1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_fill_q31.c
4 * Description: Fills a constant value into 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 Fill
37 * @{
38 */
39
40 /**
41 * @brief Fills a constant value into a Q31 vector.
42 * @param[in] value input value to be filled
43 * @param[out] *pDst points to output vector
44 * @param[in] blockSize length of the output vector
45 * @return none.
46 *
47 */
48
arm_fill_q31(q31_t value,q31_t * pDst,uint32_t blockSize)49 void arm_fill_q31(
50 q31_t value,
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 = value;
61 q31_t in2 = value;
62 q31_t in3 = value;
63 q31_t in4 = value;
64
65 /*loop Unrolling */
66 blkCnt = blockSize >> 2u;
67
68 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
69 ** a second loop below computes the remaining 1 to 3 samples. */
70 while (blkCnt > 0u)
71 {
72 /* C = value */
73 /* Fill the value in the destination buffer */
74 *pDst++ = in1;
75 *pDst++ = in2;
76 *pDst++ = in3;
77 *pDst++ = in4;
78
79 /* Decrement the loop counter */
80 blkCnt--;
81 }
82
83 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
84 ** No loop unrolling is used. */
85 blkCnt = blockSize % 0x4u;
86
87 #else
88
89 /* Run the below code for Cortex-M0 */
90
91 /* Loop over blockSize number of values */
92 blkCnt = blockSize;
93
94 #endif /* #if defined (ARM_MATH_DSP) */
95
96 while (blkCnt > 0u)
97 {
98 /* C = value */
99 /* Fill the value in the destination buffer */
100 *pDst++ = value;
101
102 /* Decrement the loop counter */
103 blkCnt--;
104 }
105 }
106
107 /**
108 * @} end of Fill group
109 */
110