1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_fill_q7.c
4 * Description: Fills a constant value into a Q7 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 Fill
37 @{
38 */
39
40 /**
41 @brief Fills a constant value into a Q7 vector.
42 @param[in] value input value to be filled
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_fill_q7(q7_t value,q7_t * pDst,uint32_t blockSize)47 ARM_DSP_ATTRIBUTE void arm_fill_q7(
48 q7_t value,
49 q7_t * pDst,
50 uint32_t blockSize)
51 {
52 uint32_t blkCnt;
53
54 blkCnt = blockSize >> 4;
55 while (blkCnt > 0U)
56 {
57
58 vstrbq_s8(pDst,vdupq_n_s8(value));
59 /*
60 * Decrement the blockSize loop counter
61 * Advance vector source and destination pointers
62 */
63 pDst += 16;
64 blkCnt --;
65 }
66
67 blkCnt = blockSize & 0xF;
68 while (blkCnt > 0U)
69 {
70 /* C = value */
71
72 /* Fill value in destination buffer */
73 *pDst++ = value;
74
75 /* Decrement loop counter */
76 blkCnt--;
77 }
78 }
79 #else
arm_fill_q7(q7_t value,q7_t * pDst,uint32_t blockSize)80 ARM_DSP_ATTRIBUTE void arm_fill_q7(
81 q7_t value,
82 q7_t * pDst,
83 uint32_t blockSize)
84 {
85 uint32_t blkCnt; /* Loop counter */
86
87 #if defined (ARM_MATH_LOOPUNROLL)
88 q31_t packedValue; /* value packed to 32 bits */
89
90 /* Packing four 8 bit values to 32 bit value in order to use SIMD */
91 packedValue = __PACKq7(value, value, value, value);
92
93 /* Loop unrolling: Compute 4 outputs at a time */
94 blkCnt = blockSize >> 2U;
95
96 while (blkCnt > 0U)
97 {
98 /* C = value */
99
100 /* fill 4 samples at a time */
101 write_q7x4_ia (&pDst, packedValue);
102
103 /* Decrement loop counter */
104 blkCnt--;
105 }
106
107 /* Loop unrolling: Compute remaining outputs */
108 blkCnt = blockSize % 0x4U;
109
110 #else
111
112 /* Initialize blkCnt with number of samples */
113 blkCnt = blockSize;
114
115 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
116
117 while (blkCnt > 0U)
118 {
119 /* C = value */
120
121 /* Fill value in destination buffer */
122 *pDst++ = value;
123
124 /* Decrement loop counter */
125 blkCnt--;
126 }
127 }
128 #endif /* defined(ARM_MATH_MVEI) */
129
130 /**
131 @} end of Fill group
132 */
133
