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[ThinLTO] Pass down opt level to LTO backend and handle -O0 LTO in new PM

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Summary:
The opt level was not being passed down to the ThinLTO backend when
invoked via clang (for distributed ThinLTO).

This exposed an issue where the new PM was asserting if the Thin or
regular LTO backend pipelines were invoked with -O0 (not a new issue,
could be provoked by invoking in-process *LTO backends via linker using
new PM and -O0). Fix this similar to the old PM where -O0 only does the
necessary lowering of type metadata (WPD and LowerTypeTest passes) and
then quits, rather than asserting.

Reviewers: xur

Subscribers: mehdi_amini, inglorion, eraman, hiraditya, steven_wu, dexonsmith, cfe-commits, llvm-commits, pcc

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D61022

llvm-svn: 359025
This commit is contained in:
Teresa Johnson 2019-04-23 18:56:19 +00:00
parent e063765ded
commit 9937f43a8d
2 changed files with 31 additions and 3 deletions
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15
lib/Passes/PassBuilder.cpp
View File

@ -1046,10 +1046,16 @@ ModulePassManager PassBuilder::buildThinLTODefaultPipeline(
//
// Also, WPD has access to more precise information than ICP and can
// devirtualize more effectively, so it should operate on the IR first.
//
// The WPD and LowerTypeTest passes need to run at -O0 to lower type
// metadata and intrinsics.
MPM.addPass(WholeProgramDevirtPass(nullptr, ImportSummary));
MPM.addPass(LowerTypeTestsPass(nullptr, ImportSummary));
}
if (Level == O0)
return MPM;
// Force any function attributes we want the rest of the pipeline to observe.
MPM.addPass(ForceFunctionAttrsPass());
@ -1075,9 +1081,16 @@ PassBuilder::buildLTOPreLinkDefaultPipeline(OptimizationLevel Level,
ModulePassManager
PassBuilder::buildLTODefaultPipeline(OptimizationLevel Level, bool DebugLogging,
ModuleSummaryIndex *ExportSummary) {
assert(Level != O0 && "Must request optimizations for the default pipeline!");
ModulePassManager MPM(DebugLogging);
if (Level == O0) {
// The WPD and LowerTypeTest passes need to run at -O0 to lower type
// metadata and intrinsics.
MPM.addPass(WholeProgramDevirtPass(ExportSummary, nullptr));
MPM.addPass(LowerTypeTestsPass(ExportSummary, nullptr));
return MPM;
}
if (PGOOpt && PGOOpt->Action == PGOOptions::SampleUse) {
// Load sample profile before running the LTO optimization pipeline.
MPM.addPass(SampleProfileLoaderPass(PGOOpt->ProfileFile,

19
test/tools/gold/X86/opt-level.ll
View File

@ -6,12 +6,25 @@
; RUN: %gold -plugin %llvmshlibdir/LLVMgold%shlibext -plugin-opt=save-temps \
; RUN: -m elf_x86_64 \
; RUN: -plugin-opt=O1 -r -o %t.o %t.bc
; RUN: llvm-dis < %t.o.0.4.opt.bc -o - | FileCheck --check-prefix=CHECK-O1 %s
; RUN: llvm-dis < %t.o.0.4.opt.bc -o - | FileCheck --check-prefix=CHECK-O1 --check-prefix=CHECK-O1-OLDPM %s
; RUN: %gold -plugin %llvmshlibdir/LLVMgold%shlibext -plugin-opt=save-temps \
; RUN: -m elf_x86_64 \
; RUN: -plugin-opt=O2 -r -o %t.o %t.bc
; RUN: llvm-dis < %t.o.0.4.opt.bc -o - | FileCheck --check-prefix=CHECK-O2 %s
; RUN: %gold -plugin %llvmshlibdir/LLVMgold%shlibext -plugin-opt=save-temps \
; RUN: -m elf_x86_64 --plugin-opt=new-pass-manager \
; RUN: -plugin-opt=O0 -r -o %t.o %t.bc
; RUN: llvm-dis < %t.o.0.4.opt.bc -o - | FileCheck --check-prefix=CHECK-O0 %s
; RUN: %gold -plugin %llvmshlibdir/LLVMgold%shlibext -plugin-opt=save-temps \
; RUN: -m elf_x86_64 --plugin-opt=new-pass-manager \
; RUN: -plugin-opt=O1 -r -o %t.o %t.bc
; RUN: llvm-dis < %t.o.0.4.opt.bc -o - | FileCheck --check-prefix=CHECK-O1 --check-prefix=CHECK-O1-NEWPM %s
; RUN: %gold -plugin %llvmshlibdir/LLVMgold%shlibext -plugin-opt=save-temps \
; RUN: -m elf_x86_64 --plugin-opt=new-pass-manager \
; RUN: -plugin-opt=O2 -r -o %t.o %t.bc
; RUN: llvm-dis < %t.o.0.4.opt.bc -o - | FileCheck --check-prefix=CHECK-O2 %s
; CHECK-O0: define internal void @foo(
; CHECK-O1: define internal void @foo(
; CHECK-O2-NOT: define internal void @foo(
@ -36,7 +49,9 @@ f:
end:
; CHECK-O0: phi
; CHECK-O1: select
; CHECK-O1-OLDPM: select
; The new PM does not do as many optimizations at O1
; CHECK-O1-NEWPM: phi
%r = phi i32 [ 1, %t ], [ 2, %f ]
ret i32 %r
}