chore: import upstream snapshot with attribution

paddle/phi/kernels/reshape_kernel.cc

@@ -0,0 +1,68 @@
+//   Copyright (c) 2021 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/reshape_kernel.h"
+
+#include "paddle/phi/backends/all_context.h"
+#include "paddle/phi/core/kernel_registry.h"
+#include "paddle/phi/core/tensor_utils.h"
+#include "paddle/phi/infermeta/unary.h"
+#include "paddle/phi/kernels/funcs/common_shape.h"
+
+namespace phi {
+
+template <typename Context>
+void ReshapeKernel(const Context& dev_ctx,
+                   const DenseTensor& x,
+                   const IntArray& shape,
+                   DenseTensor* out) {
+  MetaTensor meta_out(out);
+  InferMetaFromVecValue(x, shape.GetData(), &meta_out);
+
+  if (x.has_allocation() && x.Holder() == out->Holder()) {
+    dev_ctx.Alloc(out, x.dtype());
+    return;
+  }
+  dev_ctx.Alloc(out, x.dtype());
+  if (out->numel() == 0) return;
+
+  // TODO(chenweihang): the output dims are overwrite after copying,
+  // here we need to use copy method that only copy data
+  auto dims = out->dims();
+  phi::Copy(dev_ctx, x, dev_ctx.GetPlace(), false, out);
+  out->Resize(dims);
+  out->ResetLoD(x.lod());
+}
+
+template <typename Context>
+void ReshapeWithXShapeKernel(const Context& dev_ctx,
+                             const DenseTensor& x,
+                             const IntArray& shape,
+                             DenseTensor* out,
+                             DenseTensor* xshape UNUSED) {
+  ReshapeKernel(dev_ctx, x, shape, out);
+}
+
+}  // namespace phi
+
+PD_REGISTER_KERNEL_FOR_ALL_BACKEND_DTYPE(reshape,
+                                         ALL_LAYOUT,
+                                         phi::ReshapeKernel) {}
+// FIXME(dev): Need to deprecate it while
+// cleaning old IR system.
+PD_REGISTER_KERNEL_FOR_ALL_BACKEND_DTYPE(reshape_with_xshape,
+                                         ALL_LAYOUT,
+                                         phi::ReshapeWithXShapeKernel) {
+  kernel->OutputAt(1).SetBackend(phi::Backend::UNDEFINED);
+}