forked from OSchip/llvm-project
86 lines
3.2 KiB
C++
86 lines
3.2 KiB
C++
//===--------------------- InstrBuilder.h -----------------------*- 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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/// \file
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///
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/// A builder class for instructions that are statically analyzed by llvm-mca.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_MCA_INSTRBUILDER_H
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#define LLVM_TOOLS_LLVM_MCA_INSTRBUILDER_H
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#include "Instruction.h"
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#include "Support.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/MC/MCInstrAnalysis.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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namespace mca {
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class DispatchUnit;
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/// A builder class that knows how to construct Instruction objects.
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///
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/// Every llvm-mca Instruction is described by an object of class InstrDesc.
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/// An InstrDesc describes which registers are read/written by the instruction,
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/// as well as the instruction latency and hardware resources consumed.
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///
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/// This class is used by the tool to construct Instructions and instruction
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/// descriptors (i.e. InstrDesc objects).
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/// Information from the machine scheduling model is used to identify processor
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/// resources that are consumed by an instruction.
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class InstrBuilder {
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const llvm::MCSubtargetInfo &STI;
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const llvm::MCInstrInfo &MCII;
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const llvm::MCRegisterInfo &MRI;
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const llvm::MCInstrAnalysis &MCIA;
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llvm::MCInstPrinter &MCIP;
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llvm::SmallVector<uint64_t, 8> ProcResourceMasks;
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llvm::DenseMap<unsigned short, std::unique_ptr<const InstrDesc>> Descriptors;
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llvm::DenseMap<const llvm::MCInst *, std::unique_ptr<const InstrDesc>>
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VariantDescriptors;
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const InstrDesc &createInstrDescImpl(const llvm::MCInst &MCI);
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InstrBuilder(const InstrBuilder &) = delete;
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InstrBuilder &operator=(const InstrBuilder &) = delete;
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void populateWrites(InstrDesc &ID, const llvm::MCInst &MCI,
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unsigned SchedClassID);
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void populateReads(InstrDesc &ID, const llvm::MCInst &MCI,
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unsigned SchedClassID);
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public:
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InstrBuilder(const llvm::MCSubtargetInfo &sti, const llvm::MCInstrInfo &mcii,
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const llvm::MCRegisterInfo &mri,
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const llvm::MCInstrAnalysis &mcia, llvm::MCInstPrinter &mcip)
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: STI(sti), MCII(mcii), MRI(mri), MCIA(mcia), MCIP(mcip),
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ProcResourceMasks(STI.getSchedModel().getNumProcResourceKinds()) {
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computeProcResourceMasks(STI.getSchedModel(), ProcResourceMasks);
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}
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const InstrDesc &getOrCreateInstrDesc(const llvm::MCInst &MCI);
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// Returns an array of processor resource masks.
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// Masks are computed by function mca::computeProcResourceMasks. see
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// Support.h for a description of how masks are computed and how masks can be
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// used to solve set membership problems.
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llvm::ArrayRef<uint64_t> getProcResourceMasks() const {
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return ProcResourceMasks;
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}
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void clear() { VariantDescriptors.shrink_and_clear(); }
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std::unique_ptr<Instruction> createInstruction(const llvm::MCInst &MCI);
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};
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} // namespace mca
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#endif
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