1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_cityblock_distance_f16.c
* Description: Cityblock (Manhattan) distance between two vectors
*
* $Date: 23 April 2021
* $Revision: V1.9.0
*
* Target Processor: Cortex-M and Cortex-A cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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
*
* 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 "dsp/distance_functions_f16.h"
#if defined(ARM_FLOAT16_SUPPORTED)
#include <limits.h>
#include <math.h>
/**
@ingroup FloatDist
*/
/**
@defgroup Manhattan Cityblock (Manhattan) distance
Cityblock (Manhattan) distance
*/
/**
@addtogroup Manhattan
@{
*/
/**
* @brief Cityblock (Manhattan) distance between two vectors
* @param[in] pA First vector
* @param[in] pB Second vector
* @param[in] blockSize vector length
* @return distance
*
*/
#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
#include "arm_helium_utils.h"
#include "arm_vec_math.h"
float16_t arm_cityblock_distance_f16(const float16_t *pA,const float16_t *pB, uint32_t blockSize)
{
uint32_t blkCnt;
f16x8_t a, b, accumV, tempV;
accumV = vdupq_n_f16(0.0f);
blkCnt = blockSize >> 3;
while (blkCnt > 0U) {
a = vld1q(pA);
b = vld1q(pB);
tempV = vabdq(a, b);
accumV = vaddq(accumV, tempV);
pA += 8;
pB += 8;
blkCnt--;
}
/*
* tail
* (will be merged thru tail predication)
*/
blkCnt = blockSize & 7;
if (blkCnt > 0U) {
mve_pred16_t p0 = vctp16q(blkCnt);
a = vldrhq_z_f16(pA, p0);
b = vldrhq_z_f16(pB, p0);
tempV = vabdq(a, b);
accumV = vaddq_m(accumV, accumV, tempV, p0);
}
return vecAddAcrossF16Mve(accumV);
}
#else
float16_t arm_cityblock_distance_f16(const float16_t *pA,const float16_t *pB, uint32_t blockSize)
{
_Float16 accum,tmpA, tmpB;
accum = 0.0f16;
while(blockSize > 0)
{
tmpA = *pA++;
tmpB = *pB++;
accum += (_Float16)fabsf((float32_t)((_Float16)tmpA - (_Float16)tmpB));
blockSize --;
}
return(accum);
}
#endif
/**
* @} end of Manhattan group
*/
#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
|
