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author | Ali Labbene <ali.labbene@st.com> | 2019-12-11 08:59:21 +0100 |
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committer | Ali Labbene <ali.labbene@st.com> | 2019-12-16 16:35:24 +0100 |
commit | 9f95ff5b6ba01db09552b84a0ab79607060a2666 (patch) | |
tree | 8a6e0dda832555c692307869aed49d07ee7facfe /DSP_Lib/Source/FilteringFunctions/arm_conv_fast_q31.c | |
parent | 76177aa280494bb36d7a0bcbda1078d4db717020 (diff) | |
download | st-cmsis-core-lowfat-9f95ff5b6ba01db09552b84a0ab79607060a2666.tar.gz st-cmsis-core-lowfat-9f95ff5b6ba01db09552b84a0ab79607060a2666.tar.bz2 st-cmsis-core-lowfat-9f95ff5b6ba01db09552b84a0ab79607060a2666.zip |
Official ARM version: v5.4.0
Add CMSIS V5.4.0, please refer to index.html available under \docs folder.
Note: content of \CMSIS\Core\Include has been copied under \Include to keep the same structure
used in existing projects, and thus avoid projects mass update
Note: the following components have been removed from ARM original delivery (as not used in ST packages)
- CMSIS_EW2018.pdf
- .gitattributes
- .gitignore
- \Device
- \CMSIS
- \CoreValidation
- \DAP
- \Documentation
- \DoxyGen
- \Driver
- \Pack
- \RTOS\CMSIS_RTOS_Tutorial.pdf
- \RTOS\RTX
- \RTOS\Template
- \RTOS2\RTX
- \Utilities
- All ARM/GCC projects files are deleted from \DSP, \RTOS and \RTOS2
Change-Id: Ia026c3f0f0d016627a4fb5a9032852c33d24b4d3
Diffstat (limited to 'DSP_Lib/Source/FilteringFunctions/arm_conv_fast_q31.c')
-rw-r--r-- | DSP_Lib/Source/FilteringFunctions/arm_conv_fast_q31.c | 577 |
1 files changed, 0 insertions, 577 deletions
diff --git a/DSP_Lib/Source/FilteringFunctions/arm_conv_fast_q31.c b/DSP_Lib/Source/FilteringFunctions/arm_conv_fast_q31.c deleted file mode 100644 index 4111a1e..0000000 --- a/DSP_Lib/Source/FilteringFunctions/arm_conv_fast_q31.c +++ /dev/null @@ -1,577 +0,0 @@ -/* ---------------------------------------------------------------------- -* Copyright (C) 2010-2014 ARM Limited. All rights reserved. -* -* $Date: 19. March 2015 -* $Revision: V.1.4.5 -* -* Project: CMSIS DSP Library -* Title: arm_conv_fast_q31.c -* -* Description: Q31 Convolution (fast version). -* -* Target Processor: Cortex-M4/Cortex-M3 -* -* Redistribution and use in source and binary forms, with or without -* modification, are permitted provided that the following conditions -* are met: -* - Redistributions of source code must retain the above copyright -* notice, this list of conditions and the following disclaimer. -* - Redistributions in binary form must reproduce the above copyright -* notice, this list of conditions and the following disclaimer in -* the documentation and/or other materials provided with the -* distribution. -* - Neither the name of ARM LIMITED nor the names of its contributors -* may be used to endorse or promote products derived from this -* software without specific prior written permission. -* -* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS -* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE -* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, -* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, -* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER -* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN -* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -* POSSIBILITY OF SUCH DAMAGE. -* -------------------------------------------------------------------- */ - -#include "arm_math.h" - -/** - * @ingroup groupFilters - */ - -/** - * @addtogroup Conv - * @{ - */ - -/** - * @param[in] *pSrcA points to the first input sequence. - * @param[in] srcALen length of the first input sequence. - * @param[in] *pSrcB points to the second input sequence. - * @param[in] srcBLen length of the second input sequence. - * @param[out] *pDst points to the location where the output result is written. Length srcALen+srcBLen-1. - * @return none. - * - * @details - * <b>Scaling and Overflow Behavior:</b> - * - * \par - * This function is optimized for speed at the expense of fixed-point precision and overflow protection. - * The result of each 1.31 x 1.31 multiplication is truncated to 2.30 format. - * These intermediate results are accumulated in a 32-bit register in 2.30 format. - * Finally, the accumulator is saturated and converted to a 1.31 result. - * - * \par - * The fast version has the same overflow behavior as the standard version but provides less precision since it discards the low 32 bits of each multiplication result. - * In order to avoid overflows completely the input signals must be scaled down. - * Scale down the inputs by log2(min(srcALen, srcBLen)) (log2 is read as log to the base 2) times to avoid overflows, - * as maximum of min(srcALen, srcBLen) number of additions are carried internally. - * - * \par - * See <code>arm_conv_q31()</code> for a slower implementation of this function which uses 64-bit accumulation to provide higher precision. - */ - -void arm_conv_fast_q31( - q31_t * pSrcA, - uint32_t srcALen, - q31_t * pSrcB, - uint32_t srcBLen, - q31_t * pDst) -{ - q31_t *pIn1; /* inputA pointer */ - q31_t *pIn2; /* inputB pointer */ - q31_t *pOut = pDst; /* output pointer */ - q31_t *px; /* Intermediate inputA pointer */ - q31_t *py; /* Intermediate inputB pointer */ - q31_t *pSrc1, *pSrc2; /* Intermediate pointers */ - q31_t sum, acc0, acc1, acc2, acc3; /* Accumulator */ - q31_t x0, x1, x2, x3, c0; /* Temporary variables to hold state and coefficient values */ - uint32_t j, k, count, blkCnt, blockSize1, blockSize2, blockSize3; /* loop counter */ - - /* The algorithm implementation is based on the lengths of the inputs. */ - /* srcB is always made to slide across srcA. */ - /* So srcBLen is always considered as shorter or equal to srcALen */ - if(srcALen >= srcBLen) - { - /* Initialization of inputA pointer */ - pIn1 = pSrcA; - - /* Initialization of inputB pointer */ - pIn2 = pSrcB; - } - else - { - /* Initialization of inputA pointer */ - pIn1 = pSrcB; - - /* Initialization of inputB pointer */ - pIn2 = pSrcA; - - /* srcBLen is always considered as shorter or equal to srcALen */ - j = srcBLen; - srcBLen = srcALen; - srcALen = j; - } - - /* 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] */ - /* The function is internally - * divided into three stages according to the number of multiplications that has to be - * taken place between inputA samples and inputB samples. In the first stage of the - * algorithm, the multiplications increase by one for every iteration. - * In the second stage of the algorithm, srcBLen number of multiplications are done. - * In the third stage of the algorithm, the multiplications decrease by one - * for every iteration. */ - - /* The algorithm is implemented in three stages. - The loop counters of each stage is initiated here. */ - blockSize1 = srcBLen - 1u; - blockSize2 = srcALen - (srcBLen - 1u); - blockSize3 = blockSize1; - - /* -------------------------- - * Initializations of stage1 - * -------------------------*/ - - /* sum = x[0] * y[0] - * sum = x[0] * y[1] + x[1] * y[0] - * .... - * sum = x[0] * y[srcBlen - 1] + x[1] * y[srcBlen - 2] +...+ x[srcBLen - 1] * y[0] - */ - - /* In this stage the MAC operations are increased by 1 for every iteration. - The count variable holds the number of MAC operations performed */ - count = 1u; - - /* Working pointer of inputA */ - px = pIn1; - - /* Working pointer of inputB */ - py = pIn2; - - - /* ------------------------ - * Stage1 process - * ----------------------*/ - - /* The first stage starts here */ - while(blockSize1 > 0u) - { - /* Accumulator is made zero for every iteration */ - sum = 0; - - /* Apply loop unrolling and compute 4 MACs simultaneously. */ - k = count >> 2u; - - /* First part of the processing with loop unrolling. Compute 4 MACs at a time. - ** a second loop below computes MACs for the remaining 1 to 3 samples. */ - while(k > 0u) - { - /* x[0] * y[srcBLen - 1] */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* x[1] * y[srcBLen - 2] */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* x[2] * y[srcBLen - 3] */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* x[3] * y[srcBLen - 4] */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* Decrement the loop counter */ - k--; - } - - /* If the count is not a multiple of 4, compute any remaining MACs here. - ** No loop unrolling is used. */ - k = count % 0x4u; - - while(k > 0u) - { - /* Perform the multiply-accumulate */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* Decrement the loop counter */ - k--; - } - - /* Store the result in the accumulator in the destination buffer. */ - *pOut++ = sum << 1; - - /* Update the inputA and inputB pointers for next MAC calculation */ - py = pIn2 + count; - px = pIn1; - - /* Increment the MAC count */ - count++; - - /* Decrement the loop counter */ - blockSize1--; - } - - /* -------------------------- - * Initializations of stage2 - * ------------------------*/ - - /* sum = x[0] * y[srcBLen-1] + x[1] * y[srcBLen-2] +...+ x[srcBLen-1] * y[0] - * sum = x[1] * y[srcBLen-1] + x[2] * y[srcBLen-2] +...+ x[srcBLen] * y[0] - * .... - * sum = x[srcALen-srcBLen-2] * y[srcBLen-1] + x[srcALen] * y[srcBLen-2] +...+ x[srcALen-1] * y[0] - */ - - /* Working pointer of inputA */ - px = pIn1; - - /* Working pointer of inputB */ - pSrc2 = pIn2 + (srcBLen - 1u); - py = pSrc2; - - /* count is index by which the pointer pIn1 to be incremented */ - count = 0u; - - /* ------------------- - * Stage2 process - * ------------------*/ - - /* Stage2 depends on srcBLen as in this stage srcBLen number of MACS are performed. - * So, to loop unroll over blockSize2, - * srcBLen should be greater than or equal to 4 */ - if(srcBLen >= 4u) - { - /* Loop unroll over blockSize2, by 4 */ - blkCnt = blockSize2 >> 2u; - - while(blkCnt > 0u) - { - /* Set all accumulators to zero */ - acc0 = 0; - acc1 = 0; - acc2 = 0; - acc3 = 0; - - /* read x[0], x[1], x[2] samples */ - x0 = *(px++); - x1 = *(px++); - x2 = *(px++); - - /* Apply loop unrolling and compute 4 MACs simultaneously. */ - k = srcBLen >> 2u; - - /* First part of the processing with loop unrolling. Compute 4 MACs at a time. - ** a second loop below computes MACs for the remaining 1 to 3 samples. */ - do - { - /* Read y[srcBLen - 1] sample */ - c0 = *(py--); - - /* Read x[3] sample */ - x3 = *(px++); - - /* Perform the multiply-accumulates */ - /* acc0 += x[0] * y[srcBLen - 1] */ - acc0 = (q31_t) ((((q63_t) acc0 << 32) + ((q63_t) x0 * c0)) >> 32); - - /* acc1 += x[1] * y[srcBLen - 1] */ - acc1 = (q31_t) ((((q63_t) acc1 << 32) + ((q63_t) x1 * c0)) >> 32); - - /* acc2 += x[2] * y[srcBLen - 1] */ - acc2 = (q31_t) ((((q63_t) acc2 << 32) + ((q63_t) x2 * c0)) >> 32); - - /* acc3 += x[3] * y[srcBLen - 1] */ - acc3 = (q31_t) ((((q63_t) acc3 << 32) + ((q63_t) x3 * c0)) >> 32); - - /* Read y[srcBLen - 2] sample */ - c0 = *(py--); - - /* Read x[4] sample */ - x0 = *(px++); - - /* Perform the multiply-accumulate */ - /* acc0 += x[1] * y[srcBLen - 2] */ - acc0 = (q31_t) ((((q63_t) acc0 << 32) + ((q63_t) x1 * c0)) >> 32); - /* acc1 += x[2] * y[srcBLen - 2] */ - acc1 = (q31_t) ((((q63_t) acc1 << 32) + ((q63_t) x2 * c0)) >> 32); - /* acc2 += x[3] * y[srcBLen - 2] */ - acc2 = (q31_t) ((((q63_t) acc2 << 32) + ((q63_t) x3 * c0)) >> 32); - /* acc3 += x[4] * y[srcBLen - 2] */ - acc3 = (q31_t) ((((q63_t) acc3 << 32) + ((q63_t) x0 * c0)) >> 32); - - /* Read y[srcBLen - 3] sample */ - c0 = *(py--); - - /* Read x[5] sample */ - x1 = *(px++); - - /* Perform the multiply-accumulates */ - /* acc0 += x[2] * y[srcBLen - 3] */ - acc0 = (q31_t) ((((q63_t) acc0 << 32) + ((q63_t) x2 * c0)) >> 32); - /* acc1 += x[3] * y[srcBLen - 3] */ - acc1 = (q31_t) ((((q63_t) acc1 << 32) + ((q63_t) x3 * c0)) >> 32); - /* acc2 += x[4] * y[srcBLen - 3] */ - acc2 = (q31_t) ((((q63_t) acc2 << 32) + ((q63_t) x0 * c0)) >> 32); - /* acc3 += x[5] * y[srcBLen - 3] */ - acc3 = (q31_t) ((((q63_t) acc3 << 32) + ((q63_t) x1 * c0)) >> 32); - - /* Read y[srcBLen - 4] sample */ - c0 = *(py--); - - /* Read x[6] sample */ - x2 = *(px++); - - /* Perform the multiply-accumulates */ - /* acc0 += x[3] * y[srcBLen - 4] */ - acc0 = (q31_t) ((((q63_t) acc0 << 32) + ((q63_t) x3 * c0)) >> 32); - /* acc1 += x[4] * y[srcBLen - 4] */ - acc1 = (q31_t) ((((q63_t) acc1 << 32) + ((q63_t) x0 * c0)) >> 32); - /* acc2 += x[5] * y[srcBLen - 4] */ - acc2 = (q31_t) ((((q63_t) acc2 << 32) + ((q63_t) x1 * c0)) >> 32); - /* acc3 += x[6] * y[srcBLen - 4] */ - acc3 = (q31_t) ((((q63_t) acc3 << 32) + ((q63_t) x2 * c0)) >> 32); - - - } while(--k); - - /* If the srcBLen is not a multiple of 4, compute any remaining MACs here. - ** No loop unrolling is used. */ - k = srcBLen % 0x4u; - - while(k > 0u) - { - /* Read y[srcBLen - 5] sample */ - c0 = *(py--); - - /* Read x[7] sample */ - x3 = *(px++); - - /* Perform the multiply-accumulates */ - /* acc0 += x[4] * y[srcBLen - 5] */ - acc0 = (q31_t) ((((q63_t) acc0 << 32) + ((q63_t) x0 * c0)) >> 32); - /* acc1 += x[5] * y[srcBLen - 5] */ - acc1 = (q31_t) ((((q63_t) acc1 << 32) + ((q63_t) x1 * c0)) >> 32); - /* acc2 += x[6] * y[srcBLen - 5] */ - acc2 = (q31_t) ((((q63_t) acc2 << 32) + ((q63_t) x2 * c0)) >> 32); - /* acc3 += x[7] * y[srcBLen - 5] */ - acc3 = (q31_t) ((((q63_t) acc3 << 32) + ((q63_t) x3 * c0)) >> 32); - - /* Reuse the present samples for the next MAC */ - x0 = x1; - x1 = x2; - x2 = x3; - - /* Decrement the loop counter */ - k--; - } - - /* Store the results in the accumulators in the destination buffer. */ - *pOut++ = (q31_t) (acc0 << 1); - *pOut++ = (q31_t) (acc1 << 1); - *pOut++ = (q31_t) (acc2 << 1); - *pOut++ = (q31_t) (acc3 << 1); - - /* Increment the pointer pIn1 index, count by 4 */ - count += 4u; - - /* Update the inputA and inputB pointers for next MAC calculation */ - px = pIn1 + count; - py = pSrc2; - - /* Decrement the loop counter */ - blkCnt--; - } - - /* If the blockSize2 is not a multiple of 4, compute any remaining output samples here. - ** No loop unrolling is used. */ - blkCnt = blockSize2 % 0x4u; - - while(blkCnt > 0u) - { - /* Accumulator is made zero for every iteration */ - sum = 0; - - /* Apply loop unrolling and compute 4 MACs simultaneously. */ - k = srcBLen >> 2u; - - /* First part of the processing with loop unrolling. Compute 4 MACs at a time. - ** a second loop below computes MACs for the remaining 1 to 3 samples. */ - while(k > 0u) - { - /* Perform the multiply-accumulates */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* Decrement the loop counter */ - k--; - } - - /* If the srcBLen is not a multiple of 4, compute any remaining MACs here. - ** No loop unrolling is used. */ - k = srcBLen % 0x4u; - - while(k > 0u) - { - /* Perform the multiply-accumulate */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* Decrement the loop counter */ - k--; - } - - /* Store the result in the accumulator in the destination buffer. */ - *pOut++ = sum << 1; - - /* Increment the MAC count */ - count++; - - /* Update the inputA and inputB pointers for next MAC calculation */ - px = pIn1 + count; - py = pSrc2; - - /* Decrement the loop counter */ - blkCnt--; - } - } - else - { - /* If the srcBLen is not a multiple of 4, - * the blockSize2 loop cannot be unrolled by 4 */ - blkCnt = blockSize2; - - while(blkCnt > 0u) - { - /* Accumulator is made zero for every iteration */ - sum = 0; - - /* srcBLen number of MACS should be performed */ - k = srcBLen; - - while(k > 0u) - { - /* Perform the multiply-accumulate */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* Decrement the loop counter */ - k--; - } - - /* Store the result in the accumulator in the destination buffer. */ - *pOut++ = sum << 1; - - /* Increment the MAC count */ - count++; - - /* Update the inputA and inputB pointers for next MAC calculation */ - px = pIn1 + count; - py = pSrc2; - - /* Decrement the loop counter */ - blkCnt--; - } - } - - - /* -------------------------- - * Initializations of stage3 - * -------------------------*/ - - /* sum += x[srcALen-srcBLen+1] * y[srcBLen-1] + x[srcALen-srcBLen+2] * y[srcBLen-2] +...+ x[srcALen-1] * y[1] - * sum += x[srcALen-srcBLen+2] * y[srcBLen-1] + x[srcALen-srcBLen+3] * y[srcBLen-2] +...+ x[srcALen-1] * y[2] - * .... - * sum += x[srcALen-2] * y[srcBLen-1] + x[srcALen-1] * y[srcBLen-2] - * sum += x[srcALen-1] * y[srcBLen-1] - */ - - /* In this stage the MAC operations are decreased by 1 for every iteration. - The blockSize3 variable holds the number of MAC operations performed */ - - /* Working pointer of inputA */ - pSrc1 = (pIn1 + srcALen) - (srcBLen - 1u); - px = pSrc1; - - /* Working pointer of inputB */ - pSrc2 = pIn2 + (srcBLen - 1u); - py = pSrc2; - - /* ------------------- - * Stage3 process - * ------------------*/ - - while(blockSize3 > 0u) - { - /* Accumulator is made zero for every iteration */ - sum = 0; - - /* Apply loop unrolling and compute 4 MACs simultaneously. */ - k = blockSize3 >> 2u; - - /* First part of the processing with loop unrolling. Compute 4 MACs at a time. - ** a second loop below computes MACs for the remaining 1 to 3 samples. */ - while(k > 0u) - { - /* sum += x[srcALen - srcBLen + 1] * y[srcBLen - 1] */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* sum += x[srcALen - srcBLen + 2] * y[srcBLen - 2] */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* sum += x[srcALen - srcBLen + 3] * y[srcBLen - 3] */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* sum += x[srcALen - srcBLen + 4] * y[srcBLen - 4] */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* Decrement the loop counter */ - k--; - } - - /* If the blockSize3 is not a multiple of 4, compute any remaining MACs here. - ** No loop unrolling is used. */ - k = blockSize3 % 0x4u; - - while(k > 0u) - { - /* Perform the multiply-accumulate */ - sum = (q31_t) ((((q63_t) sum << 32) + - ((q63_t) * px++ * (*py--))) >> 32); - - /* Decrement the loop counter */ - k--; - } - - /* Store the result in the accumulator in the destination buffer. */ - *pOut++ = sum << 1; - - /* Update the inputA and inputB pointers for next MAC calculation */ - px = ++pSrc1; - py = pSrc2; - - /* Decrement the loop counter */ - blockSize3--; - } - -} - -/** - * @} end of Conv group - */ |