mbed-os 6.10 versione
cmsis_dsp/ComplexMathFunctions/arm_cmplx_dot_prod_f32.c@3:7a284390b0ce, 2013-11-08 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Nov 08 13:45:10 2013 +0000
- Revision:
- 3:7a284390b0ce
- Parent:
- 2:da51fb522205
Synchronized with git revision e69956aba2f68a2a26ac26b051f8d349deaa1ce8
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
emilmont | 1:fdd22bb7aa52 | 1 | /* ---------------------------------------------------------------------- |
mbed_official | 3:7a284390b0ce | 2 | * Copyright (C) 2010-2013 ARM Limited. All rights reserved. |
emilmont | 1:fdd22bb7aa52 | 3 | * |
mbed_official | 3:7a284390b0ce | 4 | * $Date: 17. January 2013 |
mbed_official | 3:7a284390b0ce | 5 | * $Revision: V1.4.1 |
emilmont | 1:fdd22bb7aa52 | 6 | * |
emilmont | 2:da51fb522205 | 7 | * Project: CMSIS DSP Library |
emilmont | 2:da51fb522205 | 8 | * Title: arm_cmplx_dot_prod_f32.c |
emilmont | 1:fdd22bb7aa52 | 9 | * |
emilmont | 2:da51fb522205 | 10 | * Description: Floating-point complex dot product |
emilmont | 1:fdd22bb7aa52 | 11 | * |
emilmont | 1:fdd22bb7aa52 | 12 | * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
emilmont | 1:fdd22bb7aa52 | 13 | * |
mbed_official | 3:7a284390b0ce | 14 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 3:7a284390b0ce | 15 | * modification, are permitted provided that the following conditions |
mbed_official | 3:7a284390b0ce | 16 | * are met: |
mbed_official | 3:7a284390b0ce | 17 | * - Redistributions of source code must retain the above copyright |
mbed_official | 3:7a284390b0ce | 18 | * notice, this list of conditions and the following disclaimer. |
mbed_official | 3:7a284390b0ce | 19 | * - Redistributions in binary form must reproduce the above copyright |
mbed_official | 3:7a284390b0ce | 20 | * notice, this list of conditions and the following disclaimer in |
mbed_official | 3:7a284390b0ce | 21 | * the documentation and/or other materials provided with the |
mbed_official | 3:7a284390b0ce | 22 | * distribution. |
mbed_official | 3:7a284390b0ce | 23 | * - Neither the name of ARM LIMITED nor the names of its contributors |
mbed_official | 3:7a284390b0ce | 24 | * may be used to endorse or promote products derived from this |
mbed_official | 3:7a284390b0ce | 25 | * software without specific prior written permission. |
mbed_official | 3:7a284390b0ce | 26 | * |
mbed_official | 3:7a284390b0ce | 27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
mbed_official | 3:7a284390b0ce | 28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
mbed_official | 3:7a284390b0ce | 29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
mbed_official | 3:7a284390b0ce | 30 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
mbed_official | 3:7a284390b0ce | 31 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
mbed_official | 3:7a284390b0ce | 32 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
mbed_official | 3:7a284390b0ce | 33 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
mbed_official | 3:7a284390b0ce | 34 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 3:7a284390b0ce | 35 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
mbed_official | 3:7a284390b0ce | 36 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
mbed_official | 3:7a284390b0ce | 37 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
mbed_official | 3:7a284390b0ce | 38 | * POSSIBILITY OF SUCH DAMAGE. |
emilmont | 1:fdd22bb7aa52 | 39 | * ---------------------------------------------------------------------------- */ |
emilmont | 1:fdd22bb7aa52 | 40 | |
emilmont | 1:fdd22bb7aa52 | 41 | #include "arm_math.h" |
emilmont | 1:fdd22bb7aa52 | 42 | |
emilmont | 1:fdd22bb7aa52 | 43 | /** |
emilmont | 1:fdd22bb7aa52 | 44 | * @ingroup groupCmplxMath |
emilmont | 1:fdd22bb7aa52 | 45 | */ |
emilmont | 1:fdd22bb7aa52 | 46 | |
emilmont | 1:fdd22bb7aa52 | 47 | /** |
emilmont | 1:fdd22bb7aa52 | 48 | * @defgroup cmplx_dot_prod Complex Dot Product |
emilmont | 1:fdd22bb7aa52 | 49 | * |
emilmont | 1:fdd22bb7aa52 | 50 | * Computes the dot product of two complex vectors. |
emilmont | 1:fdd22bb7aa52 | 51 | * The vectors are multiplied element-by-element and then summed. |
emilmont | 1:fdd22bb7aa52 | 52 | * |
emilmont | 1:fdd22bb7aa52 | 53 | * The <code>pSrcA</code> points to the first complex input vector and |
emilmont | 1:fdd22bb7aa52 | 54 | * <code>pSrcB</code> points to the second complex input vector. |
emilmont | 1:fdd22bb7aa52 | 55 | * <code>numSamples</code> specifies the number of complex samples |
emilmont | 1:fdd22bb7aa52 | 56 | * and the data in each array is stored in an interleaved fashion |
emilmont | 1:fdd22bb7aa52 | 57 | * (real, imag, real, imag, ...). |
emilmont | 1:fdd22bb7aa52 | 58 | * Each array has a total of <code>2*numSamples</code> values. |
emilmont | 1:fdd22bb7aa52 | 59 | * |
emilmont | 1:fdd22bb7aa52 | 60 | * The underlying algorithm is used: |
emilmont | 1:fdd22bb7aa52 | 61 | * <pre> |
emilmont | 1:fdd22bb7aa52 | 62 | * realResult=0; |
emilmont | 1:fdd22bb7aa52 | 63 | * imagResult=0; |
emilmont | 1:fdd22bb7aa52 | 64 | * for(n=0; n<numSamples; n++) { |
emilmont | 1:fdd22bb7aa52 | 65 | * realResult += pSrcA[(2*n)+0]*pSrcB[(2*n)+0] - pSrcA[(2*n)+1]*pSrcB[(2*n)+1]; |
emilmont | 1:fdd22bb7aa52 | 66 | * imagResult += pSrcA[(2*n)+0]*pSrcB[(2*n)+1] + pSrcA[(2*n)+1]*pSrcB[(2*n)+0]; |
emilmont | 1:fdd22bb7aa52 | 67 | * } |
emilmont | 1:fdd22bb7aa52 | 68 | * </pre> |
emilmont | 1:fdd22bb7aa52 | 69 | * |
emilmont | 1:fdd22bb7aa52 | 70 | * There are separate functions for floating-point, Q15, and Q31 data types. |
emilmont | 1:fdd22bb7aa52 | 71 | */ |
emilmont | 1:fdd22bb7aa52 | 72 | |
emilmont | 1:fdd22bb7aa52 | 73 | /** |
emilmont | 1:fdd22bb7aa52 | 74 | * @addtogroup cmplx_dot_prod |
emilmont | 1:fdd22bb7aa52 | 75 | * @{ |
emilmont | 1:fdd22bb7aa52 | 76 | */ |
emilmont | 1:fdd22bb7aa52 | 77 | |
emilmont | 1:fdd22bb7aa52 | 78 | /** |
emilmont | 1:fdd22bb7aa52 | 79 | * @brief Floating-point complex dot product |
emilmont | 1:fdd22bb7aa52 | 80 | * @param *pSrcA points to the first input vector |
emilmont | 1:fdd22bb7aa52 | 81 | * @param *pSrcB points to the second input vector |
emilmont | 1:fdd22bb7aa52 | 82 | * @param numSamples number of complex samples in each vector |
emilmont | 1:fdd22bb7aa52 | 83 | * @param *realResult real part of the result returned here |
emilmont | 1:fdd22bb7aa52 | 84 | * @param *imagResult imaginary part of the result returned here |
emilmont | 1:fdd22bb7aa52 | 85 | * @return none. |
emilmont | 1:fdd22bb7aa52 | 86 | */ |
emilmont | 1:fdd22bb7aa52 | 87 | |
emilmont | 1:fdd22bb7aa52 | 88 | void arm_cmplx_dot_prod_f32( |
emilmont | 1:fdd22bb7aa52 | 89 | float32_t * pSrcA, |
emilmont | 1:fdd22bb7aa52 | 90 | float32_t * pSrcB, |
emilmont | 1:fdd22bb7aa52 | 91 | uint32_t numSamples, |
emilmont | 1:fdd22bb7aa52 | 92 | float32_t * realResult, |
emilmont | 1:fdd22bb7aa52 | 93 | float32_t * imagResult) |
emilmont | 1:fdd22bb7aa52 | 94 | { |
emilmont | 1:fdd22bb7aa52 | 95 | float32_t real_sum = 0.0f, imag_sum = 0.0f; /* Temporary result storage */ |
emilmont | 1:fdd22bb7aa52 | 96 | |
mbed_official | 3:7a284390b0ce | 97 | #ifndef ARM_MATH_CM0_FAMILY |
emilmont | 1:fdd22bb7aa52 | 98 | |
emilmont | 1:fdd22bb7aa52 | 99 | /* Run the below code for Cortex-M4 and Cortex-M3 */ |
emilmont | 1:fdd22bb7aa52 | 100 | uint32_t blkCnt; /* loop counter */ |
emilmont | 1:fdd22bb7aa52 | 101 | |
emilmont | 1:fdd22bb7aa52 | 102 | /*loop Unrolling */ |
emilmont | 1:fdd22bb7aa52 | 103 | blkCnt = numSamples >> 2u; |
emilmont | 1:fdd22bb7aa52 | 104 | |
emilmont | 1:fdd22bb7aa52 | 105 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
emilmont | 1:fdd22bb7aa52 | 106 | ** a second loop below computes the remaining 1 to 3 samples. */ |
emilmont | 1:fdd22bb7aa52 | 107 | while(blkCnt > 0u) |
emilmont | 1:fdd22bb7aa52 | 108 | { |
emilmont | 1:fdd22bb7aa52 | 109 | /* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */ |
emilmont | 1:fdd22bb7aa52 | 110 | real_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 111 | /* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */ |
emilmont | 1:fdd22bb7aa52 | 112 | imag_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 113 | |
emilmont | 1:fdd22bb7aa52 | 114 | real_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 115 | imag_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 116 | |
emilmont | 1:fdd22bb7aa52 | 117 | real_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 118 | imag_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 119 | |
emilmont | 1:fdd22bb7aa52 | 120 | real_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 121 | imag_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 122 | |
emilmont | 1:fdd22bb7aa52 | 123 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 124 | blkCnt--; |
emilmont | 1:fdd22bb7aa52 | 125 | } |
emilmont | 1:fdd22bb7aa52 | 126 | |
emilmont | 1:fdd22bb7aa52 | 127 | /* If the numSamples is not a multiple of 4, compute any remaining output samples here. |
emilmont | 1:fdd22bb7aa52 | 128 | ** No loop unrolling is used. */ |
emilmont | 1:fdd22bb7aa52 | 129 | blkCnt = numSamples % 0x4u; |
emilmont | 1:fdd22bb7aa52 | 130 | |
emilmont | 1:fdd22bb7aa52 | 131 | while(blkCnt > 0u) |
emilmont | 1:fdd22bb7aa52 | 132 | { |
emilmont | 1:fdd22bb7aa52 | 133 | /* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */ |
emilmont | 1:fdd22bb7aa52 | 134 | real_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 135 | /* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */ |
emilmont | 1:fdd22bb7aa52 | 136 | imag_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 137 | |
emilmont | 1:fdd22bb7aa52 | 138 | |
emilmont | 1:fdd22bb7aa52 | 139 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 140 | blkCnt--; |
emilmont | 1:fdd22bb7aa52 | 141 | } |
emilmont | 1:fdd22bb7aa52 | 142 | |
emilmont | 1:fdd22bb7aa52 | 143 | #else |
emilmont | 1:fdd22bb7aa52 | 144 | |
emilmont | 1:fdd22bb7aa52 | 145 | /* Run the below code for Cortex-M0 */ |
emilmont | 1:fdd22bb7aa52 | 146 | |
emilmont | 1:fdd22bb7aa52 | 147 | while(numSamples > 0u) |
emilmont | 1:fdd22bb7aa52 | 148 | { |
emilmont | 1:fdd22bb7aa52 | 149 | /* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */ |
emilmont | 1:fdd22bb7aa52 | 150 | real_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 151 | /* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */ |
emilmont | 1:fdd22bb7aa52 | 152 | imag_sum += (*pSrcA++) * (*pSrcB++); |
emilmont | 1:fdd22bb7aa52 | 153 | |
emilmont | 1:fdd22bb7aa52 | 154 | |
emilmont | 1:fdd22bb7aa52 | 155 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 156 | numSamples--; |
emilmont | 1:fdd22bb7aa52 | 157 | } |
emilmont | 1:fdd22bb7aa52 | 158 | |
mbed_official | 3:7a284390b0ce | 159 | #endif /* #ifndef ARM_MATH_CM0_FAMILY */ |
emilmont | 1:fdd22bb7aa52 | 160 | |
emilmont | 1:fdd22bb7aa52 | 161 | /* Store the real and imaginary results in the destination buffers */ |
emilmont | 1:fdd22bb7aa52 | 162 | *realResult = real_sum; |
emilmont | 1:fdd22bb7aa52 | 163 | *imagResult = imag_sum; |
emilmont | 1:fdd22bb7aa52 | 164 | } |
emilmont | 1:fdd22bb7aa52 | 165 | |
emilmont | 1:fdd22bb7aa52 | 166 | /** |
emilmont | 1:fdd22bb7aa52 | 167 | * @} end of cmplx_dot_prod group |
emilmont | 1:fdd22bb7aa52 | 168 | */ |