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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_abs_q7.c
* Description: Q7 vector absolute value
*
* $Date: 23 April 2021
* $Revision: V1.9.0
*
* Target Processor: Cortex-M and Cortex-A cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "dsp/basic_math_functions.h"
/**
@ingroup groupMath
*/
/**
@addtogroup BasicAbs
@{
*/
/**
@brief Q7 vector absolute value.
@param[in] pSrc points to the input vector
@param[out] pDst points to the output vector
@param[in] blockSize number of samples in each vector
@return none
@par Conditions for optimum performance
Input and output buffers should be aligned by 32-bit
@par Scaling and Overflow Behavior
The function uses saturating arithmetic.
The Q7 value -1 (0x80) will be saturated to the maximum allowable positive value 0x7F.
*/
#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
#include "arm_helium_utils.h"
void arm_abs_q7(
const q7_t * pSrc,
q7_t * pDst,
uint32_t blockSize)
{
uint32_t blkCnt; /* loop counters */
q7x16_t vecSrc;
/* Compute 16 outputs at a time */
blkCnt = blockSize >> 4;
while (blkCnt > 0U)
{
/*
* C = |A|
* Calculate absolute and then store the results in the destination buffer.
*/
vecSrc = vld1q(pSrc);
vst1q(pDst, vqabsq(vecSrc));
/*
* Decrement the blockSize loop counter
*/
blkCnt--;
/*
* advance vector source and destination pointers
*/
pSrc += 16;
pDst += 16;
}
/*
* tail
*/
blkCnt = blockSize & 0xF;
if (blkCnt > 0U)
{
mve_pred16_t p0 = vctp8q(blkCnt);
vecSrc = vld1q(pSrc);
vstrbq_p(pDst, vqabsq(vecSrc), p0);
}
}
#else
void arm_abs_q7(
const q7_t * pSrc,
q7_t * pDst,
uint32_t blockSize)
{
uint32_t blkCnt; /* Loop counter */
q7_t in; /* Temporary input variable */
#if defined (ARM_MATH_LOOPUNROLL)
/* Loop unrolling: Compute 4 outputs at a time */
blkCnt = blockSize >> 2U;
while (blkCnt > 0U)
{
/* C = |A| */
/* Calculate absolute of input (if -1 then saturated to 0x7f) and store result in destination buffer. */
in = *pSrc++;
#if defined (ARM_MATH_DSP)
*pDst++ = (in > 0) ? in : (q7_t)__QSUB8(0, in);
#else
*pDst++ = (in > 0) ? in : ((in == (q7_t) 0x80) ? (q7_t) 0x7f : -in);
#endif
in = *pSrc++;
#if defined (ARM_MATH_DSP)
*pDst++ = (in > 0) ? in : (q7_t)__QSUB8(0, in);
#else
*pDst++ = (in > 0) ? in : ((in == (q7_t) 0x80) ? (q7_t) 0x7f : -in);
#endif
in = *pSrc++;
#if defined (ARM_MATH_DSP)
*pDst++ = (in > 0) ? in : (q7_t)__QSUB8(0, in);
#else
*pDst++ = (in > 0) ? in : ((in == (q7_t) 0x80) ? (q7_t) 0x7f : -in);
#endif
in = *pSrc++;
#if defined (ARM_MATH_DSP)
*pDst++ = (in > 0) ? in : (q7_t)__QSUB8(0, in);
#else
*pDst++ = (in > 0) ? in : ((in == (q7_t) 0x80) ? (q7_t) 0x7f : -in);
#endif
/* Decrement loop counter */
blkCnt--;
}
/* Loop unrolling: Compute remaining outputs */
blkCnt = blockSize % 0x4U;
#else
/* Initialize blkCnt with number of samples */
blkCnt = blockSize;
#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
while (blkCnt > 0U)
{
/* C = |A| */
/* Calculate absolute of input (if -1 then saturated to 0x7f) and store result in destination buffer. */
in = *pSrc++;
#if defined (ARM_MATH_DSP)
*pDst++ = (in > 0) ? in : (q7_t) __QSUB8(0, in);
#else
*pDst++ = (in > 0) ? in : ((in == (q7_t) 0x80) ? (q7_t) 0x7f : -in);
#endif
/* Decrement loop counter */
blkCnt--;
}
}
#endif /* defined(ARM_MATH_MVEI) */
/**
@} end of BasicAbs group
*/
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