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179 lines
5.2 KiB
179 lines
5.2 KiB
/* ----------------------------------------------------------------------
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* Copyright (C) 2010-2014 ARM Limited. All rights reserved.
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*
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* $Date: 19. March 2015
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* $Revision: V.1.4.5
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*
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* Project: CMSIS DSP Library
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* Title: arm_abs_q15.c
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*
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* Description: Q15 vector absolute value.
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*
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* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of ARM LIMITED nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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* -------------------------------------------------------------------- */
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#include "arm_math.h"
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/**
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* @ingroup groupMath
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*/
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/**
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* @addtogroup BasicAbs
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* @{
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*/
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/**
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* @brief Q15 vector absolute value.
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* @param[in] *pSrc points to the input buffer
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* @param[out] *pDst points to the output buffer
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* @param[in] blockSize number of samples in each vector
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* @return none.
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*
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* <b>Scaling and Overflow Behavior:</b>
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* \par
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* The function uses saturating arithmetic.
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* The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF.
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*/
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void arm_abs_q15(
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q15_t * pSrc,
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q15_t * pDst,
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uint32_t blockSize)
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{
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uint32_t blkCnt; /* loop counter */
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#ifndef ARM_MATH_CM0_FAMILY
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__SIMD32_TYPE *simd;
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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q15_t in1; /* Input value1 */
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q15_t in2; /* Input value2 */
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/*loop Unrolling */
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blkCnt = blockSize >> 2u;
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/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
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** a second loop below computes the remaining 1 to 3 samples. */
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simd = __SIMD32_CONST(pDst);
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while(blkCnt > 0u)
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{
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/* C = |A| */
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/* Read two inputs */
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in1 = *pSrc++;
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in2 = *pSrc++;
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/* Store the Absolute result in the destination buffer by packing the two values, in a single cycle */
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#ifndef ARM_MATH_BIG_ENDIAN
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*simd++ =
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__PKHBT(((in1 > 0) ? in1 : (q15_t)__QSUB16(0, in1)),
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((in2 > 0) ? in2 : (q15_t)__QSUB16(0, in2)), 16);
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#else
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*simd++ =
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__PKHBT(((in2 > 0) ? in2 : (q15_t)__QSUB16(0, in2)),
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((in1 > 0) ? in1 : (q15_t)__QSUB16(0, in1)), 16);
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#endif /* #ifndef ARM_MATH_BIG_ENDIAN */
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in1 = *pSrc++;
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in2 = *pSrc++;
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#ifndef ARM_MATH_BIG_ENDIAN
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*simd++ =
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__PKHBT(((in1 > 0) ? in1 : (q15_t)__QSUB16(0, in1)),
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((in2 > 0) ? in2 : (q15_t)__QSUB16(0, in2)), 16);
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#else
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*simd++ =
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__PKHBT(((in2 > 0) ? in2 : (q15_t)__QSUB16(0, in2)),
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((in1 > 0) ? in1 : (q15_t)__QSUB16(0, in1)), 16);
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#endif /* #ifndef ARM_MATH_BIG_ENDIAN */
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/* Decrement the loop counter */
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blkCnt--;
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}
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pDst = (q15_t *)simd;
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/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
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** No loop unrolling is used. */
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blkCnt = blockSize % 0x4u;
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while(blkCnt > 0u)
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{
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/* C = |A| */
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/* Read the input */
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in1 = *pSrc++;
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/* Calculate absolute value of input and then store the result in the destination buffer. */
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*pDst++ = (in1 > 0) ? in1 : (q15_t)__QSUB16(0, in1);
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/* Decrement the loop counter */
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blkCnt--;
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}
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#else
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/* Run the below code for Cortex-M0 */
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q15_t in; /* Temporary input variable */
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/* Initialize blkCnt with number of samples */
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blkCnt = blockSize;
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while(blkCnt > 0u)
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{
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/* C = |A| */
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/* Read the input */
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in = *pSrc++;
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/* Calculate absolute value of input and then store the result in the destination buffer. */
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*pDst++ = (in > 0) ? in : ((in == (q15_t) 0x8000) ? 0x7fff : -in);
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/* Decrement the loop counter */
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blkCnt--;
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}
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#endif /* #ifndef ARM_MATH_CM0_FAMILY */
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}
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/**
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* @} end of BasicAbs group
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*/
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