1 /*
2 * Copyright (c) Meta Platforms, Inc. and affiliates.
3 * All rights reserved.
4 *
5 * This source code is licensed under the BSD-style license found in the
6 * LICENSE file in the root directory of this source tree.
7 */
8
9 #include <executorch/kernels/portable/cpu/util/slice_util.h>
10 #include <executorch/runtime/kernel/kernel_includes.h>
11 #include <cstring>
12
13 namespace torch {
14 namespace executor {
15 namespace native {
16
17 using Tensor = exec_aten::Tensor;
18
slice_copy_Tensor_out(KernelRuntimeContext & ctx,const Tensor & in,int64_t dim,exec_aten::optional<int64_t> start_val,exec_aten::optional<int64_t> end_val,int64_t step,Tensor & out)19 Tensor& slice_copy_Tensor_out(
20 KernelRuntimeContext& ctx,
21 const Tensor& in,
22 int64_t dim,
23 exec_aten::optional<int64_t> start_val,
24 exec_aten::optional<int64_t> end_val,
25 int64_t step,
26 Tensor& out) {
27 (void)ctx;
28
29 ET_KERNEL_CHECK(
30 ctx, check_slice_copy_args(in, dim, step, out), InvalidArgument, out);
31
32 if (dim < 0) {
33 dim += in.dim();
34 }
35
36 ET_KERNEL_CHECK(
37 ctx, tensors_have_same_dim_order(in, out), InvalidArgument, out);
38
39 // If user do not set value to end_val, set end to in.size(dim) (largest
40 // value available)
41 int64_t end = end_val.has_value() ? end_val.value() : in.size(dim);
42 // If user do not set value to start_val, set start to 0 (smallest value
43 // available)
44 int64_t start = start_val.has_value() ? start_val.value() : 0;
45
46 int64_t length = adjust_slice_indices(in.size(dim), &start, &end, step);
47
48 // @lint-ignore CLANGTIDY facebook-hte-CArray
49 Tensor::SizesType target_sizes[kTensorDimensionLimit];
50 size_t target_ndim = 0;
51 get_slice_copy_out_target_size(in, dim, length, target_sizes, &target_ndim);
52 ET_KERNEL_CHECK(
53 ctx,
54 resize_tensor(out, {target_sizes, target_ndim}) == Error::Ok,
55 InvalidArgument,
56 out);
57
58 compute_slice(in, dim, start, length, step, out);
59
60 return out;
61 }
62
63 } // namespace native
64 } // namespace executor
65 } // namespace torch
66