1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_copy_q15.c
4 * Description: Copies the elements of a Q15 vector
5 *
6 * $Date: 23 April 2021
7 * $Revision: V1.9.0
8 *
9 * Target Processor: Cortex-M and Cortex-A cores
10 * -------------------------------------------------------------------- */
11 /*
12 * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
13 *
14 * SPDX-License-Identifier: Apache-2.0
15 *
16 * Licensed under the Apache License, Version 2.0 (the License); you may
17 * not use this file except in compliance with the License.
18 * You may obtain a copy of the License at
19 *
20 * www.apache.org/licenses/LICENSE-2.0
21 *
22 * Unless required by applicable law or agreed to in writing, software
23 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
24 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
25 * See the License for the specific language governing permissions and
26 * limitations under the License.
27 */
28
29 #include "dsp/support_functions.h"
30
31 /**
32 @ingroup groupSupport
33 */
34
35 /**
36 @addtogroup copy
37 @{
38 */
39
40 /**
41 @brief Copies the elements of a Q15 vector.
42 @param[in] pSrc points to input vector
43 @param[out] pDst points to output vector
44 @param[in] blockSize number of samples in each vector
45 @return none
46 */
47 #if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
arm_copy_q15(const q15_t * pSrc,q15_t * pDst,uint32_t blockSize)48 void arm_copy_q15(
49 const q15_t * pSrc,
50 q15_t * pDst,
51 uint32_t blockSize)
52 {
53 uint32_t blkCnt;
54
55 blkCnt = blockSize >> 3;
56 while (blkCnt > 0U)
57 {
58 vstrhq_s16(pDst,vldrhq_s16(pSrc));
59 /*
60 * Decrement the blockSize loop counter
61 * Advance vector source and destination pointers
62 */
63 pSrc += 8;
64 pDst += 8;
65 blkCnt --;
66 }
67
68 blkCnt = blockSize & 7;
69 while (blkCnt > 0U)
70 {
71 /* C = A */
72
73 /* Copy and store result in destination buffer */
74 *pDst++ = *pSrc++;
75
76 /* Decrement loop counter */
77 blkCnt--;
78 }
79 }
80 #else
arm_copy_q15(const q15_t * pSrc,q15_t * pDst,uint32_t blockSize)81 void arm_copy_q15(
82 const q15_t * pSrc,
83 q15_t * pDst,
84 uint32_t blockSize)
85 {
86 uint32_t blkCnt; /* Loop counter */
87
88 #if defined (ARM_MATH_LOOPUNROLL)
89
90 /* Loop unrolling: Compute 4 outputs at a time */
91 blkCnt = blockSize >> 2U;
92
93 while (blkCnt > 0U)
94 {
95 /* C = A */
96
97 /* read 2 times 2 samples at a time */
98 write_q15x2_ia (&pDst, read_q15x2_ia ((q15_t **) &pSrc));
99 write_q15x2_ia (&pDst, read_q15x2_ia ((q15_t **) &pSrc));
100
101 /* Decrement loop counter */
102 blkCnt--;
103 }
104
105 /* Loop unrolling: Compute remaining outputs */
106 blkCnt = blockSize % 0x4U;
107
108 #else
109
110 /* Initialize blkCnt with number of samples */
111 blkCnt = blockSize;
112
113 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
114
115 while (blkCnt > 0U)
116 {
117 /* C = A */
118
119 /* Copy and store result in destination buffer */
120 *pDst++ = *pSrc++;
121
122 /* Decrement loop counter */
123 blkCnt--;
124 }
125 }
126 #endif /* defined(ARM_MATH_MVEI) */
127
128 /**
129 @} end of BasicCopy group
130 */
131
