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|
; RUN: opt < %s -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 < i; j++) {
; x += j;
; y -= 3;
; }
; }
; }
; }
; return y * x;
; }
;
; int main() {
; int x = 5678;
; int y = 1234;
; long N = 999999;
; printf("foo(%d, %d, %ld) = %ld\n", x, y, N, foo(x, y, N));
; return 0;
; }
; ModuleID = 'propagate.cc'
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-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 {
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 i32, align 4
store i32 %x, i32* %x.addr, align 4
store i32 %y, i32* %y.addr, align 4
store i64 %N, i64* %N.addr, align 8
%0 = load i32, i32* %x.addr, align 4, !dbg !11
%1 = load i32, i32* %y.addr, align 4, !dbg !11
%cmp = icmp slt i32 %0, %1, !dbg !11
br i1 %cmp, label %if.then, label %if.else, !dbg !11
if.then: ; preds = %entry
%2 = load i32, i32* %y.addr, align 4, !dbg !13
%3 = load i32, i32* %x.addr, align 4, !dbg !13
%sub = sub nsw i32 %2, %3, !dbg !13
%conv = sext i32 %sub to i64, !dbg !13
store i64 %conv, i64* %retval, !dbg !13
br label %return, !dbg !13
if.else: ; preds = %entry
store i64 0, i64* %i, align 8, !dbg !15
br label %for.cond, !dbg !15
for.cond: ; preds = %for.inc16, %if.else
%4 = load i64, i64* %i, align 8, !dbg !15
%5 = load i64, i64* %N.addr, align 8, !dbg !15
%cmp1 = icmp slt i64 %4, %5, !dbg !15
br i1 %cmp1, label %for.body, label %for.end18, !dbg !15
; CHECK: edge for.cond -> for.body probability is 10 / 11 = 90.9091% [HOT edge]
; CHECK: edge for.cond -> for.end18 probability is 1 / 11 = 9.09091%
for.body: ; preds = %for.cond
%6 = load i64, i64* %i, align 8, !dbg !18
%7 = load i64, i64* %N.addr, align 8, !dbg !18
%div = sdiv i64 %7, 3, !dbg !18
%cmp2 = icmp sgt i64 %6, %div, !dbg !18
br i1 %cmp2, label %if.then3, label %if.end, !dbg !18
; CHECK: edge for.body -> if.then3 probability is 1 / 5 = 20%
; CHECK: edge for.body -> if.end probability is 4 / 5 = 80%
if.then3: ; preds = %for.body
%8 = load i32, i32* %x.addr, align 4, !dbg !21
%dec = add nsw i32 %8, -1, !dbg !21
store i32 %dec, i32* %x.addr, align 4, !dbg !21
br label %if.end, !dbg !21
if.end: ; preds = %if.then3, %for.body
%9 = load i64, i64* %i, align 8, !dbg !22
%10 = load i64, i64* %N.addr, align 8, !dbg !22
%div4 = sdiv i64 %10, 4, !dbg !22
%cmp5 = icmp sgt i64 %9, %div4, !dbg !22
br i1 %cmp5, label %if.then6, label %if.else7, !dbg !22
; CHECK: edge if.end -> if.then6 probability is 3 / 6342 = 0.0473037%
; CHECK: edge if.end -> if.else7 probability is 6339 / 6342 = 99.9527% [HOT edge]
if.then6: ; preds = %if.end
%11 = load i32, i32* %y.addr, align 4, !dbg !24
%inc = add nsw i32 %11, 1, !dbg !24
store i32 %inc, i32* %y.addr, align 4, !dbg !24
%12 = load i32, i32* %x.addr, align 4, !dbg !26
%add = add nsw i32 %12, 3, !dbg !26
store i32 %add, i32* %x.addr, align 4, !dbg !26
br label %if.end15, !dbg !27
if.else7: ; preds = %if.end
store i32 0, i32* %j, align 4, !dbg !28
br label %for.cond8, !dbg !28
for.cond8: ; preds = %for.inc, %if.else7
%13 = load i32, i32* %j, align 4, !dbg !28
%conv9 = zext i32 %13 to i64, !dbg !28
%14 = load i64, i64* %i, align 8, !dbg !28
%cmp10 = icmp slt i64 %conv9, %14, !dbg !28
br i1 %cmp10, label %for.body11, label %for.end, !dbg !28
; CHECK: edge for.cond8 -> for.body11 probability is 16191 / 16192 = 99.9938% [HOT edge]
; CHECK: edge for.cond8 -> for.end probability is 1 / 16192 = 0.00617589%
for.body11: ; preds = %for.cond8
%15 = load i32, i32* %j, align 4, !dbg !31
%16 = load i32, i32* %x.addr, align 4, !dbg !31
%add12 = add i32 %16, %15, !dbg !31
store i32 %add12, i32* %x.addr, align 4, !dbg !31
%17 = load i32, i32* %y.addr, align 4, !dbg !33
%sub13 = sub nsw i32 %17, 3, !dbg !33
store i32 %sub13, i32* %y.addr, align 4, !dbg !33
br label %for.inc, !dbg !34
for.inc: ; preds = %for.body11
%18 = load i32, i32* %j, align 4, !dbg !28
%inc14 = add i32 %18, 1, !dbg !28
store i32 %inc14, i32* %j, align 4, !dbg !28
br label %for.cond8, !dbg !28
for.end: ; preds = %for.cond8
br label %if.end15
if.end15: ; preds = %for.end, %if.then6
br label %for.inc16, !dbg !35
for.inc16: ; preds = %if.end15
%19 = load i64, i64* %i, align 8, !dbg !15
%inc17 = add nsw i64 %19, 1, !dbg !15
store i64 %inc17, i64* %i, align 8, !dbg !15
br label %for.cond, !dbg !15
for.end18: ; preds = %for.cond
br label %if.end19
if.end19: ; preds = %for.end18
%20 = load i32, i32* %y.addr, align 4, !dbg !36
%21 = load i32, i32* %x.addr, align 4, !dbg !36
%mul = mul nsw i32 %20, %21, !dbg !36
%conv20 = sext i32 %mul to i64, !dbg !36
store i64 %conv20, i64* %retval, !dbg !36
br label %return, !dbg !36
return: ; preds = %if.end19, %if.then
%22 = load i64, i64* %retval, !dbg !37
ret i64 %22, !dbg !37
}
; Function Attrs: uwtable
define i32 @main() #1 {
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
store i32 5678, i32* %x, align 4, !dbg !38
store i32 1234, i32* %y, align 4, !dbg !39
store i64 999999, i64* %N, align 8, !dbg !40
%0 = load i32, i32* %x, align 4, !dbg !41
%1 = load i32, i32* %y, align 4, !dbg !41
%2 = load i64, i64* %N, align 8, !dbg !41
%3 = load i32, i32* %x, align 4, !dbg !41
%4 = load i32, i32* %y, align 4, !dbg !41
%5 = load i64, i64* %N, align 8, !dbg !41
%call = call i64 @_Z3fooiil(i32 %3, i32 %4, i64 %5), !dbg !41
%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 !41
ret i32 0, !dbg !42
}
declare i32 @printf(i8*, ...) #2
attributes #0 = { nounwind uwtable "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" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { uwtable "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" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { "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" "unsafe-fp-math"="false" "use-soft-float"="false" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!8, !9}
!llvm.ident = !{!10}
!0 = !MDCompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
!1 = !MDFile(filename: "propagate.cc", directory: ".")
!2 = !{}
!3 = !{!4, !7}
!4 = !MDSubprogram(name: "foo", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !1, scope: !5, type: !6, function: i64 (i32, i32, i64)* @_Z3fooiil, variables: !2)
!5 = !MDFile(filename: "propagate.cc", directory: ".")
!6 = !MDSubroutineType(types: !{null})
!7 = !MDSubprogram(name: "main", line: 24, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 24, file: !1, scope: !5, type: !6, function: i32 ()* @main, variables: !2)
!8 = !{i32 2, !"Dwarf Version", i32 4}
!9 = !{i32 1, !"Debug Info Version", i32 3}
!10 = !{!"clang version 3.5 "}
!11 = !MDLocation(line: 4, scope: !12)
!12 = distinct !MDLexicalBlock(line: 4, column: 0, file: !1, scope: !4)
!13 = !MDLocation(line: 5, scope: !14)
!14 = distinct !MDLexicalBlock(line: 4, column: 0, file: !1, scope: !12)
!15 = !MDLocation(line: 7, scope: !16)
!16 = distinct !MDLexicalBlock(line: 7, column: 0, file: !1, scope: !17)
!17 = distinct !MDLexicalBlock(line: 6, column: 0, file: !1, scope: !12)
!18 = !MDLocation(line: 8, scope: !19)
!19 = distinct !MDLexicalBlock(line: 8, column: 0, file: !1, scope: !20)
!20 = distinct !MDLexicalBlock(line: 7, column: 0, file: !1, scope: !16)
!21 = !MDLocation(line: 9, scope: !19)
!22 = !MDLocation(line: 10, scope: !23)
!23 = distinct !MDLexicalBlock(line: 10, column: 0, file: !1, scope: !20)
!24 = !MDLocation(line: 11, scope: !25)
!25 = distinct !MDLexicalBlock(line: 10, column: 0, file: !1, scope: !23)
!26 = !MDLocation(line: 12, scope: !25)
!27 = !MDLocation(line: 13, scope: !25)
!28 = !MDLocation(line: 14, scope: !29)
!29 = distinct !MDLexicalBlock(line: 14, column: 0, file: !1, scope: !30)
!30 = distinct !MDLexicalBlock(line: 13, column: 0, file: !1, scope: !23)
!31 = !MDLocation(line: 15, scope: !32)
!32 = distinct !MDLexicalBlock(line: 14, column: 0, file: !1, scope: !29)
!33 = !MDLocation(line: 16, scope: !32)
!34 = !MDLocation(line: 17, scope: !32)
!35 = !MDLocation(line: 19, scope: !20)
!36 = !MDLocation(line: 21, scope: !4)
!37 = !MDLocation(line: 22, scope: !4)
!38 = !MDLocation(line: 25, scope: !7)
!39 = !MDLocation(line: 26, scope: !7)
!40 = !MDLocation(line: 27, scope: !7)
!41 = !MDLocation(line: 28, scope: !7)
!42 = !MDLocation(line: 29, scope: !7)
|
