chore: import upstream snapshot with attribution

paddle/phi/kernels/gpu/complex_kernel.cu

@@ -0,0 +1,47 @@
+// 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/complex_kernel.h"
+
+#include "paddle/phi/backends/gpu/gpu_context.h"
+#include "paddle/phi/core/kernel_registry.h"
+#include "paddle/phi/kernels/impl/complex_kernel_impl.h"
+
+PD_REGISTER_KERNEL(conj,
+                   GPU,
+                   ALL_LAYOUT,
+                   phi::ConjKernel,
+                   phi::float16,
+                   phi::bfloat16,
+                   phi::complex64,
+                   phi::complex128,
+                   float,
+                   double,
+                   int,
+                   int64_t) {}
+
+PD_REGISTER_KERNEL(
+    real, GPU, ALL_LAYOUT, phi::RealKernel, phi::complex64, phi::complex128) {
+  kernel->OutputAt(0).SetDataType(phi::dtype::ToReal(kernel_key.dtype()));
+}
+
+PD_REGISTER_KERNEL(
+    imag, GPU, ALL_LAYOUT, phi::ImagKernel, phi::complex64, phi::complex128) {
+  kernel->OutputAt(0).SetDataType(phi::dtype::ToReal(kernel_key.dtype()));
+}
+
+PD_REGISTER_KERNEL(
+    complex, GPU, ALL_LAYOUT, phi::ComplexKernel, float, double) {
+  kernel->OutputAt(0).SetDataType(phi::dtype::ToComplex(kernel_key.dtype()));
+}