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  //
  // This file declares some hooks that are injected into llvm analysis library
  // files to make them work with genx related stuff.
  //
  //===----------------------------------------------------------------------===//
  
  
  #ifndef LLVM_GENX_ANALYSIS_H
  #define LLVM_GENX_ANALYSIS_H
  
  namespace llvm {
  
  template <typename T> class ArrayRef;
  class CallInst;
  class Constant;
  class DataLayout;
  class Instruction;
  class ImmutableCallSite;
  class Type;
  class Use;
  class Value;
  class Function;
  
  /// canConstantFoldGenXIntrinsic - Return true if it is even possible to fold
  /// a call to the specified GenX intrinsic.
  bool canConstantFoldGenXIntrinsic(unsigned IID);
  
  /// ConstantFoldGenXIntrinsic - Attempt to constant fold a call to the
  /// specified GenX intrinsic with the specified arguments, returning null if
  /// unsuccessful.
  Constant *ConstantFoldGenXIntrinsic(unsigned IID, Type *RetTy,
                                      ArrayRef<Constant *> Operands,
                                      Instruction *CSInst, const DataLayout &DL);
  
  /// ConstantFoldGenX - Attempt to constant fold genx-related instruction (intrinsic).
  /// This function tries to fold operands and then tries to fold instruction
  /// itself. Returns nullptr if folding was unsuccessful.
  Constant *ConstantFoldGenX(Instruction *I, const DataLayout &DL);
  
  /// Given a GenX intrinsic and a set of arguments, see if we can fold the
  /// result.
  ///
  /// If this call could not be simplified returns null.
  Value *SimplifyGenXIntrinsic(unsigned IID, Type *RetTy, Use *ArgBegin,
                               Use *ArgEnd, const DataLayout &DL);
  
  /// Given a GenX related intruction, see if we can fold the
  /// result. This function tries simplification and then constant folding.
  ///
  /// If this instruction could not be simplified returns null.
  Value *SimplifyGenX(CallInst *I, const DataLayout &DL);
  
  // simplifyWritesWithUndefInput - removes write instrinsics (currently wrregion,
  // wrpredregion) that have undef as input value, replaces all uses with the old
  // value. If this replacement produced new context (write intrinsic's input
  // value was replaced with undef), those writes are cleaned up too. No writes
  // with undef input should be left in the function \p F as the result.
  //
  // Returns whether the function was modified.
  bool simplifyWritesWithUndefInput(Function &F);
  
  //===----------------------------------------------------------------------===//
  //
  // getValueAlignmentInBytes - calculate alignment of value
  // used in CMKernelArgOffset and GenXLiveness analysis
  // defined in CMKernelArgOffset
  //
  
  unsigned getValueAlignmentInBytes(const Value &Val, const DataLayout &DL);
  
  } // end namespace llvm
  
  #endif
  