw i32 %2, %3, !dbg !26
%conv = sext i32 %sub to i64, !dbg !23
store i64 %conv, i64* %retval, align 8, !dbg !27
br label %return, !dbg !27
if.else: ; preds = %entry
call void @llvm.dbg.declare(metadata i64* %i, metadata !28, metadata !12), !dbg !31
store i64 0, i64* %i, align 8, !dbg !31
br label %for.cond, !dbg !32
for.cond: ; preds = %for.inc17, %if.else
%4 = load i64, i64* %i, align 8, !dbg !33
%5 = load i64, i64* %N.addr, align 8, !dbg !36
%cmp1 = icmp slt i64 %4, %5, !dbg !37
br i1 %cmp1, label %for.body, label %for.end19, !dbg !38
for.body: ; preds = %for.cond
%6 = load i64, i64* %i, align 8, !dbg !39
%7 = load i64, i64* %N.addr, align 8, !dbg !42
%div = sdiv i64 %7, 3, !dbg !43
%cmp2 = icmp sgt i64 %6, %div, !dbg !44
br i1 %cmp2, label %if.then3, label %if.end, !dbg !45
; CHECK: edge for.body -> if.then3 probability is 0x51292fa6 / 0x80000000 = 63.41%
; CHECK: edge for.body -> if.end probability is 0x2ed6d05a / 0x80000000 = 36.59%
if.then3: ; preds = %for.body
%8 = load i32, i32* %x.addr, align 4, !dbg !46
%dec = add nsw i32 %8, -1, !dbg !46
store i32 %dec, i32* %x.addr, align 4, !dbg !46
br label %if.end, !dbg !47
if.end: ; preds = %if.then3, %for.body
%9 = load i64, i64* %i, align 8, !dbg !48
%10 = load i64, i64* %N.addr, align 8, !dbg !50
%div4 = sdiv i64 %10, 4, !dbg !51
%cmp5 = icmp sgt i64 %9, %div4, !dbg !52
br i1 %cmp5, label %if.then6, label %if.else7, !dbg !53
; CHECK: edge if.end -> if.then6 probability is 0x5d89d89e / 0x80000000 = 73.08%
; CHECK: edge if.end -> if.else7 probability is 0x22762762 / 0x80000000 = 26.92%
if.then6: ; preds = %if.end
%11 = load i32, i32* %y.addr, align 4, !dbg !54
%inc = add nsw i32 %11, 1, !dbg !54
store i32 %inc, i32* %y.addr, align 4, !dbg !54
%12 = load i32, i32* %x.addr, align 4, !dbg !56
%add = add nsw i32 %12, 3, !dbg !56
store i32 %add, i32* %x.addr, align 4, !dbg !56
br label %if.end16, !dbg !57
if.else7: ; preds = %if.end
call void @llvm.dbg.declare(metadata i64* %j, metadata !58, metadata !12), !dbg !62
store i64 0, i64* %j, align 8, !dbg !62
br label %for.cond8, !dbg !63
for.cond8: ; preds = %for.inc, %if.else7
%13 = load i64, i64* %j, align 8, !dbg !64
%cmp9 = icmp slt i64 %13, 100, !dbg !67
br i1 %cmp9, label %for.body10, label %for.end, !dbg !68
; CHECK: edge for.cond8 -> for.body10 probability is 0x7e941a89 / 0x80000000 = 98.89% [HOT edge]
; CHECK: edge for.cond8 -> for.end probability is 0x016be577 / 0x80000000 = 1.11%
for.body10: ; preds = %for.cond8
%14 = load i64, i64* %j, align 8, !dbg !69
%15 = load i32, i32* %x.addr, align 4, !dbg !71
%conv11 = sext i32 %15 to i64, !dbg !71
%add12 = add nsw i64 %conv11, %14, !dbg !71
%conv13 = trunc i64 %add12 to i32, !dbg !71
store i32 %conv13, i32* %x.addr, align 4, !dbg !71
%16 = load i32, i32* %y.addr, align 4, !dbg !72
%sub14 = sub nsw i32 %16, 3, !dbg !72
store i32 %sub14, i32* %y.addr, align 4, !dbg !72
br label %for.inc, !dbg !73
for.inc: ; preds = %for.body10
%17 = load i64, i64* %j, align 8, !dbg !74
%inc15 = add nsw i64 %17, 1, !dbg !74
store i64 %inc15, i64* %j, align 8, !dbg !74
br label %for.cond8, !dbg !76
for.end: ; preds = %for.cond8
br label %if.end16
if.end16: ; preds = %for.end, %if.then6
br label %for.inc17, !dbg !77
for.inc17: ; preds = %if.end16
%18 = load i64, i64* %i, align 8, !dbg !78
%inc18 = add nsw i64 %18, 1, !dbg !78
store i64 %inc18, i64* %i, align 8, !dbg !78
br label %for.cond, !dbg !80
for.end19: ; preds = %for.cond
br label %if.end20
if.end20: ; preds = %for.end19
%19 = load i32, i32* %y.addr, align 4, !dbg !81
%20 = load i32, i32* %x.addr, align 4, !dbg !82
%mul = mul nsw i32 %19, %20, !dbg !83
%conv21 = sext i32 %mul to i64, !dbg !81
store i64 %conv21, i64* %retval, align 8, !dbg !84
br label %return, !dbg !84
return: ; preds = %if.end20, %if.then
%21 = load i64, i64* %retval, align 8, !dbg !85
ret i64 %21, !dbg !85
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: norecurse uwtable
define i32 @main() #2 !dbg !86 {
entry:
%retval = alloca i32, align 4
%x = alloca i32, align 4
%y = alloca i32, align 4
%N = alloca i64, align 8
store i32 0, i32* %retval, align 4
call void @llvm.dbg.declare(metadata i32* %x, metadata !89, metadata !12), !dbg !90
store i32 5678, i32* %x, align 4, !dbg !90
call void @llvm.dbg.declare(metadata i32* %y, metadata !91, metadata !12), !dbg !92
store i32 1234, i32* %y, align 4, !dbg !92
call void @llvm.dbg.declare(metadata i64* %N, metadata !93, metadata !12), !dbg !94
store i64 9999999, i64* %N, align 8, !dbg !94
%0 = load i32, i32* %x, align 4, !dbg !95
%1 = load i32, i32* %y, align 4, !dbg !96
%2 = load i64, i64* %N, align 8, !dbg !97
%3 = load i32, i32* %x, align 4, !dbg !98
%4 = load i32, i32* %y, align 4, !dbg !99
%5 = load i64, i64* %N, align 8, !dbg !100
%call = call i64 @_Z3fooiil(i32 %3, i32 %4, i64 %5), !dbg !101
%call1 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str, i32 0, i32 0), i32 %0, i32 %1, i64 %2, i64 %call), !dbg !102
ret i32 0, !dbg !104
}
declare i32 @printf(i8*, ...) #3
attributes #0 = { nounwind 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-jump-tables"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }
attributes #2 = { norecurse 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-jump-tables"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "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"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!llvm.ident = !{!5}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.0 (trunk 266819)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "propagate.cc", directory: ".")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{!"clang version 3.9.0 (trunk 266819)"}
!6 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooiil", scope: !1, file: !1, line: 3, type: !7, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
!7 = !DISubroutineType(types: !8)
!8 = !{!9, !10, !10, !9}
!9 = !DIBasicType(name: "long int", size: 64, align: 64, encoding: DW_ATE_signed)
!10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!11 = !DILocalVariable(name: "x", arg: 1, scope: !6, file: !1, line: 3, type: !10)
!12 = !DIExpression()
!13 = !DILocation(line: 3, column: 14, scope: !6)
!14 = !DILocalVariable(name: "y", arg: 2, scope: !6, file: !1, line: 3, type: !10)
!15 = !DILocation(line: 3, column: 21, scope: !6)
!16 = !DILocalVariable(name: "N", arg: 3, scope: !6, file: !1, line: 3, type: !9)
!17 = !DILocation(line: 3, column: 29, scope: !6)
!18 = !DILocation(line: 4, column: 7, scope: !19)
!19 = distinct !DILexicalBlock(scope: !6, file: !1, line: 4, column: 7)
!20 = !DILocation(line: 4, column: 11, scope: !19)
!21 = !DILocation(line: 4, column: 9, scope: !19)
!22 = !DILocation(line: 4, column: 7, scope: !6)
!23 = !DILocation(line: 5, column: 12, scope: !24)
!24 = distinct !DILexicalBlock(scope: !19, file: !1, line: 4, column: 14)
!25 = !DILocation(line: 5, column: 16, scope: !24)
!26 = !DILocation(line: 5, column: 14, scope: !24)
!27 = !DILocation(line: 5, column: 5, scope: !24)
!28 = !DILocalVariable(name: "i", scope: !29, file: !1, line: 7, type: !9)
!29 = distinct !DILexicalBlock(scope: !30, file: !1, line: 7, column: 5)
!30 = distinct !DILexicalBlock(scope: !19, file: !1, line: 6, column: 10)
!31 = !DILocation(line: 7, column: 15, scope: !29)
!32 = !DILocation(line: 7, column: 10, scope: !29)
!33 = !DILocation(line: 7, column: 22, scope: !34)
!34 = !DILexicalBlockFile(scope: !35, file: !1, discriminator: 2)
!35 = distinct !DILexicalBlock(scope: !29, file: !1, line: 7, column: 5)
!36 = !DILocation(line: 7, column: 26, scope: !34)
!37 = !DILocation(line: 7, column: 24, scope: !34)
!38 = !DILocation(line: 7, column: 5, scope: !34)
!39 = !DILocation(line: 8, column: 11, scope: !40)
!40 = distinct !DILexicalBlock(scope: !41, file: !1, line: 8, column: 11)
!41 = distinct !DILexicalBlock(scope: !35, file: !1, line: 7, column: 34)
!42 = !DILocation(line: 8, column: 15, scope: !40)
!43 = !DILocation(line: 8, column: 17, scope: !40)
!44 = !DILocation(line: 8, column: 13, scope: !40)
!45 = !DILocation(line: 8, column: 11, scope: !41)
!46 = !DILocation(line: 9, column: 10, scope: !40)
!47 = !DILocation(line: 9, column: 9, scope: !40)
!48 = !DILocation(line: 10, column: 11, scope: !49)
!49 = distinct !DILexicalBlock(scope: !41, file: !1, line: 10, column: 11)
!50 = !DILocation(line: 10, column: 15, scope: !49)
!51 = !DILocation(line: 10, column: 17, scope: !49)
!52 = !DILocation(line: 10, column: 13, scope: !49)
!53 = !DILocation(line: 10, column: 11, scope: !41)
!54 = !DILocation(line: 11, column: 10, scope: !55)
!55 = distinct !DILexicalBlock(scope: !49, file: !1, line: 10, column: 22)
!56 = !DILocation(line: 12, column: 11, scope: !55)
!57 = !DILocation(line: 13, column: 7, scope: !55)
!58 = !DILocalVariable(name: "j", scope: !59, file: !1, line: 14, type: !61)
!59 = distinct !DILexicalBlock(scope: !60, file: !1, line: 14, column: 9)
!60 = distinct !DILexicalBlock(scope: !49, file: !1, line: 13, column: 14)
!61 = !DIBasicType(name: "long long int", size: 64, align: 64, encoding: DW_ATE_signed)
!62 = !DILocation(line: 14, column: 24, scope: !59)
!63 = !DILocation(line: 14, column: 14, scope: !59)
!64 = !DILocation(line: 14, column: 31, scope: !65)
!65 = !DILexicalBlockFile(scope: !66, file: !1, discriminator: 2)
!66 = distinct !DILexicalBlock(scope: !59, file: !1, line: 14, column: 9)
!67 = !DILocation(line: 14, column: 33, scope: !65)
!68 = !DILocation(line: 14, column: 9, scope: !65)
!69 = !DILocation(line: 15, column: 16, scope: !70)
!70 = distinct !DILexicalBlock(scope: !66, file: !1, line: 14, column: 45)
!71 = !DILocation(line: 15, column: 13, scope: !70)
!72 = !DILocation(line: 16, column: 13, scope: !70)
!73 = !DILocation(line: 17, column: 9, scope: !70)
!74 = !DILocation(line: 14, column: 41, scope: !75)
!75 = !DILexicalBlockFile(scope: !66, file: !1, discriminator: 4)
!76 = !DILocation(line: 14, column: 9, scope: !75)
!77 = !DILocation(line: 19, column: 5, scope: !41)
!78 = !DILocation(line: 7, column: 30, scope: !79)
!79 = !DILexicalBlockFile(scope: !35, file: !1, discriminator: 4)
!80 = !DILocation(line: 7, column: 5, scope: !79)
!81 = !DILocation(line: 21, column: 10, scope: !6)
!82 = !DILocation(line: 21, column: 14, scope: !6)
!83 = !DILocation(line: 21, column: 12, scope: !6)
!84 = !DILocation(line: 21, column: 3, scope: !6)
!85 = !DILocation(line: 22, column: 1, scope: !6)
!86 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 24, type: !87, isLocal: false, isDefinition: true, scopeLine: 24, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
!87 = !DISubroutineType(types: !88)
!88 = !{!10}
!89 = !DILocalVariable(name: "x", scope: !86, file: !1, line: 25, type: !10)
!90 = !DILocation(line: 25, column: 7, scope: !86)
!91 = !DILocalVariable(name: "y", scope: !86, file: !1, line: 26, type: !10)
!92 = !DILocation(line: 26, column: 7, scope: !86)
!93 = !DILocalVariable(name: "N", scope: !86, file: !1, line: 27, type: !9)
!94 = !DILocation(line: 27, column: 8, scope: !86)
!95 = !DILocation(line: 28, column: 38, scope: !86)
!96 = !DILocation(line: 28, column: 41, scope: !86)
!97 = !DILocation(line: 28, column: 44, scope: !86)
!98 = !DILocation(line: 28, column: 51, scope: !86)
!99 = !DILocation(line: 28, column: 54, scope: !86)
!100 = !DILocation(line: 28, column: 57, scope: !86)
!101 = !DILocation(line: 28, column: 47, scope: !86)
!102 = !DILocation(line: 28, column: 3, scope: !103)
!103 = !DILexicalBlockFile(scope: !86, file: !1, discriminator: 2)
!104 = !DILocation(line: 29, column: 3, scope: !86)
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