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/* ----------------------------------------------------------------------------
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* Copyright (C) 2010-2014 ARM Limited. All rights reserved.
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*
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* $Date: 19. March 2015
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* $Revision: V.1.4.5
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*
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* Project: CMSIS DSP Library
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* Title: arm_correlate_f32.c
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*
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* Description: Correlation of floating-point sequences.
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*
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* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of ARM LIMITED nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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* -------------------------------------------------------------------------- */
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#include "arm_math.h"
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#include "arm_correlate_f32.h"
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/**
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* @ingroup groupFilters
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*/
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/**
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* @defgroup Corr Correlation
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*
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* Correlation is a mathematical operation that is similar to convolution.
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* As with convolution, correlation uses two signals to produce a third signal.
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* The underlying algorithms in correlation and convolution are identical except that one of the inputs is flipped in convolution.
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* Correlation is commonly used to measure the similarity between two signals.
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* It has applications in pattern recognition, cryptanalysis, and searching.
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* The CMSIS library provides correlation functions for Q7, Q15, Q31 and floating-point data types.
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* Fast versions of the Q15 and Q31 functions are also provided.
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*
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* \par Algorithm
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* Let <code>a[n]</code> and <code>b[n]</code> be sequences of length <code>srcALen</code> and <code>srcBLen</code> samples respectively.
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* The convolution of the two signals is denoted by
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* <pre>
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* c[n] = a[n] * b[n]
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* </pre>
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* In correlation, one of the signals is flipped in time
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* <pre>
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* c[n] = a[n] * b[-n]
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* </pre>
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*
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* \par
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* and this is mathematically defined as
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* \image html CorrelateEquation.gif
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* \par
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* The <code>pSrcA</code> points to the first input vector of length <code>srcALen</code> and <code>pSrcB</code> points to the second input vector of length <code>srcBLen</code>.
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* The result <code>c[n]</code> is of length <code>2 * max(srcALen, srcBLen) - 1</code> and is defined over the interval <code>n=0, 1, 2, ..., (2 * max(srcALen, srcBLen) - 2)</code>.
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* The output result is written to <code>pDst</code> and the calling function must allocate <code>2 * max(srcALen, srcBLen) - 1</code> words for the result.
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*
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* <b>Note</b>
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* \par
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* The <code>pDst</code> should be initialized to all zeros before being used.
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*
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* <b>Fixed-Point Behavior</b>
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* \par
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* Correlation requires summing up a large number of intermediate products.
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* As such, the Q7, Q15, and Q31 functions run a risk of overflow and saturation.
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* Refer to the function specific documentation below for further details of the particular algorithm used.
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*
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*
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* <b>Fast Versions</b>
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*
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* \par
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* Fast versions are supported for Q31 and Q15. Cycles for Fast versions are less compared to Q31 and Q15 of correlate and the design requires
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* the input signals should be scaled down to avoid intermediate overflows.
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*
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*
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* <b>Opt Versions</b>
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*
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* \par
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* Opt versions are supported for Q15 and Q7. Design uses internal scratch buffer for getting good optimisation.
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* These versions are optimised in cycles and consumes more memory(Scratch memory) compared to Q15 and Q7 versions of correlate
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*/
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/**
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* @addtogroup Corr
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* @{
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*/
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/**
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* @brief Correlation of floating-point sequences.
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* @param[in] *pSrcA points to the first input sequence.
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* @param[in] srcALen length of the first input sequence.
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* @param[in] *pSrcB points to the second input sequence.
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* @param[in] srcBLen length of the second input sequence.
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* @param[out] *pDst points to the location where the output result is written. Length 2 * max(srcALen, srcBLen) - 1.
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* @return none.
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*/
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void arm_correlate_f32(
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float * pSrcA,
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int srcALen,
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float * pSrcB,
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int srcBLen,
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float * pDst)
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{
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#ifndef ARM_MATH_CM0_FAMILY
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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float *pIn1; /* inputA pointer */
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float *pIn2; /* inputB pointer */
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float *pOut = pDst; /* output pointer */
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float *px; /* Intermediate inputA pointer */
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float *py; /* Intermediate inputB pointer */
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float *pSrc1; /* Intermediate pointers */
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float sum, acc0, acc1, acc2, acc3; /* Accumulators */
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float x0, x1, x2, x3, c0; /* temporary variables for holding input and coefficient values */
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int j, k = 0u, count, blkCnt, outBlockSize, blockSize1, blockSize2, blockSize3; /* loop counters */
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int32_t inc = 1; /* Destination address modifier */
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/* The algorithm implementation is based on the lengths of the inputs. */
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/* srcB is always made to slide across srcA. */
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/* So srcBLen is always considered as shorter or equal to srcALen */
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/* But CORR(x, y) is reverse of CORR(y, x) */
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/* So, when srcBLen > srcALen, output pointer is made to point to the end of the output buffer */
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/* and the destination pointer modifier, inc is set to -1 */
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/* If srcALen > srcBLen, zero pad has to be done to srcB to make the two inputs of same length */
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/* But to improve the performance,
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* we assume zeroes in the output instead of zero padding either of the the inputs*/
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/* If srcALen > srcBLen,
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* (srcALen - srcBLen) zeroes has to included in the starting of the output buffer */
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/* If srcALen < srcBLen,
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* (srcALen - srcBLen) zeroes has to included in the ending of the output buffer */
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if(srcALen >= srcBLen)
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{
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/* Initialization of inputA pointer */
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pIn1 = pSrcA;
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/* Initialization of inputB pointer */
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pIn2 = pSrcB;
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/* Number of output samples is calculated */
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outBlockSize = (2u * srcALen) - 1u;
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/* When srcALen > srcBLen, zero padding has to be done to srcB
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* to make their lengths equal.
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* Instead, (outBlockSize - (srcALen + srcBLen - 1))
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* number of output samples are made zero */
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j = outBlockSize - (srcALen + (srcBLen - 1u));
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/* Updating the pointer position to non zero value */
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pOut += j;
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//while(j > 0u)
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//{
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// /* Zero is stored in the destination buffer */
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// *pOut++ = 0.0f;
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// /* Decrement the loop counter */
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// j--;
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//}
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}
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else
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|
{
|
| elt14lpo |
2:1161fea84522
|
187
|
/* Initialization of inputA pointer */
|
| elt14lpo |
2:1161fea84522
|
188
|
pIn1 = pSrcB;
|
| elt14lpo |
2:1161fea84522
|
189
|
|
| elt14lpo |
2:1161fea84522
|
190
|
/* Initialization of inputB pointer */
|
| elt14lpo |
2:1161fea84522
|
191
|
pIn2 = pSrcA;
|
| elt14lpo |
2:1161fea84522
|
192
|
|
| elt14lpo |
2:1161fea84522
|
193
|
/* srcBLen is always considered as shorter or equal to srcALen */
|
| elt14lpo |
2:1161fea84522
|
194
|
j = srcBLen;
|
| elt14lpo |
2:1161fea84522
|
195
|
srcBLen = srcALen;
|
| elt14lpo |
2:1161fea84522
|
196
|
srcALen = j;
|
| elt14lpo |
2:1161fea84522
|
197
|
|
| elt14lpo |
2:1161fea84522
|
198
|
/* CORR(x, y) = Reverse order(CORR(y, x)) */
|
| elt14lpo |
2:1161fea84522
|
199
|
/* Hence set the destination pointer to point to the last output sample */
|
| elt14lpo |
2:1161fea84522
|
200
|
pOut = pDst + ((srcALen + srcBLen) - 2u);
|
| elt14lpo |
2:1161fea84522
|
201
|
|
| elt14lpo |
2:1161fea84522
|
202
|
/* Destination address modifier is set to -1 */
|
| elt14lpo |
2:1161fea84522
|
203
|
inc = -1;
|
| elt14lpo |
2:1161fea84522
|
204
|
|
| elt14lpo |
2:1161fea84522
|
205
|
}
|
| elt14lpo |
1:d0884279b41d
|
206
|
|
| elt14lpo |
2:1161fea84522
|
207
|
/* The function is internally
|
| elt14lpo |
2:1161fea84522
|
208
|
* divided into three parts according to the number of multiplications that has to be
|
| elt14lpo |
2:1161fea84522
|
209
|
* taken place between inputA samples and inputB samples. In the first part of the
|
| elt14lpo |
2:1161fea84522
|
210
|
* algorithm, the multiplications increase by one for every iteration.
|
| elt14lpo |
2:1161fea84522
|
211
|
* In the second part of the algorithm, srcBLen number of multiplications are done.
|
| elt14lpo |
2:1161fea84522
|
212
|
* In the third part of the algorithm, the multiplications decrease by one
|
| elt14lpo |
2:1161fea84522
|
213
|
* for every iteration.*/
|
| elt14lpo |
2:1161fea84522
|
214
|
/* The algorithm is implemented in three stages.
|
| elt14lpo |
2:1161fea84522
|
215
|
* The loop counters of each stage is initiated here. */
|
| elt14lpo |
2:1161fea84522
|
216
|
blockSize1 = srcBLen - 1u;
|
| elt14lpo |
2:1161fea84522
|
217
|
blockSize2 = srcALen - (srcBLen - 1u);
|
| elt14lpo |
2:1161fea84522
|
218
|
blockSize3 = blockSize1;
|
| elt14lpo |
2:1161fea84522
|
219
|
|
| elt14lpo |
2:1161fea84522
|
220
|
/* --------------------------
|
| elt14lpo |
2:1161fea84522
|
221
|
* Initializations of stage1
|
| elt14lpo |
2:1161fea84522
|
222
|
* -------------------------*/
|
| elt14lpo |
1:d0884279b41d
|
223
|
|
| elt14lpo |
2:1161fea84522
|
224
|
/* sum = x[0] * y[srcBlen - 1]
|
| elt14lpo |
2:1161fea84522
|
225
|
* sum = x[0] * y[srcBlen-2] + x[1] * y[srcBlen - 1]
|
| elt14lpo |
2:1161fea84522
|
226
|
* ....
|
| elt14lpo |
2:1161fea84522
|
227
|
* sum = x[0] * y[0] + x[1] * y[1] +...+ x[srcBLen - 1] * y[srcBLen - 1]
|
| elt14lpo |
2:1161fea84522
|
228
|
*/
|
| elt14lpo |
2:1161fea84522
|
229
|
|
| elt14lpo |
2:1161fea84522
|
230
|
/* In this stage the MAC operations are increased by 1 for every iteration.
|
| elt14lpo |
2:1161fea84522
|
231
|
The count variable holds the number of MAC operations performed */
|
| elt14lpo |
2:1161fea84522
|
232
|
count = 1u;
|
| elt14lpo |
1:d0884279b41d
|
233
|
|
| elt14lpo |
2:1161fea84522
|
234
|
/* Working pointer of inputA */
|
| elt14lpo |
2:1161fea84522
|
235
|
px = pIn1;
|
| elt14lpo |
2:1161fea84522
|
236
|
|
| elt14lpo |
2:1161fea84522
|
237
|
/* Working pointer of inputB */
|
| elt14lpo |
2:1161fea84522
|
238
|
pSrc1 = pIn2 + (srcBLen - 1u);
|
| elt14lpo |
2:1161fea84522
|
239
|
py = pSrc1;
|
| elt14lpo |
2:1161fea84522
|
240
|
|
| elt14lpo |
2:1161fea84522
|
241
|
/* ------------------------
|
| elt14lpo |
2:1161fea84522
|
242
|
* Stage1 process
|
| elt14lpo |
2:1161fea84522
|
243
|
* ----------------------*/
|
| elt14lpo |
1:d0884279b41d
|
244
|
|
| elt14lpo |
2:1161fea84522
|
245
|
/* The first stage starts here */
|
| elt14lpo |
2:1161fea84522
|
246
|
while(blockSize1 > 0u)
|
| elt14lpo |
2:1161fea84522
|
247
|
{
|
| elt14lpo |
2:1161fea84522
|
248
|
/* Accumulator is made zero for every iteration */
|
| elt14lpo |
2:1161fea84522
|
249
|
sum = 0.0f;
|
| elt14lpo |
1:d0884279b41d
|
250
|
|
| elt14lpo |
2:1161fea84522
|
251
|
/* Apply loop unrolling and compute 4 MACs simultaneously. */
|
| elt14lpo |
2:1161fea84522
|
252
|
k = count >> 2u;
|
| elt14lpo |
1:d0884279b41d
|
253
|
|
| elt14lpo |
2:1161fea84522
|
254
|
/* First part of the processing with loop unrolling. Compute 4 MACs at a time.
|
| elt14lpo |
2:1161fea84522
|
255
|
** a second loop below computes MACs for the remaining 1 to 3 samples. */
|
| elt14lpo |
2:1161fea84522
|
256
|
while(k > 0u)
|
| elt14lpo |
2:1161fea84522
|
257
|
{
|
| elt14lpo |
2:1161fea84522
|
258
|
/* x[0] * y[srcBLen - 4] */
|
| elt14lpo |
2:1161fea84522
|
259
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
260
|
/* x[1] * y[srcBLen - 3] */
|
| elt14lpo |
2:1161fea84522
|
261
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
262
|
/* x[2] * y[srcBLen - 2] */
|
| elt14lpo |
2:1161fea84522
|
263
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
264
|
/* x[3] * y[srcBLen - 1] */
|
| elt14lpo |
2:1161fea84522
|
265
|
sum += *px++ * *py++;
|
| elt14lpo |
1:d0884279b41d
|
266
|
|
| elt14lpo |
2:1161fea84522
|
267
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
268
|
k--;
|
| elt14lpo |
2:1161fea84522
|
269
|
}
|
| elt14lpo |
2:1161fea84522
|
270
|
|
| elt14lpo |
2:1161fea84522
|
271
|
/* If the count is not a multiple of 4, compute any remaining MACs here.
|
| elt14lpo |
2:1161fea84522
|
272
|
** No loop unrolling is used. */
|
| elt14lpo |
2:1161fea84522
|
273
|
k = count % 0x4u;
|
| elt14lpo |
1:d0884279b41d
|
274
|
|
| elt14lpo |
2:1161fea84522
|
275
|
while(k > 0u)
|
| elt14lpo |
2:1161fea84522
|
276
|
{
|
| elt14lpo |
2:1161fea84522
|
277
|
/* Perform the multiply-accumulate */
|
| elt14lpo |
2:1161fea84522
|
278
|
/* x[0] * y[srcBLen - 1] */
|
| elt14lpo |
2:1161fea84522
|
279
|
sum += *px++ * *py++;
|
| elt14lpo |
1:d0884279b41d
|
280
|
|
| elt14lpo |
2:1161fea84522
|
281
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
282
|
k--;
|
| elt14lpo |
1:d0884279b41d
|
283
|
}
|
| elt14lpo |
1:d0884279b41d
|
284
|
|
| elt14lpo |
2:1161fea84522
|
285
|
/* Store the result in the accumulator in the destination buffer. */
|
| elt14lpo |
2:1161fea84522
|
286
|
*pOut = sum;
|
| elt14lpo |
2:1161fea84522
|
287
|
/* Destination pointer is updated according to the address modifier, inc */
|
| elt14lpo |
2:1161fea84522
|
288
|
pOut += inc;
|
| elt14lpo |
1:d0884279b41d
|
289
|
|
| elt14lpo |
2:1161fea84522
|
290
|
/* Update the inputA and inputB pointers for next MAC calculation */
|
| elt14lpo |
2:1161fea84522
|
291
|
py = pSrc1 - count;
|
| elt14lpo |
1:d0884279b41d
|
292
|
px = pIn1;
|
| elt14lpo |
1:d0884279b41d
|
293
|
|
| elt14lpo |
2:1161fea84522
|
294
|
/* Increment the MAC count */
|
| elt14lpo |
2:1161fea84522
|
295
|
count++;
|
| elt14lpo |
2:1161fea84522
|
296
|
|
| elt14lpo |
2:1161fea84522
|
297
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
298
|
blockSize1--;
|
| elt14lpo |
2:1161fea84522
|
299
|
}
|
| elt14lpo |
2:1161fea84522
|
300
|
|
| elt14lpo |
2:1161fea84522
|
301
|
/* --------------------------
|
| elt14lpo |
2:1161fea84522
|
302
|
* Initializations of stage2
|
| elt14lpo |
2:1161fea84522
|
303
|
* ------------------------*/
|
| elt14lpo |
1:d0884279b41d
|
304
|
|
| elt14lpo |
2:1161fea84522
|
305
|
/* sum = x[0] * y[0] + x[1] * y[1] +...+ x[srcBLen-1] * y[srcBLen-1]
|
| elt14lpo |
2:1161fea84522
|
306
|
* sum = x[1] * y[0] + x[2] * y[1] +...+ x[srcBLen] * y[srcBLen-1]
|
| elt14lpo |
2:1161fea84522
|
307
|
* ....
|
| elt14lpo |
2:1161fea84522
|
308
|
* sum = x[srcALen-srcBLen-2] * y[0] + x[srcALen-srcBLen-1] * y[1] +...+ x[srcALen-1] * y[srcBLen-1]
|
| elt14lpo |
2:1161fea84522
|
309
|
*/
|
| elt14lpo |
2:1161fea84522
|
310
|
|
| elt14lpo |
2:1161fea84522
|
311
|
/* Working pointer of inputA */
|
| elt14lpo |
2:1161fea84522
|
312
|
px = pIn1;
|
| elt14lpo |
1:d0884279b41d
|
313
|
|
| elt14lpo |
2:1161fea84522
|
314
|
/* Working pointer of inputB */
|
| elt14lpo |
2:1161fea84522
|
315
|
py = pIn2;
|
| elt14lpo |
2:1161fea84522
|
316
|
|
| elt14lpo |
2:1161fea84522
|
317
|
/* count is index by which the pointer pIn1 to be incremented */
|
| elt14lpo |
2:1161fea84522
|
318
|
count = 0u;
|
| elt14lpo |
2:1161fea84522
|
319
|
|
| elt14lpo |
2:1161fea84522
|
320
|
/* -------------------
|
| elt14lpo |
2:1161fea84522
|
321
|
* Stage2 process
|
| elt14lpo |
2:1161fea84522
|
322
|
* ------------------*/
|
| elt14lpo |
1:d0884279b41d
|
323
|
|
| elt14lpo |
2:1161fea84522
|
324
|
/* Stage2 depends on srcBLen as in this stage srcBLen number of MACS are performed.
|
| elt14lpo |
2:1161fea84522
|
325
|
* So, to loop unroll over blockSize2,
|
| elt14lpo |
2:1161fea84522
|
326
|
* srcBLen should be greater than or equal to 4, to loop unroll the srcBLen loop */
|
| elt14lpo |
2:1161fea84522
|
327
|
if(srcBLen >= 4u)
|
| elt14lpo |
2:1161fea84522
|
328
|
{
|
| elt14lpo |
2:1161fea84522
|
329
|
/* Loop unroll over blockSize2, by 4 */
|
| elt14lpo |
2:1161fea84522
|
330
|
blkCnt = blockSize2 >> 2u;
|
| elt14lpo |
2:1161fea84522
|
331
|
|
| elt14lpo |
2:1161fea84522
|
332
|
while(blkCnt > 0u)
|
| elt14lpo |
2:1161fea84522
|
333
|
{
|
| elt14lpo |
2:1161fea84522
|
334
|
/* Set all accumulators to zero */
|
| elt14lpo |
2:1161fea84522
|
335
|
acc0 = 0.0f;
|
| elt14lpo |
2:1161fea84522
|
336
|
acc1 = 0.0f;
|
| elt14lpo |
2:1161fea84522
|
337
|
acc2 = 0.0f;
|
| elt14lpo |
2:1161fea84522
|
338
|
acc3 = 0.0f;
|
| elt14lpo |
2:1161fea84522
|
339
|
|
| elt14lpo |
2:1161fea84522
|
340
|
/* read x[0], x[1], x[2] samples */
|
| elt14lpo |
2:1161fea84522
|
341
|
x0 = *(px++);
|
| elt14lpo |
2:1161fea84522
|
342
|
x1 = *(px++);
|
| elt14lpo |
2:1161fea84522
|
343
|
x2 = *(px++);
|
| elt14lpo |
1:d0884279b41d
|
344
|
|
| elt14lpo |
2:1161fea84522
|
345
|
/* Apply loop unrolling and compute 4 MACs simultaneously. */
|
| elt14lpo |
2:1161fea84522
|
346
|
k = srcBLen >> 2u;
|
| elt14lpo |
2:1161fea84522
|
347
|
|
| elt14lpo |
2:1161fea84522
|
348
|
/* First part of the processing with loop unrolling. Compute 4 MACs at a time.
|
| elt14lpo |
2:1161fea84522
|
349
|
** a second loop below computes MACs for the remaining 1 to 3 samples. */
|
| elt14lpo |
2:1161fea84522
|
350
|
do
|
| elt14lpo |
2:1161fea84522
|
351
|
{
|
| elt14lpo |
2:1161fea84522
|
352
|
/* Read y[0] sample */
|
| elt14lpo |
2:1161fea84522
|
353
|
c0 = *(py++);
|
| elt14lpo |
2:1161fea84522
|
354
|
|
| elt14lpo |
2:1161fea84522
|
355
|
/* Read x[3] sample */
|
| elt14lpo |
2:1161fea84522
|
356
|
x3 = *(px++);
|
| elt14lpo |
2:1161fea84522
|
357
|
|
| elt14lpo |
2:1161fea84522
|
358
|
/* Perform the multiply-accumulate */
|
| elt14lpo |
2:1161fea84522
|
359
|
/* acc0 += x[0] * y[0] */
|
| elt14lpo |
2:1161fea84522
|
360
|
acc0 += x0 * c0;
|
| elt14lpo |
2:1161fea84522
|
361
|
/* acc1 += x[1] * y[0] */
|
| elt14lpo |
2:1161fea84522
|
362
|
acc1 += x1 * c0;
|
| elt14lpo |
2:1161fea84522
|
363
|
/* acc2 += x[2] * y[0] */
|
| elt14lpo |
2:1161fea84522
|
364
|
acc2 += x2 * c0;
|
| elt14lpo |
2:1161fea84522
|
365
|
/* acc3 += x[3] * y[0] */
|
| elt14lpo |
2:1161fea84522
|
366
|
acc3 += x3 * c0;
|
| elt14lpo |
1:d0884279b41d
|
367
|
|
| elt14lpo |
2:1161fea84522
|
368
|
/* Read y[1] sample */
|
| elt14lpo |
2:1161fea84522
|
369
|
c0 = *(py++);
|
| elt14lpo |
2:1161fea84522
|
370
|
|
| elt14lpo |
2:1161fea84522
|
371
|
/* Read x[4] sample */
|
| elt14lpo |
2:1161fea84522
|
372
|
x0 = *(px++);
|
| elt14lpo |
2:1161fea84522
|
373
|
|
| elt14lpo |
2:1161fea84522
|
374
|
/* Perform the multiply-accumulate */
|
| elt14lpo |
2:1161fea84522
|
375
|
/* acc0 += x[1] * y[1] */
|
| elt14lpo |
2:1161fea84522
|
376
|
acc0 += x1 * c0;
|
| elt14lpo |
2:1161fea84522
|
377
|
/* acc1 += x[2] * y[1] */
|
| elt14lpo |
2:1161fea84522
|
378
|
acc1 += x2 * c0;
|
| elt14lpo |
2:1161fea84522
|
379
|
/* acc2 += x[3] * y[1] */
|
| elt14lpo |
2:1161fea84522
|
380
|
acc2 += x3 * c0;
|
| elt14lpo |
2:1161fea84522
|
381
|
/* acc3 += x[4] * y[1] */
|
| elt14lpo |
2:1161fea84522
|
382
|
acc3 += x0 * c0;
|
| elt14lpo |
2:1161fea84522
|
383
|
|
| elt14lpo |
2:1161fea84522
|
384
|
/* Read y[2] sample */
|
| elt14lpo |
2:1161fea84522
|
385
|
c0 = *(py++);
|
| elt14lpo |
1:d0884279b41d
|
386
|
|
| elt14lpo |
2:1161fea84522
|
387
|
/* Read x[5] sample */
|
| elt14lpo |
2:1161fea84522
|
388
|
x1 = *(px++);
|
| elt14lpo |
1:d0884279b41d
|
389
|
|
| elt14lpo |
2:1161fea84522
|
390
|
/* Perform the multiply-accumulates */
|
| elt14lpo |
2:1161fea84522
|
391
|
/* acc0 += x[2] * y[2] */
|
| elt14lpo |
2:1161fea84522
|
392
|
acc0 += x2 * c0;
|
| elt14lpo |
2:1161fea84522
|
393
|
/* acc1 += x[3] * y[2] */
|
| elt14lpo |
2:1161fea84522
|
394
|
acc1 += x3 * c0;
|
| elt14lpo |
2:1161fea84522
|
395
|
/* acc2 += x[4] * y[2] */
|
| elt14lpo |
2:1161fea84522
|
396
|
acc2 += x0 * c0;
|
| elt14lpo |
2:1161fea84522
|
397
|
/* acc3 += x[5] * y[2] */
|
| elt14lpo |
2:1161fea84522
|
398
|
acc3 += x1 * c0;
|
| elt14lpo |
2:1161fea84522
|
399
|
|
| elt14lpo |
2:1161fea84522
|
400
|
/* Read y[3] sample */
|
| elt14lpo |
2:1161fea84522
|
401
|
c0 = *(py++);
|
| elt14lpo |
2:1161fea84522
|
402
|
|
| elt14lpo |
2:1161fea84522
|
403
|
/* Read x[6] sample */
|
| elt14lpo |
2:1161fea84522
|
404
|
x2 = *(px++);
|
| elt14lpo |
1:d0884279b41d
|
405
|
|
| elt14lpo |
2:1161fea84522
|
406
|
/* Perform the multiply-accumulates */
|
| elt14lpo |
2:1161fea84522
|
407
|
/* acc0 += x[3] * y[3] */
|
| elt14lpo |
2:1161fea84522
|
408
|
acc0 += x3 * c0;
|
| elt14lpo |
2:1161fea84522
|
409
|
/* acc1 += x[4] * y[3] */
|
| elt14lpo |
2:1161fea84522
|
410
|
acc1 += x0 * c0;
|
| elt14lpo |
2:1161fea84522
|
411
|
/* acc2 += x[5] * y[3] */
|
| elt14lpo |
2:1161fea84522
|
412
|
acc2 += x1 * c0;
|
| elt14lpo |
2:1161fea84522
|
413
|
/* acc3 += x[6] * y[3] */
|
| elt14lpo |
2:1161fea84522
|
414
|
acc3 += x2 * c0;
|
| elt14lpo |
2:1161fea84522
|
415
|
|
| elt14lpo |
2:1161fea84522
|
416
|
|
| elt14lpo |
2:1161fea84522
|
417
|
} while(--k);
|
| elt14lpo |
2:1161fea84522
|
418
|
|
| elt14lpo |
2:1161fea84522
|
419
|
/* If the srcBLen is not a multiple of 4, compute any remaining MACs here.
|
| elt14lpo |
2:1161fea84522
|
420
|
** No loop unrolling is used. */
|
| elt14lpo |
2:1161fea84522
|
421
|
k = srcBLen % 0x4u;
|
| elt14lpo |
1:d0884279b41d
|
422
|
|
| elt14lpo |
2:1161fea84522
|
423
|
while(k > 0u)
|
| elt14lpo |
2:1161fea84522
|
424
|
{
|
| elt14lpo |
2:1161fea84522
|
425
|
/* Read y[4] sample */
|
| elt14lpo |
2:1161fea84522
|
426
|
c0 = *(py++);
|
| elt14lpo |
2:1161fea84522
|
427
|
|
| elt14lpo |
2:1161fea84522
|
428
|
/* Read x[7] sample */
|
| elt14lpo |
2:1161fea84522
|
429
|
x3 = *(px++);
|
| elt14lpo |
1:d0884279b41d
|
430
|
|
| elt14lpo |
2:1161fea84522
|
431
|
/* Perform the multiply-accumulates */
|
| elt14lpo |
2:1161fea84522
|
432
|
/* acc0 += x[4] * y[4] */
|
| elt14lpo |
2:1161fea84522
|
433
|
acc0 += x0 * c0;
|
| elt14lpo |
2:1161fea84522
|
434
|
/* acc1 += x[5] * y[4] */
|
| elt14lpo |
2:1161fea84522
|
435
|
acc1 += x1 * c0;
|
| elt14lpo |
2:1161fea84522
|
436
|
/* acc2 += x[6] * y[4] */
|
| elt14lpo |
2:1161fea84522
|
437
|
acc2 += x2 * c0;
|
| elt14lpo |
2:1161fea84522
|
438
|
/* acc3 += x[7] * y[4] */
|
| elt14lpo |
2:1161fea84522
|
439
|
acc3 += x3 * c0;
|
| elt14lpo |
1:d0884279b41d
|
440
|
|
| elt14lpo |
2:1161fea84522
|
441
|
/* Reuse the present samples for the next MAC */
|
| elt14lpo |
2:1161fea84522
|
442
|
x0 = x1;
|
| elt14lpo |
2:1161fea84522
|
443
|
x1 = x2;
|
| elt14lpo |
2:1161fea84522
|
444
|
x2 = x3;
|
| elt14lpo |
1:d0884279b41d
|
445
|
|
| elt14lpo |
1:d0884279b41d
|
446
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
447
|
k--;
|
| elt14lpo |
2:1161fea84522
|
448
|
}
|
| elt14lpo |
2:1161fea84522
|
449
|
|
| elt14lpo |
2:1161fea84522
|
450
|
/* Store the result in the accumulator in the destination buffer. */
|
| elt14lpo |
2:1161fea84522
|
451
|
*pOut = acc0;
|
| elt14lpo |
2:1161fea84522
|
452
|
/* Destination pointer is updated according to the address modifier, inc */
|
| elt14lpo |
2:1161fea84522
|
453
|
pOut += inc;
|
| elt14lpo |
2:1161fea84522
|
454
|
|
| elt14lpo |
2:1161fea84522
|
455
|
*pOut = acc1;
|
| elt14lpo |
2:1161fea84522
|
456
|
pOut += inc;
|
| elt14lpo |
2:1161fea84522
|
457
|
|
| elt14lpo |
2:1161fea84522
|
458
|
*pOut = acc2;
|
| elt14lpo |
2:1161fea84522
|
459
|
pOut += inc;
|
| elt14lpo |
2:1161fea84522
|
460
|
|
| elt14lpo |
2:1161fea84522
|
461
|
*pOut = acc3;
|
| elt14lpo |
2:1161fea84522
|
462
|
pOut += inc;
|
| elt14lpo |
2:1161fea84522
|
463
|
|
| elt14lpo |
2:1161fea84522
|
464
|
/* Increment the pointer pIn1 index, count by 4 */
|
| elt14lpo |
2:1161fea84522
|
465
|
count += 4u;
|
| elt14lpo |
2:1161fea84522
|
466
|
|
| elt14lpo |
2:1161fea84522
|
467
|
/* Update the inputA and inputB pointers for next MAC calculation */
|
| elt14lpo |
2:1161fea84522
|
468
|
px = pIn1 + count;
|
| elt14lpo |
2:1161fea84522
|
469
|
py = pIn2;
|
| elt14lpo |
2:1161fea84522
|
470
|
|
| elt14lpo |
2:1161fea84522
|
471
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
472
|
blkCnt--;
|
| elt14lpo |
1:d0884279b41d
|
473
|
}
|
| elt14lpo |
1:d0884279b41d
|
474
|
|
| elt14lpo |
2:1161fea84522
|
475
|
/* If the blockSize2 is not a multiple of 4, compute any remaining output samples here.
|
| elt14lpo |
2:1161fea84522
|
476
|
** No loop unrolling is used. */
|
| elt14lpo |
2:1161fea84522
|
477
|
blkCnt = blockSize2 % 0x4u;
|
| elt14lpo |
2:1161fea84522
|
478
|
|
| elt14lpo |
2:1161fea84522
|
479
|
while(blkCnt > 0u)
|
| elt14lpo |
2:1161fea84522
|
480
|
{
|
| elt14lpo |
2:1161fea84522
|
481
|
/* Accumulator is made zero for every iteration */
|
| elt14lpo |
2:1161fea84522
|
482
|
sum = 0.0f;
|
| elt14lpo |
2:1161fea84522
|
483
|
|
| elt14lpo |
2:1161fea84522
|
484
|
/* Apply loop unrolling and compute 4 MACs simultaneously. */
|
| elt14lpo |
2:1161fea84522
|
485
|
k = srcBLen >> 2u;
|
| elt14lpo |
2:1161fea84522
|
486
|
|
| elt14lpo |
2:1161fea84522
|
487
|
/* First part of the processing with loop unrolling. Compute 4 MACs at a time.
|
| elt14lpo |
2:1161fea84522
|
488
|
** a second loop below computes MACs for the remaining 1 to 3 samples. */
|
| elt14lpo |
2:1161fea84522
|
489
|
while(k > 0u)
|
| elt14lpo |
2:1161fea84522
|
490
|
{
|
| elt14lpo |
2:1161fea84522
|
491
|
/* Perform the multiply-accumulates */
|
| elt14lpo |
2:1161fea84522
|
492
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
493
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
494
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
495
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
496
|
|
| elt14lpo |
2:1161fea84522
|
497
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
498
|
k--;
|
| elt14lpo |
2:1161fea84522
|
499
|
}
|
| elt14lpo |
2:1161fea84522
|
500
|
|
| elt14lpo |
2:1161fea84522
|
501
|
/* If the srcBLen is not a multiple of 4, compute any remaining MACs here.
|
| elt14lpo |
2:1161fea84522
|
502
|
** No loop unrolling is used. */
|
| elt14lpo |
2:1161fea84522
|
503
|
k = srcBLen % 0x4u;
|
| elt14lpo |
2:1161fea84522
|
504
|
|
| elt14lpo |
2:1161fea84522
|
505
|
while(k > 0u)
|
| elt14lpo |
2:1161fea84522
|
506
|
{
|
| elt14lpo |
2:1161fea84522
|
507
|
/* Perform the multiply-accumulate */
|
| elt14lpo |
2:1161fea84522
|
508
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
509
|
|
| elt14lpo |
2:1161fea84522
|
510
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
511
|
k--;
|
| elt14lpo |
2:1161fea84522
|
512
|
}
|
| elt14lpo |
2:1161fea84522
|
513
|
|
| elt14lpo |
2:1161fea84522
|
514
|
/* Store the result in the accumulator in the destination buffer. */
|
| elt14lpo |
2:1161fea84522
|
515
|
*pOut = sum;
|
| elt14lpo |
2:1161fea84522
|
516
|
/* Destination pointer is updated according to the address modifier, inc */
|
| elt14lpo |
2:1161fea84522
|
517
|
pOut += inc;
|
| elt14lpo |
2:1161fea84522
|
518
|
|
| elt14lpo |
2:1161fea84522
|
519
|
/* Increment the pointer pIn1 index, count by 1 */
|
| elt14lpo |
2:1161fea84522
|
520
|
count++;
|
| elt14lpo |
2:1161fea84522
|
521
|
|
| elt14lpo |
2:1161fea84522
|
522
|
/* Update the inputA and inputB pointers for next MAC calculation */
|
| elt14lpo |
2:1161fea84522
|
523
|
px = pIn1 + count;
|
| elt14lpo |
2:1161fea84522
|
524
|
py = pIn2;
|
| elt14lpo |
2:1161fea84522
|
525
|
|
| elt14lpo |
2:1161fea84522
|
526
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
527
|
blkCnt--;
|
| elt14lpo |
2:1161fea84522
|
528
|
}
|
| elt14lpo |
2:1161fea84522
|
529
|
}
|
| elt14lpo |
2:1161fea84522
|
530
|
else
|
| elt14lpo |
2:1161fea84522
|
531
|
{
|
| elt14lpo |
2:1161fea84522
|
532
|
/* If the srcBLen is not a multiple of 4,
|
| elt14lpo |
2:1161fea84522
|
533
|
* the blockSize2 loop cannot be unrolled by 4 */
|
| elt14lpo |
2:1161fea84522
|
534
|
blkCnt = blockSize2;
|
| elt14lpo |
2:1161fea84522
|
535
|
|
| elt14lpo |
2:1161fea84522
|
536
|
while(blkCnt > 0u)
|
| elt14lpo |
2:1161fea84522
|
537
|
{
|
| elt14lpo |
2:1161fea84522
|
538
|
/* Accumulator is made zero for every iteration */
|
| elt14lpo |
2:1161fea84522
|
539
|
sum = 0.0f;
|
| elt14lpo |
2:1161fea84522
|
540
|
|
| elt14lpo |
2:1161fea84522
|
541
|
/* Loop over srcBLen */
|
| elt14lpo |
2:1161fea84522
|
542
|
k = srcBLen;
|
| elt14lpo |
2:1161fea84522
|
543
|
|
| elt14lpo |
2:1161fea84522
|
544
|
while(k > 0u)
|
| elt14lpo |
2:1161fea84522
|
545
|
{
|
| elt14lpo |
2:1161fea84522
|
546
|
/* Perform the multiply-accumulate */
|
| elt14lpo |
2:1161fea84522
|
547
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
548
|
|
| elt14lpo |
2:1161fea84522
|
549
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
550
|
k--;
|
| elt14lpo |
2:1161fea84522
|
551
|
}
|
| elt14lpo |
2:1161fea84522
|
552
|
|
| elt14lpo |
2:1161fea84522
|
553
|
/* Store the result in the accumulator in the destination buffer. */
|
| elt14lpo |
2:1161fea84522
|
554
|
*pOut = sum;
|
| elt14lpo |
2:1161fea84522
|
555
|
/* Destination pointer is updated according to the address modifier, inc */
|
| elt14lpo |
2:1161fea84522
|
556
|
pOut += inc;
|
| elt14lpo |
1:d0884279b41d
|
557
|
|
| elt14lpo |
2:1161fea84522
|
558
|
/* Increment the pointer pIn1 index, count by 1 */
|
| elt14lpo |
2:1161fea84522
|
559
|
count++;
|
| elt14lpo |
2:1161fea84522
|
560
|
|
| elt14lpo |
2:1161fea84522
|
561
|
/* Update the inputA and inputB pointers for next MAC calculation */
|
| elt14lpo |
2:1161fea84522
|
562
|
px = pIn1 + count;
|
| elt14lpo |
2:1161fea84522
|
563
|
py = pIn2;
|
| elt14lpo |
2:1161fea84522
|
564
|
|
| elt14lpo |
2:1161fea84522
|
565
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
566
|
blkCnt--;
|
| elt14lpo |
2:1161fea84522
|
567
|
}
|
| elt14lpo |
2:1161fea84522
|
568
|
}
|
| elt14lpo |
2:1161fea84522
|
569
|
|
| elt14lpo |
2:1161fea84522
|
570
|
/* --------------------------
|
| elt14lpo |
2:1161fea84522
|
571
|
* Initializations of stage3
|
| elt14lpo |
2:1161fea84522
|
572
|
* -------------------------*/
|
| elt14lpo |
2:1161fea84522
|
573
|
|
| elt14lpo |
2:1161fea84522
|
574
|
/* sum += x[srcALen-srcBLen+1] * y[0] + x[srcALen-srcBLen+2] * y[1] +...+ x[srcALen-1] * y[srcBLen-1]
|
| elt14lpo |
2:1161fea84522
|
575
|
* sum += x[srcALen-srcBLen+2] * y[0] + x[srcALen-srcBLen+3] * y[1] +...+ x[srcALen-1] * y[srcBLen-1]
|
| elt14lpo |
2:1161fea84522
|
576
|
* ....
|
| elt14lpo |
2:1161fea84522
|
577
|
* sum += x[srcALen-2] * y[0] + x[srcALen-1] * y[1]
|
| elt14lpo |
2:1161fea84522
|
578
|
* sum += x[srcALen-1] * y[0]
|
| elt14lpo |
2:1161fea84522
|
579
|
*/
|
| elt14lpo |
2:1161fea84522
|
580
|
|
| elt14lpo |
2:1161fea84522
|
581
|
/* In this stage the MAC operations are decreased by 1 for every iteration.
|
| elt14lpo |
2:1161fea84522
|
582
|
The count variable holds the number of MAC operations performed */
|
| elt14lpo |
2:1161fea84522
|
583
|
count = srcBLen - 1u;
|
| elt14lpo |
2:1161fea84522
|
584
|
|
| elt14lpo |
2:1161fea84522
|
585
|
/* Working pointer of inputA */
|
| elt14lpo |
2:1161fea84522
|
586
|
pSrc1 = pIn1 + (srcALen - (srcBLen - 1u));
|
| elt14lpo |
2:1161fea84522
|
587
|
px = pSrc1;
|
| elt14lpo |
2:1161fea84522
|
588
|
|
| elt14lpo |
2:1161fea84522
|
589
|
/* Working pointer of inputB */
|
| elt14lpo |
2:1161fea84522
|
590
|
py = pIn2;
|
| elt14lpo |
2:1161fea84522
|
591
|
|
| elt14lpo |
2:1161fea84522
|
592
|
/* -------------------
|
| elt14lpo |
2:1161fea84522
|
593
|
* Stage3 process
|
| elt14lpo |
2:1161fea84522
|
594
|
* ------------------*/
|
| elt14lpo |
1:d0884279b41d
|
595
|
|
| elt14lpo |
2:1161fea84522
|
596
|
while(blockSize3 > 0u)
|
| elt14lpo |
2:1161fea84522
|
597
|
{
|
| elt14lpo |
2:1161fea84522
|
598
|
/* Accumulator is made zero for every iteration */
|
| elt14lpo |
2:1161fea84522
|
599
|
sum = 0.0f;
|
| elt14lpo |
2:1161fea84522
|
600
|
|
| elt14lpo |
2:1161fea84522
|
601
|
/* Apply loop unrolling and compute 4 MACs simultaneously. */
|
| elt14lpo |
2:1161fea84522
|
602
|
k = count >> 2u;
|
| elt14lpo |
2:1161fea84522
|
603
|
|
| elt14lpo |
2:1161fea84522
|
604
|
/* First part of the processing with loop unrolling. Compute 4 MACs at a time.
|
| elt14lpo |
2:1161fea84522
|
605
|
** a second loop below computes MACs for the remaining 1 to 3 samples. */
|
| elt14lpo |
2:1161fea84522
|
606
|
while(k > 0u)
|
| elt14lpo |
2:1161fea84522
|
607
|
{
|
| elt14lpo |
2:1161fea84522
|
608
|
/* Perform the multiply-accumulates */
|
| elt14lpo |
2:1161fea84522
|
609
|
/* sum += x[srcALen - srcBLen + 4] * y[3] */
|
| elt14lpo |
2:1161fea84522
|
610
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
611
|
/* sum += x[srcALen - srcBLen + 3] * y[2] */
|
| elt14lpo |
2:1161fea84522
|
612
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
613
|
/* sum += x[srcALen - srcBLen + 2] * y[1] */
|
| elt14lpo |
2:1161fea84522
|
614
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
615
|
/* sum += x[srcALen - srcBLen + 1] * y[0] */
|
| elt14lpo |
2:1161fea84522
|
616
|
sum += *px++ * *py++;
|
| elt14lpo |
1:d0884279b41d
|
617
|
|
| elt14lpo |
2:1161fea84522
|
618
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
619
|
k--;
|
| elt14lpo |
2:1161fea84522
|
620
|
}
|
| elt14lpo |
2:1161fea84522
|
621
|
|
| elt14lpo |
2:1161fea84522
|
622
|
/* If the count is not a multiple of 4, compute any remaining MACs here.
|
| elt14lpo |
2:1161fea84522
|
623
|
** No loop unrolling is used. */
|
| elt14lpo |
2:1161fea84522
|
624
|
k = count % 0x4u;
|
| elt14lpo |
2:1161fea84522
|
625
|
|
| elt14lpo |
2:1161fea84522
|
626
|
while(k > 0u)
|
| elt14lpo |
2:1161fea84522
|
627
|
{
|
| elt14lpo |
2:1161fea84522
|
628
|
/* Perform the multiply-accumulates */
|
| elt14lpo |
2:1161fea84522
|
629
|
sum += *px++ * *py++;
|
| elt14lpo |
2:1161fea84522
|
630
|
|
| elt14lpo |
2:1161fea84522
|
631
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
632
|
k--;
|
| elt14lpo |
2:1161fea84522
|
633
|
}
|
| elt14lpo |
2:1161fea84522
|
634
|
|
| elt14lpo |
2:1161fea84522
|
635
|
/* Store the result in the accumulator in the destination buffer. */
|
| elt14lpo |
2:1161fea84522
|
636
|
*pOut = sum;
|
| elt14lpo |
2:1161fea84522
|
637
|
/* Destination pointer is updated according to the address modifier, inc */
|
| elt14lpo |
2:1161fea84522
|
638
|
pOut += inc;
|
| elt14lpo |
2:1161fea84522
|
639
|
|
| elt14lpo |
2:1161fea84522
|
640
|
/* Update the inputA and inputB pointers for next MAC calculation */
|
| elt14lpo |
2:1161fea84522
|
641
|
px = ++pSrc1;
|
| elt14lpo |
1:d0884279b41d
|
642
|
py = pIn2;
|
| elt14lpo |
1:d0884279b41d
|
643
|
|
| elt14lpo |
2:1161fea84522
|
644
|
/* Decrement the MAC count */
|
| elt14lpo |
2:1161fea84522
|
645
|
count--;
|
| elt14lpo |
1:d0884279b41d
|
646
|
|
| elt14lpo |
2:1161fea84522
|
647
|
/* Decrement the loop counter */
|
| elt14lpo |
2:1161fea84522
|
648
|
blockSize3--;
|
| elt14lpo |
2:1161fea84522
|
649
|
}
|
| elt14lpo |
1:d0884279b41d
|
650
|
|
| elt14lpo |
2:1161fea84522
|
651
|
#else
|
| elt14lpo |
1:d0884279b41d
|
652
|
|
| elt14lpo |
2:1161fea84522
|
653
|
/* Run the below code for Cortex-M0 */
|
| elt14lpo |
1:d0884279b41d
|
654
|
|
| elt14lpo |
2:1161fea84522
|
655
|
float *pIn1 = pSrcA; /* inputA pointer */
|
| elt14lpo |
2:1161fea84522
|
656
|
float *pIn2 = pSrcB + (srcBLen - 1u); /* inputB pointer */
|
| elt14lpo |
2:1161fea84522
|
657
|
float sum; /* Accumulator */
|
| elt14lpo |
2:1161fea84522
|
658
|
int i = 0u, j; /* loop counters */
|
| elt14lpo |
2:1161fea84522
|
659
|
int inv = 0u; /* Reverse order flag */
|
| elt14lpo |
2:1161fea84522
|
660
|
int tot = 0u; /* Length */
|
| elt14lpo |
1:d0884279b41d
|
661
|
|
| elt14lpo |
2:1161fea84522
|
662
|
/* The algorithm implementation is based on the lengths of the inputs. */
|
| elt14lpo |
2:1161fea84522
|
663
|
/* srcB is always made to slide across srcA. */
|
| elt14lpo |
2:1161fea84522
|
664
|
/* So srcBLen is always considered as shorter or equal to srcALen */
|
| elt14lpo |
2:1161fea84522
|
665
|
/* But CORR(x, y) is reverse of CORR(y, x) */
|
| elt14lpo |
2:1161fea84522
|
666
|
/* So, when srcBLen > srcALen, output pointer is made to point to the end of the output buffer */
|
| elt14lpo |
2:1161fea84522
|
667
|
/* and a varaible, inv is set to 1 */
|
| elt14lpo |
2:1161fea84522
|
668
|
/* If lengths are not equal then zero pad has to be done to make the two
|
| elt14lpo |
2:1161fea84522
|
669
|
* inputs of same length. But to improve the performance, we assume zeroes
|
| elt14lpo |
2:1161fea84522
|
670
|
* in the output instead of zero padding either of the the inputs*/
|
| elt14lpo |
2:1161fea84522
|
671
|
/* If srcALen > srcBLen, (srcALen - srcBLen) zeroes has to included in the
|
| elt14lpo |
2:1161fea84522
|
672
|
* starting of the output buffer */
|
| elt14lpo |
2:1161fea84522
|
673
|
/* If srcALen < srcBLen, (srcALen - srcBLen) zeroes has to included in the
|
| elt14lpo |
2:1161fea84522
|
674
|
* ending of the output buffer */
|
| elt14lpo |
2:1161fea84522
|
675
|
/* Once the zero padding is done the remaining of the output is calcualted
|
| elt14lpo |
2:1161fea84522
|
676
|
* using convolution but with the shorter signal time shifted. */
|
| elt14lpo |
1:d0884279b41d
|
677
|
|
| elt14lpo |
2:1161fea84522
|
678
|
/* Calculate the length of the remaining sequence */
|
| elt14lpo |
2:1161fea84522
|
679
|
tot = ((srcALen + srcBLen) - 2u);
|
| elt14lpo |
1:d0884279b41d
|
680
|
|
| elt14lpo |
2:1161fea84522
|
681
|
if(srcALen > srcBLen)
|
| elt14lpo |
2:1161fea84522
|
682
|
{
|
| elt14lpo |
2:1161fea84522
|
683
|
/* Calculating the number of zeros to be padded to the output */
|
| elt14lpo |
2:1161fea84522
|
684
|
j = srcALen - srcBLen;
|
| elt14lpo |
1:d0884279b41d
|
685
|
|
| elt14lpo |
2:1161fea84522
|
686
|
/* Initialise the pointer after zero padding */
|
| elt14lpo |
2:1161fea84522
|
687
|
pDst += j;
|
| elt14lpo |
2:1161fea84522
|
688
|
}
|
| elt14lpo |
1:d0884279b41d
|
689
|
|
| elt14lpo |
2:1161fea84522
|
690
|
else if(srcALen < srcBLen)
|
| elt14lpo |
2:1161fea84522
|
691
|
{
|
| elt14lpo |
2:1161fea84522
|
692
|
/* Initialization to inputB pointer */
|
| elt14lpo |
2:1161fea84522
|
693
|
pIn1 = pSrcB;
|
| elt14lpo |
1:d0884279b41d
|
694
|
|
| elt14lpo |
2:1161fea84522
|
695
|
/* Initialization to the end of inputA pointer */
|
| elt14lpo |
2:1161fea84522
|
696
|
pIn2 = pSrcA + (srcALen - 1u);
|
| elt14lpo |
1:d0884279b41d
|
697
|
|
| elt14lpo |
2:1161fea84522
|
698
|
/* Initialisation of the pointer after zero padding */
|
| elt14lpo |
2:1161fea84522
|
699
|
pDst = pDst + tot;
|
| elt14lpo |
1:d0884279b41d
|
700
|
|
| elt14lpo |
2:1161fea84522
|
701
|
/* Swapping the lengths */
|
| elt14lpo |
2:1161fea84522
|
702
|
j = srcALen;
|
| elt14lpo |
2:1161fea84522
|
703
|
srcALen = srcBLen;
|
| elt14lpo |
2:1161fea84522
|
704
|
srcBLen = j;
|
| elt14lpo |
1:d0884279b41d
|
705
|
|
| elt14lpo |
2:1161fea84522
|
706
|
/* Setting the reverse flag */
|
| elt14lpo |
2:1161fea84522
|
707
|
inv = 1;
|
| elt14lpo |
1:d0884279b41d
|
708
|
|
| elt14lpo |
2:1161fea84522
|
709
|
}
|
| elt14lpo |
1:d0884279b41d
|
710
|
|
| elt14lpo |
2:1161fea84522
|
711
|
/* Loop to calculate convolution for output length number of times */
|
| elt14lpo |
2:1161fea84522
|
712
|
for (i = 0u; i <= tot; i++)
|
| elt14lpo |
2:1161fea84522
|
713
|
{
|
| elt14lpo |
2:1161fea84522
|
714
|
/* Initialize sum with zero to carry on MAC operations */
|
| elt14lpo |
2:1161fea84522
|
715
|
sum = 0.0f;
|
| elt14lpo |
1:d0884279b41d
|
716
|
|
| elt14lpo |
2:1161fea84522
|
717
|
/* Loop to perform MAC operations according to convolution equation */
|
| elt14lpo |
2:1161fea84522
|
718
|
for (j = 0u; j <= i; j++)
|
| elt14lpo |
2:1161fea84522
|
719
|
{
|
| elt14lpo |
2:1161fea84522
|
720
|
/* Check the array limitations */
|
| elt14lpo |
2:1161fea84522
|
721
|
if((((i - j) < srcBLen) && (j < srcALen)))
|
| elt14lpo |
2:1161fea84522
|
722
|
{
|
| elt14lpo |
2:1161fea84522
|
723
|
/* z[i] += x[i-j] * y[j] */
|
| elt14lpo |
2:1161fea84522
|
724
|
sum += pIn1[j] * pIn2[-((int32_t) i - j)];
|
| elt14lpo |
2:1161fea84522
|
725
|
}
|
| elt14lpo |
2:1161fea84522
|
726
|
}
|
| elt14lpo |
2:1161fea84522
|
727
|
/* Store the output in the destination buffer */
|
| elt14lpo |
2:1161fea84522
|
728
|
if(inv == 1)
|
| elt14lpo |
2:1161fea84522
|
729
|
*pDst-- = sum;
|
| elt14lpo |
2:1161fea84522
|
730
|
else
|
| elt14lpo |
2:1161fea84522
|
731
|
*pDst++ = sum;
|
| elt14lpo |
2:1161fea84522
|
732
|
}
|
| elt14lpo |
1:d0884279b41d
|
733
|
|
| elt14lpo |
2:1161fea84522
|
734
|
#endif /* #ifndef ARM_MATH_CM0_FAMILY */
|
| elt14lpo |
1:d0884279b41d
|
735
|
|
| elt14lpo |
1:d0884279b41d
|
736
|
}
|
| elt14lpo |
1:d0884279b41d
|
737
|
|
| elt14lpo |
2:1161fea84522
|
738
|
/**
|
| elt14lpo |
2:1161fea84522
|
739
|
* @} end of Corr group
|
| elt14lpo |
2:1161fea84522
|
740
|
*/ |
Elektronikprojekt Grupp 13