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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_clip_q31.c
* Description: Floating-point vector addition
*
* $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 BasicClip
@{
*/
/**
@brief Elementwise fixed-point clipping
@param[in] pSrc points to input values
@param[out] pDst points to output clipped values
@param[in] low lower bound
@param[in] high higher bound
@param[in] numSamples number of samples to clip
@return none
*/
#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
#include "arm_helium_utils.h"
void arm_clip_q31(const q31_t * pSrc,
q31_t * pDst,
q31_t low,
q31_t high,
uint32_t numSamples)
{
uint32_t blkCnt;
q31x4_t curVec0, curVec1;
q31x4_t vecLow, vecHigh;
vecLow = vdupq_n_s32(low);
vecHigh = vdupq_n_s32(high);
curVec0 = vld1q(pSrc);
pSrc += 4;
/*
* unrolled x 2 to allow
* vldr/vstr/vmin/vmax
* stall free interleaving
*/
blkCnt = numSamples >> 3;
while (blkCnt--)
{
curVec0 = vmaxq(curVec0, vecLow);
curVec1 = vld1q(pSrc);
pSrc += 4;
curVec0 = vminq(curVec0, vecHigh);
vst1q(pDst, curVec0);
pDst += 4;
curVec1 = vmaxq(curVec1, vecLow);
curVec0 = vld1q(pSrc);
pSrc += 4;
curVec1 = vminq(curVec1, vecHigh);
vst1q(pDst, curVec1);
pDst += 4;
}
/*
* Tail handling
*/
blkCnt = numSamples - ((numSamples >> 3) << 3);
if (blkCnt >= 4)
{
curVec0 = vmaxq(curVec0, vecLow);
curVec0 = vminq(curVec0, vecHigh);
vst1q(pDst, curVec0);
pDst += 4;
curVec0 = vld1q(pSrc);
pSrc += 4;
}
if (blkCnt > 0)
{
mve_pred16_t p0 = vctp32q(blkCnt & 3);
curVec0 = vmaxq(curVec0, vecLow);
curVec0 = vminq(curVec0, vecHigh);
vstrwq_p(pDst, curVec0, p0);
}
}
#else
void arm_clip_q31(const q31_t * pSrc,
q31_t * pDst,
q31_t low,
q31_t high,
uint32_t numSamples)
{
uint32_t i;
for (i = 0; i < numSamples; i++)
{
if (pSrc[i] > high)
pDst[i] = high;
else if (pSrc[i] < low)
pDst[i] = low;
else
pDst[i] = pSrc[i];
}
}
#endif /* defined(ARM_MATH_MVEI) */
/**
@} end of BasicClip group
*/
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