1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
; RUN: llvm-profdata merge %S/Inputs/misexpect-branch.proftext -o %t.profdata
; RUN: opt < %s -lower-expect -pgo-instr-use -pgo-test-profile-file=%t.profdata -S -pgo-warn-misexpect 2>&1 | FileCheck %s --check-prefix=WARNING
; RUN: opt < %s -lower-expect -pgo-instr-use -pgo-test-profile-file=%t.profdata -S -pass-remarks=misexpect 2>&1 | FileCheck %s --check-prefix=REMARK
; RUN: opt < %s -lower-expect -pgo-instr-use -pgo-test-profile-file=%t.profdata -S -pgo-warn-misexpect -pass-remarks=misexpect 2>&1 | FileCheck %s --check-prefix=BOTH
; RUN: opt < %s -lower-expect -pgo-instr-use -pgo-test-profile-file=%t.profdata -S 2>&1 | FileCheck %s --check-prefix=DISABLED
; New PM
; RUN: opt < %s -passes="function(lower-expect),pgo-instr-use" -pgo-test-profile-file=%t.profdata -pgo-warn-misexpect -S 2>&1 | FileCheck %s --check-prefix=WARNING
; RUN: opt < %s -passes="function(lower-expect),pgo-instr-use" -pgo-test-profile-file=%t.profdata -pass-remarks=misexpect -S 2>&1 | FileCheck %s --check-prefix=REMARK
; RUN: opt < %s -passes="function(lower-expect),pgo-instr-use" -pgo-test-profile-file=%t.profdata -pgo-warn-misexpect -pass-remarks=misexpect -S 2>&1 | FileCheck %s --check-prefix=BOTH
; RUN: opt < %s -passes="function(lower-expect),pgo-instr-use" -pgo-test-profile-file=%t.profdata -S 2>&1 | FileCheck %s --check-prefix=DISABLED
; WARNING-DAG: warning: misexpect-branch.c:22:0: 19.98%
; WARNING-NOT: remark: misexpect-branch.c:22:0: Potential performance regression from use of the llvm.expect intrinsic: Annotation was correct on 19.98% (399668 / 2000000) of profiled executions.
; REMARK-NOT: warning: misexpect-branch.c:22:0: 19.98%
; REMARK-DAG: remark: misexpect-branch.c:22:0: Potential performance regression from use of the llvm.expect intrinsic: Annotation was correct on 19.98% (399668 / 2000000) of profiled executions.
; BOTH-DAG: warning: misexpect-branch.c:22:0: 19.98%
; BOTH-DAG: remark: misexpect-branch.c:22:0: Potential performance regression from use of the llvm.expect intrinsic: Annotation was correct on 19.98% (399668 / 2000000) of profiled executions.
; DISABLED-NOT: warning: misexpect-branch.c:22:0: 19.98%
; DISABLED-NOT: remark: misexpect-branch.c:22:0: Potential performance regression from use of the llvm.expect intrinsic: Annotation was correct on 19.98% (399668 / 2000000) of profiled executions.
; CHECK-DAG: !{!"misexpect", i64 1, i64 2000, i64 1}
; ModuleID = 'misexpect-branch.c'
source_filename = "misexpect-branch.c"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@inner_loop = constant i32 100, align 4
@outer_loop = constant i32 2000, align 4
; Function Attrs: nounwind
define i32 @bar() #0 !dbg !6 {
entry:
%rando = alloca i32, align 4
%x = alloca i32, align 4
%0 = bitcast i32* %rando to i8*, !dbg !9
call void @llvm.lifetime.start.p0i8(i64 4, i8* %0) #4, !dbg !9
%call = call i32 (...) @buzz(), !dbg !9
store i32 %call, i32* %rando, align 4, !dbg !9, !tbaa !10
%1 = bitcast i32* %x to i8*, !dbg !14
call void @llvm.lifetime.start.p0i8(i64 4, i8* %1) #4, !dbg !14
store i32 0, i32* %x, align 4, !dbg !14, !tbaa !10
%2 = load i32, i32* %rando, align 4, !dbg !15, !tbaa !10
%rem = srem i32 %2, 200000, !dbg !15
%cmp = icmp eq i32 %rem, 0, !dbg !15
%lnot = xor i1 %cmp, true, !dbg !15
%lnot1 = xor i1 %lnot, true, !dbg !15
%lnot.ext = zext i1 %lnot1 to i32, !dbg !15
%conv = sext i32 %lnot.ext to i64, !dbg !15
%expval = call i64 @llvm.expect.i64(i64 %conv, i64 1), !dbg !15
%tobool = icmp ne i64 %expval, 0, !dbg !15
br i1 %tobool, label %if.then, label %if.else, !dbg !15
if.then: ; preds = %entry
%3 = load i32, i32* %rando, align 4, !dbg !16, !tbaa !10
%call2 = call i32 @baz(i32 %3), !dbg !16
store i32 %call2, i32* %x, align 4, !dbg !16, !tbaa !10
br label %if.end, !dbg !17
if.else: ; preds = %entry
%call3 = call i32 @foo(i32 50), !dbg !18
store i32 %call3, i32* %x, align 4, !dbg !18, !tbaa !10
br label %if.end
if.end: ; preds = %if.else, %if.then
%4 = load i32, i32* %x, align 4, !dbg !19, !tbaa !10
%5 = bitcast i32* %x to i8*, !dbg !20
call void @llvm.lifetime.end.p0i8(i64 4, i8* %5) #4, !dbg !20
%6 = bitcast i32* %rando to i8*, !dbg !20
call void @llvm.lifetime.end.p0i8(i64 4, i8* %6) #4, !dbg !20
ret i32 %4, !dbg !19
}
; Function Attrs: argmemonly nounwind willreturn
declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1
declare i32 @buzz(...) #2
; Function Attrs: nounwind readnone willreturn
declare i64 @llvm.expect.i64(i64, i64) #3
declare i32 @baz(i32) #2
declare i32 @foo(i32) #2
; Function Attrs: argmemonly nounwind willreturn
declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="none" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-features"="+cx8,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { argmemonly nounwind willreturn }
attributes #2 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="none" "less-precise-fpmad"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-features"="+cx8,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #3 = { nounwind readnone willreturn }
attributes #4 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!llvm.ident = !{!5}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (trunk c20270bfffc9d6965219de339d66c61e9fe7d82d)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "<stdin>", directory: ".")
!2 = !{}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{i32 1, !"wchar_size", i32 4}
!5 = !{!"clang version 10.0.0 (trunk c20270bfffc9d6965219de339d66c61e9fe7d82d)"}
!6 = distinct !DISubprogram(name: "bar", scope: !7, file: !7, line: 19, type: !8, scopeLine: 19, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
!7 = !DIFile(filename: "misexpect-branch.c", directory: ".")
!8 = !DISubroutineType(types: !2)
!9 = !DILocation(line: 20, scope: !6)
!10 = !{!11, !11, i64 0}
!11 = !{!"int", !12, i64 0}
!12 = !{!"omnipotent char", !13, i64 0}
!13 = !{!"Simple C/C++ TBAA"}
!14 = !DILocation(line: 21, scope: !6)
!15 = !DILocation(line: 22, scope: !6)
!16 = !DILocation(line: 23, scope: !6)
!17 = !DILocation(line: 24, scope: !6)
!18 = !DILocation(line: 25, scope: !6)
!19 = !DILocation(line: 27, scope: !6)
!20 = !DILocation(line: 28, scope: !6)
|