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clang-p2996/llvm/test/Transforms/SampleProfile/profile-sample-accurate.ll
Wei Mi 7fb400112f [SampleFDO] Add a cutoff flag to control how many symbols will be included 
into profile symbol list.

When test is unrepresentative to production behavior, sample profile
collected from production can cause unexpected performance behavior
in test. To triage such issue, it is useful to have a cutoff flag
to control how many symbols will be included into profile symbol list
in order to do binary search.

Differential Revision: https://reviews.llvm.org/D97623
2021-02-27 23:15:31 -08:00

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; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/profsampleacc.extbinary.afdo -profile-summary-cutoff-hot=600000 -profile-sample-accurate -enable-new-pm=0 -S | FileCheck %s --check-prefix=CALL_SUM_IS_WARM
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/profsampleacc.extbinary.afdo -profile-summary-cutoff-hot=900000 -profile-sample-accurate -S | FileCheck %s --check-prefix=CALL_SUM_IS_HOT
; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/profsampleacc.extbinary.afdo -profile-summary-cutoff-hot=600000 -profile-sample-accurate -enable-new-pm=0 -S | FileCheck %s --check-prefix=CALL_SUM_IS_WARM
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/profsampleacc.extbinary.afdo -profile-summary-cutoff-hot=900000 -profile-sample-accurate -S | FileCheck %s --check-prefix=CALL_SUM_IS_HOT
; RUN: llvm-profdata merge -sample -extbinary -prof-sym-list=%S/Inputs/profile-symbol-list.text %S/Inputs/profsampleacc.extbinary.afdo -o %t.symlist.afdo
; RUN: opt < %s -sample-profile -sample-profile-file=%t.symlist.afdo -profile-summary-cutoff-hot=600000 -profile-accurate-for-symsinlist -enable-new-pm=0 -S | FileCheck %s --check-prefix=PROFSYMLIST
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%t.symlist.afdo -profile-summary-cutoff-hot=600000 -profile-accurate-for-symsinlist -S | FileCheck %s --check-prefix=PROFSYMLIST
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%t.symlist.afdo -profile-accurate-for-symsinlist -profile-symbol-list-cutoff=2 -S | FileCheck %s --check-prefix=PSLCUTOFF2
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%t.symlist.afdo -profile-accurate-for-symsinlist -profile-symbol-list-cutoff=3 -S | FileCheck %s --check-prefix=PSLCUTOFF3
;
; If -profile-accurate-for-symsinlist and -profile-sample-accurate both present,
; -profile-sample-accurate will override -profile-accurate-for-symsinlist.
; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/profsampleacc.extbinary.afdo -profile-summary-cutoff-hot=600000 -profile-sample-accurate -profile-accurate-for-symsinlist -enable-new-pm=0 -S | FileCheck %s --check-prefix=CALL_SUM_IS_WARM
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/profsampleacc.extbinary.afdo -profile-summary-cutoff-hot=900000 -profile-sample-accurate -profile-accurate-for-symsinlist -S | FileCheck %s --check-prefix=CALL_SUM_IS_HOT
; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/profsampleacc.extbinary.afdo -profile-summary-cutoff-hot=600000 -profile-sample-accurate -profile-accurate-for-symsinlist -enable-new-pm=0 -S | FileCheck %s --check-prefix=CALL_SUM_IS_WARM
; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/profsampleacc.extbinary.afdo -profile-summary-cutoff-hot=900000 -profile-sample-accurate -profile-accurate-for-symsinlist -S | FileCheck %s --check-prefix=CALL_SUM_IS_HOT
;
; Original C++ test case
;
; #include <stdio.h>
;
; int sum(int x, int y) {
; return x + y;
; }
;
; int main() {
; int s, i = 0;
; while (i++ < 20000 * 20000)
; if (i != 100) s = sum(i, s); else s = 30;
; printf("sum is %d\n", s);
; return 0;
; }
;
@.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1
; Check _Z3sumii's function entry count will be 0 when
; profile-sample-accurate is enabled.
; CALL_SUM_IS_HOT: define i32 @_Z3sumii{{.*}}!prof ![[ZERO_ID:[0-9]+]]
;
; Check _Z3sumii's function entry count will be nonzero when
; profile-sample-accurate is enabled because the callsite is warm and not
; inlined so its function entry count is adjusted to nonzero.
; CALL_SUM_IS_WARM: define i32 @_Z3sumii{{.*}}!prof ![[NONZERO_ID:[0-9]+]]
;
; Check _Z3sumii's function entry count will be initialized to -1 when
; profile-accurate-for-profsymlist is enabled and _Z3sumii exists in the
; profile symbol list because it also shows up in the profile as inline
; instance.
; PROFSYMLIST: define i32 @_Z3sumii{{.*}}!prof ![[UNKNOWN_ID:[0-9]+]]
;
; Function Attrs: nounwind uwtable
define i32 @_Z3sumii(i32 %x, i32 %y) #0 !dbg !4 {
entry:
%x.addr = alloca i32, align 4
%y.addr = alloca i32, align 4
store i32 %x, i32* %x.addr, align 4
store i32 %y, i32* %y.addr, align 4
%0 = load i32, i32* %x.addr, align 4, !dbg !11
%1 = load i32, i32* %y.addr, align 4, !dbg !11
%add = add nsw i32 %0, %1, !dbg !11
ret i32 %add, !dbg !11
}
; Check -profile-symbol-list-cutoff=3 will include _Z3toov into profile
; symbol list and -profile-symbol-list-cutoff=2 will not.
; PSLCUTOFF2: define i32 @_Z3toov{{.*}}!prof ![[TOO_ID:[0-9]+]]
; PSLCUTOFF3: define i32 @_Z3toov{{.*}}!prof ![[TOO_ID:[0-9]+]]
define i32 @_Z3toov(i32 %x, i32 %y) #0 {
entry:
%add = add nsw i32 %x, %y
ret i32 %add
}
; Function Attrs: uwtable
define i32 @main() #0 !dbg !7 {
entry:
%retval = alloca i32, align 4
%s = alloca i32, align 4
%i = alloca i32, align 4
store i32 0, i32* %retval
store i32 0, i32* %i, align 4, !dbg !12
br label %while.cond, !dbg !13
while.cond: ; preds = %if.end, %entry
%0 = load i32, i32* %i, align 4, !dbg !14
%inc = add nsw i32 %0, 1, !dbg !14
store i32 %inc, i32* %i, align 4, !dbg !14
%cmp = icmp slt i32 %0, 400000000, !dbg !14
br i1 %cmp, label %while.body, label %while.end, !dbg !14
while.body: ; preds = %while.cond
%1 = load i32, i32* %i, align 4, !dbg !16
%cmp1 = icmp ne i32 %1, 100, !dbg !16
br i1 %cmp1, label %if.then, label %if.else, !dbg !16
; With the hot cutoff being set to 600000, the inline instance of _Z3sumii
; in main is neither hot nor cold. Check it won't be inlined when
; profile-sample-accurate is enabled.
; CALL_SUM_IS_WARM: if.then:
; CALL_SUM_IS_WARM: call i32 @_Z3sumii
; CALL_SUM_IS_WARM: if.else:
;
; With the hot cutoff being set to 900000, the inline instance of _Z3sumii
; in main is hot. Check the callsite of _Z3sumii will be inlined when
; profile-sample-accurate is enabled.
; CALL_SUM_IS_HOT: if.then:
; CALL_SUM_IS_HOT-NOT: call i32 @_Z3sumii
; CALL_SUM_IS_HOT: if.else:
;
; Check _Z3sumii will be inlined when profile-accurate-for-profsymlist is
; enabled
; PROFSYMLIST: if.then:
; PROFSYMLIST-NOT: call i32 @_Z3sumii
; PROFSYMLIST: if.else:
if.then: ; preds = %while.body
%2 = load i32, i32* %i, align 4, !dbg !18
%3 = load i32, i32* %s, align 4, !dbg !18
%call = call i32 @_Z3sumii(i32 %2, i32 %3), !dbg !18
store i32 %call, i32* %s, align 4, !dbg !18
br label %if.end, !dbg !18
if.else: ; preds = %while.body
store i32 30, i32* %s, align 4, !dbg !20
br label %if.end
if.end: ; preds = %if.else, %if.then
br label %while.cond, !dbg !22
while.end: ; preds = %while.cond
%4 = load i32, i32* %s, align 4, !dbg !24
%call2 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i32 0, i32 0), i32 %4), !dbg !24
ret i32 0, !dbg !25
}
declare i32 @printf(i8*, ...) #2
attributes #0 = { "use-sample-profile" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!8, !9}
!llvm.ident = !{!10}
; CALL_SUM_IS_HOT: ![[ZERO_ID]] = !{!"function_entry_count", i64 0}
; CALL_SUM_IS_WARM: ![[NONZERO_ID]] = !{!"function_entry_count", i64 5179}
; PROFSYMLIST: ![[UNKNOWN_ID]] = !{!"function_entry_count", i64 -1}
; PSLCUTOFF2: ![[TOO_ID]] = !{!"function_entry_count", i64 -1}
; PSLCUTOFF3: ![[TOO_ID]] = !{!"function_entry_count", i64 0}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: NoDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
!1 = !DIFile(filename: "calls.cc", directory: ".")
!2 = !{}
!4 = distinct !DISubprogram(name: "sum", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !5, type: !6, retainedNodes: !2)
!5 = !DIFile(filename: "calls.cc", directory: ".")
!6 = !DISubroutineType(types: !2)
!7 = distinct !DISubprogram(name: "main", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 7, file: !1, scope: !5, type: !6, retainedNodes: !2)
!8 = !{i32 2, !"Dwarf Version", i32 4}
!9 = !{i32 1, !"Debug Info Version", i32 3}
!10 = !{!"clang version 3.5 "}
!11 = !DILocation(line: 4, scope: !4)
!12 = !DILocation(line: 8, scope: !7)
!13 = !DILocation(line: 9, scope: !7)
!14 = !DILocation(line: 9, scope: !15)
!15 = !DILexicalBlockFile(discriminator: 2, file: !1, scope: !7)
!16 = !DILocation(line: 10, scope: !17)
!17 = distinct !DILexicalBlock(line: 10, column: 0, file: !1, scope: !7)
!18 = !DILocation(line: 10, scope: !19)
!19 = !DILexicalBlockFile(discriminator: 2, file: !1, scope: !17)
!20 = !DILocation(line: 10, scope: !21)
!21 = !DILexicalBlockFile(discriminator: 4, file: !1, scope: !17)
!22 = !DILocation(line: 10, scope: !23)
!23 = !DILexicalBlockFile(discriminator: 6, file: !1, scope: !17)
!24 = !DILocation(line: 11, scope: !7)
!25 = !DILocation(line: 12, scope: !7)
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