1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_fill_q15.c
4 * Description: Fills a constant value into 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 Fill
37 @{
38 */
39
40 /**
41 @brief Fills a constant value into a Q15 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 @return none
46 */
47 #if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
arm_fill_q15(q15_t value,q15_t * pDst,uint32_t blockSize)48 void arm_fill_q15(
49 q15_t value,
50 q15_t * pDst,
51 uint32_t blockSize)
52 {
53 uint32_t blkCnt;
54 blkCnt = blockSize >> 3;
55 while (blkCnt > 0U)
56 {
57
58 vstrhq_s16(pDst,vdupq_n_s16(value));
59 /*
60 * Decrement the blockSize loop counter
61 * Advance vector source and destination pointers
62 */
63 pDst += 8;
64 blkCnt --;
65 }
66
67 blkCnt = blockSize & 7;
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
80 #else
arm_fill_q15(q15_t value,q15_t * pDst,uint32_t blockSize)81 void arm_fill_q15(
82 q15_t value,
83 q15_t * pDst,
84 uint32_t blockSize)
85 {
86 uint32_t blkCnt; /* Loop counter */
87
88 #if defined (ARM_MATH_LOOPUNROLL)
89 q31_t packedValue; /* value packed to 32 bits */
90
91 /* Packing two 16 bit values to 32 bit value in order to use SIMD */
92 packedValue = __PKHBT(value, value, 16U);
93
94 /* Loop unrolling: Compute 4 outputs at a time */
95 blkCnt = blockSize >> 2U;
96
97 while (blkCnt > 0U)
98 {
99 /* C = value */
100
101 /* fill 2 times 2 samples at a time */
102 write_q15x2_ia (&pDst, packedValue);
103 write_q15x2_ia (&pDst, packedValue);
104
105 /* Decrement loop counter */
106 blkCnt--;
107 }
108
109 /* Loop unrolling: Compute remaining outputs */
110 blkCnt = blockSize % 0x4U;
111
112 #else
113
114 /* Initialize blkCnt with number of samples */
115 blkCnt = blockSize;
116
117 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
118
119 while (blkCnt > 0U)
120 {
121 /* C = value */
122
123 /* Fill value in destination buffer */
124 *pDst++ = value;
125
126 /* Decrement loop counter */
127 blkCnt--;
128 }
129 }
130 #endif /* defined(ARM_MATH_MVEI) */
131
132 /**
133 @} end of Fill group
134 */
135