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functions/FilteringFunctions/arm_conv_partial_fast_q15.c@3:4098b9d3d571, 2018-06-21 (annotated)
- Committer:
- xorjoep
- Date:
- Thu Jun 21 11:56:27 2018 +0000
- Revision:
- 3:4098b9d3d571
- Parent:
- 1:24714b45cd1b
headers is a folder not a library
Who changed what in which revision?
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xorjoep | 1:24714b45cd1b | 1 | /* ---------------------------------------------------------------------- |
xorjoep | 1:24714b45cd1b | 2 | * Project: CMSIS DSP Library |
xorjoep | 1:24714b45cd1b | 3 | * Title: arm_conv_partial_fast_q15.c |
xorjoep | 1:24714b45cd1b | 4 | * Description: Fast Q15 Partial convolution |
xorjoep | 1:24714b45cd1b | 5 | * |
xorjoep | 1:24714b45cd1b | 6 | * $Date: 27. January 2017 |
xorjoep | 1:24714b45cd1b | 7 | * $Revision: V.1.5.1 |
xorjoep | 1:24714b45cd1b | 8 | * |
xorjoep | 1:24714b45cd1b | 9 | * Target Processor: Cortex-M cores |
xorjoep | 1:24714b45cd1b | 10 | * -------------------------------------------------------------------- */ |
xorjoep | 1:24714b45cd1b | 11 | /* |
xorjoep | 1:24714b45cd1b | 12 | * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. |
xorjoep | 1:24714b45cd1b | 13 | * |
xorjoep | 1:24714b45cd1b | 14 | * SPDX-License-Identifier: Apache-2.0 |
xorjoep | 1:24714b45cd1b | 15 | * |
xorjoep | 1:24714b45cd1b | 16 | * Licensed under the Apache License, Version 2.0 (the License); you may |
xorjoep | 1:24714b45cd1b | 17 | * not use this file except in compliance with the License. |
xorjoep | 1:24714b45cd1b | 18 | * You may obtain a copy of the License at |
xorjoep | 1:24714b45cd1b | 19 | * |
xorjoep | 1:24714b45cd1b | 20 | * www.apache.org/licenses/LICENSE-2.0 |
xorjoep | 1:24714b45cd1b | 21 | * |
xorjoep | 1:24714b45cd1b | 22 | * Unless required by applicable law or agreed to in writing, software |
xorjoep | 1:24714b45cd1b | 23 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
xorjoep | 1:24714b45cd1b | 24 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
xorjoep | 1:24714b45cd1b | 25 | * See the License for the specific language governing permissions and |
xorjoep | 1:24714b45cd1b | 26 | * limitations under the License. |
xorjoep | 1:24714b45cd1b | 27 | */ |
xorjoep | 1:24714b45cd1b | 28 | |
xorjoep | 1:24714b45cd1b | 29 | #include "arm_math.h" |
xorjoep | 1:24714b45cd1b | 30 | |
xorjoep | 1:24714b45cd1b | 31 | /** |
xorjoep | 1:24714b45cd1b | 32 | * @ingroup groupFilters |
xorjoep | 1:24714b45cd1b | 33 | */ |
xorjoep | 1:24714b45cd1b | 34 | |
xorjoep | 1:24714b45cd1b | 35 | /** |
xorjoep | 1:24714b45cd1b | 36 | * @addtogroup PartialConv |
xorjoep | 1:24714b45cd1b | 37 | * @{ |
xorjoep | 1:24714b45cd1b | 38 | */ |
xorjoep | 1:24714b45cd1b | 39 | |
xorjoep | 1:24714b45cd1b | 40 | /** |
xorjoep | 1:24714b45cd1b | 41 | * @brief Partial convolution of Q15 sequences (fast version) for Cortex-M3 and Cortex-M4. |
xorjoep | 1:24714b45cd1b | 42 | * @param[in] *pSrcA points to the first input sequence. |
xorjoep | 1:24714b45cd1b | 43 | * @param[in] srcALen length of the first input sequence. |
xorjoep | 1:24714b45cd1b | 44 | * @param[in] *pSrcB points to the second input sequence. |
xorjoep | 1:24714b45cd1b | 45 | * @param[in] srcBLen length of the second input sequence. |
xorjoep | 1:24714b45cd1b | 46 | * @param[out] *pDst points to the location where the output result is written. |
xorjoep | 1:24714b45cd1b | 47 | * @param[in] firstIndex is the first output sample to start with. |
xorjoep | 1:24714b45cd1b | 48 | * @param[in] numPoints is the number of output points to be computed. |
xorjoep | 1:24714b45cd1b | 49 | * @return Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2]. |
xorjoep | 1:24714b45cd1b | 50 | * |
xorjoep | 1:24714b45cd1b | 51 | * See <code>arm_conv_partial_q15()</code> for a slower implementation of this function which uses a 64-bit accumulator to avoid wrap around distortion. |
xorjoep | 1:24714b45cd1b | 52 | */ |
xorjoep | 1:24714b45cd1b | 53 | |
xorjoep | 1:24714b45cd1b | 54 | |
xorjoep | 1:24714b45cd1b | 55 | arm_status arm_conv_partial_fast_q15( |
xorjoep | 1:24714b45cd1b | 56 | q15_t * pSrcA, |
xorjoep | 1:24714b45cd1b | 57 | uint32_t srcALen, |
xorjoep | 1:24714b45cd1b | 58 | q15_t * pSrcB, |
xorjoep | 1:24714b45cd1b | 59 | uint32_t srcBLen, |
xorjoep | 1:24714b45cd1b | 60 | q15_t * pDst, |
xorjoep | 1:24714b45cd1b | 61 | uint32_t firstIndex, |
xorjoep | 1:24714b45cd1b | 62 | uint32_t numPoints) |
xorjoep | 1:24714b45cd1b | 63 | { |
xorjoep | 1:24714b45cd1b | 64 | #ifndef UNALIGNED_SUPPORT_DISABLE |
xorjoep | 1:24714b45cd1b | 65 | |
xorjoep | 1:24714b45cd1b | 66 | q15_t *pIn1; /* inputA pointer */ |
xorjoep | 1:24714b45cd1b | 67 | q15_t *pIn2; /* inputB pointer */ |
xorjoep | 1:24714b45cd1b | 68 | q15_t *pOut = pDst; /* output pointer */ |
xorjoep | 1:24714b45cd1b | 69 | q31_t sum, acc0, acc1, acc2, acc3; /* Accumulator */ |
xorjoep | 1:24714b45cd1b | 70 | q15_t *px; /* Intermediate inputA pointer */ |
xorjoep | 1:24714b45cd1b | 71 | q15_t *py; /* Intermediate inputB pointer */ |
xorjoep | 1:24714b45cd1b | 72 | q15_t *pSrc1, *pSrc2; /* Intermediate pointers */ |
xorjoep | 1:24714b45cd1b | 73 | q31_t x0, x1, x2, x3, c0; |
xorjoep | 1:24714b45cd1b | 74 | uint32_t j, k, count, check, blkCnt; |
xorjoep | 1:24714b45cd1b | 75 | int32_t blockSize1, blockSize2, blockSize3; /* loop counters */ |
xorjoep | 1:24714b45cd1b | 76 | arm_status status; /* status of Partial convolution */ |
xorjoep | 1:24714b45cd1b | 77 | |
xorjoep | 1:24714b45cd1b | 78 | /* Check for range of output samples to be calculated */ |
xorjoep | 1:24714b45cd1b | 79 | if ((firstIndex + numPoints) > ((srcALen + (srcBLen - 1U)))) |
xorjoep | 1:24714b45cd1b | 80 | { |
xorjoep | 1:24714b45cd1b | 81 | /* Set status as ARM_MATH_ARGUMENT_ERROR */ |
xorjoep | 1:24714b45cd1b | 82 | status = ARM_MATH_ARGUMENT_ERROR; |
xorjoep | 1:24714b45cd1b | 83 | } |
xorjoep | 1:24714b45cd1b | 84 | else |
xorjoep | 1:24714b45cd1b | 85 | { |
xorjoep | 1:24714b45cd1b | 86 | |
xorjoep | 1:24714b45cd1b | 87 | /* The algorithm implementation is based on the lengths of the inputs. */ |
xorjoep | 1:24714b45cd1b | 88 | /* srcB is always made to slide across srcA. */ |
xorjoep | 1:24714b45cd1b | 89 | /* So srcBLen is always considered as shorter or equal to srcALen */ |
xorjoep | 1:24714b45cd1b | 90 | if (srcALen >=srcBLen) |
xorjoep | 1:24714b45cd1b | 91 | { |
xorjoep | 1:24714b45cd1b | 92 | /* Initialization of inputA pointer */ |
xorjoep | 1:24714b45cd1b | 93 | pIn1 = pSrcA; |
xorjoep | 1:24714b45cd1b | 94 | |
xorjoep | 1:24714b45cd1b | 95 | /* Initialization of inputB pointer */ |
xorjoep | 1:24714b45cd1b | 96 | pIn2 = pSrcB; |
xorjoep | 1:24714b45cd1b | 97 | } |
xorjoep | 1:24714b45cd1b | 98 | else |
xorjoep | 1:24714b45cd1b | 99 | { |
xorjoep | 1:24714b45cd1b | 100 | /* Initialization of inputA pointer */ |
xorjoep | 1:24714b45cd1b | 101 | pIn1 = pSrcB; |
xorjoep | 1:24714b45cd1b | 102 | |
xorjoep | 1:24714b45cd1b | 103 | /* Initialization of inputB pointer */ |
xorjoep | 1:24714b45cd1b | 104 | pIn2 = pSrcA; |
xorjoep | 1:24714b45cd1b | 105 | |
xorjoep | 1:24714b45cd1b | 106 | /* srcBLen is always considered as shorter or equal to srcALen */ |
xorjoep | 1:24714b45cd1b | 107 | j = srcBLen; |
xorjoep | 1:24714b45cd1b | 108 | srcBLen = srcALen; |
xorjoep | 1:24714b45cd1b | 109 | srcALen = j; |
xorjoep | 1:24714b45cd1b | 110 | } |
xorjoep | 1:24714b45cd1b | 111 | |
xorjoep | 1:24714b45cd1b | 112 | /* Conditions to check which loopCounter holds |
xorjoep | 1:24714b45cd1b | 113 | * the first and last indices of the output samples to be calculated. */ |
xorjoep | 1:24714b45cd1b | 114 | check = firstIndex + numPoints; |
xorjoep | 1:24714b45cd1b | 115 | blockSize3 = ((int32_t)check > (int32_t)srcALen) ? (int32_t)check - (int32_t)srcALen : 0; |
xorjoep | 1:24714b45cd1b | 116 | blockSize3 = ((int32_t)firstIndex > (int32_t)srcALen - 1) ? blockSize3 - (int32_t)firstIndex + (int32_t)srcALen : blockSize3; |
xorjoep | 1:24714b45cd1b | 117 | blockSize1 = (((int32_t) srcBLen - 1) - (int32_t) firstIndex); |
xorjoep | 1:24714b45cd1b | 118 | blockSize1 = (blockSize1 > 0) ? ((check > (srcBLen - 1U)) ? blockSize1 : |
xorjoep | 1:24714b45cd1b | 119 | (int32_t) numPoints) : 0; |
xorjoep | 1:24714b45cd1b | 120 | blockSize2 = (int32_t) check - ((blockSize3 + blockSize1) + |
xorjoep | 1:24714b45cd1b | 121 | (int32_t) firstIndex); |
xorjoep | 1:24714b45cd1b | 122 | blockSize2 = (blockSize2 > 0) ? blockSize2 : 0; |
xorjoep | 1:24714b45cd1b | 123 | |
xorjoep | 1:24714b45cd1b | 124 | /* conv(x,y) at n = x[n] * y[0] + x[n-1] * y[1] + x[n-2] * y[2] + ...+ x[n-N+1] * y[N -1] */ |
xorjoep | 1:24714b45cd1b | 125 | /* The function is internally |
xorjoep | 1:24714b45cd1b | 126 | * divided into three stages according to the number of multiplications that has to be |
xorjoep | 1:24714b45cd1b | 127 | * taken place between inputA samples and inputB samples. In the first stage of the |
xorjoep | 1:24714b45cd1b | 128 | * algorithm, the multiplications increase by one for every iteration. |
xorjoep | 1:24714b45cd1b | 129 | * In the second stage of the algorithm, srcBLen number of multiplications are done. |
xorjoep | 1:24714b45cd1b | 130 | * In the third stage of the algorithm, the multiplications decrease by one |
xorjoep | 1:24714b45cd1b | 131 | * for every iteration. */ |
xorjoep | 1:24714b45cd1b | 132 | |
xorjoep | 1:24714b45cd1b | 133 | /* Set the output pointer to point to the firstIndex |
xorjoep | 1:24714b45cd1b | 134 | * of the output sample to be calculated. */ |
xorjoep | 1:24714b45cd1b | 135 | pOut = pDst + firstIndex; |
xorjoep | 1:24714b45cd1b | 136 | |
xorjoep | 1:24714b45cd1b | 137 | /* -------------------------- |
xorjoep | 1:24714b45cd1b | 138 | * Initializations of stage1 |
xorjoep | 1:24714b45cd1b | 139 | * -------------------------*/ |
xorjoep | 1:24714b45cd1b | 140 | |
xorjoep | 1:24714b45cd1b | 141 | /* sum = x[0] * y[0] |
xorjoep | 1:24714b45cd1b | 142 | * sum = x[0] * y[1] + x[1] * y[0] |
xorjoep | 1:24714b45cd1b | 143 | * .... |
xorjoep | 1:24714b45cd1b | 144 | * sum = x[0] * y[srcBlen - 1] + x[1] * y[srcBlen - 2] +...+ x[srcBLen - 1] * y[0] |
xorjoep | 1:24714b45cd1b | 145 | */ |
xorjoep | 1:24714b45cd1b | 146 | |
xorjoep | 1:24714b45cd1b | 147 | /* In this stage the MAC operations are increased by 1 for every iteration. |
xorjoep | 1:24714b45cd1b | 148 | The count variable holds the number of MAC operations performed. |
xorjoep | 1:24714b45cd1b | 149 | Since the partial convolution starts from firstIndex |
xorjoep | 1:24714b45cd1b | 150 | Number of Macs to be performed is firstIndex + 1 */ |
xorjoep | 1:24714b45cd1b | 151 | count = 1U + firstIndex; |
xorjoep | 1:24714b45cd1b | 152 | |
xorjoep | 1:24714b45cd1b | 153 | /* Working pointer of inputA */ |
xorjoep | 1:24714b45cd1b | 154 | px = pIn1; |
xorjoep | 1:24714b45cd1b | 155 | |
xorjoep | 1:24714b45cd1b | 156 | /* Working pointer of inputB */ |
xorjoep | 1:24714b45cd1b | 157 | pSrc2 = pIn2 + firstIndex; |
xorjoep | 1:24714b45cd1b | 158 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 159 | |
xorjoep | 1:24714b45cd1b | 160 | /* ------------------------ |
xorjoep | 1:24714b45cd1b | 161 | * Stage1 process |
xorjoep | 1:24714b45cd1b | 162 | * ----------------------*/ |
xorjoep | 1:24714b45cd1b | 163 | |
xorjoep | 1:24714b45cd1b | 164 | /* For loop unrolling by 4, this stage is divided into two. */ |
xorjoep | 1:24714b45cd1b | 165 | /* First part of this stage computes the MAC operations less than 4 */ |
xorjoep | 1:24714b45cd1b | 166 | /* Second part of this stage computes the MAC operations greater than or equal to 4 */ |
xorjoep | 1:24714b45cd1b | 167 | |
xorjoep | 1:24714b45cd1b | 168 | /* The first part of the stage starts here */ |
xorjoep | 1:24714b45cd1b | 169 | while ((count < 4U) && (blockSize1 > 0)) |
xorjoep | 1:24714b45cd1b | 170 | { |
xorjoep | 1:24714b45cd1b | 171 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 172 | sum = 0; |
xorjoep | 1:24714b45cd1b | 173 | |
xorjoep | 1:24714b45cd1b | 174 | /* Loop over number of MAC operations between |
xorjoep | 1:24714b45cd1b | 175 | * inputA samples and inputB samples */ |
xorjoep | 1:24714b45cd1b | 176 | k = count; |
xorjoep | 1:24714b45cd1b | 177 | |
xorjoep | 1:24714b45cd1b | 178 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 179 | { |
xorjoep | 1:24714b45cd1b | 180 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 181 | sum = __SMLAD(*px++, *py--, sum); |
xorjoep | 1:24714b45cd1b | 182 | |
xorjoep | 1:24714b45cd1b | 183 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 184 | k--; |
xorjoep | 1:24714b45cd1b | 185 | } |
xorjoep | 1:24714b45cd1b | 186 | |
xorjoep | 1:24714b45cd1b | 187 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 188 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 189 | |
xorjoep | 1:24714b45cd1b | 190 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 191 | py = ++pSrc2; |
xorjoep | 1:24714b45cd1b | 192 | px = pIn1; |
xorjoep | 1:24714b45cd1b | 193 | |
xorjoep | 1:24714b45cd1b | 194 | /* Increment the MAC count */ |
xorjoep | 1:24714b45cd1b | 195 | count++; |
xorjoep | 1:24714b45cd1b | 196 | |
xorjoep | 1:24714b45cd1b | 197 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 198 | blockSize1--; |
xorjoep | 1:24714b45cd1b | 199 | } |
xorjoep | 1:24714b45cd1b | 200 | |
xorjoep | 1:24714b45cd1b | 201 | /* The second part of the stage starts here */ |
xorjoep | 1:24714b45cd1b | 202 | /* The internal loop, over count, is unrolled by 4 */ |
xorjoep | 1:24714b45cd1b | 203 | /* To, read the last two inputB samples using SIMD: |
xorjoep | 1:24714b45cd1b | 204 | * y[srcBLen] and y[srcBLen-1] coefficients, py is decremented by 1 */ |
xorjoep | 1:24714b45cd1b | 205 | py = py - 1; |
xorjoep | 1:24714b45cd1b | 206 | |
xorjoep | 1:24714b45cd1b | 207 | while (blockSize1 > 0) |
xorjoep | 1:24714b45cd1b | 208 | { |
xorjoep | 1:24714b45cd1b | 209 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 210 | sum = 0; |
xorjoep | 1:24714b45cd1b | 211 | |
xorjoep | 1:24714b45cd1b | 212 | /* Apply loop unrolling and compute 4 MACs simultaneously. */ |
xorjoep | 1:24714b45cd1b | 213 | k = count >> 2U; |
xorjoep | 1:24714b45cd1b | 214 | |
xorjoep | 1:24714b45cd1b | 215 | /* First part of the processing with loop unrolling. Compute 4 MACs at a time. |
xorjoep | 1:24714b45cd1b | 216 | ** a second loop below computes MACs for the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 217 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 218 | { |
xorjoep | 1:24714b45cd1b | 219 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 220 | /* x[0], x[1] are multiplied with y[srcBLen - 1], y[srcBLen - 2] respectively */ |
xorjoep | 1:24714b45cd1b | 221 | sum = __SMLADX(*__SIMD32(px)++, *__SIMD32(py)--, sum); |
xorjoep | 1:24714b45cd1b | 222 | /* x[2], x[3] are multiplied with y[srcBLen - 3], y[srcBLen - 4] respectively */ |
xorjoep | 1:24714b45cd1b | 223 | sum = __SMLADX(*__SIMD32(px)++, *__SIMD32(py)--, sum); |
xorjoep | 1:24714b45cd1b | 224 | |
xorjoep | 1:24714b45cd1b | 225 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 226 | k--; |
xorjoep | 1:24714b45cd1b | 227 | } |
xorjoep | 1:24714b45cd1b | 228 | |
xorjoep | 1:24714b45cd1b | 229 | /* For the next MAC operations, the pointer py is used without SIMD |
xorjoep | 1:24714b45cd1b | 230 | * So, py is incremented by 1 */ |
xorjoep | 1:24714b45cd1b | 231 | py = py + 1U; |
xorjoep | 1:24714b45cd1b | 232 | |
xorjoep | 1:24714b45cd1b | 233 | /* If the count is not a multiple of 4, compute any remaining MACs here. |
xorjoep | 1:24714b45cd1b | 234 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 235 | k = count % 0x4U; |
xorjoep | 1:24714b45cd1b | 236 | |
xorjoep | 1:24714b45cd1b | 237 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 238 | { |
xorjoep | 1:24714b45cd1b | 239 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 240 | sum = __SMLAD(*px++, *py--, sum); |
xorjoep | 1:24714b45cd1b | 241 | |
xorjoep | 1:24714b45cd1b | 242 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 243 | k--; |
xorjoep | 1:24714b45cd1b | 244 | } |
xorjoep | 1:24714b45cd1b | 245 | |
xorjoep | 1:24714b45cd1b | 246 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 247 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 248 | |
xorjoep | 1:24714b45cd1b | 249 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 250 | py = ++pSrc2 - 1U; |
xorjoep | 1:24714b45cd1b | 251 | px = pIn1; |
xorjoep | 1:24714b45cd1b | 252 | |
xorjoep | 1:24714b45cd1b | 253 | /* Increment the MAC count */ |
xorjoep | 1:24714b45cd1b | 254 | count++; |
xorjoep | 1:24714b45cd1b | 255 | |
xorjoep | 1:24714b45cd1b | 256 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 257 | blockSize1--; |
xorjoep | 1:24714b45cd1b | 258 | } |
xorjoep | 1:24714b45cd1b | 259 | |
xorjoep | 1:24714b45cd1b | 260 | /* -------------------------- |
xorjoep | 1:24714b45cd1b | 261 | * Initializations of stage2 |
xorjoep | 1:24714b45cd1b | 262 | * ------------------------*/ |
xorjoep | 1:24714b45cd1b | 263 | |
xorjoep | 1:24714b45cd1b | 264 | /* sum = x[0] * y[srcBLen-1] + x[1] * y[srcBLen-2] +...+ x[srcBLen-1] * y[0] |
xorjoep | 1:24714b45cd1b | 265 | * sum = x[1] * y[srcBLen-1] + x[2] * y[srcBLen-2] +...+ x[srcBLen] * y[0] |
xorjoep | 1:24714b45cd1b | 266 | * .... |
xorjoep | 1:24714b45cd1b | 267 | * sum = x[srcALen-srcBLen-2] * y[srcBLen-1] + x[srcALen] * y[srcBLen-2] +...+ x[srcALen-1] * y[0] |
xorjoep | 1:24714b45cd1b | 268 | */ |
xorjoep | 1:24714b45cd1b | 269 | |
xorjoep | 1:24714b45cd1b | 270 | /* Working pointer of inputA */ |
xorjoep | 1:24714b45cd1b | 271 | if ((int32_t)firstIndex - (int32_t)srcBLen + 1 > 0) |
xorjoep | 1:24714b45cd1b | 272 | { |
xorjoep | 1:24714b45cd1b | 273 | px = pIn1 + firstIndex - srcBLen + 1; |
xorjoep | 1:24714b45cd1b | 274 | } |
xorjoep | 1:24714b45cd1b | 275 | else |
xorjoep | 1:24714b45cd1b | 276 | { |
xorjoep | 1:24714b45cd1b | 277 | px = pIn1; |
xorjoep | 1:24714b45cd1b | 278 | } |
xorjoep | 1:24714b45cd1b | 279 | |
xorjoep | 1:24714b45cd1b | 280 | /* Working pointer of inputB */ |
xorjoep | 1:24714b45cd1b | 281 | pSrc2 = pIn2 + (srcBLen - 1U); |
xorjoep | 1:24714b45cd1b | 282 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 283 | |
xorjoep | 1:24714b45cd1b | 284 | /* count is the index by which the pointer pIn1 to be incremented */ |
xorjoep | 1:24714b45cd1b | 285 | count = 0U; |
xorjoep | 1:24714b45cd1b | 286 | |
xorjoep | 1:24714b45cd1b | 287 | |
xorjoep | 1:24714b45cd1b | 288 | /* -------------------- |
xorjoep | 1:24714b45cd1b | 289 | * Stage2 process |
xorjoep | 1:24714b45cd1b | 290 | * -------------------*/ |
xorjoep | 1:24714b45cd1b | 291 | |
xorjoep | 1:24714b45cd1b | 292 | /* Stage2 depends on srcBLen as in this stage srcBLen number of MACS are performed. |
xorjoep | 1:24714b45cd1b | 293 | * So, to loop unroll over blockSize2, |
xorjoep | 1:24714b45cd1b | 294 | * srcBLen should be greater than or equal to 4 */ |
xorjoep | 1:24714b45cd1b | 295 | if (srcBLen >= 4U) |
xorjoep | 1:24714b45cd1b | 296 | { |
xorjoep | 1:24714b45cd1b | 297 | /* Loop unroll over blockSize2, by 4 */ |
xorjoep | 1:24714b45cd1b | 298 | blkCnt = ((uint32_t) blockSize2 >> 2U); |
xorjoep | 1:24714b45cd1b | 299 | |
xorjoep | 1:24714b45cd1b | 300 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 301 | { |
xorjoep | 1:24714b45cd1b | 302 | py = py - 1U; |
xorjoep | 1:24714b45cd1b | 303 | |
xorjoep | 1:24714b45cd1b | 304 | /* Set all accumulators to zero */ |
xorjoep | 1:24714b45cd1b | 305 | acc0 = 0; |
xorjoep | 1:24714b45cd1b | 306 | acc1 = 0; |
xorjoep | 1:24714b45cd1b | 307 | acc2 = 0; |
xorjoep | 1:24714b45cd1b | 308 | acc3 = 0; |
xorjoep | 1:24714b45cd1b | 309 | |
xorjoep | 1:24714b45cd1b | 310 | |
xorjoep | 1:24714b45cd1b | 311 | /* read x[0], x[1] samples */ |
xorjoep | 1:24714b45cd1b | 312 | x0 = *__SIMD32(px); |
xorjoep | 1:24714b45cd1b | 313 | /* read x[1], x[2] samples */ |
xorjoep | 1:24714b45cd1b | 314 | x1 = _SIMD32_OFFSET(px+1); |
xorjoep | 1:24714b45cd1b | 315 | px+= 2U; |
xorjoep | 1:24714b45cd1b | 316 | |
xorjoep | 1:24714b45cd1b | 317 | |
xorjoep | 1:24714b45cd1b | 318 | /* Apply loop unrolling and compute 4 MACs simultaneously. */ |
xorjoep | 1:24714b45cd1b | 319 | k = srcBLen >> 2U; |
xorjoep | 1:24714b45cd1b | 320 | |
xorjoep | 1:24714b45cd1b | 321 | /* First part of the processing with loop unrolling. Compute 4 MACs at a time. |
xorjoep | 1:24714b45cd1b | 322 | ** a second loop below computes MACs for the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 323 | do |
xorjoep | 1:24714b45cd1b | 324 | { |
xorjoep | 1:24714b45cd1b | 325 | /* Read the last two inputB samples using SIMD: |
xorjoep | 1:24714b45cd1b | 326 | * y[srcBLen - 1] and y[srcBLen - 2] */ |
xorjoep | 1:24714b45cd1b | 327 | c0 = *__SIMD32(py)--; |
xorjoep | 1:24714b45cd1b | 328 | |
xorjoep | 1:24714b45cd1b | 329 | /* acc0 += x[0] * y[srcBLen - 1] + x[1] * y[srcBLen - 2] */ |
xorjoep | 1:24714b45cd1b | 330 | acc0 = __SMLADX(x0, c0, acc0); |
xorjoep | 1:24714b45cd1b | 331 | |
xorjoep | 1:24714b45cd1b | 332 | /* acc1 += x[1] * y[srcBLen - 1] + x[2] * y[srcBLen - 2] */ |
xorjoep | 1:24714b45cd1b | 333 | acc1 = __SMLADX(x1, c0, acc1); |
xorjoep | 1:24714b45cd1b | 334 | |
xorjoep | 1:24714b45cd1b | 335 | /* Read x[2], x[3] */ |
xorjoep | 1:24714b45cd1b | 336 | x2 = *__SIMD32(px); |
xorjoep | 1:24714b45cd1b | 337 | |
xorjoep | 1:24714b45cd1b | 338 | /* Read x[3], x[4] */ |
xorjoep | 1:24714b45cd1b | 339 | x3 = _SIMD32_OFFSET(px+1); |
xorjoep | 1:24714b45cd1b | 340 | |
xorjoep | 1:24714b45cd1b | 341 | /* acc2 += x[2] * y[srcBLen - 1] + x[3] * y[srcBLen - 2] */ |
xorjoep | 1:24714b45cd1b | 342 | acc2 = __SMLADX(x2, c0, acc2); |
xorjoep | 1:24714b45cd1b | 343 | |
xorjoep | 1:24714b45cd1b | 344 | /* acc3 += x[3] * y[srcBLen - 1] + x[4] * y[srcBLen - 2] */ |
xorjoep | 1:24714b45cd1b | 345 | acc3 = __SMLADX(x3, c0, acc3); |
xorjoep | 1:24714b45cd1b | 346 | |
xorjoep | 1:24714b45cd1b | 347 | /* Read y[srcBLen - 3] and y[srcBLen - 4] */ |
xorjoep | 1:24714b45cd1b | 348 | c0 = *__SIMD32(py)--; |
xorjoep | 1:24714b45cd1b | 349 | |
xorjoep | 1:24714b45cd1b | 350 | /* acc0 += x[2] * y[srcBLen - 3] + x[3] * y[srcBLen - 4] */ |
xorjoep | 1:24714b45cd1b | 351 | acc0 = __SMLADX(x2, c0, acc0); |
xorjoep | 1:24714b45cd1b | 352 | |
xorjoep | 1:24714b45cd1b | 353 | /* acc1 += x[3] * y[srcBLen - 3] + x[4] * y[srcBLen - 4] */ |
xorjoep | 1:24714b45cd1b | 354 | acc1 = __SMLADX(x3, c0, acc1); |
xorjoep | 1:24714b45cd1b | 355 | |
xorjoep | 1:24714b45cd1b | 356 | /* Read x[4], x[5] */ |
xorjoep | 1:24714b45cd1b | 357 | x0 = _SIMD32_OFFSET(px+2); |
xorjoep | 1:24714b45cd1b | 358 | |
xorjoep | 1:24714b45cd1b | 359 | /* Read x[5], x[6] */ |
xorjoep | 1:24714b45cd1b | 360 | x1 = _SIMD32_OFFSET(px+3); |
xorjoep | 1:24714b45cd1b | 361 | px += 4U; |
xorjoep | 1:24714b45cd1b | 362 | |
xorjoep | 1:24714b45cd1b | 363 | /* acc2 += x[4] * y[srcBLen - 3] + x[5] * y[srcBLen - 4] */ |
xorjoep | 1:24714b45cd1b | 364 | acc2 = __SMLADX(x0, c0, acc2); |
xorjoep | 1:24714b45cd1b | 365 | |
xorjoep | 1:24714b45cd1b | 366 | /* acc3 += x[5] * y[srcBLen - 3] + x[6] * y[srcBLen - 4] */ |
xorjoep | 1:24714b45cd1b | 367 | acc3 = __SMLADX(x1, c0, acc3); |
xorjoep | 1:24714b45cd1b | 368 | |
xorjoep | 1:24714b45cd1b | 369 | } while (--k); |
xorjoep | 1:24714b45cd1b | 370 | |
xorjoep | 1:24714b45cd1b | 371 | /* For the next MAC operations, SIMD is not used |
xorjoep | 1:24714b45cd1b | 372 | * So, the 16 bit pointer if inputB, py is updated */ |
xorjoep | 1:24714b45cd1b | 373 | |
xorjoep | 1:24714b45cd1b | 374 | /* If the srcBLen is not a multiple of 4, compute any remaining MACs here. |
xorjoep | 1:24714b45cd1b | 375 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 376 | k = srcBLen % 0x4U; |
xorjoep | 1:24714b45cd1b | 377 | |
xorjoep | 1:24714b45cd1b | 378 | if (k == 1U) |
xorjoep | 1:24714b45cd1b | 379 | { |
xorjoep | 1:24714b45cd1b | 380 | /* Read y[srcBLen - 5] */ |
xorjoep | 1:24714b45cd1b | 381 | c0 = *(py+1); |
xorjoep | 1:24714b45cd1b | 382 | #ifdef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 383 | |
xorjoep | 1:24714b45cd1b | 384 | c0 = c0 << 16U; |
xorjoep | 1:24714b45cd1b | 385 | |
xorjoep | 1:24714b45cd1b | 386 | #else |
xorjoep | 1:24714b45cd1b | 387 | |
xorjoep | 1:24714b45cd1b | 388 | c0 = c0 & 0x0000FFFF; |
xorjoep | 1:24714b45cd1b | 389 | |
xorjoep | 1:24714b45cd1b | 390 | #endif /* #ifdef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 391 | |
xorjoep | 1:24714b45cd1b | 392 | /* Read x[7] */ |
xorjoep | 1:24714b45cd1b | 393 | x3 = *__SIMD32(px); |
xorjoep | 1:24714b45cd1b | 394 | px++; |
xorjoep | 1:24714b45cd1b | 395 | |
xorjoep | 1:24714b45cd1b | 396 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 397 | acc0 = __SMLAD(x0, c0, acc0); |
xorjoep | 1:24714b45cd1b | 398 | acc1 = __SMLAD(x1, c0, acc1); |
xorjoep | 1:24714b45cd1b | 399 | acc2 = __SMLADX(x1, c0, acc2); |
xorjoep | 1:24714b45cd1b | 400 | acc3 = __SMLADX(x3, c0, acc3); |
xorjoep | 1:24714b45cd1b | 401 | } |
xorjoep | 1:24714b45cd1b | 402 | |
xorjoep | 1:24714b45cd1b | 403 | if (k == 2U) |
xorjoep | 1:24714b45cd1b | 404 | { |
xorjoep | 1:24714b45cd1b | 405 | /* Read y[srcBLen - 5], y[srcBLen - 6] */ |
xorjoep | 1:24714b45cd1b | 406 | c0 = _SIMD32_OFFSET(py); |
xorjoep | 1:24714b45cd1b | 407 | |
xorjoep | 1:24714b45cd1b | 408 | /* Read x[7], x[8] */ |
xorjoep | 1:24714b45cd1b | 409 | x3 = *__SIMD32(px); |
xorjoep | 1:24714b45cd1b | 410 | |
xorjoep | 1:24714b45cd1b | 411 | /* Read x[9] */ |
xorjoep | 1:24714b45cd1b | 412 | x2 = _SIMD32_OFFSET(px+1); |
xorjoep | 1:24714b45cd1b | 413 | px += 2U; |
xorjoep | 1:24714b45cd1b | 414 | |
xorjoep | 1:24714b45cd1b | 415 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 416 | acc0 = __SMLADX(x0, c0, acc0); |
xorjoep | 1:24714b45cd1b | 417 | acc1 = __SMLADX(x1, c0, acc1); |
xorjoep | 1:24714b45cd1b | 418 | acc2 = __SMLADX(x3, c0, acc2); |
xorjoep | 1:24714b45cd1b | 419 | acc3 = __SMLADX(x2, c0, acc3); |
xorjoep | 1:24714b45cd1b | 420 | } |
xorjoep | 1:24714b45cd1b | 421 | |
xorjoep | 1:24714b45cd1b | 422 | if (k == 3U) |
xorjoep | 1:24714b45cd1b | 423 | { |
xorjoep | 1:24714b45cd1b | 424 | /* Read y[srcBLen - 5], y[srcBLen - 6] */ |
xorjoep | 1:24714b45cd1b | 425 | c0 = _SIMD32_OFFSET(py); |
xorjoep | 1:24714b45cd1b | 426 | |
xorjoep | 1:24714b45cd1b | 427 | /* Read x[7], x[8] */ |
xorjoep | 1:24714b45cd1b | 428 | x3 = *__SIMD32(px); |
xorjoep | 1:24714b45cd1b | 429 | |
xorjoep | 1:24714b45cd1b | 430 | /* Read x[9] */ |
xorjoep | 1:24714b45cd1b | 431 | x2 = _SIMD32_OFFSET(px+1); |
xorjoep | 1:24714b45cd1b | 432 | |
xorjoep | 1:24714b45cd1b | 433 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 434 | acc0 = __SMLADX(x0, c0, acc0); |
xorjoep | 1:24714b45cd1b | 435 | acc1 = __SMLADX(x1, c0, acc1); |
xorjoep | 1:24714b45cd1b | 436 | acc2 = __SMLADX(x3, c0, acc2); |
xorjoep | 1:24714b45cd1b | 437 | acc3 = __SMLADX(x2, c0, acc3); |
xorjoep | 1:24714b45cd1b | 438 | |
xorjoep | 1:24714b45cd1b | 439 | c0 = *(py-1); |
xorjoep | 1:24714b45cd1b | 440 | #ifdef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 441 | |
xorjoep | 1:24714b45cd1b | 442 | c0 = c0 << 16U; |
xorjoep | 1:24714b45cd1b | 443 | #else |
xorjoep | 1:24714b45cd1b | 444 | |
xorjoep | 1:24714b45cd1b | 445 | c0 = c0 & 0x0000FFFF; |
xorjoep | 1:24714b45cd1b | 446 | #endif /* #ifdef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 447 | |
xorjoep | 1:24714b45cd1b | 448 | /* Read x[10] */ |
xorjoep | 1:24714b45cd1b | 449 | x3 = _SIMD32_OFFSET(px+2); |
xorjoep | 1:24714b45cd1b | 450 | px += 3U; |
xorjoep | 1:24714b45cd1b | 451 | |
xorjoep | 1:24714b45cd1b | 452 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 453 | acc0 = __SMLADX(x1, c0, acc0); |
xorjoep | 1:24714b45cd1b | 454 | acc1 = __SMLAD(x2, c0, acc1); |
xorjoep | 1:24714b45cd1b | 455 | acc2 = __SMLADX(x2, c0, acc2); |
xorjoep | 1:24714b45cd1b | 456 | acc3 = __SMLADX(x3, c0, acc3); |
xorjoep | 1:24714b45cd1b | 457 | } |
xorjoep | 1:24714b45cd1b | 458 | |
xorjoep | 1:24714b45cd1b | 459 | /* Store the results in the accumulators in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 460 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 461 | |
xorjoep | 1:24714b45cd1b | 462 | *__SIMD32(pOut)++ = __PKHBT(acc0 >> 15, acc1 >> 15, 16); |
xorjoep | 1:24714b45cd1b | 463 | *__SIMD32(pOut)++ = __PKHBT(acc2 >> 15, acc3 >> 15, 16); |
xorjoep | 1:24714b45cd1b | 464 | |
xorjoep | 1:24714b45cd1b | 465 | #else |
xorjoep | 1:24714b45cd1b | 466 | |
xorjoep | 1:24714b45cd1b | 467 | *__SIMD32(pOut)++ = __PKHBT(acc1 >> 15, acc0 >> 15, 16); |
xorjoep | 1:24714b45cd1b | 468 | *__SIMD32(pOut)++ = __PKHBT(acc3 >> 15, acc2 >> 15, 16); |
xorjoep | 1:24714b45cd1b | 469 | |
xorjoep | 1:24714b45cd1b | 470 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 471 | |
xorjoep | 1:24714b45cd1b | 472 | /* Increment the pointer pIn1 index, count by 4 */ |
xorjoep | 1:24714b45cd1b | 473 | count += 4U; |
xorjoep | 1:24714b45cd1b | 474 | |
xorjoep | 1:24714b45cd1b | 475 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 476 | px = pIn1 + count; |
xorjoep | 1:24714b45cd1b | 477 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 478 | |
xorjoep | 1:24714b45cd1b | 479 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 480 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 481 | } |
xorjoep | 1:24714b45cd1b | 482 | |
xorjoep | 1:24714b45cd1b | 483 | /* If the blockSize2 is not a multiple of 4, compute any remaining output samples here. |
xorjoep | 1:24714b45cd1b | 484 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 485 | blkCnt = (uint32_t) blockSize2 % 0x4U; |
xorjoep | 1:24714b45cd1b | 486 | |
xorjoep | 1:24714b45cd1b | 487 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 488 | { |
xorjoep | 1:24714b45cd1b | 489 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 490 | sum = 0; |
xorjoep | 1:24714b45cd1b | 491 | |
xorjoep | 1:24714b45cd1b | 492 | /* Apply loop unrolling and compute 4 MACs simultaneously. */ |
xorjoep | 1:24714b45cd1b | 493 | k = srcBLen >> 2U; |
xorjoep | 1:24714b45cd1b | 494 | |
xorjoep | 1:24714b45cd1b | 495 | /* First part of the processing with loop unrolling. Compute 4 MACs at a time. |
xorjoep | 1:24714b45cd1b | 496 | ** a second loop below computes MACs for the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 497 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 498 | { |
xorjoep | 1:24714b45cd1b | 499 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 500 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 501 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 502 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 503 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 504 | |
xorjoep | 1:24714b45cd1b | 505 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 506 | k--; |
xorjoep | 1:24714b45cd1b | 507 | } |
xorjoep | 1:24714b45cd1b | 508 | |
xorjoep | 1:24714b45cd1b | 509 | /* If the srcBLen is not a multiple of 4, compute any remaining MACs here. |
xorjoep | 1:24714b45cd1b | 510 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 511 | k = srcBLen % 0x4U; |
xorjoep | 1:24714b45cd1b | 512 | |
xorjoep | 1:24714b45cd1b | 513 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 514 | { |
xorjoep | 1:24714b45cd1b | 515 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 516 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 517 | |
xorjoep | 1:24714b45cd1b | 518 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 519 | k--; |
xorjoep | 1:24714b45cd1b | 520 | } |
xorjoep | 1:24714b45cd1b | 521 | |
xorjoep | 1:24714b45cd1b | 522 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 523 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 524 | |
xorjoep | 1:24714b45cd1b | 525 | /* Increment the pointer pIn1 index, count by 1 */ |
xorjoep | 1:24714b45cd1b | 526 | count++; |
xorjoep | 1:24714b45cd1b | 527 | |
xorjoep | 1:24714b45cd1b | 528 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 529 | if ((int32_t)firstIndex - (int32_t)srcBLen + 1 > 0) |
xorjoep | 1:24714b45cd1b | 530 | { |
xorjoep | 1:24714b45cd1b | 531 | px = pIn1 + firstIndex - srcBLen + 1 + count; |
xorjoep | 1:24714b45cd1b | 532 | } |
xorjoep | 1:24714b45cd1b | 533 | else |
xorjoep | 1:24714b45cd1b | 534 | { |
xorjoep | 1:24714b45cd1b | 535 | px = pIn1 + count; |
xorjoep | 1:24714b45cd1b | 536 | } |
xorjoep | 1:24714b45cd1b | 537 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 538 | |
xorjoep | 1:24714b45cd1b | 539 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 540 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 541 | } |
xorjoep | 1:24714b45cd1b | 542 | } |
xorjoep | 1:24714b45cd1b | 543 | else |
xorjoep | 1:24714b45cd1b | 544 | { |
xorjoep | 1:24714b45cd1b | 545 | /* If the srcBLen is not a multiple of 4, |
xorjoep | 1:24714b45cd1b | 546 | * the blockSize2 loop cannot be unrolled by 4 */ |
xorjoep | 1:24714b45cd1b | 547 | blkCnt = (uint32_t) blockSize2; |
xorjoep | 1:24714b45cd1b | 548 | |
xorjoep | 1:24714b45cd1b | 549 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 550 | { |
xorjoep | 1:24714b45cd1b | 551 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 552 | sum = 0; |
xorjoep | 1:24714b45cd1b | 553 | |
xorjoep | 1:24714b45cd1b | 554 | /* srcBLen number of MACS should be performed */ |
xorjoep | 1:24714b45cd1b | 555 | k = srcBLen; |
xorjoep | 1:24714b45cd1b | 556 | |
xorjoep | 1:24714b45cd1b | 557 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 558 | { |
xorjoep | 1:24714b45cd1b | 559 | /* Perform the multiply-accumulate */ |
xorjoep | 1:24714b45cd1b | 560 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 561 | |
xorjoep | 1:24714b45cd1b | 562 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 563 | k--; |
xorjoep | 1:24714b45cd1b | 564 | } |
xorjoep | 1:24714b45cd1b | 565 | |
xorjoep | 1:24714b45cd1b | 566 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 567 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 568 | |
xorjoep | 1:24714b45cd1b | 569 | /* Increment the MAC count */ |
xorjoep | 1:24714b45cd1b | 570 | count++; |
xorjoep | 1:24714b45cd1b | 571 | |
xorjoep | 1:24714b45cd1b | 572 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 573 | if ((int32_t)firstIndex - (int32_t)srcBLen + 1 > 0) |
xorjoep | 1:24714b45cd1b | 574 | { |
xorjoep | 1:24714b45cd1b | 575 | px = pIn1 + firstIndex - srcBLen + 1 + count; |
xorjoep | 1:24714b45cd1b | 576 | } |
xorjoep | 1:24714b45cd1b | 577 | else |
xorjoep | 1:24714b45cd1b | 578 | { |
xorjoep | 1:24714b45cd1b | 579 | px = pIn1 + count; |
xorjoep | 1:24714b45cd1b | 580 | } |
xorjoep | 1:24714b45cd1b | 581 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 582 | |
xorjoep | 1:24714b45cd1b | 583 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 584 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 585 | } |
xorjoep | 1:24714b45cd1b | 586 | } |
xorjoep | 1:24714b45cd1b | 587 | |
xorjoep | 1:24714b45cd1b | 588 | |
xorjoep | 1:24714b45cd1b | 589 | /* -------------------------- |
xorjoep | 1:24714b45cd1b | 590 | * Initializations of stage3 |
xorjoep | 1:24714b45cd1b | 591 | * -------------------------*/ |
xorjoep | 1:24714b45cd1b | 592 | |
xorjoep | 1:24714b45cd1b | 593 | /* sum += x[srcALen-srcBLen+1] * y[srcBLen-1] + x[srcALen-srcBLen+2] * y[srcBLen-2] +...+ x[srcALen-1] * y[1] |
xorjoep | 1:24714b45cd1b | 594 | * sum += x[srcALen-srcBLen+2] * y[srcBLen-1] + x[srcALen-srcBLen+3] * y[srcBLen-2] +...+ x[srcALen-1] * y[2] |
xorjoep | 1:24714b45cd1b | 595 | * .... |
xorjoep | 1:24714b45cd1b | 596 | * sum += x[srcALen-2] * y[srcBLen-1] + x[srcALen-1] * y[srcBLen-2] |
xorjoep | 1:24714b45cd1b | 597 | * sum += x[srcALen-1] * y[srcBLen-1] |
xorjoep | 1:24714b45cd1b | 598 | */ |
xorjoep | 1:24714b45cd1b | 599 | |
xorjoep | 1:24714b45cd1b | 600 | /* In this stage the MAC operations are decreased by 1 for every iteration. |
xorjoep | 1:24714b45cd1b | 601 | The count variable holds the number of MAC operations performed */ |
xorjoep | 1:24714b45cd1b | 602 | count = srcBLen - 1U; |
xorjoep | 1:24714b45cd1b | 603 | |
xorjoep | 1:24714b45cd1b | 604 | /* Working pointer of inputA */ |
xorjoep | 1:24714b45cd1b | 605 | pSrc1 = (pIn1 + srcALen) - (srcBLen - 1U); |
xorjoep | 1:24714b45cd1b | 606 | px = pSrc1; |
xorjoep | 1:24714b45cd1b | 607 | |
xorjoep | 1:24714b45cd1b | 608 | /* Working pointer of inputB */ |
xorjoep | 1:24714b45cd1b | 609 | pSrc2 = pIn2 + (srcBLen - 1U); |
xorjoep | 1:24714b45cd1b | 610 | pIn2 = pSrc2 - 1U; |
xorjoep | 1:24714b45cd1b | 611 | py = pIn2; |
xorjoep | 1:24714b45cd1b | 612 | |
xorjoep | 1:24714b45cd1b | 613 | /* ------------------- |
xorjoep | 1:24714b45cd1b | 614 | * Stage3 process |
xorjoep | 1:24714b45cd1b | 615 | * ------------------*/ |
xorjoep | 1:24714b45cd1b | 616 | |
xorjoep | 1:24714b45cd1b | 617 | /* For loop unrolling by 4, this stage is divided into two. */ |
xorjoep | 1:24714b45cd1b | 618 | /* First part of this stage computes the MAC operations greater than 4 */ |
xorjoep | 1:24714b45cd1b | 619 | /* Second part of this stage computes the MAC operations less than or equal to 4 */ |
xorjoep | 1:24714b45cd1b | 620 | |
xorjoep | 1:24714b45cd1b | 621 | /* The first part of the stage starts here */ |
xorjoep | 1:24714b45cd1b | 622 | j = count >> 2U; |
xorjoep | 1:24714b45cd1b | 623 | |
xorjoep | 1:24714b45cd1b | 624 | while ((j > 0U) && (blockSize3 > 0)) |
xorjoep | 1:24714b45cd1b | 625 | { |
xorjoep | 1:24714b45cd1b | 626 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 627 | sum = 0; |
xorjoep | 1:24714b45cd1b | 628 | |
xorjoep | 1:24714b45cd1b | 629 | /* Apply loop unrolling and compute 4 MACs simultaneously. */ |
xorjoep | 1:24714b45cd1b | 630 | k = count >> 2U; |
xorjoep | 1:24714b45cd1b | 631 | |
xorjoep | 1:24714b45cd1b | 632 | /* First part of the processing with loop unrolling. Compute 4 MACs at a time. |
xorjoep | 1:24714b45cd1b | 633 | ** a second loop below computes MACs for the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 634 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 635 | { |
xorjoep | 1:24714b45cd1b | 636 | /* x[srcALen - srcBLen + 1], x[srcALen - srcBLen + 2] are multiplied |
xorjoep | 1:24714b45cd1b | 637 | * with y[srcBLen - 1], y[srcBLen - 2] respectively */ |
xorjoep | 1:24714b45cd1b | 638 | sum = __SMLADX(*__SIMD32(px)++, *__SIMD32(py)--, sum); |
xorjoep | 1:24714b45cd1b | 639 | /* x[srcALen - srcBLen + 3], x[srcALen - srcBLen + 4] are multiplied |
xorjoep | 1:24714b45cd1b | 640 | * with y[srcBLen - 3], y[srcBLen - 4] respectively */ |
xorjoep | 1:24714b45cd1b | 641 | sum = __SMLADX(*__SIMD32(px)++, *__SIMD32(py)--, sum); |
xorjoep | 1:24714b45cd1b | 642 | |
xorjoep | 1:24714b45cd1b | 643 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 644 | k--; |
xorjoep | 1:24714b45cd1b | 645 | } |
xorjoep | 1:24714b45cd1b | 646 | |
xorjoep | 1:24714b45cd1b | 647 | /* For the next MAC operations, the pointer py is used without SIMD |
xorjoep | 1:24714b45cd1b | 648 | * So, py is incremented by 1 */ |
xorjoep | 1:24714b45cd1b | 649 | py = py + 1U; |
xorjoep | 1:24714b45cd1b | 650 | |
xorjoep | 1:24714b45cd1b | 651 | /* If the count is not a multiple of 4, compute any remaining MACs here. |
xorjoep | 1:24714b45cd1b | 652 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 653 | k = count % 0x4U; |
xorjoep | 1:24714b45cd1b | 654 | |
xorjoep | 1:24714b45cd1b | 655 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 656 | { |
xorjoep | 1:24714b45cd1b | 657 | /* sum += x[srcALen - srcBLen + 5] * y[srcBLen - 5] */ |
xorjoep | 1:24714b45cd1b | 658 | sum = __SMLAD(*px++, *py--, sum); |
xorjoep | 1:24714b45cd1b | 659 | |
xorjoep | 1:24714b45cd1b | 660 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 661 | k--; |
xorjoep | 1:24714b45cd1b | 662 | } |
xorjoep | 1:24714b45cd1b | 663 | |
xorjoep | 1:24714b45cd1b | 664 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 665 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 666 | |
xorjoep | 1:24714b45cd1b | 667 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 668 | px = ++pSrc1; |
xorjoep | 1:24714b45cd1b | 669 | py = pIn2; |
xorjoep | 1:24714b45cd1b | 670 | |
xorjoep | 1:24714b45cd1b | 671 | /* Decrement the MAC count */ |
xorjoep | 1:24714b45cd1b | 672 | count--; |
xorjoep | 1:24714b45cd1b | 673 | |
xorjoep | 1:24714b45cd1b | 674 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 675 | blockSize3--; |
xorjoep | 1:24714b45cd1b | 676 | |
xorjoep | 1:24714b45cd1b | 677 | j--; |
xorjoep | 1:24714b45cd1b | 678 | } |
xorjoep | 1:24714b45cd1b | 679 | |
xorjoep | 1:24714b45cd1b | 680 | /* The second part of the stage starts here */ |
xorjoep | 1:24714b45cd1b | 681 | /* SIMD is not used for the next MAC operations, |
xorjoep | 1:24714b45cd1b | 682 | * so pointer py is updated to read only one sample at a time */ |
xorjoep | 1:24714b45cd1b | 683 | py = py + 1U; |
xorjoep | 1:24714b45cd1b | 684 | |
xorjoep | 1:24714b45cd1b | 685 | while (blockSize3 > 0) |
xorjoep | 1:24714b45cd1b | 686 | { |
xorjoep | 1:24714b45cd1b | 687 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 688 | sum = 0; |
xorjoep | 1:24714b45cd1b | 689 | |
xorjoep | 1:24714b45cd1b | 690 | /* Apply loop unrolling and compute 4 MACs simultaneously. */ |
xorjoep | 1:24714b45cd1b | 691 | k = count; |
xorjoep | 1:24714b45cd1b | 692 | |
xorjoep | 1:24714b45cd1b | 693 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 694 | { |
xorjoep | 1:24714b45cd1b | 695 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 696 | /* sum += x[srcALen-1] * y[srcBLen-1] */ |
xorjoep | 1:24714b45cd1b | 697 | sum = __SMLAD(*px++, *py--, sum); |
xorjoep | 1:24714b45cd1b | 698 | |
xorjoep | 1:24714b45cd1b | 699 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 700 | k--; |
xorjoep | 1:24714b45cd1b | 701 | } |
xorjoep | 1:24714b45cd1b | 702 | |
xorjoep | 1:24714b45cd1b | 703 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 704 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 705 | |
xorjoep | 1:24714b45cd1b | 706 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 707 | px = ++pSrc1; |
xorjoep | 1:24714b45cd1b | 708 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 709 | |
xorjoep | 1:24714b45cd1b | 710 | /* Decrement the MAC count */ |
xorjoep | 1:24714b45cd1b | 711 | count--; |
xorjoep | 1:24714b45cd1b | 712 | |
xorjoep | 1:24714b45cd1b | 713 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 714 | blockSize3--; |
xorjoep | 1:24714b45cd1b | 715 | } |
xorjoep | 1:24714b45cd1b | 716 | |
xorjoep | 1:24714b45cd1b | 717 | /* set status as ARM_MATH_SUCCESS */ |
xorjoep | 1:24714b45cd1b | 718 | status = ARM_MATH_SUCCESS; |
xorjoep | 1:24714b45cd1b | 719 | } |
xorjoep | 1:24714b45cd1b | 720 | |
xorjoep | 1:24714b45cd1b | 721 | /* Return to application */ |
xorjoep | 1:24714b45cd1b | 722 | return (status); |
xorjoep | 1:24714b45cd1b | 723 | |
xorjoep | 1:24714b45cd1b | 724 | #else |
xorjoep | 1:24714b45cd1b | 725 | |
xorjoep | 1:24714b45cd1b | 726 | q15_t *pIn1; /* inputA pointer */ |
xorjoep | 1:24714b45cd1b | 727 | q15_t *pIn2; /* inputB pointer */ |
xorjoep | 1:24714b45cd1b | 728 | q15_t *pOut = pDst; /* output pointer */ |
xorjoep | 1:24714b45cd1b | 729 | q31_t sum, acc0, acc1, acc2, acc3; /* Accumulator */ |
xorjoep | 1:24714b45cd1b | 730 | q15_t *px; /* Intermediate inputA pointer */ |
xorjoep | 1:24714b45cd1b | 731 | q15_t *py; /* Intermediate inputB pointer */ |
xorjoep | 1:24714b45cd1b | 732 | q15_t *pSrc1, *pSrc2; /* Intermediate pointers */ |
xorjoep | 1:24714b45cd1b | 733 | q31_t x0, x1, x2, x3, c0; |
xorjoep | 1:24714b45cd1b | 734 | uint32_t j, k, count, check, blkCnt; |
xorjoep | 1:24714b45cd1b | 735 | int32_t blockSize1, blockSize2, blockSize3; /* loop counters */ |
xorjoep | 1:24714b45cd1b | 736 | arm_status status; /* status of Partial convolution */ |
xorjoep | 1:24714b45cd1b | 737 | q15_t a, b; |
xorjoep | 1:24714b45cd1b | 738 | |
xorjoep | 1:24714b45cd1b | 739 | /* Check for range of output samples to be calculated */ |
xorjoep | 1:24714b45cd1b | 740 | if ((firstIndex + numPoints) > ((srcALen + (srcBLen - 1U)))) |
xorjoep | 1:24714b45cd1b | 741 | { |
xorjoep | 1:24714b45cd1b | 742 | /* Set status as ARM_MATH_ARGUMENT_ERROR */ |
xorjoep | 1:24714b45cd1b | 743 | status = ARM_MATH_ARGUMENT_ERROR; |
xorjoep | 1:24714b45cd1b | 744 | } |
xorjoep | 1:24714b45cd1b | 745 | else |
xorjoep | 1:24714b45cd1b | 746 | { |
xorjoep | 1:24714b45cd1b | 747 | |
xorjoep | 1:24714b45cd1b | 748 | /* The algorithm implementation is based on the lengths of the inputs. */ |
xorjoep | 1:24714b45cd1b | 749 | /* srcB is always made to slide across srcA. */ |
xorjoep | 1:24714b45cd1b | 750 | /* So srcBLen is always considered as shorter or equal to srcALen */ |
xorjoep | 1:24714b45cd1b | 751 | if (srcALen >=srcBLen) |
xorjoep | 1:24714b45cd1b | 752 | { |
xorjoep | 1:24714b45cd1b | 753 | /* Initialization of inputA pointer */ |
xorjoep | 1:24714b45cd1b | 754 | pIn1 = pSrcA; |
xorjoep | 1:24714b45cd1b | 755 | |
xorjoep | 1:24714b45cd1b | 756 | /* Initialization of inputB pointer */ |
xorjoep | 1:24714b45cd1b | 757 | pIn2 = pSrcB; |
xorjoep | 1:24714b45cd1b | 758 | } |
xorjoep | 1:24714b45cd1b | 759 | else |
xorjoep | 1:24714b45cd1b | 760 | { |
xorjoep | 1:24714b45cd1b | 761 | /* Initialization of inputA pointer */ |
xorjoep | 1:24714b45cd1b | 762 | pIn1 = pSrcB; |
xorjoep | 1:24714b45cd1b | 763 | |
xorjoep | 1:24714b45cd1b | 764 | /* Initialization of inputB pointer */ |
xorjoep | 1:24714b45cd1b | 765 | pIn2 = pSrcA; |
xorjoep | 1:24714b45cd1b | 766 | |
xorjoep | 1:24714b45cd1b | 767 | /* srcBLen is always considered as shorter or equal to srcALen */ |
xorjoep | 1:24714b45cd1b | 768 | j = srcBLen; |
xorjoep | 1:24714b45cd1b | 769 | srcBLen = srcALen; |
xorjoep | 1:24714b45cd1b | 770 | srcALen = j; |
xorjoep | 1:24714b45cd1b | 771 | } |
xorjoep | 1:24714b45cd1b | 772 | |
xorjoep | 1:24714b45cd1b | 773 | /* Conditions to check which loopCounter holds |
xorjoep | 1:24714b45cd1b | 774 | * the first and last indices of the output samples to be calculated. */ |
xorjoep | 1:24714b45cd1b | 775 | check = firstIndex + numPoints; |
xorjoep | 1:24714b45cd1b | 776 | blockSize3 = ((int32_t)check > (int32_t)srcALen) ? (int32_t)check - (int32_t)srcALen : 0; |
xorjoep | 1:24714b45cd1b | 777 | blockSize3 = ((int32_t)firstIndex > (int32_t)srcALen - 1) ? blockSize3 - (int32_t)firstIndex + (int32_t)srcALen : blockSize3; |
xorjoep | 1:24714b45cd1b | 778 | blockSize1 = ((int32_t) srcBLen - 1) - (int32_t) firstIndex; |
xorjoep | 1:24714b45cd1b | 779 | blockSize1 = (blockSize1 > 0) ? ((check > (srcBLen - 1U)) ? blockSize1 : |
xorjoep | 1:24714b45cd1b | 780 | (int32_t) numPoints) : 0; |
xorjoep | 1:24714b45cd1b | 781 | blockSize2 = ((int32_t) check - blockSize3) - |
xorjoep | 1:24714b45cd1b | 782 | (blockSize1 + (int32_t) firstIndex); |
xorjoep | 1:24714b45cd1b | 783 | blockSize2 = (blockSize2 > 0) ? blockSize2 : 0; |
xorjoep | 1:24714b45cd1b | 784 | |
xorjoep | 1:24714b45cd1b | 785 | /* conv(x,y) at n = x[n] * y[0] + x[n-1] * y[1] + x[n-2] * y[2] + ...+ x[n-N+1] * y[N -1] */ |
xorjoep | 1:24714b45cd1b | 786 | /* The function is internally |
xorjoep | 1:24714b45cd1b | 787 | * divided into three stages according to the number of multiplications that has to be |
xorjoep | 1:24714b45cd1b | 788 | * taken place between inputA samples and inputB samples. In the first stage of the |
xorjoep | 1:24714b45cd1b | 789 | * algorithm, the multiplications increase by one for every iteration. |
xorjoep | 1:24714b45cd1b | 790 | * In the second stage of the algorithm, srcBLen number of multiplications are done. |
xorjoep | 1:24714b45cd1b | 791 | * In the third stage of the algorithm, the multiplications decrease by one |
xorjoep | 1:24714b45cd1b | 792 | * for every iteration. */ |
xorjoep | 1:24714b45cd1b | 793 | |
xorjoep | 1:24714b45cd1b | 794 | /* Set the output pointer to point to the firstIndex |
xorjoep | 1:24714b45cd1b | 795 | * of the output sample to be calculated. */ |
xorjoep | 1:24714b45cd1b | 796 | pOut = pDst + firstIndex; |
xorjoep | 1:24714b45cd1b | 797 | |
xorjoep | 1:24714b45cd1b | 798 | /* -------------------------- |
xorjoep | 1:24714b45cd1b | 799 | * Initializations of stage1 |
xorjoep | 1:24714b45cd1b | 800 | * -------------------------*/ |
xorjoep | 1:24714b45cd1b | 801 | |
xorjoep | 1:24714b45cd1b | 802 | /* sum = x[0] * y[0] |
xorjoep | 1:24714b45cd1b | 803 | * sum = x[0] * y[1] + x[1] * y[0] |
xorjoep | 1:24714b45cd1b | 804 | * .... |
xorjoep | 1:24714b45cd1b | 805 | * sum = x[0] * y[srcBlen - 1] + x[1] * y[srcBlen - 2] +...+ x[srcBLen - 1] * y[0] |
xorjoep | 1:24714b45cd1b | 806 | */ |
xorjoep | 1:24714b45cd1b | 807 | |
xorjoep | 1:24714b45cd1b | 808 | /* In this stage the MAC operations are increased by 1 for every iteration. |
xorjoep | 1:24714b45cd1b | 809 | The count variable holds the number of MAC operations performed. |
xorjoep | 1:24714b45cd1b | 810 | Since the partial convolution starts from firstIndex |
xorjoep | 1:24714b45cd1b | 811 | Number of Macs to be performed is firstIndex + 1 */ |
xorjoep | 1:24714b45cd1b | 812 | count = 1U + firstIndex; |
xorjoep | 1:24714b45cd1b | 813 | |
xorjoep | 1:24714b45cd1b | 814 | /* Working pointer of inputA */ |
xorjoep | 1:24714b45cd1b | 815 | px = pIn1; |
xorjoep | 1:24714b45cd1b | 816 | |
xorjoep | 1:24714b45cd1b | 817 | /* Working pointer of inputB */ |
xorjoep | 1:24714b45cd1b | 818 | pSrc2 = pIn2 + firstIndex; |
xorjoep | 1:24714b45cd1b | 819 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 820 | |
xorjoep | 1:24714b45cd1b | 821 | /* ------------------------ |
xorjoep | 1:24714b45cd1b | 822 | * Stage1 process |
xorjoep | 1:24714b45cd1b | 823 | * ----------------------*/ |
xorjoep | 1:24714b45cd1b | 824 | |
xorjoep | 1:24714b45cd1b | 825 | /* For loop unrolling by 4, this stage is divided into two. */ |
xorjoep | 1:24714b45cd1b | 826 | /* First part of this stage computes the MAC operations less than 4 */ |
xorjoep | 1:24714b45cd1b | 827 | /* Second part of this stage computes the MAC operations greater than or equal to 4 */ |
xorjoep | 1:24714b45cd1b | 828 | |
xorjoep | 1:24714b45cd1b | 829 | /* The first part of the stage starts here */ |
xorjoep | 1:24714b45cd1b | 830 | while ((count < 4U) && (blockSize1 > 0)) |
xorjoep | 1:24714b45cd1b | 831 | { |
xorjoep | 1:24714b45cd1b | 832 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 833 | sum = 0; |
xorjoep | 1:24714b45cd1b | 834 | |
xorjoep | 1:24714b45cd1b | 835 | /* Loop over number of MAC operations between |
xorjoep | 1:24714b45cd1b | 836 | * inputA samples and inputB samples */ |
xorjoep | 1:24714b45cd1b | 837 | k = count; |
xorjoep | 1:24714b45cd1b | 838 | |
xorjoep | 1:24714b45cd1b | 839 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 840 | { |
xorjoep | 1:24714b45cd1b | 841 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 842 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 843 | |
xorjoep | 1:24714b45cd1b | 844 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 845 | k--; |
xorjoep | 1:24714b45cd1b | 846 | } |
xorjoep | 1:24714b45cd1b | 847 | |
xorjoep | 1:24714b45cd1b | 848 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 849 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 850 | |
xorjoep | 1:24714b45cd1b | 851 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 852 | py = ++pSrc2; |
xorjoep | 1:24714b45cd1b | 853 | px = pIn1; |
xorjoep | 1:24714b45cd1b | 854 | |
xorjoep | 1:24714b45cd1b | 855 | /* Increment the MAC count */ |
xorjoep | 1:24714b45cd1b | 856 | count++; |
xorjoep | 1:24714b45cd1b | 857 | |
xorjoep | 1:24714b45cd1b | 858 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 859 | blockSize1--; |
xorjoep | 1:24714b45cd1b | 860 | } |
xorjoep | 1:24714b45cd1b | 861 | |
xorjoep | 1:24714b45cd1b | 862 | /* The second part of the stage starts here */ |
xorjoep | 1:24714b45cd1b | 863 | /* The internal loop, over count, is unrolled by 4 */ |
xorjoep | 1:24714b45cd1b | 864 | /* To, read the last two inputB samples using SIMD: |
xorjoep | 1:24714b45cd1b | 865 | * y[srcBLen] and y[srcBLen-1] coefficients, py is decremented by 1 */ |
xorjoep | 1:24714b45cd1b | 866 | py = py - 1; |
xorjoep | 1:24714b45cd1b | 867 | |
xorjoep | 1:24714b45cd1b | 868 | while (blockSize1 > 0) |
xorjoep | 1:24714b45cd1b | 869 | { |
xorjoep | 1:24714b45cd1b | 870 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 871 | sum = 0; |
xorjoep | 1:24714b45cd1b | 872 | |
xorjoep | 1:24714b45cd1b | 873 | /* Apply loop unrolling and compute 4 MACs simultaneously. */ |
xorjoep | 1:24714b45cd1b | 874 | k = count >> 2U; |
xorjoep | 1:24714b45cd1b | 875 | |
xorjoep | 1:24714b45cd1b | 876 | /* First part of the processing with loop unrolling. Compute 4 MACs at a time. |
xorjoep | 1:24714b45cd1b | 877 | ** a second loop below computes MACs for the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 878 | py++; |
xorjoep | 1:24714b45cd1b | 879 | |
xorjoep | 1:24714b45cd1b | 880 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 881 | { |
xorjoep | 1:24714b45cd1b | 882 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 883 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 884 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 885 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 886 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 887 | |
xorjoep | 1:24714b45cd1b | 888 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 889 | k--; |
xorjoep | 1:24714b45cd1b | 890 | } |
xorjoep | 1:24714b45cd1b | 891 | |
xorjoep | 1:24714b45cd1b | 892 | /* If the count is not a multiple of 4, compute any remaining MACs here. |
xorjoep | 1:24714b45cd1b | 893 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 894 | k = count % 0x4U; |
xorjoep | 1:24714b45cd1b | 895 | |
xorjoep | 1:24714b45cd1b | 896 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 897 | { |
xorjoep | 1:24714b45cd1b | 898 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 899 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 900 | |
xorjoep | 1:24714b45cd1b | 901 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 902 | k--; |
xorjoep | 1:24714b45cd1b | 903 | } |
xorjoep | 1:24714b45cd1b | 904 | |
xorjoep | 1:24714b45cd1b | 905 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 906 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 907 | |
xorjoep | 1:24714b45cd1b | 908 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 909 | py = ++pSrc2 - 1U; |
xorjoep | 1:24714b45cd1b | 910 | px = pIn1; |
xorjoep | 1:24714b45cd1b | 911 | |
xorjoep | 1:24714b45cd1b | 912 | /* Increment the MAC count */ |
xorjoep | 1:24714b45cd1b | 913 | count++; |
xorjoep | 1:24714b45cd1b | 914 | |
xorjoep | 1:24714b45cd1b | 915 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 916 | blockSize1--; |
xorjoep | 1:24714b45cd1b | 917 | } |
xorjoep | 1:24714b45cd1b | 918 | |
xorjoep | 1:24714b45cd1b | 919 | /* -------------------------- |
xorjoep | 1:24714b45cd1b | 920 | * Initializations of stage2 |
xorjoep | 1:24714b45cd1b | 921 | * ------------------------*/ |
xorjoep | 1:24714b45cd1b | 922 | |
xorjoep | 1:24714b45cd1b | 923 | /* sum = x[0] * y[srcBLen-1] + x[1] * y[srcBLen-2] +...+ x[srcBLen-1] * y[0] |
xorjoep | 1:24714b45cd1b | 924 | * sum = x[1] * y[srcBLen-1] + x[2] * y[srcBLen-2] +...+ x[srcBLen] * y[0] |
xorjoep | 1:24714b45cd1b | 925 | * .... |
xorjoep | 1:24714b45cd1b | 926 | * sum = x[srcALen-srcBLen-2] * y[srcBLen-1] + x[srcALen] * y[srcBLen-2] +...+ x[srcALen-1] * y[0] |
xorjoep | 1:24714b45cd1b | 927 | */ |
xorjoep | 1:24714b45cd1b | 928 | |
xorjoep | 1:24714b45cd1b | 929 | /* Working pointer of inputA */ |
xorjoep | 1:24714b45cd1b | 930 | if ((int32_t)firstIndex - (int32_t)srcBLen + 1 > 0) |
xorjoep | 1:24714b45cd1b | 931 | { |
xorjoep | 1:24714b45cd1b | 932 | px = pIn1 + firstIndex - srcBLen + 1; |
xorjoep | 1:24714b45cd1b | 933 | } |
xorjoep | 1:24714b45cd1b | 934 | else |
xorjoep | 1:24714b45cd1b | 935 | { |
xorjoep | 1:24714b45cd1b | 936 | px = pIn1; |
xorjoep | 1:24714b45cd1b | 937 | } |
xorjoep | 1:24714b45cd1b | 938 | |
xorjoep | 1:24714b45cd1b | 939 | /* Working pointer of inputB */ |
xorjoep | 1:24714b45cd1b | 940 | pSrc2 = pIn2 + (srcBLen - 1U); |
xorjoep | 1:24714b45cd1b | 941 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 942 | |
xorjoep | 1:24714b45cd1b | 943 | /* count is the index by which the pointer pIn1 to be incremented */ |
xorjoep | 1:24714b45cd1b | 944 | count = 0U; |
xorjoep | 1:24714b45cd1b | 945 | |
xorjoep | 1:24714b45cd1b | 946 | |
xorjoep | 1:24714b45cd1b | 947 | /* -------------------- |
xorjoep | 1:24714b45cd1b | 948 | * Stage2 process |
xorjoep | 1:24714b45cd1b | 949 | * -------------------*/ |
xorjoep | 1:24714b45cd1b | 950 | |
xorjoep | 1:24714b45cd1b | 951 | /* Stage2 depends on srcBLen as in this stage srcBLen number of MACS are performed. |
xorjoep | 1:24714b45cd1b | 952 | * So, to loop unroll over blockSize2, |
xorjoep | 1:24714b45cd1b | 953 | * srcBLen should be greater than or equal to 4 */ |
xorjoep | 1:24714b45cd1b | 954 | if (srcBLen >= 4U) |
xorjoep | 1:24714b45cd1b | 955 | { |
xorjoep | 1:24714b45cd1b | 956 | /* Loop unroll over blockSize2, by 4 */ |
xorjoep | 1:24714b45cd1b | 957 | blkCnt = ((uint32_t) blockSize2 >> 2U); |
xorjoep | 1:24714b45cd1b | 958 | |
xorjoep | 1:24714b45cd1b | 959 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 960 | { |
xorjoep | 1:24714b45cd1b | 961 | py = py - 1U; |
xorjoep | 1:24714b45cd1b | 962 | |
xorjoep | 1:24714b45cd1b | 963 | /* Set all accumulators to zero */ |
xorjoep | 1:24714b45cd1b | 964 | acc0 = 0; |
xorjoep | 1:24714b45cd1b | 965 | acc1 = 0; |
xorjoep | 1:24714b45cd1b | 966 | acc2 = 0; |
xorjoep | 1:24714b45cd1b | 967 | acc3 = 0; |
xorjoep | 1:24714b45cd1b | 968 | |
xorjoep | 1:24714b45cd1b | 969 | /* read x[0], x[1] samples */ |
xorjoep | 1:24714b45cd1b | 970 | a = *px++; |
xorjoep | 1:24714b45cd1b | 971 | b = *px++; |
xorjoep | 1:24714b45cd1b | 972 | |
xorjoep | 1:24714b45cd1b | 973 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 974 | |
xorjoep | 1:24714b45cd1b | 975 | x0 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 976 | a = *px; |
xorjoep | 1:24714b45cd1b | 977 | x1 = __PKHBT(b, a, 16); |
xorjoep | 1:24714b45cd1b | 978 | |
xorjoep | 1:24714b45cd1b | 979 | #else |
xorjoep | 1:24714b45cd1b | 980 | |
xorjoep | 1:24714b45cd1b | 981 | x0 = __PKHBT(b, a, 16); |
xorjoep | 1:24714b45cd1b | 982 | a = *px; |
xorjoep | 1:24714b45cd1b | 983 | x1 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 984 | |
xorjoep | 1:24714b45cd1b | 985 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 986 | |
xorjoep | 1:24714b45cd1b | 987 | /* Apply loop unrolling and compute 4 MACs simultaneously. */ |
xorjoep | 1:24714b45cd1b | 988 | k = srcBLen >> 2U; |
xorjoep | 1:24714b45cd1b | 989 | |
xorjoep | 1:24714b45cd1b | 990 | /* First part of the processing with loop unrolling. Compute 4 MACs at a time. |
xorjoep | 1:24714b45cd1b | 991 | ** a second loop below computes MACs for the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 992 | do |
xorjoep | 1:24714b45cd1b | 993 | { |
xorjoep | 1:24714b45cd1b | 994 | /* Read the last two inputB samples using SIMD: |
xorjoep | 1:24714b45cd1b | 995 | * y[srcBLen - 1] and y[srcBLen - 2] */ |
xorjoep | 1:24714b45cd1b | 996 | a = *py; |
xorjoep | 1:24714b45cd1b | 997 | b = *(py+1); |
xorjoep | 1:24714b45cd1b | 998 | py -= 2; |
xorjoep | 1:24714b45cd1b | 999 | |
xorjoep | 1:24714b45cd1b | 1000 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1001 | |
xorjoep | 1:24714b45cd1b | 1002 | c0 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1003 | |
xorjoep | 1:24714b45cd1b | 1004 | #else |
xorjoep | 1:24714b45cd1b | 1005 | |
xorjoep | 1:24714b45cd1b | 1006 | c0 = __PKHBT(b, a, 16);; |
xorjoep | 1:24714b45cd1b | 1007 | |
xorjoep | 1:24714b45cd1b | 1008 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1009 | |
xorjoep | 1:24714b45cd1b | 1010 | /* acc0 += x[0] * y[srcBLen - 1] + x[1] * y[srcBLen - 2] */ |
xorjoep | 1:24714b45cd1b | 1011 | acc0 = __SMLADX(x0, c0, acc0); |
xorjoep | 1:24714b45cd1b | 1012 | |
xorjoep | 1:24714b45cd1b | 1013 | /* acc1 += x[1] * y[srcBLen - 1] + x[2] * y[srcBLen - 2] */ |
xorjoep | 1:24714b45cd1b | 1014 | acc1 = __SMLADX(x1, c0, acc1); |
xorjoep | 1:24714b45cd1b | 1015 | |
xorjoep | 1:24714b45cd1b | 1016 | a = *px; |
xorjoep | 1:24714b45cd1b | 1017 | b = *(px + 1); |
xorjoep | 1:24714b45cd1b | 1018 | |
xorjoep | 1:24714b45cd1b | 1019 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1020 | |
xorjoep | 1:24714b45cd1b | 1021 | x2 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1022 | a = *(px + 2); |
xorjoep | 1:24714b45cd1b | 1023 | x3 = __PKHBT(b, a, 16); |
xorjoep | 1:24714b45cd1b | 1024 | |
xorjoep | 1:24714b45cd1b | 1025 | #else |
xorjoep | 1:24714b45cd1b | 1026 | |
xorjoep | 1:24714b45cd1b | 1027 | x2 = __PKHBT(b, a, 16); |
xorjoep | 1:24714b45cd1b | 1028 | a = *(px + 2); |
xorjoep | 1:24714b45cd1b | 1029 | x3 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1030 | |
xorjoep | 1:24714b45cd1b | 1031 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1032 | |
xorjoep | 1:24714b45cd1b | 1033 | /* acc2 += x[2] * y[srcBLen - 1] + x[3] * y[srcBLen - 2] */ |
xorjoep | 1:24714b45cd1b | 1034 | acc2 = __SMLADX(x2, c0, acc2); |
xorjoep | 1:24714b45cd1b | 1035 | |
xorjoep | 1:24714b45cd1b | 1036 | /* acc3 += x[3] * y[srcBLen - 1] + x[4] * y[srcBLen - 2] */ |
xorjoep | 1:24714b45cd1b | 1037 | acc3 = __SMLADX(x3, c0, acc3); |
xorjoep | 1:24714b45cd1b | 1038 | |
xorjoep | 1:24714b45cd1b | 1039 | /* Read y[srcBLen - 3] and y[srcBLen - 4] */ |
xorjoep | 1:24714b45cd1b | 1040 | a = *py; |
xorjoep | 1:24714b45cd1b | 1041 | b = *(py+1); |
xorjoep | 1:24714b45cd1b | 1042 | py -= 2; |
xorjoep | 1:24714b45cd1b | 1043 | |
xorjoep | 1:24714b45cd1b | 1044 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1045 | |
xorjoep | 1:24714b45cd1b | 1046 | c0 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1047 | |
xorjoep | 1:24714b45cd1b | 1048 | #else |
xorjoep | 1:24714b45cd1b | 1049 | |
xorjoep | 1:24714b45cd1b | 1050 | c0 = __PKHBT(b, a, 16);; |
xorjoep | 1:24714b45cd1b | 1051 | |
xorjoep | 1:24714b45cd1b | 1052 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1053 | |
xorjoep | 1:24714b45cd1b | 1054 | /* acc0 += x[2] * y[srcBLen - 3] + x[3] * y[srcBLen - 4] */ |
xorjoep | 1:24714b45cd1b | 1055 | acc0 = __SMLADX(x2, c0, acc0); |
xorjoep | 1:24714b45cd1b | 1056 | |
xorjoep | 1:24714b45cd1b | 1057 | /* acc1 += x[3] * y[srcBLen - 3] + x[4] * y[srcBLen - 4] */ |
xorjoep | 1:24714b45cd1b | 1058 | acc1 = __SMLADX(x3, c0, acc1); |
xorjoep | 1:24714b45cd1b | 1059 | |
xorjoep | 1:24714b45cd1b | 1060 | /* Read x[4], x[5], x[6] */ |
xorjoep | 1:24714b45cd1b | 1061 | a = *(px + 2); |
xorjoep | 1:24714b45cd1b | 1062 | b = *(px + 3); |
xorjoep | 1:24714b45cd1b | 1063 | |
xorjoep | 1:24714b45cd1b | 1064 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1065 | |
xorjoep | 1:24714b45cd1b | 1066 | x0 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1067 | a = *(px + 4); |
xorjoep | 1:24714b45cd1b | 1068 | x1 = __PKHBT(b, a, 16); |
xorjoep | 1:24714b45cd1b | 1069 | |
xorjoep | 1:24714b45cd1b | 1070 | #else |
xorjoep | 1:24714b45cd1b | 1071 | |
xorjoep | 1:24714b45cd1b | 1072 | x0 = __PKHBT(b, a, 16); |
xorjoep | 1:24714b45cd1b | 1073 | a = *(px + 4); |
xorjoep | 1:24714b45cd1b | 1074 | x1 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1075 | |
xorjoep | 1:24714b45cd1b | 1076 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1077 | |
xorjoep | 1:24714b45cd1b | 1078 | px += 4U; |
xorjoep | 1:24714b45cd1b | 1079 | |
xorjoep | 1:24714b45cd1b | 1080 | /* acc2 += x[4] * y[srcBLen - 3] + x[5] * y[srcBLen - 4] */ |
xorjoep | 1:24714b45cd1b | 1081 | acc2 = __SMLADX(x0, c0, acc2); |
xorjoep | 1:24714b45cd1b | 1082 | |
xorjoep | 1:24714b45cd1b | 1083 | /* acc3 += x[5] * y[srcBLen - 3] + x[6] * y[srcBLen - 4] */ |
xorjoep | 1:24714b45cd1b | 1084 | acc3 = __SMLADX(x1, c0, acc3); |
xorjoep | 1:24714b45cd1b | 1085 | |
xorjoep | 1:24714b45cd1b | 1086 | } while (--k); |
xorjoep | 1:24714b45cd1b | 1087 | |
xorjoep | 1:24714b45cd1b | 1088 | /* For the next MAC operations, SIMD is not used |
xorjoep | 1:24714b45cd1b | 1089 | * So, the 16 bit pointer if inputB, py is updated */ |
xorjoep | 1:24714b45cd1b | 1090 | |
xorjoep | 1:24714b45cd1b | 1091 | /* If the srcBLen is not a multiple of 4, compute any remaining MACs here. |
xorjoep | 1:24714b45cd1b | 1092 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 1093 | k = srcBLen % 0x4U; |
xorjoep | 1:24714b45cd1b | 1094 | |
xorjoep | 1:24714b45cd1b | 1095 | if (k == 1U) |
xorjoep | 1:24714b45cd1b | 1096 | { |
xorjoep | 1:24714b45cd1b | 1097 | /* Read y[srcBLen - 5] */ |
xorjoep | 1:24714b45cd1b | 1098 | c0 = *(py+1); |
xorjoep | 1:24714b45cd1b | 1099 | |
xorjoep | 1:24714b45cd1b | 1100 | #ifdef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1101 | |
xorjoep | 1:24714b45cd1b | 1102 | c0 = c0 << 16U; |
xorjoep | 1:24714b45cd1b | 1103 | |
xorjoep | 1:24714b45cd1b | 1104 | #else |
xorjoep | 1:24714b45cd1b | 1105 | |
xorjoep | 1:24714b45cd1b | 1106 | c0 = c0 & 0x0000FFFF; |
xorjoep | 1:24714b45cd1b | 1107 | |
xorjoep | 1:24714b45cd1b | 1108 | #endif /* #ifdef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1109 | |
xorjoep | 1:24714b45cd1b | 1110 | /* Read x[7] */ |
xorjoep | 1:24714b45cd1b | 1111 | a = *px; |
xorjoep | 1:24714b45cd1b | 1112 | b = *(px+1); |
xorjoep | 1:24714b45cd1b | 1113 | px++; |
xorjoep | 1:24714b45cd1b | 1114 | |
xorjoep | 1:24714b45cd1b | 1115 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1116 | |
xorjoep | 1:24714b45cd1b | 1117 | x3 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1118 | |
xorjoep | 1:24714b45cd1b | 1119 | #else |
xorjoep | 1:24714b45cd1b | 1120 | |
xorjoep | 1:24714b45cd1b | 1121 | x3 = __PKHBT(b, a, 16);; |
xorjoep | 1:24714b45cd1b | 1122 | |
xorjoep | 1:24714b45cd1b | 1123 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1124 | |
xorjoep | 1:24714b45cd1b | 1125 | |
xorjoep | 1:24714b45cd1b | 1126 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 1127 | acc0 = __SMLAD(x0, c0, acc0); |
xorjoep | 1:24714b45cd1b | 1128 | acc1 = __SMLAD(x1, c0, acc1); |
xorjoep | 1:24714b45cd1b | 1129 | acc2 = __SMLADX(x1, c0, acc2); |
xorjoep | 1:24714b45cd1b | 1130 | acc3 = __SMLADX(x3, c0, acc3); |
xorjoep | 1:24714b45cd1b | 1131 | } |
xorjoep | 1:24714b45cd1b | 1132 | |
xorjoep | 1:24714b45cd1b | 1133 | if (k == 2U) |
xorjoep | 1:24714b45cd1b | 1134 | { |
xorjoep | 1:24714b45cd1b | 1135 | /* Read y[srcBLen - 5], y[srcBLen - 6] */ |
xorjoep | 1:24714b45cd1b | 1136 | a = *py; |
xorjoep | 1:24714b45cd1b | 1137 | b = *(py+1); |
xorjoep | 1:24714b45cd1b | 1138 | |
xorjoep | 1:24714b45cd1b | 1139 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1140 | |
xorjoep | 1:24714b45cd1b | 1141 | c0 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1142 | |
xorjoep | 1:24714b45cd1b | 1143 | #else |
xorjoep | 1:24714b45cd1b | 1144 | |
xorjoep | 1:24714b45cd1b | 1145 | c0 = __PKHBT(b, a, 16);; |
xorjoep | 1:24714b45cd1b | 1146 | |
xorjoep | 1:24714b45cd1b | 1147 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1148 | |
xorjoep | 1:24714b45cd1b | 1149 | /* Read x[7], x[8], x[9] */ |
xorjoep | 1:24714b45cd1b | 1150 | a = *px; |
xorjoep | 1:24714b45cd1b | 1151 | b = *(px + 1); |
xorjoep | 1:24714b45cd1b | 1152 | |
xorjoep | 1:24714b45cd1b | 1153 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1154 | |
xorjoep | 1:24714b45cd1b | 1155 | x3 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1156 | a = *(px + 2); |
xorjoep | 1:24714b45cd1b | 1157 | x2 = __PKHBT(b, a, 16); |
xorjoep | 1:24714b45cd1b | 1158 | |
xorjoep | 1:24714b45cd1b | 1159 | #else |
xorjoep | 1:24714b45cd1b | 1160 | |
xorjoep | 1:24714b45cd1b | 1161 | x3 = __PKHBT(b, a, 16); |
xorjoep | 1:24714b45cd1b | 1162 | a = *(px + 2); |
xorjoep | 1:24714b45cd1b | 1163 | x2 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1164 | |
xorjoep | 1:24714b45cd1b | 1165 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1166 | px += 2U; |
xorjoep | 1:24714b45cd1b | 1167 | |
xorjoep | 1:24714b45cd1b | 1168 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 1169 | acc0 = __SMLADX(x0, c0, acc0); |
xorjoep | 1:24714b45cd1b | 1170 | acc1 = __SMLADX(x1, c0, acc1); |
xorjoep | 1:24714b45cd1b | 1171 | acc2 = __SMLADX(x3, c0, acc2); |
xorjoep | 1:24714b45cd1b | 1172 | acc3 = __SMLADX(x2, c0, acc3); |
xorjoep | 1:24714b45cd1b | 1173 | } |
xorjoep | 1:24714b45cd1b | 1174 | |
xorjoep | 1:24714b45cd1b | 1175 | if (k == 3U) |
xorjoep | 1:24714b45cd1b | 1176 | { |
xorjoep | 1:24714b45cd1b | 1177 | /* Read y[srcBLen - 5], y[srcBLen - 6] */ |
xorjoep | 1:24714b45cd1b | 1178 | a = *py; |
xorjoep | 1:24714b45cd1b | 1179 | b = *(py+1); |
xorjoep | 1:24714b45cd1b | 1180 | |
xorjoep | 1:24714b45cd1b | 1181 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1182 | |
xorjoep | 1:24714b45cd1b | 1183 | c0 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1184 | |
xorjoep | 1:24714b45cd1b | 1185 | #else |
xorjoep | 1:24714b45cd1b | 1186 | |
xorjoep | 1:24714b45cd1b | 1187 | c0 = __PKHBT(b, a, 16);; |
xorjoep | 1:24714b45cd1b | 1188 | |
xorjoep | 1:24714b45cd1b | 1189 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1190 | |
xorjoep | 1:24714b45cd1b | 1191 | /* Read x[7], x[8], x[9] */ |
xorjoep | 1:24714b45cd1b | 1192 | a = *px; |
xorjoep | 1:24714b45cd1b | 1193 | b = *(px + 1); |
xorjoep | 1:24714b45cd1b | 1194 | |
xorjoep | 1:24714b45cd1b | 1195 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1196 | |
xorjoep | 1:24714b45cd1b | 1197 | x3 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1198 | a = *(px + 2); |
xorjoep | 1:24714b45cd1b | 1199 | x2 = __PKHBT(b, a, 16); |
xorjoep | 1:24714b45cd1b | 1200 | |
xorjoep | 1:24714b45cd1b | 1201 | #else |
xorjoep | 1:24714b45cd1b | 1202 | |
xorjoep | 1:24714b45cd1b | 1203 | x3 = __PKHBT(b, a, 16); |
xorjoep | 1:24714b45cd1b | 1204 | a = *(px + 2); |
xorjoep | 1:24714b45cd1b | 1205 | x2 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1206 | |
xorjoep | 1:24714b45cd1b | 1207 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1208 | |
xorjoep | 1:24714b45cd1b | 1209 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 1210 | acc0 = __SMLADX(x0, c0, acc0); |
xorjoep | 1:24714b45cd1b | 1211 | acc1 = __SMLADX(x1, c0, acc1); |
xorjoep | 1:24714b45cd1b | 1212 | acc2 = __SMLADX(x3, c0, acc2); |
xorjoep | 1:24714b45cd1b | 1213 | acc3 = __SMLADX(x2, c0, acc3); |
xorjoep | 1:24714b45cd1b | 1214 | |
xorjoep | 1:24714b45cd1b | 1215 | /* Read y[srcBLen - 7] */ |
xorjoep | 1:24714b45cd1b | 1216 | c0 = *(py-1); |
xorjoep | 1:24714b45cd1b | 1217 | #ifdef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1218 | |
xorjoep | 1:24714b45cd1b | 1219 | c0 = c0 << 16U; |
xorjoep | 1:24714b45cd1b | 1220 | #else |
xorjoep | 1:24714b45cd1b | 1221 | |
xorjoep | 1:24714b45cd1b | 1222 | c0 = c0 & 0x0000FFFF; |
xorjoep | 1:24714b45cd1b | 1223 | #endif /* #ifdef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1224 | |
xorjoep | 1:24714b45cd1b | 1225 | /* Read x[10] */ |
xorjoep | 1:24714b45cd1b | 1226 | a = *(px+2); |
xorjoep | 1:24714b45cd1b | 1227 | b = *(px+3); |
xorjoep | 1:24714b45cd1b | 1228 | |
xorjoep | 1:24714b45cd1b | 1229 | #ifndef ARM_MATH_BIG_ENDIAN |
xorjoep | 1:24714b45cd1b | 1230 | |
xorjoep | 1:24714b45cd1b | 1231 | x3 = __PKHBT(a, b, 16); |
xorjoep | 1:24714b45cd1b | 1232 | |
xorjoep | 1:24714b45cd1b | 1233 | #else |
xorjoep | 1:24714b45cd1b | 1234 | |
xorjoep | 1:24714b45cd1b | 1235 | x3 = __PKHBT(b, a, 16);; |
xorjoep | 1:24714b45cd1b | 1236 | |
xorjoep | 1:24714b45cd1b | 1237 | #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
xorjoep | 1:24714b45cd1b | 1238 | |
xorjoep | 1:24714b45cd1b | 1239 | px += 3U; |
xorjoep | 1:24714b45cd1b | 1240 | |
xorjoep | 1:24714b45cd1b | 1241 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 1242 | acc0 = __SMLADX(x1, c0, acc0); |
xorjoep | 1:24714b45cd1b | 1243 | acc1 = __SMLAD(x2, c0, acc1); |
xorjoep | 1:24714b45cd1b | 1244 | acc2 = __SMLADX(x2, c0, acc2); |
xorjoep | 1:24714b45cd1b | 1245 | acc3 = __SMLADX(x3, c0, acc3); |
xorjoep | 1:24714b45cd1b | 1246 | } |
xorjoep | 1:24714b45cd1b | 1247 | |
xorjoep | 1:24714b45cd1b | 1248 | /* Store the results in the accumulators in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 1249 | *pOut++ = (q15_t)(acc0 >> 15); |
xorjoep | 1:24714b45cd1b | 1250 | *pOut++ = (q15_t)(acc1 >> 15); |
xorjoep | 1:24714b45cd1b | 1251 | *pOut++ = (q15_t)(acc2 >> 15); |
xorjoep | 1:24714b45cd1b | 1252 | *pOut++ = (q15_t)(acc3 >> 15); |
xorjoep | 1:24714b45cd1b | 1253 | |
xorjoep | 1:24714b45cd1b | 1254 | /* Increment the pointer pIn1 index, count by 4 */ |
xorjoep | 1:24714b45cd1b | 1255 | count += 4U; |
xorjoep | 1:24714b45cd1b | 1256 | |
xorjoep | 1:24714b45cd1b | 1257 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 1258 | px = pIn1 + count; |
xorjoep | 1:24714b45cd1b | 1259 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 1260 | |
xorjoep | 1:24714b45cd1b | 1261 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 1262 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 1263 | } |
xorjoep | 1:24714b45cd1b | 1264 | |
xorjoep | 1:24714b45cd1b | 1265 | /* If the blockSize2 is not a multiple of 4, compute any remaining output samples here. |
xorjoep | 1:24714b45cd1b | 1266 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 1267 | blkCnt = (uint32_t) blockSize2 % 0x4U; |
xorjoep | 1:24714b45cd1b | 1268 | |
xorjoep | 1:24714b45cd1b | 1269 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 1270 | { |
xorjoep | 1:24714b45cd1b | 1271 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 1272 | sum = 0; |
xorjoep | 1:24714b45cd1b | 1273 | |
xorjoep | 1:24714b45cd1b | 1274 | /* Apply loop unrolling and compute 4 MACs simultaneously. */ |
xorjoep | 1:24714b45cd1b | 1275 | k = srcBLen >> 2U; |
xorjoep | 1:24714b45cd1b | 1276 | |
xorjoep | 1:24714b45cd1b | 1277 | /* First part of the processing with loop unrolling. Compute 4 MACs at a time. |
xorjoep | 1:24714b45cd1b | 1278 | ** a second loop below computes MACs for the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 1279 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 1280 | { |
xorjoep | 1:24714b45cd1b | 1281 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 1282 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1283 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1284 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1285 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1286 | |
xorjoep | 1:24714b45cd1b | 1287 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 1288 | k--; |
xorjoep | 1:24714b45cd1b | 1289 | } |
xorjoep | 1:24714b45cd1b | 1290 | |
xorjoep | 1:24714b45cd1b | 1291 | /* If the srcBLen is not a multiple of 4, compute any remaining MACs here. |
xorjoep | 1:24714b45cd1b | 1292 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 1293 | k = srcBLen % 0x4U; |
xorjoep | 1:24714b45cd1b | 1294 | |
xorjoep | 1:24714b45cd1b | 1295 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 1296 | { |
xorjoep | 1:24714b45cd1b | 1297 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 1298 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1299 | |
xorjoep | 1:24714b45cd1b | 1300 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 1301 | k--; |
xorjoep | 1:24714b45cd1b | 1302 | } |
xorjoep | 1:24714b45cd1b | 1303 | |
xorjoep | 1:24714b45cd1b | 1304 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 1305 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 1306 | |
xorjoep | 1:24714b45cd1b | 1307 | /* Increment the pointer pIn1 index, count by 1 */ |
xorjoep | 1:24714b45cd1b | 1308 | count++; |
xorjoep | 1:24714b45cd1b | 1309 | |
xorjoep | 1:24714b45cd1b | 1310 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 1311 | px = pIn1 + count; |
xorjoep | 1:24714b45cd1b | 1312 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 1313 | |
xorjoep | 1:24714b45cd1b | 1314 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 1315 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 1316 | } |
xorjoep | 1:24714b45cd1b | 1317 | } |
xorjoep | 1:24714b45cd1b | 1318 | else |
xorjoep | 1:24714b45cd1b | 1319 | { |
xorjoep | 1:24714b45cd1b | 1320 | /* If the srcBLen is not a multiple of 4, |
xorjoep | 1:24714b45cd1b | 1321 | * the blockSize2 loop cannot be unrolled by 4 */ |
xorjoep | 1:24714b45cd1b | 1322 | blkCnt = (uint32_t) blockSize2; |
xorjoep | 1:24714b45cd1b | 1323 | |
xorjoep | 1:24714b45cd1b | 1324 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 1325 | { |
xorjoep | 1:24714b45cd1b | 1326 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 1327 | sum = 0; |
xorjoep | 1:24714b45cd1b | 1328 | |
xorjoep | 1:24714b45cd1b | 1329 | /* srcBLen number of MACS should be performed */ |
xorjoep | 1:24714b45cd1b | 1330 | k = srcBLen; |
xorjoep | 1:24714b45cd1b | 1331 | |
xorjoep | 1:24714b45cd1b | 1332 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 1333 | { |
xorjoep | 1:24714b45cd1b | 1334 | /* Perform the multiply-accumulate */ |
xorjoep | 1:24714b45cd1b | 1335 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1336 | |
xorjoep | 1:24714b45cd1b | 1337 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 1338 | k--; |
xorjoep | 1:24714b45cd1b | 1339 | } |
xorjoep | 1:24714b45cd1b | 1340 | |
xorjoep | 1:24714b45cd1b | 1341 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 1342 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 1343 | |
xorjoep | 1:24714b45cd1b | 1344 | /* Increment the MAC count */ |
xorjoep | 1:24714b45cd1b | 1345 | count++; |
xorjoep | 1:24714b45cd1b | 1346 | |
xorjoep | 1:24714b45cd1b | 1347 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 1348 | px = pIn1 + count; |
xorjoep | 1:24714b45cd1b | 1349 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 1350 | |
xorjoep | 1:24714b45cd1b | 1351 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 1352 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 1353 | } |
xorjoep | 1:24714b45cd1b | 1354 | } |
xorjoep | 1:24714b45cd1b | 1355 | |
xorjoep | 1:24714b45cd1b | 1356 | |
xorjoep | 1:24714b45cd1b | 1357 | /* -------------------------- |
xorjoep | 1:24714b45cd1b | 1358 | * Initializations of stage3 |
xorjoep | 1:24714b45cd1b | 1359 | * -------------------------*/ |
xorjoep | 1:24714b45cd1b | 1360 | |
xorjoep | 1:24714b45cd1b | 1361 | /* sum += x[srcALen-srcBLen+1] * y[srcBLen-1] + x[srcALen-srcBLen+2] * y[srcBLen-2] +...+ x[srcALen-1] * y[1] |
xorjoep | 1:24714b45cd1b | 1362 | * sum += x[srcALen-srcBLen+2] * y[srcBLen-1] + x[srcALen-srcBLen+3] * y[srcBLen-2] +...+ x[srcALen-1] * y[2] |
xorjoep | 1:24714b45cd1b | 1363 | * .... |
xorjoep | 1:24714b45cd1b | 1364 | * sum += x[srcALen-2] * y[srcBLen-1] + x[srcALen-1] * y[srcBLen-2] |
xorjoep | 1:24714b45cd1b | 1365 | * sum += x[srcALen-1] * y[srcBLen-1] |
xorjoep | 1:24714b45cd1b | 1366 | */ |
xorjoep | 1:24714b45cd1b | 1367 | |
xorjoep | 1:24714b45cd1b | 1368 | /* In this stage the MAC operations are decreased by 1 for every iteration. |
xorjoep | 1:24714b45cd1b | 1369 | The count variable holds the number of MAC operations performed */ |
xorjoep | 1:24714b45cd1b | 1370 | count = srcBLen - 1U; |
xorjoep | 1:24714b45cd1b | 1371 | |
xorjoep | 1:24714b45cd1b | 1372 | /* Working pointer of inputA */ |
xorjoep | 1:24714b45cd1b | 1373 | pSrc1 = (pIn1 + srcALen) - (srcBLen - 1U); |
xorjoep | 1:24714b45cd1b | 1374 | px = pSrc1; |
xorjoep | 1:24714b45cd1b | 1375 | |
xorjoep | 1:24714b45cd1b | 1376 | /* Working pointer of inputB */ |
xorjoep | 1:24714b45cd1b | 1377 | pSrc2 = pIn2 + (srcBLen - 1U); |
xorjoep | 1:24714b45cd1b | 1378 | pIn2 = pSrc2 - 1U; |
xorjoep | 1:24714b45cd1b | 1379 | py = pIn2; |
xorjoep | 1:24714b45cd1b | 1380 | |
xorjoep | 1:24714b45cd1b | 1381 | /* ------------------- |
xorjoep | 1:24714b45cd1b | 1382 | * Stage3 process |
xorjoep | 1:24714b45cd1b | 1383 | * ------------------*/ |
xorjoep | 1:24714b45cd1b | 1384 | |
xorjoep | 1:24714b45cd1b | 1385 | /* For loop unrolling by 4, this stage is divided into two. */ |
xorjoep | 1:24714b45cd1b | 1386 | /* First part of this stage computes the MAC operations greater than 4 */ |
xorjoep | 1:24714b45cd1b | 1387 | /* Second part of this stage computes the MAC operations less than or equal to 4 */ |
xorjoep | 1:24714b45cd1b | 1388 | |
xorjoep | 1:24714b45cd1b | 1389 | /* The first part of the stage starts here */ |
xorjoep | 1:24714b45cd1b | 1390 | j = count >> 2U; |
xorjoep | 1:24714b45cd1b | 1391 | |
xorjoep | 1:24714b45cd1b | 1392 | while ((j > 0U) && (blockSize3 > 0)) |
xorjoep | 1:24714b45cd1b | 1393 | { |
xorjoep | 1:24714b45cd1b | 1394 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 1395 | sum = 0; |
xorjoep | 1:24714b45cd1b | 1396 | |
xorjoep | 1:24714b45cd1b | 1397 | /* Apply loop unrolling and compute 4 MACs simultaneously. */ |
xorjoep | 1:24714b45cd1b | 1398 | k = count >> 2U; |
xorjoep | 1:24714b45cd1b | 1399 | |
xorjoep | 1:24714b45cd1b | 1400 | /* First part of the processing with loop unrolling. Compute 4 MACs at a time. |
xorjoep | 1:24714b45cd1b | 1401 | ** a second loop below computes MACs for the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 1402 | py++; |
xorjoep | 1:24714b45cd1b | 1403 | |
xorjoep | 1:24714b45cd1b | 1404 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 1405 | { |
xorjoep | 1:24714b45cd1b | 1406 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 1407 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1408 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1409 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1410 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1411 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 1412 | k--; |
xorjoep | 1:24714b45cd1b | 1413 | } |
xorjoep | 1:24714b45cd1b | 1414 | |
xorjoep | 1:24714b45cd1b | 1415 | |
xorjoep | 1:24714b45cd1b | 1416 | /* If the count is not a multiple of 4, compute any remaining MACs here. |
xorjoep | 1:24714b45cd1b | 1417 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 1418 | k = count % 0x4U; |
xorjoep | 1:24714b45cd1b | 1419 | |
xorjoep | 1:24714b45cd1b | 1420 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 1421 | { |
xorjoep | 1:24714b45cd1b | 1422 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 1423 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1424 | |
xorjoep | 1:24714b45cd1b | 1425 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 1426 | k--; |
xorjoep | 1:24714b45cd1b | 1427 | } |
xorjoep | 1:24714b45cd1b | 1428 | |
xorjoep | 1:24714b45cd1b | 1429 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 1430 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 1431 | |
xorjoep | 1:24714b45cd1b | 1432 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 1433 | px = ++pSrc1; |
xorjoep | 1:24714b45cd1b | 1434 | py = pIn2; |
xorjoep | 1:24714b45cd1b | 1435 | |
xorjoep | 1:24714b45cd1b | 1436 | /* Decrement the MAC count */ |
xorjoep | 1:24714b45cd1b | 1437 | count--; |
xorjoep | 1:24714b45cd1b | 1438 | |
xorjoep | 1:24714b45cd1b | 1439 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 1440 | blockSize3--; |
xorjoep | 1:24714b45cd1b | 1441 | |
xorjoep | 1:24714b45cd1b | 1442 | j--; |
xorjoep | 1:24714b45cd1b | 1443 | } |
xorjoep | 1:24714b45cd1b | 1444 | |
xorjoep | 1:24714b45cd1b | 1445 | /* The second part of the stage starts here */ |
xorjoep | 1:24714b45cd1b | 1446 | /* SIMD is not used for the next MAC operations, |
xorjoep | 1:24714b45cd1b | 1447 | * so pointer py is updated to read only one sample at a time */ |
xorjoep | 1:24714b45cd1b | 1448 | py = py + 1U; |
xorjoep | 1:24714b45cd1b | 1449 | |
xorjoep | 1:24714b45cd1b | 1450 | while (blockSize3 > 0) |
xorjoep | 1:24714b45cd1b | 1451 | { |
xorjoep | 1:24714b45cd1b | 1452 | /* Accumulator is made zero for every iteration */ |
xorjoep | 1:24714b45cd1b | 1453 | sum = 0; |
xorjoep | 1:24714b45cd1b | 1454 | |
xorjoep | 1:24714b45cd1b | 1455 | /* Apply loop unrolling and compute 4 MACs simultaneously. */ |
xorjoep | 1:24714b45cd1b | 1456 | k = count; |
xorjoep | 1:24714b45cd1b | 1457 | |
xorjoep | 1:24714b45cd1b | 1458 | while (k > 0U) |
xorjoep | 1:24714b45cd1b | 1459 | { |
xorjoep | 1:24714b45cd1b | 1460 | /* Perform the multiply-accumulates */ |
xorjoep | 1:24714b45cd1b | 1461 | /* sum += x[srcALen-1] * y[srcBLen-1] */ |
xorjoep | 1:24714b45cd1b | 1462 | sum += ((q31_t) * px++ * *py--); |
xorjoep | 1:24714b45cd1b | 1463 | |
xorjoep | 1:24714b45cd1b | 1464 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 1465 | k--; |
xorjoep | 1:24714b45cd1b | 1466 | } |
xorjoep | 1:24714b45cd1b | 1467 | |
xorjoep | 1:24714b45cd1b | 1468 | /* Store the result in the accumulator in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 1469 | *pOut++ = (q15_t) (sum >> 15); |
xorjoep | 1:24714b45cd1b | 1470 | |
xorjoep | 1:24714b45cd1b | 1471 | /* Update the inputA and inputB pointers for next MAC calculation */ |
xorjoep | 1:24714b45cd1b | 1472 | px = ++pSrc1; |
xorjoep | 1:24714b45cd1b | 1473 | py = pSrc2; |
xorjoep | 1:24714b45cd1b | 1474 | |
xorjoep | 1:24714b45cd1b | 1475 | /* Decrement the MAC count */ |
xorjoep | 1:24714b45cd1b | 1476 | count--; |
xorjoep | 1:24714b45cd1b | 1477 | |
xorjoep | 1:24714b45cd1b | 1478 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 1479 | blockSize3--; |
xorjoep | 1:24714b45cd1b | 1480 | } |
xorjoep | 1:24714b45cd1b | 1481 | |
xorjoep | 1:24714b45cd1b | 1482 | /* set status as ARM_MATH_SUCCESS */ |
xorjoep | 1:24714b45cd1b | 1483 | status = ARM_MATH_SUCCESS; |
xorjoep | 1:24714b45cd1b | 1484 | } |
xorjoep | 1:24714b45cd1b | 1485 | |
xorjoep | 1:24714b45cd1b | 1486 | /* Return to application */ |
xorjoep | 1:24714b45cd1b | 1487 | return (status); |
xorjoep | 1:24714b45cd1b | 1488 | |
xorjoep | 1:24714b45cd1b | 1489 | #endif /* #ifndef UNALIGNED_SUPPORT_DISABLE */ |
xorjoep | 1:24714b45cd1b | 1490 | } |
xorjoep | 1:24714b45cd1b | 1491 | |
xorjoep | 1:24714b45cd1b | 1492 | /** |
xorjoep | 1:24714b45cd1b | 1493 | * @} end of PartialConv group |
xorjoep | 1:24714b45cd1b | 1494 | */ |