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37dc2d9629
Summary: A recent fix to drop dead symbols (r323633) did not work for ThinLTO distributed backends because we lose the WithGlobalValueDeadStripping set on the index during the thin link. This patch adds a new flags record to the bitcode format for the index, and serializes this flag for the combined index (it would always be 0 for the per-module index generated by the compile step, so no need to serialize the new flags record there until/unless we add another flag that applies to the per-module indexes). Generally this flag should always be set for the distributed backends, which are necessarily performed after the thin link. However, if we were to simply set this flag on the index applied to the distributed backends (invoked via clang), we would lose the ability to disable dead stripping via -compute-dead=false for debugging purposes. Reviewers: grimar, pcc Subscribers: mehdi_amini, inglorion, eraman, llvm-commits Differential Revision: https://reviews.llvm.org/D42799 llvm-svn: 324444
122 lines
4.0 KiB
LLVM
122 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: <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 {{.*}} op5=7 op6=0 op7=1 op8=3 op9=4 op10=1 op11=8 op12=0 op13=2 op14=3 op15=5 op16=1 op17=9 op18=0 op19=3 op20=3 op21=6 op22=1 op23=26 op24=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 {{.*}} op6=[[NONE1:.*]] op7=0 op8=[[HOT1:.*]] op9=3 op10=[[COLD1:.*]] op11=1 op12=[[NONE2:.*]] op13=0 op14=[[HOT2:.*]] op15=3 op16=[[COLD2:.*]] op17=1 op18=[[NONE3:.*]] op19=0 op20=[[HOT3:.*]] op21=3 op22=[[COLD3:.*]] op23=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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