3adc6e0308
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. The block count is only used for scaling of partial sample profiles, and was added in D80403 for D79831. This patch simply removes this field from the index files of non partial sample profile compiles, which is NFC on the output of the compiler. We subsequently need to see if this can be removed for partial sample profiles without signficant performance loss, or redesigned in a way that does not destroy caching. Differential Revision: https://reviews.llvm.org/D148746
123 lines
4.0 KiB
LLVM
123 lines
4.0 KiB
LLVM
; Test to check the callgraph in summary when there is PGO
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; RUN: opt -module-summary %s -o %t.o
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; RUN: llvm-bcanalyzer -dump %t.o | FileCheck %s
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; RUN: opt -module-summary %p/Inputs/thinlto-function-summary-callgraph-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 --check-prefix=COMBINED
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; CHECK: <SOURCE_FILENAME
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; "hot_function"
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; CHECK-NEXT: <FUNCTION op0=0 op1=12
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; "hot1"
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; CHECK-NEXT: <FUNCTION op0=12 op1=4
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; "hot2"
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; CHECK-NEXT: <FUNCTION op0=16 op1=4
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; "hot3"
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; CHECK-NEXT: <FUNCTION op0=20 op1=4
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; "hot4"
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; CHECK-NEXT: <FUNCTION op0=24 op1=5
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; "cold"
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; CHECK-NEXT: <FUNCTION op0=29 op1=5
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; "none1"
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; CHECK-NEXT: <FUNCTION op0=34 op1=5
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; "none2"
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; CHECK-NEXT: <FUNCTION op0=39 op1=5
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; "none3"
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; CHECK-NEXT: <FUNCTION op0=44 op1=5
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; CHECK-NEXT: <FUNCTION op0=49 op1=5
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; CHECK-LABEL: <GLOBALVAL_SUMMARY_BLOCK
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; CHECK-NEXT: <VERSION
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; CHECK-NEXT: <FLAGS
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; CHECK-NEXT: <VALUE_GUID op0=26 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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; CHECK-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=26 op26=4/>
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; CHECK-NEXT: </GLOBALVAL_SUMMARY_BLOCK>
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; CHECK: <STRTAB_BLOCK
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; CHECK-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: </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 !15
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call void @cold1(), !prof !16
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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 !15
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call void @cold2(), !prof !16
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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 !15
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call void @cold3(), !prof !16
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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}
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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 = !{!"DetailedSummary", !11}
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!11 = !{!12, !13, !14}
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!12 = !{i32 10000, i64 100, i32 1}
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!13 = !{i32 999000, i64 100, i32 1}
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!14 = !{i32 999999, i64 1, i32 2}
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!15 = !{!"branch_weights", i32 100}
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!16 = !{!"branch_weights", i32 1}
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