chore: import upstream snapshot with attribution

paddle/phi/kernels/strings/cpu/strings_copy_kernel.cc

@@ -0,0 +1,62 @@
+/* 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/strings/strings_copy_kernel.h"
+
+#include "glog/logging.h"
+#include "paddle/phi/common/pstring.h"
+#include "paddle/phi/core/kernel_registry.h"
+
+namespace phi::strings {
+
+template <typename Context>
+void Copy(const Context& dev_ctx,
+          const StringTensor& src,
+          bool blocking,
+          StringTensor* dst) {
+  auto* src_ptr = src.data();
+  const auto& src_place = src.place();
+
+  VLOG(3) << "StringTensorCopy " << src.dims() << " from " << src.place()
+          << " to " << src_place;
+
+  dst->Resize(src.dims());
+  dtype::pstring* dst_ptr = dev_ctx.template Alloc<dtype::pstring>(dst);
+
+  if (src_ptr == dst_ptr) {
+    VLOG(3) << "Skip copy the same string data async from " << src_place
+            << " to " << src_place;
+    return;
+  }
+  VLOG(4) << "src:" << src_ptr << ", dst:" << dst_ptr;
+  int64_t numel = src.numel();
+
+  if (src_place.GetType() == AllocationType::CPU) {
+    for (int64_t i = 0; i < numel; ++i) {
+      dst_ptr[i] = src_ptr[i];
+    }
+  }
+}
+#ifdef _WIN32
+template PADDLE_API void Copy<CPUContext>(const CPUContext&,
+                                          const StringTensor&,
+                                          bool,
+                                          StringTensor*);
+#endif
+}  // namespace phi::strings
+
+PD_REGISTER_KERNEL_FOR_ALL_DTYPE(strings_copy,
+                                 CPU,
+                                 ALL_LAYOUT,
+                                 phi::strings::Copy<phi::CPUContext>) {}