chore: import upstream snapshot with attribution

paddle/phi/kernels/strings/cpu/strings_lower_upper_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_lower_upper_kernel.h"
+
+#include "paddle/phi/backends/cpu/cpu_context.h"
+#include "paddle/phi/common/pstring.h"
+#include "paddle/phi/core/kernel_registry.h"
+
+namespace phi::strings {
+
+template <typename ContextT>
+void StringLowerKernel(const ContextT& dev_ctx,
+                       const StringTensor& x,
+                       bool use_utf8_encoding,
+                       StringTensor* out) {
+  StringCaseConvertKernel<AsciiCaseConverter<ContextT, AsciiToLower>,
+                          UTF8CaseConverter<ContextT, UTF8ToLower>,
+                          ContextT>()(dev_ctx, x, use_utf8_encoding, out);
+}
+
+template <typename ContextT>
+void StringUpperKernel(const ContextT& dev_ctx,
+                       const StringTensor& x,
+                       bool use_utf8_encoding,
+                       StringTensor* out) {
+  StringCaseConvertKernel<AsciiCaseConverter<ContextT, AsciiToUpper>,
+                          UTF8CaseConverter<ContextT, UTF8ToUpper>,
+                          ContextT>()(dev_ctx, x, use_utf8_encoding, out);
+}
+#ifdef _WIN32
+template PADDLE_API void StringLowerKernel<CPUContext>(const CPUContext&,
+                                                       const StringTensor& x,
+                                                       bool,
+                                                       StringTensor*);
+
+template PADDLE_API void StringUpperKernel<CPUContext>(const CPUContext&,
+                                                       const StringTensor& x,
+                                                       bool,
+                                                       StringTensor*);
+#endif
+}  // namespace phi::strings
+
+PD_REGISTER_KERNEL_FOR_ALL_DTYPE(
+    strings_lower,
+    CPU,
+    ALL_LAYOUT,
+    phi::strings::StringLowerKernel<phi::CPUContext>) {}
+
+PD_REGISTER_KERNEL_FOR_ALL_DTYPE(
+    strings_upper,
+    CPU,
+    ALL_LAYOUT,
+    phi::strings::StringUpperKernel<phi::CPUContext>) {}