// Copyright (c) 2022 PaddlePaddle 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 "paddle/phi/kernels/cast_grad_kernel.h"
#include "paddle/phi/kernels/cast_kernel.h"

#include "paddle/phi/core/kernel_registry.h"
#include "paddle/phi/core/visit_type.h"
#include "paddle/phi/kernels/gpu/cast_impl.h"

namespace phi {

template <typename T, typename Context>
void CastGradKernel(const Context& dev_ctx,
                    const DenseTensor& x,
                    const DenseTensor& out_grad,
                    DenseTensor* x_grad) {
  CastKernel<T, Context>(dev_ctx, out_grad, x.dtype(), x_grad);
}

}  // namespace phi

#define PTEN_REGISTER_CAST_CUDA_BASE_TYPE(op_name, ...)        \
  PD_REGISTER_KERNEL(cast_grad,                                \
                     GPU,                                      \
                     ALL_LAYOUT,                               \
                     phi::CastGradKernel,                      \
                     float,                                    \
                     double,                                   \
                     int,                                      \
                     int64_t,                                  \
                     int16_t,                                  \
                     bool,                                     \
                     uint8_t,                                  \
                     phi::dtype::float16,                      \
                     phi::dtype::complex<float>,               \
                     phi::dtype::complex<double>,              \
                     ##__VA_ARGS__) {                          \
    kernel->OutputAt(0).SetDataType(phi::DataType::UNDEFINED); \
  }

PTEN_REGISTER_CAST_CUDA_BASE_TYPE(cast_grad, phi::dtype::bfloat16)
