CMSIS DSP library
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cmsis_dsp/FilteringFunctions/arm_correlate_opt_q15.c@5:3762170b6d4d, 2015-11-20 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Nov 20 08:45:18 2015 +0000
- Revision:
- 5:3762170b6d4d
- Parent:
- 3:7a284390b0ce
Synchronized with git revision 2eb940b9a73af188d3004a2575fdfbb05febe62b
Full URL: https://github.com/mbedmicro/mbed/commit/2eb940b9a73af188d3004a2575fdfbb05febe62b/
Added option to build rpc library. closes #1426
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
emilmont | 1:fdd22bb7aa52 | 1 | /* ---------------------------------------------------------------------- |
mbed_official | 5:3762170b6d4d | 2 | * Copyright (C) 2010-2014 ARM Limited. All rights reserved. |
emilmont | 1:fdd22bb7aa52 | 3 | * |
mbed_official | 5:3762170b6d4d | 4 | * $Date: 19. March 2015 |
mbed_official | 5:3762170b6d4d | 5 | * $Revision: V.1.4.5 |
emilmont | 1:fdd22bb7aa52 | 6 | * |
emilmont | 2:da51fb522205 | 7 | * Project: CMSIS DSP Library |
emilmont | 2:da51fb522205 | 8 | * Title: arm_correlate_opt_q15.c |
emilmont | 1:fdd22bb7aa52 | 9 | * |
emilmont | 2:da51fb522205 | 10 | * Description: Correlation of Q15 sequences. |
emilmont | 1:fdd22bb7aa52 | 11 | * |
emilmont | 1:fdd22bb7aa52 | 12 | * Target Processor: Cortex-M4/Cortex-M3 |
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 groupFilters |
emilmont | 1:fdd22bb7aa52 | 45 | */ |
emilmont | 1:fdd22bb7aa52 | 46 | |
emilmont | 1:fdd22bb7aa52 | 47 | /** |
emilmont | 1:fdd22bb7aa52 | 48 | * @addtogroup Corr |
emilmont | 1:fdd22bb7aa52 | 49 | * @{ |
emilmont | 1:fdd22bb7aa52 | 50 | */ |
emilmont | 1:fdd22bb7aa52 | 51 | |
emilmont | 1:fdd22bb7aa52 | 52 | /** |
emilmont | 1:fdd22bb7aa52 | 53 | * @brief Correlation of Q15 sequences. |
emilmont | 1:fdd22bb7aa52 | 54 | * @param[in] *pSrcA points to the first input sequence. |
emilmont | 1:fdd22bb7aa52 | 55 | * @param[in] srcALen length of the first input sequence. |
emilmont | 1:fdd22bb7aa52 | 56 | * @param[in] *pSrcB points to the second input sequence. |
emilmont | 1:fdd22bb7aa52 | 57 | * @param[in] srcBLen length of the second input sequence. |
emilmont | 1:fdd22bb7aa52 | 58 | * @param[out] *pDst points to the location where the output result is written. Length 2 * max(srcALen, srcBLen) - 1. |
emilmont | 1:fdd22bb7aa52 | 59 | * @param[in] *pScratch points to scratch buffer of size max(srcALen, srcBLen) + 2*min(srcALen, srcBLen) - 2. |
emilmont | 1:fdd22bb7aa52 | 60 | * @return none. |
emilmont | 1:fdd22bb7aa52 | 61 | * |
emilmont | 1:fdd22bb7aa52 | 62 | * \par Restrictions |
emilmont | 1:fdd22bb7aa52 | 63 | * If the silicon does not support unaligned memory access enable the macro UNALIGNED_SUPPORT_DISABLE |
emilmont | 2:da51fb522205 | 64 | * In this case input, output, scratch buffers should be aligned by 32-bit |
emilmont | 1:fdd22bb7aa52 | 65 | * |
emilmont | 1:fdd22bb7aa52 | 66 | * @details |
emilmont | 1:fdd22bb7aa52 | 67 | * <b>Scaling and Overflow Behavior:</b> |
emilmont | 1:fdd22bb7aa52 | 68 | * |
emilmont | 1:fdd22bb7aa52 | 69 | * \par |
emilmont | 1:fdd22bb7aa52 | 70 | * The function is implemented using a 64-bit internal accumulator. |
emilmont | 1:fdd22bb7aa52 | 71 | * Both inputs are in 1.15 format and multiplications yield a 2.30 result. |
emilmont | 1:fdd22bb7aa52 | 72 | * The 2.30 intermediate results are accumulated in a 64-bit accumulator in 34.30 format. |
emilmont | 1:fdd22bb7aa52 | 73 | * This approach provides 33 guard bits and there is no risk of overflow. |
emilmont | 1:fdd22bb7aa52 | 74 | * The 34.30 result is then truncated to 34.15 format by discarding the low 15 bits and then saturated to 1.15 format. |
emilmont | 1:fdd22bb7aa52 | 75 | * |
emilmont | 1:fdd22bb7aa52 | 76 | * \par |
emilmont | 1:fdd22bb7aa52 | 77 | * Refer to <code>arm_correlate_fast_q15()</code> for a faster but less precise version of this function for Cortex-M3 and Cortex-M4. |
emilmont | 1:fdd22bb7aa52 | 78 | * |
emilmont | 1:fdd22bb7aa52 | 79 | * |
emilmont | 1:fdd22bb7aa52 | 80 | */ |
emilmont | 1:fdd22bb7aa52 | 81 | |
emilmont | 1:fdd22bb7aa52 | 82 | |
emilmont | 1:fdd22bb7aa52 | 83 | void arm_correlate_opt_q15( |
emilmont | 1:fdd22bb7aa52 | 84 | q15_t * pSrcA, |
emilmont | 1:fdd22bb7aa52 | 85 | uint32_t srcALen, |
emilmont | 1:fdd22bb7aa52 | 86 | q15_t * pSrcB, |
emilmont | 1:fdd22bb7aa52 | 87 | uint32_t srcBLen, |
emilmont | 1:fdd22bb7aa52 | 88 | q15_t * pDst, |
emilmont | 1:fdd22bb7aa52 | 89 | q15_t * pScratch) |
emilmont | 1:fdd22bb7aa52 | 90 | { |
emilmont | 1:fdd22bb7aa52 | 91 | q15_t *pIn1; /* inputA pointer */ |
emilmont | 1:fdd22bb7aa52 | 92 | q15_t *pIn2; /* inputB pointer */ |
emilmont | 1:fdd22bb7aa52 | 93 | q63_t acc0, acc1, acc2, acc3; /* Accumulators */ |
emilmont | 1:fdd22bb7aa52 | 94 | q15_t *py; /* Intermediate inputB pointer */ |
emilmont | 1:fdd22bb7aa52 | 95 | q31_t x1, x2, x3; /* temporary variables for holding input1 and input2 values */ |
emilmont | 1:fdd22bb7aa52 | 96 | uint32_t j, blkCnt, outBlockSize; /* loop counter */ |
emilmont | 1:fdd22bb7aa52 | 97 | int32_t inc = 1; /* output pointer increment */ |
emilmont | 1:fdd22bb7aa52 | 98 | uint32_t tapCnt; |
emilmont | 1:fdd22bb7aa52 | 99 | q31_t y1, y2; |
emilmont | 1:fdd22bb7aa52 | 100 | q15_t *pScr; /* Intermediate pointers */ |
emilmont | 1:fdd22bb7aa52 | 101 | q15_t *pOut = pDst; /* output pointer */ |
emilmont | 1:fdd22bb7aa52 | 102 | #ifdef UNALIGNED_SUPPORT_DISABLE |
emilmont | 1:fdd22bb7aa52 | 103 | |
emilmont | 1:fdd22bb7aa52 | 104 | q15_t a, b; |
emilmont | 1:fdd22bb7aa52 | 105 | |
emilmont | 2:da51fb522205 | 106 | #endif /* #ifndef UNALIGNED_SUPPORT_DISABLE */ |
emilmont | 1:fdd22bb7aa52 | 107 | |
emilmont | 1:fdd22bb7aa52 | 108 | /* The algorithm implementation is based on the lengths of the inputs. */ |
emilmont | 1:fdd22bb7aa52 | 109 | /* srcB is always made to slide across srcA. */ |
emilmont | 1:fdd22bb7aa52 | 110 | /* So srcBLen is always considered as shorter or equal to srcALen */ |
emilmont | 1:fdd22bb7aa52 | 111 | /* But CORR(x, y) is reverse of CORR(y, x) */ |
emilmont | 1:fdd22bb7aa52 | 112 | /* So, when srcBLen > srcALen, output pointer is made to point to the end of the output buffer */ |
emilmont | 1:fdd22bb7aa52 | 113 | /* and the destination pointer modifier, inc is set to -1 */ |
emilmont | 1:fdd22bb7aa52 | 114 | /* If srcALen > srcBLen, zero pad has to be done to srcB to make the two inputs of same length */ |
emilmont | 1:fdd22bb7aa52 | 115 | /* But to improve the performance, |
emilmont | 1:fdd22bb7aa52 | 116 | * we include zeroes in the output instead of zero padding either of the the inputs*/ |
emilmont | 1:fdd22bb7aa52 | 117 | /* If srcALen > srcBLen, |
emilmont | 1:fdd22bb7aa52 | 118 | * (srcALen - srcBLen) zeroes has to included in the starting of the output buffer */ |
emilmont | 1:fdd22bb7aa52 | 119 | /* If srcALen < srcBLen, |
emilmont | 1:fdd22bb7aa52 | 120 | * (srcALen - srcBLen) zeroes has to included in the ending of the output buffer */ |
emilmont | 1:fdd22bb7aa52 | 121 | if(srcALen >= srcBLen) |
emilmont | 1:fdd22bb7aa52 | 122 | { |
emilmont | 1:fdd22bb7aa52 | 123 | /* Initialization of inputA pointer */ |
emilmont | 1:fdd22bb7aa52 | 124 | pIn1 = (pSrcA); |
emilmont | 1:fdd22bb7aa52 | 125 | |
emilmont | 1:fdd22bb7aa52 | 126 | /* Initialization of inputB pointer */ |
emilmont | 1:fdd22bb7aa52 | 127 | pIn2 = (pSrcB); |
emilmont | 1:fdd22bb7aa52 | 128 | |
emilmont | 1:fdd22bb7aa52 | 129 | /* Number of output samples is calculated */ |
emilmont | 1:fdd22bb7aa52 | 130 | outBlockSize = (2u * srcALen) - 1u; |
emilmont | 1:fdd22bb7aa52 | 131 | |
emilmont | 1:fdd22bb7aa52 | 132 | /* When srcALen > srcBLen, zero padding is done to srcB |
emilmont | 1:fdd22bb7aa52 | 133 | * to make their lengths equal. |
emilmont | 1:fdd22bb7aa52 | 134 | * Instead, (outBlockSize - (srcALen + srcBLen - 1)) |
emilmont | 1:fdd22bb7aa52 | 135 | * number of output samples are made zero */ |
emilmont | 1:fdd22bb7aa52 | 136 | j = outBlockSize - (srcALen + (srcBLen - 1u)); |
emilmont | 1:fdd22bb7aa52 | 137 | |
emilmont | 1:fdd22bb7aa52 | 138 | /* Updating the pointer position to non zero value */ |
emilmont | 1:fdd22bb7aa52 | 139 | pOut += j; |
emilmont | 1:fdd22bb7aa52 | 140 | |
emilmont | 1:fdd22bb7aa52 | 141 | } |
emilmont | 1:fdd22bb7aa52 | 142 | else |
emilmont | 1:fdd22bb7aa52 | 143 | { |
emilmont | 1:fdd22bb7aa52 | 144 | /* Initialization of inputA pointer */ |
emilmont | 1:fdd22bb7aa52 | 145 | pIn1 = (pSrcB); |
emilmont | 1:fdd22bb7aa52 | 146 | |
emilmont | 1:fdd22bb7aa52 | 147 | /* Initialization of inputB pointer */ |
emilmont | 1:fdd22bb7aa52 | 148 | pIn2 = (pSrcA); |
emilmont | 1:fdd22bb7aa52 | 149 | |
emilmont | 1:fdd22bb7aa52 | 150 | /* srcBLen is always considered as shorter or equal to srcALen */ |
emilmont | 1:fdd22bb7aa52 | 151 | j = srcBLen; |
emilmont | 1:fdd22bb7aa52 | 152 | srcBLen = srcALen; |
emilmont | 1:fdd22bb7aa52 | 153 | srcALen = j; |
emilmont | 1:fdd22bb7aa52 | 154 | |
emilmont | 1:fdd22bb7aa52 | 155 | /* CORR(x, y) = Reverse order(CORR(y, x)) */ |
emilmont | 1:fdd22bb7aa52 | 156 | /* Hence set the destination pointer to point to the last output sample */ |
emilmont | 1:fdd22bb7aa52 | 157 | pOut = pDst + ((srcALen + srcBLen) - 2u); |
emilmont | 1:fdd22bb7aa52 | 158 | |
emilmont | 1:fdd22bb7aa52 | 159 | /* Destination address modifier is set to -1 */ |
emilmont | 1:fdd22bb7aa52 | 160 | inc = -1; |
emilmont | 1:fdd22bb7aa52 | 161 | |
emilmont | 1:fdd22bb7aa52 | 162 | } |
emilmont | 1:fdd22bb7aa52 | 163 | |
emilmont | 1:fdd22bb7aa52 | 164 | pScr = pScratch; |
emilmont | 1:fdd22bb7aa52 | 165 | |
emilmont | 1:fdd22bb7aa52 | 166 | /* Fill (srcBLen - 1u) zeros in scratch buffer */ |
emilmont | 1:fdd22bb7aa52 | 167 | arm_fill_q15(0, pScr, (srcBLen - 1u)); |
emilmont | 1:fdd22bb7aa52 | 168 | |
emilmont | 1:fdd22bb7aa52 | 169 | /* Update temporary scratch pointer */ |
emilmont | 1:fdd22bb7aa52 | 170 | pScr += (srcBLen - 1u); |
emilmont | 1:fdd22bb7aa52 | 171 | |
emilmont | 1:fdd22bb7aa52 | 172 | #ifndef UNALIGNED_SUPPORT_DISABLE |
emilmont | 1:fdd22bb7aa52 | 173 | |
emilmont | 1:fdd22bb7aa52 | 174 | /* Copy (srcALen) samples in scratch buffer */ |
emilmont | 1:fdd22bb7aa52 | 175 | arm_copy_q15(pIn1, pScr, srcALen); |
emilmont | 1:fdd22bb7aa52 | 176 | |
emilmont | 1:fdd22bb7aa52 | 177 | /* Update pointers */ |
emilmont | 1:fdd22bb7aa52 | 178 | //pIn1 += srcALen; |
emilmont | 1:fdd22bb7aa52 | 179 | pScr += srcALen; |
emilmont | 1:fdd22bb7aa52 | 180 | |
emilmont | 1:fdd22bb7aa52 | 181 | #else |
emilmont | 1:fdd22bb7aa52 | 182 | |
emilmont | 1:fdd22bb7aa52 | 183 | /* Apply loop unrolling and do 4 Copies simultaneously. */ |
emilmont | 1:fdd22bb7aa52 | 184 | j = srcALen >> 2u; |
emilmont | 1:fdd22bb7aa52 | 185 | |
emilmont | 1:fdd22bb7aa52 | 186 | /* First part of the processing with loop unrolling copies 4 data points at a time. |
emilmont | 1:fdd22bb7aa52 | 187 | ** a second loop below copies for the remaining 1 to 3 samples. */ |
emilmont | 1:fdd22bb7aa52 | 188 | while(j > 0u) |
emilmont | 1:fdd22bb7aa52 | 189 | { |
emilmont | 1:fdd22bb7aa52 | 190 | /* copy second buffer in reversal manner */ |
emilmont | 1:fdd22bb7aa52 | 191 | *pScr++ = *pIn1++; |
emilmont | 1:fdd22bb7aa52 | 192 | *pScr++ = *pIn1++; |
emilmont | 1:fdd22bb7aa52 | 193 | *pScr++ = *pIn1++; |
emilmont | 1:fdd22bb7aa52 | 194 | *pScr++ = *pIn1++; |
emilmont | 1:fdd22bb7aa52 | 195 | |
emilmont | 1:fdd22bb7aa52 | 196 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 197 | j--; |
emilmont | 1:fdd22bb7aa52 | 198 | } |
emilmont | 1:fdd22bb7aa52 | 199 | |
emilmont | 1:fdd22bb7aa52 | 200 | /* If the count is not a multiple of 4, copy remaining samples here. |
emilmont | 1:fdd22bb7aa52 | 201 | ** No loop unrolling is used. */ |
emilmont | 1:fdd22bb7aa52 | 202 | j = srcALen % 0x4u; |
emilmont | 1:fdd22bb7aa52 | 203 | |
emilmont | 1:fdd22bb7aa52 | 204 | while(j > 0u) |
emilmont | 1:fdd22bb7aa52 | 205 | { |
emilmont | 1:fdd22bb7aa52 | 206 | /* copy second buffer in reversal manner for remaining samples */ |
emilmont | 1:fdd22bb7aa52 | 207 | *pScr++ = *pIn1++; |
emilmont | 1:fdd22bb7aa52 | 208 | |
emilmont | 1:fdd22bb7aa52 | 209 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 210 | j--; |
emilmont | 1:fdd22bb7aa52 | 211 | } |
emilmont | 1:fdd22bb7aa52 | 212 | |
emilmont | 2:da51fb522205 | 213 | #endif /* #ifndef UNALIGNED_SUPPORT_DISABLE */ |
emilmont | 1:fdd22bb7aa52 | 214 | |
emilmont | 1:fdd22bb7aa52 | 215 | #ifndef UNALIGNED_SUPPORT_DISABLE |
emilmont | 1:fdd22bb7aa52 | 216 | |
emilmont | 1:fdd22bb7aa52 | 217 | /* Fill (srcBLen - 1u) zeros at end of scratch buffer */ |
emilmont | 1:fdd22bb7aa52 | 218 | arm_fill_q15(0, pScr, (srcBLen - 1u)); |
emilmont | 1:fdd22bb7aa52 | 219 | |
emilmont | 1:fdd22bb7aa52 | 220 | /* Update pointer */ |
emilmont | 1:fdd22bb7aa52 | 221 | pScr += (srcBLen - 1u); |
emilmont | 1:fdd22bb7aa52 | 222 | |
emilmont | 1:fdd22bb7aa52 | 223 | #else |
emilmont | 1:fdd22bb7aa52 | 224 | |
emilmont | 1:fdd22bb7aa52 | 225 | /* Apply loop unrolling and do 4 Copies simultaneously. */ |
emilmont | 1:fdd22bb7aa52 | 226 | j = (srcBLen - 1u) >> 2u; |
emilmont | 1:fdd22bb7aa52 | 227 | |
emilmont | 1:fdd22bb7aa52 | 228 | /* First part of the processing with loop unrolling copies 4 data points at a time. |
emilmont | 1:fdd22bb7aa52 | 229 | ** a second loop below copies for the remaining 1 to 3 samples. */ |
emilmont | 1:fdd22bb7aa52 | 230 | while(j > 0u) |
emilmont | 1:fdd22bb7aa52 | 231 | { |
emilmont | 1:fdd22bb7aa52 | 232 | /* copy second buffer in reversal manner */ |
emilmont | 1:fdd22bb7aa52 | 233 | *pScr++ = 0; |
emilmont | 1:fdd22bb7aa52 | 234 | *pScr++ = 0; |
emilmont | 1:fdd22bb7aa52 | 235 | *pScr++ = 0; |
emilmont | 1:fdd22bb7aa52 | 236 | *pScr++ = 0; |
emilmont | 1:fdd22bb7aa52 | 237 | |
emilmont | 1:fdd22bb7aa52 | 238 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 239 | j--; |
emilmont | 1:fdd22bb7aa52 | 240 | } |
emilmont | 1:fdd22bb7aa52 | 241 | |
emilmont | 1:fdd22bb7aa52 | 242 | /* If the count is not a multiple of 4, copy remaining samples here. |
emilmont | 1:fdd22bb7aa52 | 243 | ** No loop unrolling is used. */ |
emilmont | 1:fdd22bb7aa52 | 244 | j = (srcBLen - 1u) % 0x4u; |
emilmont | 1:fdd22bb7aa52 | 245 | |
emilmont | 1:fdd22bb7aa52 | 246 | while(j > 0u) |
emilmont | 1:fdd22bb7aa52 | 247 | { |
emilmont | 1:fdd22bb7aa52 | 248 | /* copy second buffer in reversal manner for remaining samples */ |
emilmont | 1:fdd22bb7aa52 | 249 | *pScr++ = 0; |
emilmont | 1:fdd22bb7aa52 | 250 | |
emilmont | 1:fdd22bb7aa52 | 251 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 252 | j--; |
emilmont | 1:fdd22bb7aa52 | 253 | } |
emilmont | 1:fdd22bb7aa52 | 254 | |
emilmont | 2:da51fb522205 | 255 | #endif /* #ifndef UNALIGNED_SUPPORT_DISABLE */ |
emilmont | 1:fdd22bb7aa52 | 256 | |
emilmont | 1:fdd22bb7aa52 | 257 | /* Temporary pointer for scratch2 */ |
emilmont | 1:fdd22bb7aa52 | 258 | py = pIn2; |
emilmont | 1:fdd22bb7aa52 | 259 | |
emilmont | 1:fdd22bb7aa52 | 260 | |
emilmont | 1:fdd22bb7aa52 | 261 | /* Actual correlation process starts here */ |
emilmont | 1:fdd22bb7aa52 | 262 | blkCnt = (srcALen + srcBLen - 1u) >> 2; |
emilmont | 1:fdd22bb7aa52 | 263 | |
emilmont | 1:fdd22bb7aa52 | 264 | while(blkCnt > 0) |
emilmont | 1:fdd22bb7aa52 | 265 | { |
emilmont | 1:fdd22bb7aa52 | 266 | /* Initialze temporary scratch pointer as scratch1 */ |
emilmont | 1:fdd22bb7aa52 | 267 | pScr = pScratch; |
emilmont | 1:fdd22bb7aa52 | 268 | |
emilmont | 1:fdd22bb7aa52 | 269 | /* Clear Accumlators */ |
emilmont | 1:fdd22bb7aa52 | 270 | acc0 = 0; |
emilmont | 1:fdd22bb7aa52 | 271 | acc1 = 0; |
emilmont | 1:fdd22bb7aa52 | 272 | acc2 = 0; |
emilmont | 1:fdd22bb7aa52 | 273 | acc3 = 0; |
emilmont | 1:fdd22bb7aa52 | 274 | |
emilmont | 1:fdd22bb7aa52 | 275 | /* Read four samples from scratch1 buffer */ |
emilmont | 1:fdd22bb7aa52 | 276 | x1 = *__SIMD32(pScr)++; |
emilmont | 1:fdd22bb7aa52 | 277 | |
emilmont | 1:fdd22bb7aa52 | 278 | /* Read next four samples from scratch1 buffer */ |
emilmont | 1:fdd22bb7aa52 | 279 | x2 = *__SIMD32(pScr)++; |
emilmont | 1:fdd22bb7aa52 | 280 | |
emilmont | 1:fdd22bb7aa52 | 281 | tapCnt = (srcBLen) >> 2u; |
emilmont | 1:fdd22bb7aa52 | 282 | |
emilmont | 1:fdd22bb7aa52 | 283 | while(tapCnt > 0u) |
emilmont | 1:fdd22bb7aa52 | 284 | { |
emilmont | 1:fdd22bb7aa52 | 285 | |
emilmont | 1:fdd22bb7aa52 | 286 | #ifndef UNALIGNED_SUPPORT_DISABLE |
emilmont | 1:fdd22bb7aa52 | 287 | |
emilmont | 1:fdd22bb7aa52 | 288 | /* Read four samples from smaller buffer */ |
emilmont | 1:fdd22bb7aa52 | 289 | y1 = _SIMD32_OFFSET(pIn2); |
emilmont | 1:fdd22bb7aa52 | 290 | y2 = _SIMD32_OFFSET(pIn2 + 2u); |
emilmont | 1:fdd22bb7aa52 | 291 | |
emilmont | 1:fdd22bb7aa52 | 292 | acc0 = __SMLALD(x1, y1, acc0); |
emilmont | 1:fdd22bb7aa52 | 293 | |
emilmont | 1:fdd22bb7aa52 | 294 | acc2 = __SMLALD(x2, y1, acc2); |
emilmont | 1:fdd22bb7aa52 | 295 | |
emilmont | 1:fdd22bb7aa52 | 296 | #ifndef ARM_MATH_BIG_ENDIAN |
emilmont | 1:fdd22bb7aa52 | 297 | x3 = __PKHBT(x2, x1, 0); |
emilmont | 1:fdd22bb7aa52 | 298 | #else |
emilmont | 1:fdd22bb7aa52 | 299 | x3 = __PKHBT(x1, x2, 0); |
emilmont | 1:fdd22bb7aa52 | 300 | #endif |
emilmont | 1:fdd22bb7aa52 | 301 | |
emilmont | 1:fdd22bb7aa52 | 302 | acc1 = __SMLALDX(x3, y1, acc1); |
emilmont | 1:fdd22bb7aa52 | 303 | |
emilmont | 1:fdd22bb7aa52 | 304 | x1 = _SIMD32_OFFSET(pScr); |
emilmont | 1:fdd22bb7aa52 | 305 | |
emilmont | 1:fdd22bb7aa52 | 306 | acc0 = __SMLALD(x2, y2, acc0); |
emilmont | 1:fdd22bb7aa52 | 307 | |
emilmont | 1:fdd22bb7aa52 | 308 | acc2 = __SMLALD(x1, y2, acc2); |
emilmont | 1:fdd22bb7aa52 | 309 | |
emilmont | 1:fdd22bb7aa52 | 310 | #ifndef ARM_MATH_BIG_ENDIAN |
emilmont | 1:fdd22bb7aa52 | 311 | x3 = __PKHBT(x1, x2, 0); |
emilmont | 1:fdd22bb7aa52 | 312 | #else |
emilmont | 1:fdd22bb7aa52 | 313 | x3 = __PKHBT(x2, x1, 0); |
emilmont | 1:fdd22bb7aa52 | 314 | #endif |
emilmont | 1:fdd22bb7aa52 | 315 | |
emilmont | 1:fdd22bb7aa52 | 316 | acc3 = __SMLALDX(x3, y1, acc3); |
emilmont | 1:fdd22bb7aa52 | 317 | |
emilmont | 1:fdd22bb7aa52 | 318 | acc1 = __SMLALDX(x3, y2, acc1); |
emilmont | 1:fdd22bb7aa52 | 319 | |
emilmont | 1:fdd22bb7aa52 | 320 | x2 = _SIMD32_OFFSET(pScr + 2u); |
emilmont | 1:fdd22bb7aa52 | 321 | |
emilmont | 1:fdd22bb7aa52 | 322 | #ifndef ARM_MATH_BIG_ENDIAN |
emilmont | 1:fdd22bb7aa52 | 323 | x3 = __PKHBT(x2, x1, 0); |
emilmont | 1:fdd22bb7aa52 | 324 | #else |
emilmont | 1:fdd22bb7aa52 | 325 | x3 = __PKHBT(x1, x2, 0); |
emilmont | 1:fdd22bb7aa52 | 326 | #endif |
emilmont | 1:fdd22bb7aa52 | 327 | |
emilmont | 1:fdd22bb7aa52 | 328 | acc3 = __SMLALDX(x3, y2, acc3); |
emilmont | 1:fdd22bb7aa52 | 329 | |
emilmont | 2:da51fb522205 | 330 | #else |
emilmont | 1:fdd22bb7aa52 | 331 | |
emilmont | 1:fdd22bb7aa52 | 332 | /* Read four samples from smaller buffer */ |
emilmont | 2:da51fb522205 | 333 | a = *pIn2; |
emilmont | 2:da51fb522205 | 334 | b = *(pIn2 + 1); |
emilmont | 1:fdd22bb7aa52 | 335 | |
emilmont | 1:fdd22bb7aa52 | 336 | #ifndef ARM_MATH_BIG_ENDIAN |
emilmont | 1:fdd22bb7aa52 | 337 | y1 = __PKHBT(a, b, 16); |
emilmont | 1:fdd22bb7aa52 | 338 | #else |
emilmont | 1:fdd22bb7aa52 | 339 | y1 = __PKHBT(b, a, 16); |
emilmont | 1:fdd22bb7aa52 | 340 | #endif |
emilmont | 2:da51fb522205 | 341 | |
emilmont | 2:da51fb522205 | 342 | a = *(pIn2 + 2); |
emilmont | 2:da51fb522205 | 343 | b = *(pIn2 + 3); |
emilmont | 1:fdd22bb7aa52 | 344 | #ifndef ARM_MATH_BIG_ENDIAN |
emilmont | 1:fdd22bb7aa52 | 345 | y2 = __PKHBT(a, b, 16); |
emilmont | 1:fdd22bb7aa52 | 346 | #else |
emilmont | 1:fdd22bb7aa52 | 347 | y2 = __PKHBT(b, a, 16); |
emilmont | 2:da51fb522205 | 348 | #endif |
emilmont | 1:fdd22bb7aa52 | 349 | |
emilmont | 1:fdd22bb7aa52 | 350 | acc0 = __SMLALD(x1, y1, acc0); |
emilmont | 1:fdd22bb7aa52 | 351 | |
emilmont | 1:fdd22bb7aa52 | 352 | acc2 = __SMLALD(x2, y1, acc2); |
emilmont | 1:fdd22bb7aa52 | 353 | |
emilmont | 1:fdd22bb7aa52 | 354 | #ifndef ARM_MATH_BIG_ENDIAN |
emilmont | 1:fdd22bb7aa52 | 355 | x3 = __PKHBT(x2, x1, 0); |
emilmont | 1:fdd22bb7aa52 | 356 | #else |
emilmont | 1:fdd22bb7aa52 | 357 | x3 = __PKHBT(x1, x2, 0); |
emilmont | 1:fdd22bb7aa52 | 358 | #endif |
emilmont | 1:fdd22bb7aa52 | 359 | |
emilmont | 1:fdd22bb7aa52 | 360 | acc1 = __SMLALDX(x3, y1, acc1); |
emilmont | 1:fdd22bb7aa52 | 361 | |
emilmont | 2:da51fb522205 | 362 | a = *pScr; |
emilmont | 2:da51fb522205 | 363 | b = *(pScr + 1); |
emilmont | 1:fdd22bb7aa52 | 364 | |
emilmont | 1:fdd22bb7aa52 | 365 | #ifndef ARM_MATH_BIG_ENDIAN |
emilmont | 1:fdd22bb7aa52 | 366 | x1 = __PKHBT(a, b, 16); |
emilmont | 1:fdd22bb7aa52 | 367 | #else |
emilmont | 1:fdd22bb7aa52 | 368 | x1 = __PKHBT(b, a, 16); |
emilmont | 1:fdd22bb7aa52 | 369 | #endif |
emilmont | 1:fdd22bb7aa52 | 370 | |
emilmont | 1:fdd22bb7aa52 | 371 | acc0 = __SMLALD(x2, y2, acc0); |
emilmont | 1:fdd22bb7aa52 | 372 | |
emilmont | 1:fdd22bb7aa52 | 373 | acc2 = __SMLALD(x1, y2, acc2); |
emilmont | 1:fdd22bb7aa52 | 374 | |
emilmont | 1:fdd22bb7aa52 | 375 | #ifndef ARM_MATH_BIG_ENDIAN |
emilmont | 1:fdd22bb7aa52 | 376 | x3 = __PKHBT(x1, x2, 0); |
emilmont | 1:fdd22bb7aa52 | 377 | #else |
emilmont | 1:fdd22bb7aa52 | 378 | x3 = __PKHBT(x2, x1, 0); |
emilmont | 1:fdd22bb7aa52 | 379 | #endif |
emilmont | 1:fdd22bb7aa52 | 380 | |
emilmont | 1:fdd22bb7aa52 | 381 | acc3 = __SMLALDX(x3, y1, acc3); |
emilmont | 1:fdd22bb7aa52 | 382 | |
emilmont | 1:fdd22bb7aa52 | 383 | acc1 = __SMLALDX(x3, y2, acc1); |
emilmont | 1:fdd22bb7aa52 | 384 | |
emilmont | 2:da51fb522205 | 385 | a = *(pScr + 2); |
emilmont | 2:da51fb522205 | 386 | b = *(pScr + 3); |
emilmont | 1:fdd22bb7aa52 | 387 | |
emilmont | 1:fdd22bb7aa52 | 388 | #ifndef ARM_MATH_BIG_ENDIAN |
emilmont | 1:fdd22bb7aa52 | 389 | x2 = __PKHBT(a, b, 16); |
emilmont | 1:fdd22bb7aa52 | 390 | #else |
emilmont | 1:fdd22bb7aa52 | 391 | x2 = __PKHBT(b, a, 16); |
emilmont | 1:fdd22bb7aa52 | 392 | #endif |
emilmont | 1:fdd22bb7aa52 | 393 | |
emilmont | 1:fdd22bb7aa52 | 394 | #ifndef ARM_MATH_BIG_ENDIAN |
emilmont | 1:fdd22bb7aa52 | 395 | x3 = __PKHBT(x2, x1, 0); |
emilmont | 1:fdd22bb7aa52 | 396 | #else |
emilmont | 1:fdd22bb7aa52 | 397 | x3 = __PKHBT(x1, x2, 0); |
emilmont | 1:fdd22bb7aa52 | 398 | #endif |
emilmont | 1:fdd22bb7aa52 | 399 | |
emilmont | 1:fdd22bb7aa52 | 400 | acc3 = __SMLALDX(x3, y2, acc3); |
emilmont | 1:fdd22bb7aa52 | 401 | |
emilmont | 2:da51fb522205 | 402 | #endif /* #ifndef UNALIGNED_SUPPORT_DISABLE */ |
emilmont | 1:fdd22bb7aa52 | 403 | |
emilmont | 1:fdd22bb7aa52 | 404 | pIn2 += 4u; |
emilmont | 1:fdd22bb7aa52 | 405 | |
emilmont | 1:fdd22bb7aa52 | 406 | pScr += 4u; |
emilmont | 1:fdd22bb7aa52 | 407 | |
emilmont | 1:fdd22bb7aa52 | 408 | |
emilmont | 1:fdd22bb7aa52 | 409 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 410 | tapCnt--; |
emilmont | 1:fdd22bb7aa52 | 411 | } |
emilmont | 1:fdd22bb7aa52 | 412 | |
emilmont | 1:fdd22bb7aa52 | 413 | |
emilmont | 1:fdd22bb7aa52 | 414 | |
emilmont | 1:fdd22bb7aa52 | 415 | /* Update scratch pointer for remaining samples of smaller length sequence */ |
emilmont | 1:fdd22bb7aa52 | 416 | pScr -= 4u; |
emilmont | 1:fdd22bb7aa52 | 417 | |
emilmont | 1:fdd22bb7aa52 | 418 | |
emilmont | 1:fdd22bb7aa52 | 419 | /* apply same above for remaining samples of smaller length sequence */ |
emilmont | 1:fdd22bb7aa52 | 420 | tapCnt = (srcBLen) & 3u; |
emilmont | 1:fdd22bb7aa52 | 421 | |
emilmont | 1:fdd22bb7aa52 | 422 | while(tapCnt > 0u) |
emilmont | 1:fdd22bb7aa52 | 423 | { |
emilmont | 1:fdd22bb7aa52 | 424 | |
emilmont | 1:fdd22bb7aa52 | 425 | /* accumlate the results */ |
emilmont | 1:fdd22bb7aa52 | 426 | acc0 += (*pScr++ * *pIn2); |
emilmont | 1:fdd22bb7aa52 | 427 | acc1 += (*pScr++ * *pIn2); |
emilmont | 1:fdd22bb7aa52 | 428 | acc2 += (*pScr++ * *pIn2); |
emilmont | 1:fdd22bb7aa52 | 429 | acc3 += (*pScr++ * *pIn2++); |
emilmont | 1:fdd22bb7aa52 | 430 | |
emilmont | 1:fdd22bb7aa52 | 431 | pScr -= 3u; |
emilmont | 1:fdd22bb7aa52 | 432 | |
emilmont | 1:fdd22bb7aa52 | 433 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 434 | tapCnt--; |
emilmont | 1:fdd22bb7aa52 | 435 | } |
emilmont | 1:fdd22bb7aa52 | 436 | |
emilmont | 1:fdd22bb7aa52 | 437 | blkCnt--; |
emilmont | 1:fdd22bb7aa52 | 438 | |
emilmont | 1:fdd22bb7aa52 | 439 | |
emilmont | 1:fdd22bb7aa52 | 440 | /* Store the results in the accumulators in the destination buffer. */ |
emilmont | 1:fdd22bb7aa52 | 441 | *pOut = (__SSAT(acc0 >> 15u, 16)); |
emilmont | 1:fdd22bb7aa52 | 442 | pOut += inc; |
emilmont | 1:fdd22bb7aa52 | 443 | *pOut = (__SSAT(acc1 >> 15u, 16)); |
emilmont | 1:fdd22bb7aa52 | 444 | pOut += inc; |
emilmont | 1:fdd22bb7aa52 | 445 | *pOut = (__SSAT(acc2 >> 15u, 16)); |
emilmont | 1:fdd22bb7aa52 | 446 | pOut += inc; |
emilmont | 1:fdd22bb7aa52 | 447 | *pOut = (__SSAT(acc3 >> 15u, 16)); |
emilmont | 1:fdd22bb7aa52 | 448 | pOut += inc; |
emilmont | 1:fdd22bb7aa52 | 449 | |
emilmont | 1:fdd22bb7aa52 | 450 | /* Initialization of inputB pointer */ |
emilmont | 1:fdd22bb7aa52 | 451 | pIn2 = py; |
emilmont | 1:fdd22bb7aa52 | 452 | |
emilmont | 1:fdd22bb7aa52 | 453 | pScratch += 4u; |
emilmont | 1:fdd22bb7aa52 | 454 | |
emilmont | 1:fdd22bb7aa52 | 455 | } |
emilmont | 1:fdd22bb7aa52 | 456 | |
emilmont | 1:fdd22bb7aa52 | 457 | |
emilmont | 1:fdd22bb7aa52 | 458 | blkCnt = (srcALen + srcBLen - 1u) & 0x3; |
emilmont | 1:fdd22bb7aa52 | 459 | |
emilmont | 1:fdd22bb7aa52 | 460 | /* Calculate correlation for remaining samples of Bigger length sequence */ |
emilmont | 1:fdd22bb7aa52 | 461 | while(blkCnt > 0) |
emilmont | 1:fdd22bb7aa52 | 462 | { |
emilmont | 1:fdd22bb7aa52 | 463 | /* Initialze temporary scratch pointer as scratch1 */ |
emilmont | 1:fdd22bb7aa52 | 464 | pScr = pScratch; |
emilmont | 1:fdd22bb7aa52 | 465 | |
emilmont | 1:fdd22bb7aa52 | 466 | /* Clear Accumlators */ |
emilmont | 1:fdd22bb7aa52 | 467 | acc0 = 0; |
emilmont | 1:fdd22bb7aa52 | 468 | |
emilmont | 1:fdd22bb7aa52 | 469 | tapCnt = (srcBLen) >> 1u; |
emilmont | 1:fdd22bb7aa52 | 470 | |
emilmont | 1:fdd22bb7aa52 | 471 | while(tapCnt > 0u) |
emilmont | 1:fdd22bb7aa52 | 472 | { |
emilmont | 1:fdd22bb7aa52 | 473 | |
emilmont | 1:fdd22bb7aa52 | 474 | acc0 += (*pScr++ * *pIn2++); |
emilmont | 1:fdd22bb7aa52 | 475 | acc0 += (*pScr++ * *pIn2++); |
emilmont | 1:fdd22bb7aa52 | 476 | |
emilmont | 1:fdd22bb7aa52 | 477 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 478 | tapCnt--; |
emilmont | 1:fdd22bb7aa52 | 479 | } |
emilmont | 1:fdd22bb7aa52 | 480 | |
emilmont | 1:fdd22bb7aa52 | 481 | tapCnt = (srcBLen) & 1u; |
emilmont | 1:fdd22bb7aa52 | 482 | |
emilmont | 1:fdd22bb7aa52 | 483 | /* apply same above for remaining samples of smaller length sequence */ |
emilmont | 1:fdd22bb7aa52 | 484 | while(tapCnt > 0u) |
emilmont | 1:fdd22bb7aa52 | 485 | { |
emilmont | 1:fdd22bb7aa52 | 486 | |
emilmont | 1:fdd22bb7aa52 | 487 | /* accumlate the results */ |
emilmont | 1:fdd22bb7aa52 | 488 | acc0 += (*pScr++ * *pIn2++); |
emilmont | 1:fdd22bb7aa52 | 489 | |
emilmont | 1:fdd22bb7aa52 | 490 | /* Decrement the loop counter */ |
emilmont | 1:fdd22bb7aa52 | 491 | tapCnt--; |
emilmont | 1:fdd22bb7aa52 | 492 | } |
emilmont | 1:fdd22bb7aa52 | 493 | |
emilmont | 1:fdd22bb7aa52 | 494 | blkCnt--; |
emilmont | 1:fdd22bb7aa52 | 495 | |
emilmont | 1:fdd22bb7aa52 | 496 | /* Store the result in the accumulator in the destination buffer. */ |
emilmont | 1:fdd22bb7aa52 | 497 | *pOut = (q15_t) (__SSAT((acc0 >> 15), 16)); |
emilmont | 1:fdd22bb7aa52 | 498 | |
emilmont | 1:fdd22bb7aa52 | 499 | pOut += inc; |
emilmont | 1:fdd22bb7aa52 | 500 | |
emilmont | 1:fdd22bb7aa52 | 501 | /* Initialization of inputB pointer */ |
emilmont | 1:fdd22bb7aa52 | 502 | pIn2 = py; |
emilmont | 1:fdd22bb7aa52 | 503 | |
emilmont | 1:fdd22bb7aa52 | 504 | pScratch += 1u; |
emilmont | 1:fdd22bb7aa52 | 505 | |
emilmont | 1:fdd22bb7aa52 | 506 | } |
emilmont | 1:fdd22bb7aa52 | 507 | |
emilmont | 1:fdd22bb7aa52 | 508 | |
emilmont | 1:fdd22bb7aa52 | 509 | } |
emilmont | 1:fdd22bb7aa52 | 510 | |
emilmont | 1:fdd22bb7aa52 | 511 | /** |
emilmont | 1:fdd22bb7aa52 | 512 | * @} end of Corr group |
emilmont | 1:fdd22bb7aa52 | 513 | */ |