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 */
46 #if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
arm_copy_q15(const q15_t * pSrc,q15_t * pDst,uint32_t blockSize)47 ARM_DSP_ATTRIBUTE void arm_copy_q15(
48 const q15_t * pSrc,
49 q15_t * pDst,
50 uint32_t blockSize)
51 {
52 uint32_t blkCnt;
53
54 blkCnt = blockSize >> 3;
55 while (blkCnt > 0U)
56 {
57 vstrhq_s16(pDst,vldrhq_s16(pSrc));
58 /*
59 * Decrement the blockSize loop counter
60 * Advance vector source and destination pointers
61 */
62 pSrc += 8;
63 pDst += 8;
64 blkCnt --;
65 }
66
67 blkCnt = blockSize & 7;
68 while (blkCnt > 0U)
69 {
70 /* C = A */
71
72 /* Copy and store result in destination buffer */
73 *pDst++ = *pSrc++;
74
75 /* Decrement loop counter */
76 blkCnt--;
77 }
78 }
79 #else
arm_copy_q15(const q15_t * pSrc,q15_t * pDst,uint32_t blockSize)80 ARM_DSP_ATTRIBUTE void arm_copy_q15(
81 const q15_t * pSrc,
82 q15_t * pDst,
83 uint32_t blockSize)
84 {
85 uint32_t blkCnt; /* Loop counter */
86
87 #if defined (ARM_MATH_LOOPUNROLL)
88
89 /* Loop unrolling: Compute 4 outputs at a time */
90 blkCnt = blockSize >> 2U;
91
92 while (blkCnt > 0U)
93 {
94 /* C = A */
95
96 /* read 2 times 2 samples at a time */
97 write_q15x2_ia (&pDst, read_q15x2_ia (&pSrc));
98 write_q15x2_ia (&pDst, read_q15x2_ia (&pSrc));
99
100 /* Decrement loop counter */
101 blkCnt--;
102 }
103
104 /* Loop unrolling: Compute remaining outputs */
105 blkCnt = blockSize % 0x4U;
106
107 #else
108
109 /* Initialize blkCnt with number of samples */
110 blkCnt = blockSize;
111
112 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
113
114 while (blkCnt > 0U)
115 {
116 /* C = A */
117
118 /* Copy and store result in destination buffer */
119 *pDst++ = *pSrc++;
120
121 /* Decrement loop counter */
122 blkCnt--;
123 }
124 }
125 #endif /* defined(ARM_MATH_MVEI) */
126
127 /**
128 @} end of BasicCopy group
129 */
130
