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[LTO] Load sample profile in LTO link step.

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Summary:
Load sample profile in LTO link step.
ThinLTO calls populateModulePassManager to load the profile

Reviewers: tejohnson, davidxl, danielcdh

Subscribers: mehdi_amini, inglorion, steven_wu, dexonsmith, llvm-commits

Differential Revision: https://reviews.llvm.org/D54564

llvm-svn: 346971
This commit is contained in:
Xin Tong 2018-11-15 18:06:42 +00:00
parent a5b4b79bb8
commit 327fed5d07
3 changed files with 59 additions and 0 deletions
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7
lib/Passes/PassBuilder.cpp
View File

@ -1004,6 +1004,13 @@ PassBuilder::buildLTODefaultPipeline(OptimizationLevel Level, bool DebugLogging,
assert(Level != O0 && "Must request optimizations for the default pipeline!");
ModulePassManager MPM(DebugLogging);
if (PGOOpt && !PGOOpt->SampleProfileFile.empty()) {
// Load sample profile before running the LTO optimization pipeline.
MPM.addPass(SampleProfileLoaderPass(PGOOpt->SampleProfileFile,
PGOOpt->ProfileRemappingFile,
false /* ThinLTOPhase::PreLink */));
}
// Remove unused virtual tables to improve the quality of code generated by
// whole-program devirtualization and bitset lowering.
MPM.addPass(GlobalDCEPass());

6
lib/Transforms/IPO/PassManagerBuilder.cpp
View File

@ -747,6 +747,12 @@ void PassManagerBuilder::populateModulePassManager(
}
void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
// Load sample profile before running the LTO optimization pipeline.
if (!PGOSampleUse.empty()) {
PM.add(createPruneEHPass());
PM.add(createSampleProfileLoaderPass(PGOSampleUse));
}
// Remove unused virtual tables to improve the quality of code generated by
// whole-program devirtualization and bitset lowering.
PM.add(createGlobalDCEPass());

46
test/LTO/Resolution/X86/load-sample-prof-lto.ll Normal file
View File

@ -0,0 +1,46 @@
; Test that LTO pipeline loads profile.
;
; RUN: opt < %s -o %t.bc
; Run the old pm LTO pipeline.
; RUN: llvm-lto2 run -o %t.out %t.bc -save-temps \
; RUN: -r %t.bc,foo,px -r %t.bc,bar,x \
; RUN: -lto-sample-profile-file=%S/Inputs/load-sample-prof.prof
; RUN: llvm-dis %t.out.0.4.opt.bc -o - | FileCheck %s
; Run the new pm LTO pipeline.
; RUN: llvm-lto2 run -o %t.out %t.bc -save-temps -use-new-pm \
; RUN: -r %t.bc,foo,px -r %t.bc,bar,x \
; RUN: -lto-sample-profile-file=%S/Inputs/load-sample-prof.prof
; RUN: llvm-dis %t.out.0.4.opt.bc -o - | FileCheck %s
; Make sure profile information is attached.
; CHECK: !prof
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define void @foo() local_unnamed_addr !dbg !7 {
entry:
tail call void @bar(), !dbg !10
ret void, !dbg !11
}
declare void @bar() local_unnamed_addr
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "test.c", directory: "/tmp")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 6.0.0 "}
!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{null}
!10 = !DILocation(line: 4, column: 5, scope: !7)
!11 = !DILocation(line: 5, column: 1, scope: !7)