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| Rev | Author | Line No. | Line |
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| 2 | mjames | 1 | /* ---------------------------------------------------------------------- |
| 2 | * Project: CMSIS DSP Library |
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| 3 | * Title: arm_fill_q15.c |
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| 4 | * Description: Fills a constant value into a Q15 vector |
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| 5 | * |
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| 6 | * $Date: 27. January 2017 |
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| 7 | * $Revision: V.1.5.1 |
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| 8 | * |
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| 9 | * Target Processor: Cortex-M cores |
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| 10 | * -------------------------------------------------------------------- */ |
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| 11 | /* |
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| 12 | * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. |
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| 13 | * |
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| 14 | * SPDX-License-Identifier: Apache-2.0 |
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| 15 | * |
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| 16 | * Licensed under the Apache License, Version 2.0 (the License); you may |
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| 17 | * not use this file except in compliance with the License. |
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| 18 | * You may obtain a copy of the License at |
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| 19 | * |
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| 20 | * www.apache.org/licenses/LICENSE-2.0 |
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| 21 | * |
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| 22 | * Unless required by applicable law or agreed to in writing, software |
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| 23 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
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| 24 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 25 | * See the License for the specific language governing permissions and |
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| 26 | * limitations under the License. |
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| 27 | */ |
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| 28 | |||
| 29 | #include "arm_math.h" |
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| 30 | |||
| 31 | /** |
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| 32 | * @ingroup groupSupport |
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| 33 | */ |
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| 34 | |||
| 35 | /** |
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| 36 | * @addtogroup Fill |
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| 37 | * @{ |
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| 38 | */ |
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| 39 | |||
| 40 | /** |
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| 41 | * @brief Fills a constant value into a Q15 vector. |
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| 42 | * @param[in] value input value to be filled |
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| 43 | * @param[out] *pDst points to output vector |
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| 44 | * @param[in] blockSize length of the output vector |
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| 45 | * @return none. |
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| 46 | * |
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| 47 | */ |
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| 48 | |||
| 49 | void arm_fill_q15( |
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| 50 | q15_t value, |
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| 51 | q15_t * pDst, |
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| 52 | uint32_t blockSize) |
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| 53 | { |
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| 54 | uint32_t blkCnt; /* loop counter */ |
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| 55 | |||
| 56 | #if defined (ARM_MATH_DSP) |
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| 57 | |||
| 58 | /* Run the below code for Cortex-M4 and Cortex-M3 */ |
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| 59 | |||
| 60 | q31_t packedValue; /* value packed to 32 bits */ |
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| 61 | |||
| 62 | |||
| 63 | /*loop Unrolling */ |
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| 64 | blkCnt = blockSize >> 2U; |
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| 65 | |||
| 66 | /* Packing two 16 bit values to 32 bit value in order to use SIMD */ |
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| 67 | packedValue = __PKHBT(value, value, 16U); |
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| 68 | |||
| 69 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
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| 70 | ** a second loop below computes the remaining 1 to 3 samples. */ |
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| 71 | while (blkCnt > 0U) |
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| 72 | { |
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| 73 | /* C = value */ |
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| 74 | /* Fill the value in the destination buffer */ |
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| 75 | *__SIMD32(pDst)++ = packedValue; |
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| 76 | *__SIMD32(pDst)++ = packedValue; |
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| 77 | |||
| 78 | /* Decrement the loop counter */ |
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| 79 | blkCnt--; |
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| 80 | } |
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| 81 | |||
| 82 | /* If the blockSize is not a multiple of 4, compute any remaining output samples here. |
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| 83 | ** No loop unrolling is used. */ |
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| 84 | blkCnt = blockSize % 0x4U; |
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| 85 | |||
| 86 | #else |
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| 87 | |||
| 88 | /* Run the below code for Cortex-M0 */ |
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| 89 | |||
| 90 | /* Loop over blockSize number of values */ |
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| 91 | blkCnt = blockSize; |
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| 92 | |||
| 93 | #endif /* #if defined (ARM_MATH_DSP) */ |
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| 94 | |||
| 95 | while (blkCnt > 0U) |
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| 96 | { |
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| 97 | /* C = value */ |
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| 98 | /* Fill the value in the destination buffer */ |
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| 99 | *pDst++ = value; |
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| 100 | |||
| 101 | /* Decrement the loop counter */ |
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| 102 | blkCnt--; |
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| 103 | } |
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| 104 | } |
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| 105 | |||
| 106 | /** |
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| 107 | * @} end of Fill group |
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| 108 | */ |