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functions/ComplexMathFunctions/arm_cmplx_mag_squared_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?
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xorjoep | 1:24714b45cd1b | 1 | /* ---------------------------------------------------------------------- |
xorjoep | 1:24714b45cd1b | 2 | * Project: CMSIS DSP Library |
xorjoep | 1:24714b45cd1b | 3 | * Title: arm_cmplx_mag_squared_f32.c |
xorjoep | 1:24714b45cd1b | 4 | * Description: Floating-point complex magnitude squared |
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 | |
xorjoep | 1:24714b45cd1b | 31 | /** |
xorjoep | 1:24714b45cd1b | 32 | * @ingroup groupCmplxMath |
xorjoep | 1:24714b45cd1b | 33 | */ |
xorjoep | 1:24714b45cd1b | 34 | |
xorjoep | 1:24714b45cd1b | 35 | /** |
xorjoep | 1:24714b45cd1b | 36 | * @defgroup cmplx_mag_squared Complex Magnitude Squared |
xorjoep | 1:24714b45cd1b | 37 | * |
xorjoep | 1:24714b45cd1b | 38 | * Computes the magnitude squared of the elements of a complex data vector. |
xorjoep | 1:24714b45cd1b | 39 | * |
xorjoep | 1:24714b45cd1b | 40 | * The <code>pSrc</code> points to the source data and |
xorjoep | 1:24714b45cd1b | 41 | * <code>pDst</code> points to the where the result should be written. |
xorjoep | 1:24714b45cd1b | 42 | * <code>numSamples</code> specifies the number of complex samples |
xorjoep | 1:24714b45cd1b | 43 | * in the input array and the data is stored in an interleaved fashion |
xorjoep | 1:24714b45cd1b | 44 | * (real, imag, real, imag, ...). |
xorjoep | 1:24714b45cd1b | 45 | * The input array has a total of <code>2*numSamples</code> values; |
xorjoep | 1:24714b45cd1b | 46 | * the output array has a total of <code>numSamples</code> values. |
xorjoep | 1:24714b45cd1b | 47 | * |
xorjoep | 1:24714b45cd1b | 48 | * The underlying algorithm is used: |
xorjoep | 1:24714b45cd1b | 49 | * |
xorjoep | 1:24714b45cd1b | 50 | * <pre> |
xorjoep | 1:24714b45cd1b | 51 | * for(n=0; n<numSamples; n++) { |
xorjoep | 1:24714b45cd1b | 52 | * pDst[n] = pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2; |
xorjoep | 1:24714b45cd1b | 53 | * } |
xorjoep | 1:24714b45cd1b | 54 | * </pre> |
xorjoep | 1:24714b45cd1b | 55 | * |
xorjoep | 1:24714b45cd1b | 56 | * There are separate functions for floating-point, Q15, and Q31 data types. |
xorjoep | 1:24714b45cd1b | 57 | */ |
xorjoep | 1:24714b45cd1b | 58 | |
xorjoep | 1:24714b45cd1b | 59 | /** |
xorjoep | 1:24714b45cd1b | 60 | * @addtogroup cmplx_mag_squared |
xorjoep | 1:24714b45cd1b | 61 | * @{ |
xorjoep | 1:24714b45cd1b | 62 | */ |
xorjoep | 1:24714b45cd1b | 63 | |
xorjoep | 1:24714b45cd1b | 64 | |
xorjoep | 1:24714b45cd1b | 65 | /** |
xorjoep | 1:24714b45cd1b | 66 | * @brief Floating-point complex magnitude squared |
xorjoep | 1:24714b45cd1b | 67 | * @param[in] *pSrc points to the complex input vector |
xorjoep | 1:24714b45cd1b | 68 | * @param[out] *pDst points to the real output vector |
xorjoep | 1:24714b45cd1b | 69 | * @param[in] numSamples number of complex samples in the input vector |
xorjoep | 1:24714b45cd1b | 70 | * @return none. |
xorjoep | 1:24714b45cd1b | 71 | */ |
xorjoep | 1:24714b45cd1b | 72 | |
xorjoep | 1:24714b45cd1b | 73 | void arm_cmplx_mag_squared_f32( |
xorjoep | 1:24714b45cd1b | 74 | float32_t * pSrc, |
xorjoep | 1:24714b45cd1b | 75 | float32_t * pDst, |
xorjoep | 1:24714b45cd1b | 76 | uint32_t numSamples) |
xorjoep | 1:24714b45cd1b | 77 | { |
xorjoep | 1:24714b45cd1b | 78 | float32_t real, imag; /* Temporary variables to store real and imaginary values */ |
xorjoep | 1:24714b45cd1b | 79 | uint32_t blkCnt; /* loop counter */ |
xorjoep | 1:24714b45cd1b | 80 | |
xorjoep | 1:24714b45cd1b | 81 | #if defined (ARM_MATH_DSP) |
xorjoep | 1:24714b45cd1b | 82 | float32_t real1, real2, real3, real4; /* Temporary variables to hold real values */ |
xorjoep | 1:24714b45cd1b | 83 | float32_t imag1, imag2, imag3, imag4; /* Temporary variables to hold imaginary values */ |
xorjoep | 1:24714b45cd1b | 84 | float32_t mul1, mul2, mul3, mul4; /* Temporary variables */ |
xorjoep | 1:24714b45cd1b | 85 | float32_t mul5, mul6, mul7, mul8; /* Temporary variables */ |
xorjoep | 1:24714b45cd1b | 86 | float32_t out1, out2, out3, out4; /* Temporary variables to hold output values */ |
xorjoep | 1:24714b45cd1b | 87 | |
xorjoep | 1:24714b45cd1b | 88 | /*loop Unrolling */ |
xorjoep | 1:24714b45cd1b | 89 | blkCnt = numSamples >> 2U; |
xorjoep | 1:24714b45cd1b | 90 | |
xorjoep | 1:24714b45cd1b | 91 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
xorjoep | 1:24714b45cd1b | 92 | ** a second loop below computes the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 93 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 94 | { |
xorjoep | 1:24714b45cd1b | 95 | /* C[0] = (A[0] * A[0] + A[1] * A[1]) */ |
xorjoep | 1:24714b45cd1b | 96 | /* read real input sample from source buffer */ |
xorjoep | 1:24714b45cd1b | 97 | real1 = pSrc[0]; |
xorjoep | 1:24714b45cd1b | 98 | /* read imaginary input sample from source buffer */ |
xorjoep | 1:24714b45cd1b | 99 | imag1 = pSrc[1]; |
xorjoep | 1:24714b45cd1b | 100 | |
xorjoep | 1:24714b45cd1b | 101 | /* calculate power of real value */ |
xorjoep | 1:24714b45cd1b | 102 | mul1 = real1 * real1; |
xorjoep | 1:24714b45cd1b | 103 | |
xorjoep | 1:24714b45cd1b | 104 | /* read real input sample from source buffer */ |
xorjoep | 1:24714b45cd1b | 105 | real2 = pSrc[2]; |
xorjoep | 1:24714b45cd1b | 106 | |
xorjoep | 1:24714b45cd1b | 107 | /* calculate power of imaginary value */ |
xorjoep | 1:24714b45cd1b | 108 | mul2 = imag1 * imag1; |
xorjoep | 1:24714b45cd1b | 109 | |
xorjoep | 1:24714b45cd1b | 110 | /* read imaginary input sample from source buffer */ |
xorjoep | 1:24714b45cd1b | 111 | imag2 = pSrc[3]; |
xorjoep | 1:24714b45cd1b | 112 | |
xorjoep | 1:24714b45cd1b | 113 | /* calculate power of real value */ |
xorjoep | 1:24714b45cd1b | 114 | mul3 = real2 * real2; |
xorjoep | 1:24714b45cd1b | 115 | |
xorjoep | 1:24714b45cd1b | 116 | /* read real input sample from source buffer */ |
xorjoep | 1:24714b45cd1b | 117 | real3 = pSrc[4]; |
xorjoep | 1:24714b45cd1b | 118 | |
xorjoep | 1:24714b45cd1b | 119 | /* calculate power of imaginary value */ |
xorjoep | 1:24714b45cd1b | 120 | mul4 = imag2 * imag2; |
xorjoep | 1:24714b45cd1b | 121 | |
xorjoep | 1:24714b45cd1b | 122 | /* read imaginary input sample from source buffer */ |
xorjoep | 1:24714b45cd1b | 123 | imag3 = pSrc[5]; |
xorjoep | 1:24714b45cd1b | 124 | |
xorjoep | 1:24714b45cd1b | 125 | /* calculate power of real value */ |
xorjoep | 1:24714b45cd1b | 126 | mul5 = real3 * real3; |
xorjoep | 1:24714b45cd1b | 127 | /* calculate power of imaginary value */ |
xorjoep | 1:24714b45cd1b | 128 | mul6 = imag3 * imag3; |
xorjoep | 1:24714b45cd1b | 129 | |
xorjoep | 1:24714b45cd1b | 130 | /* read real input sample from source buffer */ |
xorjoep | 1:24714b45cd1b | 131 | real4 = pSrc[6]; |
xorjoep | 1:24714b45cd1b | 132 | |
xorjoep | 1:24714b45cd1b | 133 | /* accumulate real and imaginary powers */ |
xorjoep | 1:24714b45cd1b | 134 | out1 = mul1 + mul2; |
xorjoep | 1:24714b45cd1b | 135 | |
xorjoep | 1:24714b45cd1b | 136 | /* read imaginary input sample from source buffer */ |
xorjoep | 1:24714b45cd1b | 137 | imag4 = pSrc[7]; |
xorjoep | 1:24714b45cd1b | 138 | |
xorjoep | 1:24714b45cd1b | 139 | /* accumulate real and imaginary powers */ |
xorjoep | 1:24714b45cd1b | 140 | out2 = mul3 + mul4; |
xorjoep | 1:24714b45cd1b | 141 | |
xorjoep | 1:24714b45cd1b | 142 | /* calculate power of real value */ |
xorjoep | 1:24714b45cd1b | 143 | mul7 = real4 * real4; |
xorjoep | 1:24714b45cd1b | 144 | /* calculate power of imaginary value */ |
xorjoep | 1:24714b45cd1b | 145 | mul8 = imag4 * imag4; |
xorjoep | 1:24714b45cd1b | 146 | |
xorjoep | 1:24714b45cd1b | 147 | /* store output to destination */ |
xorjoep | 1:24714b45cd1b | 148 | pDst[0] = out1; |
xorjoep | 1:24714b45cd1b | 149 | |
xorjoep | 1:24714b45cd1b | 150 | /* accumulate real and imaginary powers */ |
xorjoep | 1:24714b45cd1b | 151 | out3 = mul5 + mul6; |
xorjoep | 1:24714b45cd1b | 152 | |
xorjoep | 1:24714b45cd1b | 153 | /* store output to destination */ |
xorjoep | 1:24714b45cd1b | 154 | pDst[1] = out2; |
xorjoep | 1:24714b45cd1b | 155 | |
xorjoep | 1:24714b45cd1b | 156 | /* accumulate real and imaginary powers */ |
xorjoep | 1:24714b45cd1b | 157 | out4 = mul7 + mul8; |
xorjoep | 1:24714b45cd1b | 158 | |
xorjoep | 1:24714b45cd1b | 159 | /* store output to destination */ |
xorjoep | 1:24714b45cd1b | 160 | pDst[2] = out3; |
xorjoep | 1:24714b45cd1b | 161 | |
xorjoep | 1:24714b45cd1b | 162 | /* increment destination pointer by 8 to process next samples */ |
xorjoep | 1:24714b45cd1b | 163 | pSrc += 8U; |
xorjoep | 1:24714b45cd1b | 164 | |
xorjoep | 1:24714b45cd1b | 165 | /* store output to destination */ |
xorjoep | 1:24714b45cd1b | 166 | pDst[3] = out4; |
xorjoep | 1:24714b45cd1b | 167 | |
xorjoep | 1:24714b45cd1b | 168 | /* increment destination pointer by 4 to process next samples */ |
xorjoep | 1:24714b45cd1b | 169 | pDst += 4U; |
xorjoep | 1:24714b45cd1b | 170 | |
xorjoep | 1:24714b45cd1b | 171 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 172 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 173 | } |
xorjoep | 1:24714b45cd1b | 174 | |
xorjoep | 1:24714b45cd1b | 175 | /* If the numSamples is not a multiple of 4, compute any remaining output samples here. |
xorjoep | 1:24714b45cd1b | 176 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 177 | blkCnt = numSamples % 0x4U; |
xorjoep | 1:24714b45cd1b | 178 | |
xorjoep | 1:24714b45cd1b | 179 | #else |
xorjoep | 1:24714b45cd1b | 180 | |
xorjoep | 1:24714b45cd1b | 181 | /* Run the below code for Cortex-M0 */ |
xorjoep | 1:24714b45cd1b | 182 | |
xorjoep | 1:24714b45cd1b | 183 | blkCnt = numSamples; |
xorjoep | 1:24714b45cd1b | 184 | |
xorjoep | 1:24714b45cd1b | 185 | #endif /* #if defined (ARM_MATH_DSP) */ |
xorjoep | 1:24714b45cd1b | 186 | |
xorjoep | 1:24714b45cd1b | 187 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 188 | { |
xorjoep | 1:24714b45cd1b | 189 | /* C[0] = (A[0] * A[0] + A[1] * A[1]) */ |
xorjoep | 1:24714b45cd1b | 190 | real = *pSrc++; |
xorjoep | 1:24714b45cd1b | 191 | imag = *pSrc++; |
xorjoep | 1:24714b45cd1b | 192 | |
xorjoep | 1:24714b45cd1b | 193 | /* out = (real * real) + (imag * imag) */ |
xorjoep | 1:24714b45cd1b | 194 | /* store the result in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 195 | *pDst++ = (real * real) + (imag * imag); |
xorjoep | 1:24714b45cd1b | 196 | |
xorjoep | 1:24714b45cd1b | 197 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 198 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 199 | } |
xorjoep | 1:24714b45cd1b | 200 | } |
xorjoep | 1:24714b45cd1b | 201 | |
xorjoep | 1:24714b45cd1b | 202 | /** |
xorjoep | 1:24714b45cd1b | 203 | * @} end of cmplx_mag_squared group |
xorjoep | 1:24714b45cd1b | 204 | */ |