/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==============================================================================*/

#include "tensorflow/compiler/xla/primitive_util.h"

#include "tensorflow/core/platform/logging.h"

namespace xla {
namespace primitive_util {

template <>
PrimitiveType NativeToPrimitiveType<bool>() {
  return PRED;
}

// Unsigned integer
template <>
PrimitiveType NativeToPrimitiveType<uint8>() {
  return U8;
}

template <>
PrimitiveType NativeToPrimitiveType<uint16>() {
  return U16;
}

template <>
PrimitiveType NativeToPrimitiveType<uint32>() {
  return U32;
}

template <>
PrimitiveType NativeToPrimitiveType<uint64>() {
  return U64;
}

// Signed integer
template <>
PrimitiveType NativeToPrimitiveType<int8>() {
  return S8;
}

template <>
PrimitiveType NativeToPrimitiveType<int16>() {
  return S16;
}

template <>
PrimitiveType NativeToPrimitiveType<int32>() {
  return S32;
}

template <>
PrimitiveType NativeToPrimitiveType<int64>() {
  return S64;
}

// Floating point
template <>
PrimitiveType NativeToPrimitiveType<float>() {
  return F32;
}

template <>
PrimitiveType NativeToPrimitiveType<double>() {
  return F64;
}

template <>
PrimitiveType NativeToPrimitiveType<half>() {
  return F16;
}

bool IsFloatingPointType(PrimitiveType type) {
  return type == F16 || type == F32 || type == F64;
}

bool IsSignedIntegralType(PrimitiveType type) {
  return type == S8 || type == S16 || type == S32 || type == S64;
}

bool IsUnsignedIntegralType(PrimitiveType type) {
  return type == U8 || type == U16 || type == U32 || type == U64;
}

bool IsIntegralType(PrimitiveType type) {
  return IsUnsignedIntegralType(type) || IsSignedIntegralType(type);
}

int BitWidth(PrimitiveType type) {
  switch (type) {
    case PRED:
      return 1;

    case S8:
    case U8:
      return 8;

    case S16:
    case U16:
    case F16:
      return 16;

    case U32:
    case S32:
    case F32:
      return 32;

    case U64:
    case S64:
    case F64:
      return 64;

    case TUPLE:
      LOG(FATAL) << "TUPLE is an invalid type for BitWidth";

    case OPAQUE:
      LOG(FATAL) << "OPAQUE is an invalid type for BitWidth";

    default:
      LOG(FATAL) << "Unhandled primitive type " << type;
  }
}

}  // namespace primitive_util
}  // namespace xla
