xref: /llvm-project/llvm/test/Transforms/PGOProfile/misexpect-branch.ll (revision 9ff36df5a4a7d52c51e950522870bb64912688d2) 
1; Test that misexpect diagnostics are emtted when profile branch weights are
2; below the branch weights added by llvm.expect intrinsics
3
4; RUN: llvm-profdata merge %S/Inputs/misexpect-branch.proftext -o %t.profdata
5
6; 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
7; 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
8; 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
9; RUN: opt < %s -passes="function(lower-expect),pgo-instr-use" -pgo-test-profile-file=%t.profdata -S 2>&1 | FileCheck %s --check-prefix=DISABLED
10; RUN: opt < %s -passes="function(lower-expect),pgo-instr-use" -pgo-test-profile-file=%t.profdata -pgo-warn-misexpect -misexpect-tolerance=81 -pass-remarks=misexpect -S 2>&1 | FileCheck %s --check-prefix=THRESHOLD
11
12; WARNING-DAG: warning: misexpect-branch.c:22:0: 19.98%
13; 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.
14
15; REMARK-NOT: warning: misexpect-branch.c:22:0: 19.98%
16; 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.
17
18; BOTH-DAG: warning: misexpect-branch.c:22:0: 19.98%
19; 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.
20
21; DISABLED-NOT: warning: misexpect-branch.c:22:0: 19.98%
22; 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.
23
24; THRESHOLD-NOT: warning: misexpect-branch.c:22:0: 19.98%
25; THRESHOLD-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.
26
27; ModuleID = 'misexpect-branch.c'
28source_filename = "misexpect-branch.c"
29target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
30target triple = "x86_64-unknown-linux-gnu"
31
32@inner_loop = constant i32 100, align 4
33@outer_loop = constant i32 2000, align 4
34
35; Function Attrs: nounwind
36define i32 @bar() #0 !dbg !6 {
37entry:
38  %rando = alloca i32, align 4
39  %x = alloca i32, align 4
40  call void @llvm.lifetime.start.p0(i64 4, ptr %rando) #4, !dbg !9
41  %call = call i32 (...) @buzz(), !dbg !9
42  store i32 %call, ptr %rando, align 4, !dbg !9, !tbaa !10
43  call void @llvm.lifetime.start.p0(i64 4, ptr %x) #4, !dbg !14
44  store i32 0, ptr %x, align 4, !dbg !14, !tbaa !10
45  %0 = load i32, ptr %rando, align 4, !dbg !15, !tbaa !10
46  %rem = srem i32 %0, 200000, !dbg !15
47  %cmp = icmp eq i32 %rem, 0, !dbg !15
48  %lnot = xor i1 %cmp, true, !dbg !15
49  %lnot1 = xor i1 %lnot, true, !dbg !15
50  %lnot.ext = zext i1 %lnot1 to i32, !dbg !15
51  %conv = sext i32 %lnot.ext to i64, !dbg !15
52  %expval = call i64 @llvm.expect.i64(i64 %conv, i64 1), !dbg !15
53  %tobool = icmp ne i64 %expval, 0, !dbg !15
54  br i1 %tobool, label %if.then, label %if.else, !dbg !15
55
56if.then:                                          ; preds = %entry
57  %1 = load i32, ptr %rando, align 4, !dbg !16, !tbaa !10
58  %call2 = call i32 @baz(i32 %1), !dbg !16
59  store i32 %call2, ptr %x, align 4, !dbg !16, !tbaa !10
60  br label %if.end, !dbg !17
61
62if.else:                                          ; preds = %entry
63  %call3 = call i32 @foo(i32 50), !dbg !18
64  store i32 %call3, ptr %x, align 4, !dbg !18, !tbaa !10
65  br label %if.end
66
67if.end:                                           ; preds = %if.else, %if.then
68  %2 = load i32, ptr %x, align 4, !dbg !19, !tbaa !10
69  call void @llvm.lifetime.end.p0(i64 4, ptr %x) #4, !dbg !20
70  call void @llvm.lifetime.end.p0(i64 4, ptr %rando) #4, !dbg !20
71  ret i32 %2, !dbg !19
72}
73
74; Function Attrs: argmemonly nounwind willreturn
75declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1
76
77declare i32 @buzz(...) #2
78
79; Function Attrs: nounwind readnone willreturn
80declare i64 @llvm.expect.i64(i64, i64) #3
81
82declare i32 @baz(i32) #2
83
84declare i32 @foo(i32) #2
85
86; Function Attrs: argmemonly nounwind willreturn
87declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1
88
89attributes #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" }
90attributes #1 = { argmemonly nounwind willreturn }
91attributes #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" }
92attributes #3 = { nounwind readnone willreturn }
93attributes #4 = { nounwind }
94
95!llvm.dbg.cu = !{!0}
96!llvm.module.flags = !{!3, !4}
97!llvm.ident = !{!5}
98
99!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)
100!1 = !DIFile(filename: "<stdin>", directory: ".")
101!2 = !{}
102!3 = !{i32 2, !"Debug Info Version", i32 3}
103!4 = !{i32 1, !"wchar_size", i32 4}
104!5 = !{!"clang version 10.0.0 (trunk c20270bfffc9d6965219de339d66c61e9fe7d82d)"}
105!6 = distinct !DISubprogram(name: "bar", scope: !7, file: !7, line: 19, type: !8, scopeLine: 19, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
106!7 = !DIFile(filename: "misexpect-branch.c", directory: ".")
107!8 = !DISubroutineType(types: !2)
108!9 = !DILocation(line: 20, scope: !6)
109!10 = !{!11, !11, i64 0}
110!11 = !{!"int", !12, i64 0}
111!12 = !{!"omnipotent char", !13, i64 0}
112!13 = !{!"Simple C/C++ TBAA"}
113!14 = !DILocation(line: 21, scope: !6)
114!15 = !DILocation(line: 22, scope: !6)
115!16 = !DILocation(line: 23, scope: !6)
116!17 = !DILocation(line: 24, scope: !6)
117!18 = !DILocation(line: 25, scope: !6)
118!19 = !DILocation(line: 27, scope: !6)
119!20 = !DILocation(line: 28, scope: !6)
120