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 */
46 #if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
arm_fill_q15(q15_t value,q15_t * pDst,uint32_t blockSize)47 ARM_DSP_ATTRIBUTE void arm_fill_q15(
48 q15_t value,
49 q15_t * pDst,
50 uint32_t blockSize)
51 {
52 uint32_t blkCnt;
53 blkCnt = blockSize >> 3;
54 while (blkCnt > 0U)
55 {
56
57 vstrhq_s16(pDst,vdupq_n_s16(value));
58 /*
59 * Decrement the blockSize loop counter
60 * Advance vector source and destination pointers
61 */
62 pDst += 8;
63 blkCnt --;
64 }
65
66 blkCnt = blockSize & 7;
67 while (blkCnt > 0U)
68 {
69 /* C = value */
70
71 /* Fill value in destination buffer */
72 *pDst++ = value;
73
74 /* Decrement loop counter */
75 blkCnt--;
76 }
77 }
78
79 #else
arm_fill_q15(q15_t value,q15_t * pDst,uint32_t blockSize)80 ARM_DSP_ATTRIBUTE void arm_fill_q15(
81 q15_t value,
82 q15_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 two 16 bit values to 32 bit value in order to use SIMD */
91 packedValue = __PKHBT(value, value, 16U);
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 2 times 2 samples at a time */
101 write_q15x2_ia (&pDst, packedValue);
102 write_q15x2_ia (&pDst, packedValue);
103
104 /* Decrement loop counter */
105 blkCnt--;
106 }
107
108 /* Loop unrolling: Compute remaining outputs */
109 blkCnt = blockSize % 0x4U;
110
111 #else
112
113 /* Initialize blkCnt with number of samples */
114 blkCnt = blockSize;
115
116 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
117
118 while (blkCnt > 0U)
119 {
120 /* C = value */
121
122 /* Fill value in destination buffer */
123 *pDst++ = value;
124
125 /* Decrement loop counter */
126 blkCnt--;
127 }
128 }
129 #endif /* defined(ARM_MATH_MVEI) */
130
131 /**
132 @} end of Fill group
133 */
134
