llvm/llvm/lib/Target/Hexagon/HexagonGenExtract.cpp

//===- HexagonGenExtract.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
//
//===----------------------------------------------------------------------===//

#include "llvm/ADT/APInt.h"
#include "llvm/ADT/GraphTraits.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicsHexagon.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Value.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include <algorithm>
#include <cstdint>
#include <iterator>

usingnamespacellvm;

static cl::opt<unsigned> ExtractCutoff("extract-cutoff", cl::init(~0U),
  cl::Hidden, cl::desc("Cutoff for generating \"extract\""
  " instructions"));

// This prevents generating extract instructions that have the offset of 0.
// One of the reasons for "extract" is to put a sequence of bits in a regis-
// ter, starting at offset 0 (so that these bits can then be used by an
// "insert"). If the bits are already at offset 0, it is better not to gene-
// rate "extract", since logical bit operations can be merged into compound
// instructions (as opposed to "extract").
static cl::opt<bool> NoSR0("extract-nosr0", cl::init(true), cl::Hidden,
  cl::desc("No extract instruction with offset 0"));

static cl::opt<bool> NeedAnd("extract-needand", cl::init(true), cl::Hidden,
  cl::desc("Require & in extract patterns"));

namespace llvm {

void initializeHexagonGenExtractPass(PassRegistry&);
FunctionPass *createHexagonGenExtract();

} // end namespace llvm

namespace {

  class HexagonGenExtract : public FunctionPass { … };

} // end anonymous namespace

char HexagonGenExtract::ID = …;

INITIALIZE_PASS_BEGIN(HexagonGenExtract, "hextract", "Hexagon generate "
  "\"extract\" instructions", false, false)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_END(HexagonGenExtract, "hextract", "Hexagon generate "
  "\"extract\" instructions", false, false)

bool HexagonGenExtract::convert(Instruction *In) { … }

bool HexagonGenExtract::visitBlock(BasicBlock *B) { … }

bool HexagonGenExtract::runOnFunction(Function &F) { … }

FunctionPass *llvm::createHexagonGenExtract() { … }