b4fcaa137f
This corrects a couple off by ones related to the sampling of **instrumented** counters, and enables setting 100% rates for burst sampling (burst duration = period). Off by ones: Prior to this change it was impossible to set a period of 65535 because this was converted to fast sampling which rollsover at USHRT_MAX + 1 (65536). Similarly the burst durations would collect burst duration + 1 counts as they used an ULE comparison. 100% sampling: Although this is not useful for a productionized use case, it does allow for more deterministic testing with the sampling checks in place. After all the off by ones are fixed, allowing for 100% sampling is a matter of letting burst duration = period.
113 lines
4.1 KiB
LLVM
113 lines
4.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; REQUIRES: x86-registered-target
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; RUN: opt -module-summary %s -o %t1.bc
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; RUN: opt -module-summary %S/Inputs/cspgo_bar_sample.ll -o %t2.bc
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; RUN: llvm-lto2 run -lto-cspgo-profile-file=alloc -enable-sampled-instrumentation -lto-cspgo-gen -save-temps -o %t %t1.bc %t2.bc \
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; RUN: -r=%t1.bc,foo,pl \
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; RUN: -r=%t1.bc,bar,l \
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; RUN: -r=%t1.bc,main,plx \
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; RUN: -r=%t1.bc,__llvm_profile_filename,plx \
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; RUN: -r=%t1.bc,__llvm_profile_raw_version,plx \
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; RUN: -r=%t1.bc,__llvm_profile_sampling,pl \
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; RUN: -r=%t2.bc,bar,pl \
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; RUN: -r=%t2.bc,odd,pl \
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; RUN: -r=%t2.bc,even,pl \
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; RUN: -r=%t2.bc,__llvm_profile_filename,x \
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; RUN: -r=%t2.bc,__llvm_profile_raw_version,x \
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; RUN: -r=%t2.bc,__llvm_profile_sampling,
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; RUN: llvm-dis %t.1.4.opt.bc -o - | FileCheck %s --check-prefix=CSGEN
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; CSGEN: @__llvm_profile_sampling = thread_local global i16 0, comdat
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; CSGEN: @__profc_
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; CSGEN: @__profd_
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source_filename = "cspgo.c"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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$__llvm_profile_filename = comdat any
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$__llvm_profile_raw_version = comdat any
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$__llvm_profile_sampling = comdat any
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@__llvm_profile_filename = local_unnamed_addr constant [25 x i8] c"pass2/default_%m.profraw\00", comdat
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@__llvm_profile_raw_version = local_unnamed_addr constant i64 216172782113783812, comdat
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@__llvm_profile_sampling = thread_local global i16 0, comdat
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@llvm.used = appending global [1 x i8*] [i8* bitcast (i64* @__llvm_profile_sampling to i8*)], section "llvm.metadata"
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define dso_local void @foo() #0 !prof !30 {
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entry:
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br label %for.body
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for.body:
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%i.06 = phi i32 [ 0, %entry ], [ %add1, %for.body ]
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tail call void @bar(i32 %i.06) #3
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%add = or i32 %i.06, 1
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tail call void @bar(i32 %add) #3
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%add1 = add nuw nsw i32 %i.06, 2
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%cmp = icmp ult i32 %add1, 200000
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br i1 %cmp, label %for.body, label %for.end, !prof !31
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for.end:
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ret void
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}
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; CSGEN-LABEL: @foo
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; CSGEN: [[TMP0:%.*]] = load i16, ptr @__llvm_profile_sampling, align 2
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; CSGEN-NEXT: [[TMP1:%.*]] = icmp ult i16 [[TMP0]], 200
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; CSGEN-NEXT: br i1 [[TMP1]], label %{{.*}}, label %{{.*}}, !prof [[PROF:![0-9]+]]
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; CSGEN: [[TMP2:%.*]] = add i16 {{.*}}, 1
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; CSGEN-NEXT: store i16 [[TMP2]], ptr @__llvm_profile_sampling, align 2
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declare dso_local void @bar(i32)
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define dso_local i32 @main() !prof !30 {
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entry:
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tail call void @foo()
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ret i32 0
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}
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; CSGEN-LABEL: @main
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; CSGEN: [[TMP0:%.*]] = load i16, ptr @__llvm_profile_sampling, align 2
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; CSGEN-NEXT: [[TMP1:%.*]] = icmp ult i16 [[TMP0]], 200
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; CSGEN-NEXT: br i1 [[TMP1]], label %{{.*}}, label %{{.*}}, !prof [[PROF:![0-9]+]]
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; CSGEN: [[TMP2:%.*]] = add i16 {{.*}}, 1
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; CSGEN-NEXT: store i16 [[TMP2]], ptr @__llvm_profile_sampling, align 2
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attributes #0 = { "target-cpu"="x86-64" }
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!llvm.module.flags = !{!0, !1, !2}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{i32 1, !"EnableSplitLTOUnit", i32 0}
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!2 = !{i32 1, !"ProfileSummary", !3}
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!3 = !{!4, !5, !6, !7, !8, !9, !10, !11}
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!4 = !{!"ProfileFormat", !"InstrProf"}
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!5 = !{!"TotalCount", i64 500002}
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!6 = !{!"MaxCount", i64 200000}
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!7 = !{!"MaxInternalCount", i64 100000}
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!8 = !{!"MaxFunctionCount", i64 200000}
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!9 = !{!"NumCounts", i64 6}
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!10 = !{!"NumFunctions", i64 4}
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!11 = !{!"DetailedSummary", !12}
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!12 = !{!13, !14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !28}
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!13 = !{i32 10000, i64 200000, i32 1}
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!14 = !{i32 100000, i64 200000, i32 1}
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!15 = !{i32 200000, i64 200000, i32 1}
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!16 = !{i32 300000, i64 200000, i32 1}
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!17 = !{i32 400000, i64 200000, i32 1}
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!18 = !{i32 500000, i64 100000, i32 4}
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!19 = !{i32 600000, i64 100000, i32 4}
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!20 = !{i32 700000, i64 100000, i32 4}
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!21 = !{i32 800000, i64 100000, i32 4}
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!22 = !{i32 900000, i64 100000, i32 4}
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!23 = !{i32 950000, i64 100000, i32 4}
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!24 = !{i32 990000, i64 100000, i32 4}
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!25 = !{i32 999000, i64 100000, i32 4}
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!26 = !{i32 999900, i64 100000, i32 4}
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!27 = !{i32 999990, i64 100000, i32 4}
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!28 = !{i32 999999, i64 1, i32 6}
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!30 = !{!"function_entry_count", i64 1}
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!31 = !{!"branch_weights", i32 100000, i32 1}
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; CSGEN: [[PROF]] = !{!"branch_weights", i32 200, i32 65336}
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