aae8524bcc
As pointed out in
https://discourse.llvm.org/t/undeterministic-thin-index-file/69985, the
block count added to distributed ThinLTO index files breaks incremental
builds on ThinLTO - if any linked file has a different number of BBs,
then the accumulated sum placed in the index files will change, causing
all ThinLTO backend compiles to be redone.
This was only used for partial sample profiles, and was therefore
removed for other cases (3adc6e0308).
Subsequent testing did not show a performance effect of disabling this
feature even for partial sample profiles. Therefore, switch the default
to false. If this does not cause a noticeable performance degradation
after the default flip, we can remove this support completely.
Differential Revision: https://reviews.llvm.org/D151249
134 lines
4.9 KiB
LLVM
134 lines
4.9 KiB
LLVM
;; Test to check the callgraph in summary when partial sample profile scaling
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;; enabled.
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; RUN: opt -module-summary %s -o %t.o -scale-partial-sample-profile-working-set-size
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; RUN: llvm-bcanalyzer -dump %t.o | FileCheck %s --check-prefix=PERMODULE
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; RUN: opt -module-summary %p/Inputs/thinlto-function-summary-callgraph-partial-sample-profile-summary.ll -o %t2.o -scale-partial-sample-profile-working-set-size
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; RUN: llvm-lto -thinlto -o %t3 %t.o %t2.o
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; RUN: llvm-bcanalyzer -dump %t3.thinlto.bc | FileCheck %s --check-prefix=COMBINED
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;; Check that we don't get block count records when it isn't explicitly enabled.
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; RUN: opt -module-summary %s -o %t.o
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; RUN: llvm-bcanalyzer -dump %t.o | FileCheck %s --implicit-check-not=BLOCK_COUNT
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; RUN: opt -module-summary %p/Inputs/thinlto-function-summary-callgraph-partial-sample-profile-summary.ll -o %t2.o
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; RUN: llvm-lto -thinlto -o %t3 %t.o %t2.o
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; RUN: llvm-bcanalyzer -dump %t3.thinlto.bc | FileCheck %s --implicit-check-not=BLOCK_COUNT
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; PERMODULE: <SOURCE_FILENAME
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; "hot_function"
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; PERMODULE-NEXT: <FUNCTION op0=0 op1=12
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; "hot1"
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; PERMODULE-NEXT: <FUNCTION op0=12 op1=4
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; "hot2"
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; PERMODULE-NEXT: <FUNCTION op0=16 op1=4
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; "hot3"
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; PERMODULE-NEXT: <FUNCTION op0=20 op1=4
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; "hot4"
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; PERMODULE-NEXT: <FUNCTION op0=24 op1=5
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; "cold"
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; PERMODULE-NEXT: <FUNCTION op0=29 op1=5
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; "none1"
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; PERMODULE-NEXT: <FUNCTION op0=34 op1=5
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; "none2"
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; PERMODULE-NEXT: <FUNCTION op0=39 op1=5
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; "none3"
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; PERMODULE-NEXT: <FUNCTION op0=44 op1=5
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; PERMODULE-NEXT: <FUNCTION op0=49 op1=5
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; PERMODULE-LABEL: <GLOBALVAL_SUMMARY_BLOCK
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; PERMODULE-NEXT: <VERSION
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; PERMODULE-NEXT: <FLAGS
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; PERMODULE-NEXT: <VALUE_GUID op0=27 op1=123/>
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; op4=none1 op6=hot1 op8=cold1 op10=none2 op12=hot2 op14=cold2 op16=none3 op18=hot3 op20=cold3 op22=123
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; PERMODULE-NEXT: <PERMODULE_PROFILE {{.*}} op7=7 op8=0 op9=1 op10=3 op11=4 op12=1 op13=8 op14=0 op15=2 op16=3 op17=5 op18=1 op19=9 op20=0 op21=3 op22=3 op23=6 op24=1 op25=27 op26=4/>
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; PERMODULE-NEXT: <BLOCK_COUNT op0=4/>
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; PERMODULE-NEXT: </GLOBALVAL_SUMMARY_BLOCK>
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; PERMODULE: <STRTAB_BLOCK
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; PERMODULE-NEXT: blob data = 'hot_functionhot1hot2hot3cold1cold2cold3none1none2none3{{.*}}'
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; COMBINED: <GLOBALVAL_SUMMARY_BLOCK
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; COMBINED-NEXT: <VERSION
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; COMBINED-NEXT: <FLAGS
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; COMBINED-NEXT: <VALUE_GUID
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; COMBINED-NEXT: <VALUE_GUID
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; COMBINED-NEXT: <VALUE_GUID
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; COMBINED-NEXT: <VALUE_GUID
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; COMBINED-NEXT: <VALUE_GUID
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; COMBINED-NEXT: <VALUE_GUID
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; COMBINED-NEXT: <VALUE_GUID
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; COMBINED-NEXT: <VALUE_GUID
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; COMBINED-NEXT: <VALUE_GUID
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; COMBINED-NEXT: <VALUE_GUID
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; COMBINED-NEXT: <COMBINED abbrevid=
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; COMBINED-NEXT: <COMBINED abbrevid=
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; COMBINED-NEXT: <COMBINED abbrevid=
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; COMBINED-NEXT: <COMBINED abbrevid=
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; COMBINED-NEXT: <COMBINED abbrevid=
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; COMBINED-NEXT: <COMBINED abbrevid=
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; COMBINED-NEXT: <COMBINED abbrevid=
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; COMBINED-NEXT: <COMBINED abbrevid=
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; COMBINED-NEXT: <COMBINED_PROFILE {{.*}} op9=[[NONE1:.*]] op10=0 op11=[[HOT1:.*]] op12=3 op13=[[COLD1:.*]] op14=1 op15=[[NONE2:.*]] op16=0 op17=[[HOT2:.*]] op18=3 op19=[[COLD2:.*]] op20=1 op21=[[NONE3:.*]] op22=0 op23=[[HOT3:.*]] op24=3 op25=[[COLD3:.*]] op26=1/>
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; COMBINED-NEXT: <COMBINED abbrevid=
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; COMBINED-NEXT: <BLOCK_COUNT op0=13/>
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; COMBINED-NEXT: </GLOBALVAL_SUMMARY_BLOCK>
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; ModuleID = 'thinlto-function-summary-callgraph.ll'
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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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; This function have high profile count, so entry block is hot.
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define void @hot_function(i1 %a, i1 %a2) !prof !20 {
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entry:
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call void @none1()
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call void @hot1(), !prof !17
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call void @cold1(), !prof !18
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br i1 %a, label %Cold, label %Hot, !prof !41
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Cold: ; 1/1000 goes here
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call void @none2()
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call void @hot2(), !prof !17
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call void @cold2(), !prof !18
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br label %exit
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Hot: ; 999/1000 goes here
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call void @none3()
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call void @hot3(), !prof !17
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call void @cold3(), !prof !18
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br label %exit
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exit:
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ret void
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}
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declare void @hot1() #1
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declare void @hot2() #1
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declare void @hot3() #1
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declare void @cold1() #1
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declare void @cold2() #1
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declare void @cold3() #1
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declare void @none1() #1
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declare void @none2() #1
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declare void @none3() #1
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!41 = !{!"branch_weights", i32 1, i32 1000}
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!llvm.module.flags = !{!1}
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!20 = !{!"function_entry_count", i64 110, i64 123}
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!1 = !{i32 1, !"ProfileSummary", !2}
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!2 = !{!3, !4, !5, !6, !7, !8, !9, !10, !11, !12}
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!3 = !{!"ProfileFormat", !"SampleProfile"}
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!4 = !{!"TotalCount", i64 10000}
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!5 = !{!"MaxCount", i64 10}
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!6 = !{!"MaxInternalCount", i64 1}
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!7 = !{!"MaxFunctionCount", i64 1000}
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!8 = !{!"NumCounts", i64 3}
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!9 = !{!"NumFunctions", i64 3}
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!10 = !{!"IsPartialProfile", i64 1}
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!11 = !{!"PartialProfileRatio", double 0.5}
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!12 = !{!"DetailedSummary", !13}
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!13 = !{!14, !15, !16}
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!14 = !{i32 10000, i64 100, i32 1}
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!15 = !{i32 999000, i64 100, i32 1}
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!16 = !{i32 999999, i64 1, i32 2}
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!17 = !{!"branch_weights", i32 100}
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!18 = !{!"branch_weights", i32 1}
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