CostTable.h

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//===-- CostTable.h - Instruction Cost Table handling -----------*- 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
/// Cost tables and simple lookup functions
///
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CODEGEN_COSTTABLE_H_
#define LLVM_CODEGEN_COSTTABLE_H_
 
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGenTypes/MachineValueType.h"
#include <cstdint>
 
namespace llvm {
 
/// Cost Table Entry
template <typename CostType>
struct CostTblEntryT {
  uint16_t ISD;
  MVT::SimpleValueType Type;
  CostType Cost;
};
using CostTblEntry = CostTblEntryT<uint16_t>;
 
/// Find in cost table.
template <class CostType>
inline const CostTblEntryT<CostType> *
CostTableLookup(ArrayRef<CostTblEntryT<CostType>> Tbl, int ISD, MVT Ty) {
  auto I = find_if(Tbl, [=](const CostTblEntryT<CostType> &Entry) {
    return ISD == Entry.ISD && Ty == Entry.Type;
  });
  if (I != Tbl.end())
    return I;
 
  // Could not find an entry.
  return nullptr;
}
 
template <size_t N, class CostType>
inline const CostTblEntryT<CostType> *
CostTableLookup(const CostTblEntryT<CostType> (&Table)[N], int ISD, MVT Ty) {
  // Wrapper to fix template argument deduction failures.
  return CostTableLookup<CostType>(Table, ISD, Ty);
}
 
/// Type Conversion Cost Table
template <typename CostType>
struct TypeConversionCostTblEntryT {
  uint16_t ISD;
  MVT::SimpleValueType Dst;
  MVT::SimpleValueType Src;
  CostType Cost;
};
using TypeConversionCostTblEntry = TypeConversionCostTblEntryT<uint16_t>;
 
/// Find in type conversion cost table.
template <class CostType>
inline const TypeConversionCostTblEntryT<CostType> *
ConvertCostTableLookup(ArrayRef<TypeConversionCostTblEntryT<CostType>> Tbl,
                       int ISD, MVT Dst, MVT Src) {
  auto I =
      find_if(Tbl, [=](const TypeConversionCostTblEntryT<CostType> &Entry) {
        return ISD == Entry.ISD && Src == Entry.Src && Dst == Entry.Dst;
      });
  if (I != Tbl.end())
    return I;
 
  // Could not find an entry.
  return nullptr;
}
 
template <size_t N, class CostType>
inline const TypeConversionCostTblEntryT<CostType> *
ConvertCostTableLookup(const TypeConversionCostTblEntryT<CostType> (&Table)[N],
                       int ISD, MVT Dst, MVT Src) {
  // Wrapper to fix template argument deduction failures.
  return ConvertCostTableLookup<CostType>(Table, ISD, Dst, Src);
}
 
} // namespace llvm
 
#endif /* LLVM_CODEGEN_COSTTABLE_H_ */