blob: 52f5f8eb2f0d1fe240a1de8a401fa18ef6fc630b (
plain)
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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* Copyright (C) 2010-2018 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.
*/
/* ----------------------------------------------------------------------
* Project: CMSIS NN Library
* Title: arm_q7_to_q15_reordered_no_shift.c
* Description: Converts the elements of the Q7 vector to reordered Q15 vector without left-shift
*
* $Date: 17. January 2018
* $Revision: V.1.0.0
*
* Target Processor: Cortex-M cores
*
* -------------------------------------------------------------------- */
#include "arm_nnsupportfunctions.h"
/**
* @ingroup groupSupport
*/
/**
* @addtogroup nndata_convert
* @{
*/
/**
* @brief Converts the elements of the Q7 vector to reordered Q15 vector without left-shift
* @param[in] *pSrc points to the Q7 input vector
* @param[out] *pDst points to the Q15 output vector
* @param[in] blockSize length of the input vector
* @return none.
*
* @details
*
* This function does the q7 to q15 expansion with re-ordering
*
* <pre>
* | A1 | A2 | A3 | A4 |
*
* 0 7 8 15 16 23 24 31
* </pre>
*
* is converted into:
*
* <pre>
* | A1 | A3 | and | A2 | A4 |
*
* 0 15 16 31 0 15 16 31
* </pre>
*
*
* This looks strange but is natural considering how sign-extension is done at
* assembly level.
*
* The expansion of other other oprand will follow the same rule so that the end
* results are the same.
*
* The tail (i.e., last (N % 4) elements) will still be in original order.
*
*/
void arm_q7_to_q15_reordered_no_shift(const q7_t * pSrc, q15_t * pDst, uint32_t blockSize)
{
const q7_t *pIn = pSrc; /* Src pointer */
uint32_t blkCnt; /* loop counter */
#ifndef ARM_MATH_CM0_FAMILY
q31_t in;
q31_t in1, in2;
/* Run the below code for Cortex-M4 and Cortex-M3 */
/*loop Unrolling */
blkCnt = blockSize >> 2u;
/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
** a second loop below computes the remaining 1 to 3 samples. */
while (blkCnt > 0u)
{
/* C = (q15_t) A << 8 */
/* convert from q7 to q15 and then store the results in the destination buffer */
in = *__SIMD32(pIn)++;
/* rotatate in by 8 and extend two q7_t values to q15_t values */
in1 = __SXTB16(__ROR(in, 8));
/* extend remainig two q7_t values to q15_t values */
in2 = __SXTB16(in);
#ifndef ARM_MATH_BIG_ENDIAN
*__SIMD32(pDst)++ = in2;
*__SIMD32(pDst)++ = in1;
#else
*__SIMD32(pDst)++ = in1;
*__SIMD32(pDst)++ = in2;
#endif
/* Decrement the loop counter */
blkCnt--;
}
/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
** No loop unrolling is used. */
blkCnt = blockSize % 0x4u;
#else
/* Run the below code for Cortex-M0 */
/* Loop over blockSize number of values */
blkCnt = blockSize;
#endif /* #ifndef ARM_MATH_CM0_FAMILY */
while (blkCnt > 0u)
{
/* C = (q15_t) A << 8 */
/* convert from q7 to q15 and then store the results in the destination buffer */
*pDst++ = (q15_t) * pIn++;
/* Decrement the loop counter */
blkCnt--;
}
}
/**
* @} end of q7_to_x group
*/
|
