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functions/ComplexMathFunctions/arm_cmplx_mult_real_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_mult_real_f32.c |
xorjoep | 1:24714b45cd1b | 4 | * Description: Floating-point complex by real multiplication |
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 CmplxByRealMult Complex-by-Real Multiplication |
xorjoep | 1:24714b45cd1b | 37 | * |
xorjoep | 1:24714b45cd1b | 38 | * Multiplies a complex vector by a real vector and generates a complex result. |
xorjoep | 1:24714b45cd1b | 39 | * The data in the complex arrays is stored in an interleaved fashion |
xorjoep | 1:24714b45cd1b | 40 | * (real, imag, real, imag, ...). |
xorjoep | 1:24714b45cd1b | 41 | * The parameter <code>numSamples</code> represents the number of complex |
xorjoep | 1:24714b45cd1b | 42 | * samples processed. The complex arrays have a total of <code>2*numSamples</code> |
xorjoep | 1:24714b45cd1b | 43 | * real values while the real array has a total of <code>numSamples</code> |
xorjoep | 1:24714b45cd1b | 44 | * real values. |
xorjoep | 1:24714b45cd1b | 45 | * |
xorjoep | 1:24714b45cd1b | 46 | * The underlying algorithm is used: |
xorjoep | 1:24714b45cd1b | 47 | * |
xorjoep | 1:24714b45cd1b | 48 | * <pre> |
xorjoep | 1:24714b45cd1b | 49 | * for(n=0; n<numSamples; n++) { |
xorjoep | 1:24714b45cd1b | 50 | * pCmplxDst[(2*n)+0] = pSrcCmplx[(2*n)+0] * pSrcReal[n]; |
xorjoep | 1:24714b45cd1b | 51 | * pCmplxDst[(2*n)+1] = pSrcCmplx[(2*n)+1] * pSrcReal[n]; |
xorjoep | 1:24714b45cd1b | 52 | * } |
xorjoep | 1:24714b45cd1b | 53 | * </pre> |
xorjoep | 1:24714b45cd1b | 54 | * |
xorjoep | 1:24714b45cd1b | 55 | * There are separate functions for floating-point, Q15, and Q31 data types. |
xorjoep | 1:24714b45cd1b | 56 | */ |
xorjoep | 1:24714b45cd1b | 57 | |
xorjoep | 1:24714b45cd1b | 58 | /** |
xorjoep | 1:24714b45cd1b | 59 | * @addtogroup CmplxByRealMult |
xorjoep | 1:24714b45cd1b | 60 | * @{ |
xorjoep | 1:24714b45cd1b | 61 | */ |
xorjoep | 1:24714b45cd1b | 62 | |
xorjoep | 1:24714b45cd1b | 63 | |
xorjoep | 1:24714b45cd1b | 64 | /** |
xorjoep | 1:24714b45cd1b | 65 | * @brief Floating-point complex-by-real multiplication |
xorjoep | 1:24714b45cd1b | 66 | * @param[in] *pSrcCmplx points to the complex input vector |
xorjoep | 1:24714b45cd1b | 67 | * @param[in] *pSrcReal points to the real input vector |
xorjoep | 1:24714b45cd1b | 68 | * @param[out] *pCmplxDst points to the complex output vector |
xorjoep | 1:24714b45cd1b | 69 | * @param[in] numSamples number of samples in each vector |
xorjoep | 1:24714b45cd1b | 70 | * @return none. |
xorjoep | 1:24714b45cd1b | 71 | */ |
xorjoep | 1:24714b45cd1b | 72 | |
xorjoep | 1:24714b45cd1b | 73 | void arm_cmplx_mult_real_f32( |
xorjoep | 1:24714b45cd1b | 74 | float32_t * pSrcCmplx, |
xorjoep | 1:24714b45cd1b | 75 | float32_t * pSrcReal, |
xorjoep | 1:24714b45cd1b | 76 | float32_t * pCmplxDst, |
xorjoep | 1:24714b45cd1b | 77 | uint32_t numSamples) |
xorjoep | 1:24714b45cd1b | 78 | { |
xorjoep | 1:24714b45cd1b | 79 | float32_t in; /* Temporary variable to store input value */ |
xorjoep | 1:24714b45cd1b | 80 | uint32_t blkCnt; /* loop counters */ |
xorjoep | 1:24714b45cd1b | 81 | |
xorjoep | 1:24714b45cd1b | 82 | #if defined (ARM_MATH_DSP) |
xorjoep | 1:24714b45cd1b | 83 | |
xorjoep | 1:24714b45cd1b | 84 | /* Run the below code for Cortex-M4 and Cortex-M3 */ |
xorjoep | 1:24714b45cd1b | 85 | float32_t inA1, inA2, inA3, inA4; /* Temporary variables to hold input data */ |
xorjoep | 1:24714b45cd1b | 86 | float32_t inA5, inA6, inA7, inA8; /* Temporary variables to hold input data */ |
xorjoep | 1:24714b45cd1b | 87 | float32_t inB1, inB2, inB3, inB4; /* Temporary variables to hold input data */ |
xorjoep | 1:24714b45cd1b | 88 | float32_t out1, out2, out3, out4; /* Temporary variables to hold output data */ |
xorjoep | 1:24714b45cd1b | 89 | float32_t out5, out6, out7, out8; /* Temporary variables to hold output data */ |
xorjoep | 1:24714b45cd1b | 90 | |
xorjoep | 1:24714b45cd1b | 91 | /* loop Unrolling */ |
xorjoep | 1:24714b45cd1b | 92 | blkCnt = numSamples >> 2U; |
xorjoep | 1:24714b45cd1b | 93 | |
xorjoep | 1:24714b45cd1b | 94 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
xorjoep | 1:24714b45cd1b | 95 | ** a second loop below computes the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 96 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 97 | { |
xorjoep | 1:24714b45cd1b | 98 | /* C[2 * i] = A[2 * i] * B[i]. */ |
xorjoep | 1:24714b45cd1b | 99 | /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ |
xorjoep | 1:24714b45cd1b | 100 | /* read input from complex input buffer */ |
xorjoep | 1:24714b45cd1b | 101 | inA1 = pSrcCmplx[0]; |
xorjoep | 1:24714b45cd1b | 102 | inA2 = pSrcCmplx[1]; |
xorjoep | 1:24714b45cd1b | 103 | /* read input from real input buffer */ |
xorjoep | 1:24714b45cd1b | 104 | inB1 = pSrcReal[0]; |
xorjoep | 1:24714b45cd1b | 105 | |
xorjoep | 1:24714b45cd1b | 106 | /* read input from complex input buffer */ |
xorjoep | 1:24714b45cd1b | 107 | inA3 = pSrcCmplx[2]; |
xorjoep | 1:24714b45cd1b | 108 | |
xorjoep | 1:24714b45cd1b | 109 | /* multiply complex buffer real input with real buffer input */ |
xorjoep | 1:24714b45cd1b | 110 | out1 = inA1 * inB1; |
xorjoep | 1:24714b45cd1b | 111 | |
xorjoep | 1:24714b45cd1b | 112 | /* read input from complex input buffer */ |
xorjoep | 1:24714b45cd1b | 113 | inA4 = pSrcCmplx[3]; |
xorjoep | 1:24714b45cd1b | 114 | |
xorjoep | 1:24714b45cd1b | 115 | /* multiply complex buffer imaginary input with real buffer input */ |
xorjoep | 1:24714b45cd1b | 116 | out2 = inA2 * inB1; |
xorjoep | 1:24714b45cd1b | 117 | |
xorjoep | 1:24714b45cd1b | 118 | /* read input from real input buffer */ |
xorjoep | 1:24714b45cd1b | 119 | inB2 = pSrcReal[1]; |
xorjoep | 1:24714b45cd1b | 120 | /* read input from complex input buffer */ |
xorjoep | 1:24714b45cd1b | 121 | inA5 = pSrcCmplx[4]; |
xorjoep | 1:24714b45cd1b | 122 | |
xorjoep | 1:24714b45cd1b | 123 | /* multiply complex buffer real input with real buffer input */ |
xorjoep | 1:24714b45cd1b | 124 | out3 = inA3 * inB2; |
xorjoep | 1:24714b45cd1b | 125 | |
xorjoep | 1:24714b45cd1b | 126 | /* read input from complex input buffer */ |
xorjoep | 1:24714b45cd1b | 127 | inA6 = pSrcCmplx[5]; |
xorjoep | 1:24714b45cd1b | 128 | /* read input from real input buffer */ |
xorjoep | 1:24714b45cd1b | 129 | inB3 = pSrcReal[2]; |
xorjoep | 1:24714b45cd1b | 130 | |
xorjoep | 1:24714b45cd1b | 131 | /* multiply complex buffer imaginary input with real buffer input */ |
xorjoep | 1:24714b45cd1b | 132 | out4 = inA4 * inB2; |
xorjoep | 1:24714b45cd1b | 133 | |
xorjoep | 1:24714b45cd1b | 134 | /* read input from complex input buffer */ |
xorjoep | 1:24714b45cd1b | 135 | inA7 = pSrcCmplx[6]; |
xorjoep | 1:24714b45cd1b | 136 | |
xorjoep | 1:24714b45cd1b | 137 | /* multiply complex buffer real input with real buffer input */ |
xorjoep | 1:24714b45cd1b | 138 | out5 = inA5 * inB3; |
xorjoep | 1:24714b45cd1b | 139 | |
xorjoep | 1:24714b45cd1b | 140 | /* read input from complex input buffer */ |
xorjoep | 1:24714b45cd1b | 141 | inA8 = pSrcCmplx[7]; |
xorjoep | 1:24714b45cd1b | 142 | |
xorjoep | 1:24714b45cd1b | 143 | /* multiply complex buffer imaginary input with real buffer input */ |
xorjoep | 1:24714b45cd1b | 144 | out6 = inA6 * inB3; |
xorjoep | 1:24714b45cd1b | 145 | |
xorjoep | 1:24714b45cd1b | 146 | /* read input from real input buffer */ |
xorjoep | 1:24714b45cd1b | 147 | inB4 = pSrcReal[3]; |
xorjoep | 1:24714b45cd1b | 148 | |
xorjoep | 1:24714b45cd1b | 149 | /* store result to destination bufer */ |
xorjoep | 1:24714b45cd1b | 150 | pCmplxDst[0] = out1; |
xorjoep | 1:24714b45cd1b | 151 | |
xorjoep | 1:24714b45cd1b | 152 | /* multiply complex buffer real input with real buffer input */ |
xorjoep | 1:24714b45cd1b | 153 | out7 = inA7 * inB4; |
xorjoep | 1:24714b45cd1b | 154 | |
xorjoep | 1:24714b45cd1b | 155 | /* store result to destination bufer */ |
xorjoep | 1:24714b45cd1b | 156 | pCmplxDst[1] = out2; |
xorjoep | 1:24714b45cd1b | 157 | |
xorjoep | 1:24714b45cd1b | 158 | /* multiply complex buffer imaginary input with real buffer input */ |
xorjoep | 1:24714b45cd1b | 159 | out8 = inA8 * inB4; |
xorjoep | 1:24714b45cd1b | 160 | |
xorjoep | 1:24714b45cd1b | 161 | /* store result to destination bufer */ |
xorjoep | 1:24714b45cd1b | 162 | pCmplxDst[2] = out3; |
xorjoep | 1:24714b45cd1b | 163 | pCmplxDst[3] = out4; |
xorjoep | 1:24714b45cd1b | 164 | pCmplxDst[4] = out5; |
xorjoep | 1:24714b45cd1b | 165 | |
xorjoep | 1:24714b45cd1b | 166 | /* incremnet complex input buffer by 8 to process next samples */ |
xorjoep | 1:24714b45cd1b | 167 | pSrcCmplx += 8U; |
xorjoep | 1:24714b45cd1b | 168 | |
xorjoep | 1:24714b45cd1b | 169 | /* store result to destination bufer */ |
xorjoep | 1:24714b45cd1b | 170 | pCmplxDst[5] = out6; |
xorjoep | 1:24714b45cd1b | 171 | |
xorjoep | 1:24714b45cd1b | 172 | /* increment real input buffer by 4 to process next samples */ |
xorjoep | 1:24714b45cd1b | 173 | pSrcReal += 4U; |
xorjoep | 1:24714b45cd1b | 174 | |
xorjoep | 1:24714b45cd1b | 175 | /* store result to destination bufer */ |
xorjoep | 1:24714b45cd1b | 176 | pCmplxDst[6] = out7; |
xorjoep | 1:24714b45cd1b | 177 | pCmplxDst[7] = out8; |
xorjoep | 1:24714b45cd1b | 178 | |
xorjoep | 1:24714b45cd1b | 179 | /* increment destination buffer by 8 to process next sampels */ |
xorjoep | 1:24714b45cd1b | 180 | pCmplxDst += 8U; |
xorjoep | 1:24714b45cd1b | 181 | |
xorjoep | 1:24714b45cd1b | 182 | /* Decrement the numSamples loop counter */ |
xorjoep | 1:24714b45cd1b | 183 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 184 | } |
xorjoep | 1:24714b45cd1b | 185 | |
xorjoep | 1:24714b45cd1b | 186 | /* If the numSamples is not a multiple of 4, compute any remaining output samples here. |
xorjoep | 1:24714b45cd1b | 187 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 188 | blkCnt = numSamples % 0x4U; |
xorjoep | 1:24714b45cd1b | 189 | |
xorjoep | 1:24714b45cd1b | 190 | #else |
xorjoep | 1:24714b45cd1b | 191 | |
xorjoep | 1:24714b45cd1b | 192 | /* Run the below code for Cortex-M0 */ |
xorjoep | 1:24714b45cd1b | 193 | blkCnt = numSamples; |
xorjoep | 1:24714b45cd1b | 194 | |
xorjoep | 1:24714b45cd1b | 195 | #endif /* #if defined (ARM_MATH_DSP) */ |
xorjoep | 1:24714b45cd1b | 196 | |
xorjoep | 1:24714b45cd1b | 197 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 198 | { |
xorjoep | 1:24714b45cd1b | 199 | /* C[2 * i] = A[2 * i] * B[i]. */ |
xorjoep | 1:24714b45cd1b | 200 | /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ |
xorjoep | 1:24714b45cd1b | 201 | in = *pSrcReal++; |
xorjoep | 1:24714b45cd1b | 202 | /* store the result in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 203 | *pCmplxDst++ = (*pSrcCmplx++) * (in); |
xorjoep | 1:24714b45cd1b | 204 | *pCmplxDst++ = (*pSrcCmplx++) * (in); |
xorjoep | 1:24714b45cd1b | 205 | |
xorjoep | 1:24714b45cd1b | 206 | /* Decrement the numSamples loop counter */ |
xorjoep | 1:24714b45cd1b | 207 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 208 | } |
xorjoep | 1:24714b45cd1b | 209 | } |
xorjoep | 1:24714b45cd1b | 210 | |
xorjoep | 1:24714b45cd1b | 211 | /** |
xorjoep | 1:24714b45cd1b | 212 | * @} end of CmplxByRealMult group |
xorjoep | 1:24714b45cd1b | 213 | */ |