1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_copy_q31.c
4 * Description: Copies the elements of a Q31 vector
5 *
6 * $Date: 27. January 2017
7 * $Revision: V.1.5.1
8 *
9 * Target Processor: Cortex-M cores
10 * -------------------------------------------------------------------- */
11 /*
12 * Copyright (C) 2010-2017 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 "arm_math.h"
30
31 /**
32 * @ingroup groupSupport
33 */
34
35 /**
36 * @addtogroup copy
37 * @{
38 */
39
40 /**
41 * @brief Copies the elements of a Q31 vector.
42 * @param[in] *pSrc points to input vector
43 * @param[out] *pDst points to output vector
44 * @param[in] blockSize length of the input vector
45 * @return none.
46 *
47 */
48
arm_copy_q31(q31_t * pSrc,q31_t * pDst,uint32_t blockSize)49 void arm_copy_q31(
50 q31_t * pSrc,
51 q31_t * pDst,
52 uint32_t blockSize)
53 {
54 uint32_t blkCnt; /* loop counter */
55
56
57 #if defined (ARM_MATH_DSP)
58
59 /* Run the below code for Cortex-M4 and Cortex-M3 */
60 q31_t in1, in2, in3, in4;
61
62 /*loop Unrolling */
63 blkCnt = blockSize >> 2u;
64
65 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
66 ** a second loop below computes the remaining 1 to 3 samples. */
67 while (blkCnt > 0u)
68 {
69 /* C = A */
70 /* Copy and then store the values in the destination buffer */
71 in1 = *pSrc++;
72 in2 = *pSrc++;
73 in3 = *pSrc++;
74 in4 = *pSrc++;
75
76 *pDst++ = in1;
77 *pDst++ = in2;
78 *pDst++ = in3;
79 *pDst++ = in4;
80
81 /* Decrement the loop counter */
82 blkCnt--;
83 }
84
85 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
86 ** No loop unrolling is used. */
87 blkCnt = blockSize % 0x4u;
88
89 #else
90
91 /* Run the below code for Cortex-M0 */
92
93 /* Loop over blockSize number of values */
94 blkCnt = blockSize;
95
96 #endif /* #if defined (ARM_MATH_DSP) */
97
98 while (blkCnt > 0u)
99 {
100 /* C = A */
101 /* Copy and then store the value in the destination buffer */
102 *pDst++ = *pSrc++;
103
104 /* Decrement the loop counter */
105 blkCnt--;
106 }
107 }
108
109 /**
110 * @} end of BasicCopy group
111 */
112