KleidiCV Coverage Report

Directory: ./
File: kleidicv/src/arithmetics/absdiff_neon.cpp
Date: 2026-01-20 20:58:59
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1 // SPDX-FileCopyrightText: 2023 - 2024 Arm Limited and/or its affiliates <open-source-office@arm.com>
2 //
3 // SPDX-License-Identifier: Apache-2.0
4
5 #include <type_traits>
6
7 #include "kleidicv/kleidicv.h"
8 #include "kleidicv/neon.h"
9
10 namespace kleidicv::neon {
11
12 template <typename ScalarType>
13 class SaturatingAbsDiff final : public UnrollTwice {
14 public:
15 using VecTraits = neon::VecTraits<ScalarType>;
16 using VectorType = typename VecTraits::VectorType;
17
18 4590 VectorType vector_path(VectorType src_a, VectorType src_b) {
19 if constexpr (std::numeric_limits<ScalarType>::is_signed) {
20 // Results of VABD may be outside the signed range so use two
21 // saturating instructions instead.
22 3254 return vqabsq(vqsubq(src_a, src_b));
23 }
24 1336 return vabdq(src_a, src_b);
25 }
26
27 2918 ScalarType scalar_path(ScalarType src_a, ScalarType src_b) {
28 using UnsignedScalarType = std::make_unsigned_t<ScalarType>;
29 // Calculate unsigned difference and then apply saturating cast.
30 2918 UnsignedScalarType u_src_a = static_cast<UnsignedScalarType>(src_a);
31 2918 UnsignedScalarType u_src_b = static_cast<UnsignedScalarType>(src_b);
32 5836 UnsignedScalarType difference =
33
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 2918 src_a > src_b ? u_src_a - u_src_b : u_src_b - u_src_a;
34 5836 return saturating_cast<UnsignedScalarType, ScalarType>(difference);
35 2918 }
36 }; // end of class SaturatingAbsDiff<ScalarType>
37
38 template <typename T>
39 449 kleidicv_error_t saturating_absdiff(const T *src_a, size_t src_a_stride,
40 const T *src_b, size_t src_b_stride, T *dst,
41 size_t dst_stride, size_t width,
42 size_t height) {
43
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 449 CHECK_POINTER_AND_STRIDE(src_a, src_a_stride, height);
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 441 CHECK_POINTER_AND_STRIDE(src_b, src_b_stride, height);
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 433 CHECK_POINTER_AND_STRIDE(dst, dst_stride, height);
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 425 CHECK_IMAGE_SIZE(width, height);
47
48 415 SaturatingAbsDiff<T> operation;
49 415 Rectangle rect{width, height};
50 415 Rows<const T> src_a_rows{src_a, src_a_stride};
51 415 Rows<const T> src_b_rows{src_b, src_b_stride};
52 415 Rows<T> dst_rows{dst, dst_stride};
53 415 neon::apply_operation_by_rows(operation, rect, src_a_rows, src_b_rows,
54 dst_rows);
55 415 return KLEIDICV_OK;
56 449 }
57
58 #define KLEIDICV_INSTANTIATE_TEMPLATE(type) \
59 template KLEIDICV_TARGET_FN_ATTRS kleidicv_error_t saturating_absdiff<type>( \
60 const type *src_a, size_t src_a_stride, const type *src_b, \
61 size_t src_b_stride, type *dst, size_t dst_stride, size_t width, \
62 size_t height)
63
64 KLEIDICV_INSTANTIATE_TEMPLATE(uint8_t);
65 KLEIDICV_INSTANTIATE_TEMPLATE(int8_t);
66 KLEIDICV_INSTANTIATE_TEMPLATE(uint16_t);
67 KLEIDICV_INSTANTIATE_TEMPLATE(int16_t);
68 KLEIDICV_INSTANTIATE_TEMPLATE(int32_t);
69
70 } // namespace kleidicv::neon
71