The CMSIS DSP 5 library
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functions/BasicMathFunctions/arm_abs_f32.c@3:4098b9d3d571, 2018-06-21 (annotated)
- Committer:
- xorjoep
- Date:
- Thu Jun 21 11:56:27 2018 +0000
- Revision:
- 3:4098b9d3d571
- Parent:
- 1:24714b45cd1b
headers is a folder not a library
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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xorjoep | 1:24714b45cd1b | 1 | /* ---------------------------------------------------------------------- |
xorjoep | 1:24714b45cd1b | 2 | * Project: CMSIS DSP Library |
xorjoep | 1:24714b45cd1b | 3 | * Title: arm_abs_f32.c |
xorjoep | 1:24714b45cd1b | 4 | * Description: Floating-point vector absolute value |
xorjoep | 1:24714b45cd1b | 5 | * |
xorjoep | 1:24714b45cd1b | 6 | * $Date: 27. January 2017 |
xorjoep | 1:24714b45cd1b | 7 | * $Revision: V.1.5.1 |
xorjoep | 1:24714b45cd1b | 8 | * |
xorjoep | 1:24714b45cd1b | 9 | * Target Processor: Cortex-M cores |
xorjoep | 1:24714b45cd1b | 10 | * -------------------------------------------------------------------- */ |
xorjoep | 1:24714b45cd1b | 11 | /* |
xorjoep | 1:24714b45cd1b | 12 | * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. |
xorjoep | 1:24714b45cd1b | 13 | * |
xorjoep | 1:24714b45cd1b | 14 | * SPDX-License-Identifier: Apache-2.0 |
xorjoep | 1:24714b45cd1b | 15 | * |
xorjoep | 1:24714b45cd1b | 16 | * Licensed under the Apache License, Version 2.0 (the License); you may |
xorjoep | 1:24714b45cd1b | 17 | * not use this file except in compliance with the License. |
xorjoep | 1:24714b45cd1b | 18 | * You may obtain a copy of the License at |
xorjoep | 1:24714b45cd1b | 19 | * |
xorjoep | 1:24714b45cd1b | 20 | * www.apache.org/licenses/LICENSE-2.0 |
xorjoep | 1:24714b45cd1b | 21 | * |
xorjoep | 1:24714b45cd1b | 22 | * Unless required by applicable law or agreed to in writing, software |
xorjoep | 1:24714b45cd1b | 23 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
xorjoep | 1:24714b45cd1b | 24 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
xorjoep | 1:24714b45cd1b | 25 | * See the License for the specific language governing permissions and |
xorjoep | 1:24714b45cd1b | 26 | * limitations under the License. |
xorjoep | 1:24714b45cd1b | 27 | */ |
xorjoep | 1:24714b45cd1b | 28 | |
xorjoep | 1:24714b45cd1b | 29 | #include "arm_math.h" |
xorjoep | 1:24714b45cd1b | 30 | #include <math.h> |
xorjoep | 1:24714b45cd1b | 31 | |
xorjoep | 1:24714b45cd1b | 32 | /** |
xorjoep | 1:24714b45cd1b | 33 | * @ingroup groupMath |
xorjoep | 1:24714b45cd1b | 34 | */ |
xorjoep | 1:24714b45cd1b | 35 | |
xorjoep | 1:24714b45cd1b | 36 | /** |
xorjoep | 1:24714b45cd1b | 37 | * @defgroup BasicAbs Vector Absolute Value |
xorjoep | 1:24714b45cd1b | 38 | * |
xorjoep | 1:24714b45cd1b | 39 | * Computes the absolute value of a vector on an element-by-element basis. |
xorjoep | 1:24714b45cd1b | 40 | * |
xorjoep | 1:24714b45cd1b | 41 | * <pre> |
xorjoep | 1:24714b45cd1b | 42 | * pDst[n] = abs(pSrc[n]), 0 <= n < blockSize. |
xorjoep | 1:24714b45cd1b | 43 | * </pre> |
xorjoep | 1:24714b45cd1b | 44 | * |
xorjoep | 1:24714b45cd1b | 45 | * The functions support in-place computation allowing the source and |
xorjoep | 1:24714b45cd1b | 46 | * destination pointers to reference the same memory buffer. |
xorjoep | 1:24714b45cd1b | 47 | * There are separate functions for floating-point, Q7, Q15, and Q31 data types. |
xorjoep | 1:24714b45cd1b | 48 | */ |
xorjoep | 1:24714b45cd1b | 49 | |
xorjoep | 1:24714b45cd1b | 50 | /** |
xorjoep | 1:24714b45cd1b | 51 | * @addtogroup BasicAbs |
xorjoep | 1:24714b45cd1b | 52 | * @{ |
xorjoep | 1:24714b45cd1b | 53 | */ |
xorjoep | 1:24714b45cd1b | 54 | |
xorjoep | 1:24714b45cd1b | 55 | /** |
xorjoep | 1:24714b45cd1b | 56 | * @brief Floating-point vector absolute value. |
xorjoep | 1:24714b45cd1b | 57 | * @param[in] *pSrc points to the input buffer |
xorjoep | 1:24714b45cd1b | 58 | * @param[out] *pDst points to the output buffer |
xorjoep | 1:24714b45cd1b | 59 | * @param[in] blockSize number of samples in each vector |
xorjoep | 1:24714b45cd1b | 60 | * @return none. |
xorjoep | 1:24714b45cd1b | 61 | */ |
xorjoep | 1:24714b45cd1b | 62 | |
xorjoep | 1:24714b45cd1b | 63 | void arm_abs_f32( |
xorjoep | 1:24714b45cd1b | 64 | float32_t * pSrc, |
xorjoep | 1:24714b45cd1b | 65 | float32_t * pDst, |
xorjoep | 1:24714b45cd1b | 66 | uint32_t blockSize) |
xorjoep | 1:24714b45cd1b | 67 | { |
xorjoep | 1:24714b45cd1b | 68 | uint32_t blkCnt; /* loop counter */ |
xorjoep | 1:24714b45cd1b | 69 | |
xorjoep | 1:24714b45cd1b | 70 | #if defined (ARM_MATH_DSP) |
xorjoep | 1:24714b45cd1b | 71 | |
xorjoep | 1:24714b45cd1b | 72 | /* Run the below code for Cortex-M4 and Cortex-M3 */ |
xorjoep | 1:24714b45cd1b | 73 | float32_t in1, in2, in3, in4; /* temporary variables */ |
xorjoep | 1:24714b45cd1b | 74 | |
xorjoep | 1:24714b45cd1b | 75 | /*loop Unrolling */ |
xorjoep | 1:24714b45cd1b | 76 | blkCnt = blockSize >> 2U; |
xorjoep | 1:24714b45cd1b | 77 | |
xorjoep | 1:24714b45cd1b | 78 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
xorjoep | 1:24714b45cd1b | 79 | ** a second loop below computes the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 80 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 81 | { |
xorjoep | 1:24714b45cd1b | 82 | /* C = |A| */ |
xorjoep | 1:24714b45cd1b | 83 | /* Calculate absolute and then store the results in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 84 | /* read sample from source */ |
xorjoep | 1:24714b45cd1b | 85 | in1 = *pSrc; |
xorjoep | 1:24714b45cd1b | 86 | in2 = *(pSrc + 1); |
xorjoep | 1:24714b45cd1b | 87 | in3 = *(pSrc + 2); |
xorjoep | 1:24714b45cd1b | 88 | |
xorjoep | 1:24714b45cd1b | 89 | /* find absolute value */ |
xorjoep | 1:24714b45cd1b | 90 | in1 = fabsf(in1); |
xorjoep | 1:24714b45cd1b | 91 | |
xorjoep | 1:24714b45cd1b | 92 | /* read sample from source */ |
xorjoep | 1:24714b45cd1b | 93 | in4 = *(pSrc + 3); |
xorjoep | 1:24714b45cd1b | 94 | |
xorjoep | 1:24714b45cd1b | 95 | /* find absolute value */ |
xorjoep | 1:24714b45cd1b | 96 | in2 = fabsf(in2); |
xorjoep | 1:24714b45cd1b | 97 | |
xorjoep | 1:24714b45cd1b | 98 | /* read sample from source */ |
xorjoep | 1:24714b45cd1b | 99 | *pDst = in1; |
xorjoep | 1:24714b45cd1b | 100 | |
xorjoep | 1:24714b45cd1b | 101 | /* find absolute value */ |
xorjoep | 1:24714b45cd1b | 102 | in3 = fabsf(in3); |
xorjoep | 1:24714b45cd1b | 103 | |
xorjoep | 1:24714b45cd1b | 104 | /* find absolute value */ |
xorjoep | 1:24714b45cd1b | 105 | in4 = fabsf(in4); |
xorjoep | 1:24714b45cd1b | 106 | |
xorjoep | 1:24714b45cd1b | 107 | /* store result to destination */ |
xorjoep | 1:24714b45cd1b | 108 | *(pDst + 1) = in2; |
xorjoep | 1:24714b45cd1b | 109 | |
xorjoep | 1:24714b45cd1b | 110 | /* store result to destination */ |
xorjoep | 1:24714b45cd1b | 111 | *(pDst + 2) = in3; |
xorjoep | 1:24714b45cd1b | 112 | |
xorjoep | 1:24714b45cd1b | 113 | /* store result to destination */ |
xorjoep | 1:24714b45cd1b | 114 | *(pDst + 3) = in4; |
xorjoep | 1:24714b45cd1b | 115 | |
xorjoep | 1:24714b45cd1b | 116 | |
xorjoep | 1:24714b45cd1b | 117 | /* Update source pointer to process next sampels */ |
xorjoep | 1:24714b45cd1b | 118 | pSrc += 4U; |
xorjoep | 1:24714b45cd1b | 119 | |
xorjoep | 1:24714b45cd1b | 120 | /* Update destination pointer to process next sampels */ |
xorjoep | 1:24714b45cd1b | 121 | pDst += 4U; |
xorjoep | 1:24714b45cd1b | 122 | |
xorjoep | 1:24714b45cd1b | 123 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 124 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 125 | } |
xorjoep | 1:24714b45cd1b | 126 | |
xorjoep | 1:24714b45cd1b | 127 | /* If the blockSize is not a multiple of 4, compute any remaining output samples here. |
xorjoep | 1:24714b45cd1b | 128 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 129 | blkCnt = blockSize % 0x4U; |
xorjoep | 1:24714b45cd1b | 130 | |
xorjoep | 1:24714b45cd1b | 131 | #else |
xorjoep | 1:24714b45cd1b | 132 | |
xorjoep | 1:24714b45cd1b | 133 | /* Run the below code for Cortex-M0 */ |
xorjoep | 1:24714b45cd1b | 134 | |
xorjoep | 1:24714b45cd1b | 135 | /* Initialize blkCnt with number of samples */ |
xorjoep | 1:24714b45cd1b | 136 | blkCnt = blockSize; |
xorjoep | 1:24714b45cd1b | 137 | |
xorjoep | 1:24714b45cd1b | 138 | #endif /* #if defined (ARM_MATH_DSP) */ |
xorjoep | 1:24714b45cd1b | 139 | |
xorjoep | 1:24714b45cd1b | 140 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 141 | { |
xorjoep | 1:24714b45cd1b | 142 | /* C = |A| */ |
xorjoep | 1:24714b45cd1b | 143 | /* Calculate absolute and then store the results in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 144 | *pDst++ = fabsf(*pSrc++); |
xorjoep | 1:24714b45cd1b | 145 | |
xorjoep | 1:24714b45cd1b | 146 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 147 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 148 | } |
xorjoep | 1:24714b45cd1b | 149 | } |
xorjoep | 1:24714b45cd1b | 150 | |
xorjoep | 1:24714b45cd1b | 151 | /** |
xorjoep | 1:24714b45cd1b | 152 | * @} end of BasicAbs group |
xorjoep | 1:24714b45cd1b | 153 | */ |