chore: import upstream snapshot with attribution

paddle/phi/kernels/cpu/cast_kernel.cc

@@ -0,0 +1,89 @@
+//   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/cast_kernel.h"
+
+#include "paddle/phi/core/kernel_registry.h"
+#include "paddle/phi/core/visit_type.h"
+#include "paddle/phi/kernels/cpu/cast_impl.h"
+
+namespace phi {
+
+template <typename T, typename Context>
+void CastKernel(const Context& dev_ctx,
+                const DenseTensor& x,
+                DataType out_dtype,
+                DenseTensor* out) {
+  if (x.dtype() == out_dtype) {
+    if (x.dims() == make_ddim({-1})) {
+      *out = x;
+      return;
+    }
+    if (!out->IsSharedWith(x)) {
+      Copy(dev_ctx, x, dev_ctx.GetPlace(), false, out);
+    }
+    return;
+  }
+
+  if (out->IsSharedWith(x)) {
+    PD_VISIT_ALL_CPU_TYPES(out_dtype, "CastInplaceKernelImpl", ([&] {
+                             CastInplaceKernelImpl<T, data_t>(
+                                 dev_ctx, x, out_dtype, out);
+                           }));
+  } else {
+    PD_VISIT_ALL_CPU_TYPES(out_dtype, "CastKernelImpl", ([&] {
+                             CastKernelImpl<T, data_t>(
+                                 dev_ctx, x, out_dtype, out);
+                           }));
+  }
+}
+#ifdef _WIN32
+INSTANTIATE_CAST_KERNEL(float, CPUContext)
+INSTANTIATE_CAST_KERNEL(double, CPUContext)
+INSTANTIATE_CAST_KERNEL(int, CPUContext)
+INSTANTIATE_CAST_KERNEL(int64_t, CPUContext)
+INSTANTIATE_CAST_KERNEL(uint8_t, CPUContext)
+INSTANTIATE_CAST_KERNEL(uint16_t, CPUContext)
+INSTANTIATE_CAST_KERNEL(uint32_t, CPUContext)
+INSTANTIATE_CAST_KERNEL(uint64_t, CPUContext)
+INSTANTIATE_CAST_KERNEL(bool, CPUContext)
+INSTANTIATE_CAST_KERNEL(int16_t, CPUContext)
+INSTANTIATE_CAST_KERNEL(float16, CPUContext)
+INSTANTIATE_CAST_KERNEL(bfloat16, CPUContext)
+#endif
+}  // namespace phi
+
+PD_REGISTER_KERNEL(cast,
+                   CPU,
+                   ALL_LAYOUT,
+                   phi::CastKernel,
+                   float,
+                   double,
+                   int,
+                   int64_t,
+                   int16_t,
+                   bool,
+                   int8_t,
+                   uint8_t,
+                   uint16_t,
+                   uint32_t,
+                   uint64_t,
+                   phi::float8_e4m3fn,
+                   phi::float8_e5m2,
+                   phi::float16,
+                   phi::bfloat16,
+                   phi::complex64,
+                   phi::complex128) {
+  kernel->OutputAt(0).SetDataType(phi::DataType::UNDEFINED);
+}