move cast XPU kernel to PHI,test=kunlun (#45534)

paddle/fluid/operators/cast_op_xpu.cc

-/* Copyright (c) 2016 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. */
-
-#ifdef PADDLE_WITH_XPU
-#include <memory>
-
-#include "paddle/fluid/framework/convert_utils.h"
-#include "paddle/fluid/framework/op_registry.h"
-#include "paddle/fluid/operators/cast_op.h"
-#include "paddle/fluid/platform/float16.h"
-#include "paddle/phi/kernels/cast_kernel.h"
-#include "xpu/refactor/math.h"
-
-namespace paddle {
-namespace operators {
-
-using var_type = framework::proto::VarType;
-namespace plat = paddle::platform;
-
-template <typename DeviceContext, typename InT>
-class CastXPUKernel : public framework::OpKernel<InT> {
-  using XPUInTDType = typename XPUTypeTrait<InT>::Type;
-  using float16 = typename XPUTypeTrait<paddle::platform::float16>::Type;
-
- public:
-  void Compute(const framework::ExecutionContext& context) const override {
-    auto* in = context.Input<framework::Tensor>("X");
-    auto* out = context.Output<framework::Tensor>("Out");
-    auto out_dtype =
-        static_cast<var_type::Type>(context.Attr<int>("out_dtype"));
-
-    auto& dev_ctx = context.template device_context<DeviceContext>();
-
-    out->mutable_data(dev_ctx.GetPlace(),
-                      static_cast<framework::proto::VarType::Type>(out_dtype));
-
-    auto pt_out_dtype = framework::TransToPhiDataType(
-        static_cast<framework::proto::VarType::Type>(out_dtype));
-    // call phi kernel
-    phi::CastKernel<InT>(
-        static_cast<const typename paddle::framework::ConvertToPhiContext<
-            DeviceContext>::TYPE&>(dev_ctx),
-        *in,
-        pt_out_dtype,
-        out);
-  }
-};
-
-}  // namespace operators
-}  // namespace paddle
-
-namespace ops = paddle::operators;
-REGISTER_OP_XPU_KERNEL(
-    cast,
-    ops::CastXPUKernel<paddle::platform::XPUDeviceContext, int32_t>,
-    ops::CastXPUKernel<paddle::platform::XPUDeviceContext, float>,
-    ops::CastXPUKernel<paddle::platform::XPUDeviceContext,
-                       paddle::platform::float16>,
-    ops::CastXPUKernel<paddle::platform::XPUDeviceContext, int64_t>,
-    ops::CastXPUKernel<paddle::platform::XPUDeviceContext, bool>);
-#endif