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72b0e155fd
Summary:
Currently llvm::SplitModule as the first step globalizes all local objects, which might not be desirable in some scenarios.
This change adds a new flag to llvm::SplitModule that uses SCC approach to search for a balanced partition without the need to externalize symbols.
Such partition might not be possible or fully balanced for a given number of partitions, and is a function of the module properties (global/local dependencies within the module).
Joint development Tobias Edler von Koch (tobias@codeaurora.org) and Sergei Larin (slarin@codeaurora.org)
Subscribers: llvm-commits, joker.eph
Differential Revision: http://reviews.llvm.org/D16124
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258083 91177308-0d34-0410-b5e6-96231b3b80d8
45 lines
1.6 KiB
C++
45 lines
1.6 KiB
C++
//===-- llvm/CodeGen/ParallelCG.h - Parallel code generation ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header declares functions that can be used for parallel code generation.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_PARALLELCG_H
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#define LLVM_CODEGEN_PARALLELCG_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/Support/CodeGen.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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class Module;
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class TargetOptions;
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class raw_pwrite_stream;
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/// Split M into OSs.size() partitions, and generate code for each. Writes
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/// OSs.size() output files to the output streams in OSs. The resulting output
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/// files if linked together are intended to be equivalent to the single output
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/// file that would have been code generated from M.
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///
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/// \returns M if OSs.size() == 1, otherwise returns std::unique_ptr<Module>().
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std::unique_ptr<Module>
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splitCodeGen(std::unique_ptr<Module> M, ArrayRef<raw_pwrite_stream *> OSs,
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StringRef CPU, StringRef Features, const TargetOptions &Options,
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Reloc::Model RM = Reloc::Default,
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CodeModel::Model CM = CodeModel::Default,
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CodeGenOpt::Level OL = CodeGenOpt::Default,
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TargetMachine::CodeGenFileType FT = TargetMachine::CGFT_ObjectFile,
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bool PreserveLocals = false);
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} // namespace llvm
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#endif
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