135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
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/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_clip_q31.c
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* Description: Floating-point vector addition
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*
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* $Date: 23 April 2021
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* $Revision: V1.9.0
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*
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* Target Processor: Cortex-M and Cortex-A cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dsp/basic_math_functions.h"
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/**
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@ingroup groupMath
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*/
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/**
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@addtogroup BasicClip
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@{
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*/
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/**
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@brief Elementwise fixed-point clipping
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@param[in] pSrc points to input values
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@param[out] pDst points to output clipped values
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@param[in] low lower bound
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@param[in] high higher bound
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@param[in] numSamples number of samples to clip
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@return none
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*/
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#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
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#include "arm_helium_utils.h"
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void arm_clip_q31(const q31_t * pSrc,
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q31_t * pDst,
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q31_t low,
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q31_t high,
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uint32_t numSamples)
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{
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uint32_t blkCnt;
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q31x4_t curVec0, curVec1;
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q31x4_t vecLow, vecHigh;
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vecLow = vdupq_n_s32(low);
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vecHigh = vdupq_n_s32(high);
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curVec0 = vld1q(pSrc);
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pSrc += 4;
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/*
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* unrolled x 2 to allow
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* vldr/vstr/vmin/vmax
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* stall free interleaving
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*/
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blkCnt = numSamples >> 3;
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while (blkCnt--)
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{
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curVec0 = vmaxq(curVec0, vecLow);
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curVec1 = vld1q(pSrc);
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pSrc += 4;
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curVec0 = vminq(curVec0, vecHigh);
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vst1q(pDst, curVec0);
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pDst += 4;
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curVec1 = vmaxq(curVec1, vecLow);
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curVec0 = vld1q(pSrc);
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pSrc += 4;
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curVec1 = vminq(curVec1, vecHigh);
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vst1q(pDst, curVec1);
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pDst += 4;
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}
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/*
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* Tail handling
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*/
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blkCnt = numSamples - ((numSamples >> 3) << 3);
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if (blkCnt >= 4)
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{
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curVec0 = vmaxq(curVec0, vecLow);
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curVec0 = vminq(curVec0, vecHigh);
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vst1q(pDst, curVec0);
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pDst += 4;
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curVec0 = vld1q(pSrc);
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pSrc += 4;
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}
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if (blkCnt > 0)
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{
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mve_pred16_t p0 = vctp32q(blkCnt & 3);
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curVec0 = vmaxq(curVec0, vecLow);
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curVec0 = vminq(curVec0, vecHigh);
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vstrwq_p(pDst, curVec0, p0);
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}
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}
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#else
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void arm_clip_q31(const q31_t * pSrc,
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q31_t * pDst,
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q31_t low,
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q31_t high,
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uint32_t numSamples)
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{
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uint32_t i;
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for (i = 0; i < numSamples; i++)
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{
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if (pSrc[i] > high)
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pDst[i] = high;
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else if (pSrc[i] < low)
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pDst[i] = low;
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else
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pDst[i] = pSrc[i];
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}
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}
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#endif /* defined(ARM_MATH_MVEI) */
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/**
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@} end of BasicClip group
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*/
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