llvm/llvm/lib/Target/Hexagon/HexagonVExtract.cpp

//===- HexagonVExtract.cpp ------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// This pass will replace multiple occurrences of V6_extractw from the same
// vector register with a combination of a vector store and scalar loads.
//===----------------------------------------------------------------------===//

#include "Hexagon.h"
#include "HexagonInstrInfo.h"
#include "HexagonMachineFunctionInfo.h"
#include "HexagonRegisterInfo.h"
#include "HexagonSubtarget.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Pass.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/CommandLine.h"

#include <map>

usingnamespacellvm;

static cl::opt<unsigned> VExtractThreshold(
    "hexagon-vextract-threshold", cl::Hidden, cl::init(1),
    cl::desc("Threshold for triggering vextract replacement"));

namespace llvm {
  void initializeHexagonVExtractPass(PassRegistry& Registry);
  FunctionPass *createHexagonVExtract();
}

namespace {
  class HexagonVExtract : public MachineFunctionPass { … };

  char HexagonVExtract::ID = …;
}

INITIALIZE_PASS(…)

unsigned HexagonVExtract::genElemLoad(MachineInstr *ExtI, unsigned BaseR,
                                      MachineRegisterInfo &MRI) { … }

bool HexagonVExtract::runOnMachineFunction(MachineFunction &MF) { … }

FunctionPass *llvm::createHexagonVExtract() { … }