77 lines
2.7 KiB
C
77 lines
2.7 KiB
C
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//===--------------------- InstrBuilder.h -----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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_MCA_INSTRBUILDER_H
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#define LLVM_MCA_INSTRBUILDER_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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#include "llvm/MCA/Instruction.h"
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#include "llvm/MCA/Support.h"
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#include "llvm/Support/Error.h"
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namespace llvm {
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namespace mca {
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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 MCSubtargetInfo &STI;
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const MCInstrInfo &MCII;
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const MCRegisterInfo &MRI;
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const MCInstrAnalysis *MCIA;
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SmallVector<uint64_t, 8> ProcResourceMasks;
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DenseMap<unsigned short, std::unique_ptr<const InstrDesc>> Descriptors;
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DenseMap<const MCInst *, std::unique_ptr<const InstrDesc>> VariantDescriptors;
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bool FirstCallInst;
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bool FirstReturnInst;
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Expected<const InstrDesc &> createInstrDescImpl(const MCInst &MCI);
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Expected<const InstrDesc &> getOrCreateInstrDesc(const 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 MCInst &MCI, unsigned SchedClassID);
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void populateReads(InstrDesc &ID, const MCInst &MCI, unsigned SchedClassID);
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Error verifyInstrDesc(const InstrDesc &ID, const MCInst &MCI) const;
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public:
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InstrBuilder(const MCSubtargetInfo &STI, const MCInstrInfo &MCII,
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const MCRegisterInfo &RI, const MCInstrAnalysis *IA);
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void clear() {
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VariantDescriptors.shrink_and_clear();
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FirstCallInst = true;
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FirstReturnInst = true;
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}
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Expected<std::unique_ptr<Instruction>> createInstruction(const MCInst &MCI);
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};
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} // namespace mca
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} // namespace llvm
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#endif // LLVM_MCA_INSTRBUILDER_H
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