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Diffstat (limited to 'lib/Target/RISCV/RISCVInstructionSelector.cpp')
-rw-r--r-- | lib/Target/RISCV/RISCVInstructionSelector.cpp | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/lib/Target/RISCV/RISCVInstructionSelector.cpp b/lib/Target/RISCV/RISCVInstructionSelector.cpp new file mode 100644 index 000000000000..5bd09a546114 --- /dev/null +++ b/lib/Target/RISCV/RISCVInstructionSelector.cpp @@ -0,0 +1,103 @@ +//===-- RISCVInstructionSelector.cpp -----------------------------*- C++ -*-==// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +/// \file +/// This file implements the targeting of the InstructionSelector class for +/// RISCV. +/// \todo This should be generated by TableGen. +//===----------------------------------------------------------------------===// + +#include "RISCVRegisterBankInfo.h" +#include "RISCVSubtarget.h" +#include "RISCVTargetMachine.h" +#include "llvm/CodeGen/GlobalISel/InstructionSelector.h" +#include "llvm/CodeGen/GlobalISel/InstructionSelectorImpl.h" +#include "llvm/Support/Debug.h" + +#define DEBUG_TYPE "riscv-isel" + +using namespace llvm; + +#define GET_GLOBALISEL_PREDICATE_BITSET +#include "RISCVGenGlobalISel.inc" +#undef GET_GLOBALISEL_PREDICATE_BITSET + +namespace { + +class RISCVInstructionSelector : public InstructionSelector { +public: + RISCVInstructionSelector(const RISCVTargetMachine &TM, + const RISCVSubtarget &STI, + const RISCVRegisterBankInfo &RBI); + + bool select(MachineInstr &I) override; + static const char *getName() { return DEBUG_TYPE; } + +private: + bool selectImpl(MachineInstr &I, CodeGenCoverage &CoverageInfo) const; + + const RISCVSubtarget &STI; + const RISCVInstrInfo &TII; + const RISCVRegisterInfo &TRI; + const RISCVRegisterBankInfo &RBI; + + // FIXME: This is necessary because DAGISel uses "Subtarget->" and GlobalISel + // uses "STI." in the code generated by TableGen. We need to unify the name of + // Subtarget variable. + const RISCVSubtarget *Subtarget = &STI; + +#define GET_GLOBALISEL_PREDICATES_DECL +#include "RISCVGenGlobalISel.inc" +#undef GET_GLOBALISEL_PREDICATES_DECL + +#define GET_GLOBALISEL_TEMPORARIES_DECL +#include "RISCVGenGlobalISel.inc" +#undef GET_GLOBALISEL_TEMPORARIES_DECL +}; + +} // end anonymous namespace + +#define GET_GLOBALISEL_IMPL +#include "RISCVGenGlobalISel.inc" +#undef GET_GLOBALISEL_IMPL + +RISCVInstructionSelector::RISCVInstructionSelector( + const RISCVTargetMachine &TM, const RISCVSubtarget &STI, + const RISCVRegisterBankInfo &RBI) + : InstructionSelector(), STI(STI), TII(*STI.getInstrInfo()), + TRI(*STI.getRegisterInfo()), RBI(RBI), + +#define GET_GLOBALISEL_PREDICATES_INIT +#include "RISCVGenGlobalISel.inc" +#undef GET_GLOBALISEL_PREDICATES_INIT +#define GET_GLOBALISEL_TEMPORARIES_INIT +#include "RISCVGenGlobalISel.inc" +#undef GET_GLOBALISEL_TEMPORARIES_INIT +{ +} + +bool RISCVInstructionSelector::select(MachineInstr &I) { + + if (!isPreISelGenericOpcode(I.getOpcode())) { + // Certain non-generic instructions also need some special handling. + return true; + } + + if (selectImpl(I, *CoverageInfo)) + return true; + + return false; +} + +namespace llvm { +InstructionSelector * +createRISCVInstructionSelector(const RISCVTargetMachine &TM, + RISCVSubtarget &Subtarget, + RISCVRegisterBankInfo &RBI) { + return new RISCVInstructionSelector(TM, Subtarget, RBI); +} +} // end namespace llvm |