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| 2 | mjames | 1 | /* ---------------------------------------------------------------------- |
| 2 | * Project: CMSIS DSP Library |
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| 3 | * Title: arm_cmplx_mult_real_f32.c |
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| 4 | * Description: Floating-point complex by real multiplication |
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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 groupCmplxMath |
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| 33 | */ |
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| 34 | |||
| 35 | /** |
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| 36 | * @defgroup CmplxByRealMult Complex-by-Real Multiplication |
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| 37 | * |
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| 38 | * Multiplies a complex vector by a real vector and generates a complex result. |
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| 39 | * The data in the complex arrays is stored in an interleaved fashion |
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| 40 | * (real, imag, real, imag, ...). |
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| 41 | * The parameter <code>numSamples</code> represents the number of complex |
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| 42 | * samples processed. The complex arrays have a total of <code>2*numSamples</code> |
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| 43 | * real values while the real array has a total of <code>numSamples</code> |
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| 44 | * real values. |
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| 45 | * |
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| 46 | * The underlying algorithm is used: |
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| 47 | * |
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| 48 | * <pre> |
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| 49 | * for(n=0; n<numSamples; n++) { |
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| 50 | * pCmplxDst[(2*n)+0] = pSrcCmplx[(2*n)+0] * pSrcReal[n]; |
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| 51 | * pCmplxDst[(2*n)+1] = pSrcCmplx[(2*n)+1] * pSrcReal[n]; |
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| 52 | * } |
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| 53 | * </pre> |
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| 54 | * |
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| 55 | * There are separate functions for floating-point, Q15, and Q31 data types. |
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| 56 | */ |
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| 57 | |||
| 58 | /** |
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| 59 | * @addtogroup CmplxByRealMult |
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| 60 | * @{ |
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| 61 | */ |
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| 62 | |||
| 63 | |||
| 64 | /** |
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| 65 | * @brief Floating-point complex-by-real multiplication |
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| 66 | * @param[in] *pSrcCmplx points to the complex input vector |
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| 67 | * @param[in] *pSrcReal points to the real input vector |
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| 68 | * @param[out] *pCmplxDst points to the complex output vector |
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| 69 | * @param[in] numSamples number of samples in each vector |
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| 70 | * @return none. |
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| 71 | */ |
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| 72 | |||
| 73 | void arm_cmplx_mult_real_f32( |
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| 74 | float32_t * pSrcCmplx, |
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| 75 | float32_t * pSrcReal, |
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| 76 | float32_t * pCmplxDst, |
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| 77 | uint32_t numSamples) |
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| 78 | { |
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| 79 | float32_t in; /* Temporary variable to store input value */ |
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| 80 | uint32_t blkCnt; /* loop counters */ |
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| 81 | |||
| 82 | #if defined (ARM_MATH_DSP) |
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| 83 | |||
| 84 | /* Run the below code for Cortex-M4 and Cortex-M3 */ |
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| 85 | float32_t inA1, inA2, inA3, inA4; /* Temporary variables to hold input data */ |
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| 86 | float32_t inA5, inA6, inA7, inA8; /* Temporary variables to hold input data */ |
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| 87 | float32_t inB1, inB2, inB3, inB4; /* Temporary variables to hold input data */ |
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| 88 | float32_t out1, out2, out3, out4; /* Temporary variables to hold output data */ |
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| 89 | float32_t out5, out6, out7, out8; /* Temporary variables to hold output data */ |
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| 90 | |||
| 91 | /* loop Unrolling */ |
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| 92 | blkCnt = numSamples >> 2U; |
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| 93 | |||
| 94 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
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| 95 | ** a second loop below computes the remaining 1 to 3 samples. */ |
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| 96 | while (blkCnt > 0U) |
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| 97 | { |
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| 98 | /* C[2 * i] = A[2 * i] * B[i]. */ |
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| 99 | /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ |
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| 100 | /* read input from complex input buffer */ |
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| 101 | inA1 = pSrcCmplx[0]; |
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| 102 | inA2 = pSrcCmplx[1]; |
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| 103 | /* read input from real input buffer */ |
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| 104 | inB1 = pSrcReal[0]; |
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| 105 | |||
| 106 | /* read input from complex input buffer */ |
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| 107 | inA3 = pSrcCmplx[2]; |
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| 108 | |||
| 109 | /* multiply complex buffer real input with real buffer input */ |
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| 110 | out1 = inA1 * inB1; |
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| 111 | |||
| 112 | /* read input from complex input buffer */ |
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| 113 | inA4 = pSrcCmplx[3]; |
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| 114 | |||
| 115 | /* multiply complex buffer imaginary input with real buffer input */ |
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| 116 | out2 = inA2 * inB1; |
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| 117 | |||
| 118 | /* read input from real input buffer */ |
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| 119 | inB2 = pSrcReal[1]; |
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| 120 | /* read input from complex input buffer */ |
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| 121 | inA5 = pSrcCmplx[4]; |
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| 122 | |||
| 123 | /* multiply complex buffer real input with real buffer input */ |
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| 124 | out3 = inA3 * inB2; |
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| 125 | |||
| 126 | /* read input from complex input buffer */ |
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| 127 | inA6 = pSrcCmplx[5]; |
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| 128 | /* read input from real input buffer */ |
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| 129 | inB3 = pSrcReal[2]; |
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| 130 | |||
| 131 | /* multiply complex buffer imaginary input with real buffer input */ |
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| 132 | out4 = inA4 * inB2; |
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| 133 | |||
| 134 | /* read input from complex input buffer */ |
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| 135 | inA7 = pSrcCmplx[6]; |
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| 136 | |||
| 137 | /* multiply complex buffer real input with real buffer input */ |
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| 138 | out5 = inA5 * inB3; |
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| 139 | |||
| 140 | /* read input from complex input buffer */ |
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| 141 | inA8 = pSrcCmplx[7]; |
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| 142 | |||
| 143 | /* multiply complex buffer imaginary input with real buffer input */ |
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| 144 | out6 = inA6 * inB3; |
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| 145 | |||
| 146 | /* read input from real input buffer */ |
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| 147 | inB4 = pSrcReal[3]; |
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| 148 | |||
| 149 | /* store result to destination bufer */ |
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| 150 | pCmplxDst[0] = out1; |
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| 151 | |||
| 152 | /* multiply complex buffer real input with real buffer input */ |
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| 153 | out7 = inA7 * inB4; |
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| 154 | |||
| 155 | /* store result to destination bufer */ |
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| 156 | pCmplxDst[1] = out2; |
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| 157 | |||
| 158 | /* multiply complex buffer imaginary input with real buffer input */ |
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| 159 | out8 = inA8 * inB4; |
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| 160 | |||
| 161 | /* store result to destination bufer */ |
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| 162 | pCmplxDst[2] = out3; |
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| 163 | pCmplxDst[3] = out4; |
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| 164 | pCmplxDst[4] = out5; |
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| 165 | |||
| 166 | /* incremnet complex input buffer by 8 to process next samples */ |
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| 167 | pSrcCmplx += 8U; |
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| 168 | |||
| 169 | /* store result to destination bufer */ |
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| 170 | pCmplxDst[5] = out6; |
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| 171 | |||
| 172 | /* increment real input buffer by 4 to process next samples */ |
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| 173 | pSrcReal += 4U; |
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| 174 | |||
| 175 | /* store result to destination bufer */ |
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| 176 | pCmplxDst[6] = out7; |
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| 177 | pCmplxDst[7] = out8; |
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| 178 | |||
| 179 | /* increment destination buffer by 8 to process next sampels */ |
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| 180 | pCmplxDst += 8U; |
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| 181 | |||
| 182 | /* Decrement the numSamples loop counter */ |
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| 183 | blkCnt--; |
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| 184 | } |
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| 185 | |||
| 186 | /* If the numSamples is not a multiple of 4, compute any remaining output samples here. |
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| 187 | ** No loop unrolling is used. */ |
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| 188 | blkCnt = numSamples % 0x4U; |
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| 189 | |||
| 190 | #else |
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| 191 | |||
| 192 | /* Run the below code for Cortex-M0 */ |
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| 193 | blkCnt = numSamples; |
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| 194 | |||
| 195 | #endif /* #if defined (ARM_MATH_DSP) */ |
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| 196 | |||
| 197 | while (blkCnt > 0U) |
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| 198 | { |
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| 199 | /* C[2 * i] = A[2 * i] * B[i]. */ |
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| 200 | /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ |
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| 201 | in = *pSrcReal++; |
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| 202 | /* store the result in the destination buffer. */ |
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| 203 | *pCmplxDst++ = (*pSrcCmplx++) * (in); |
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| 204 | *pCmplxDst++ = (*pSrcCmplx++) * (in); |
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| 205 | |||
| 206 | /* Decrement the numSamples loop counter */ |
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| 207 | blkCnt--; |
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| 208 | } |
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| 209 | } |
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| 210 | |||
| 211 | /** |
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| 212 | * @} end of CmplxByRealMult group |
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| 213 | */ |