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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_mult_q31.c
* Description: Q31 vector multiplication
*
* $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 BasicMult
@{
*/
/**
@brief Q31 vector multiplication.
@param[in] pSrcA points to the first input vector.
@param[in] pSrcB points to the second input vector.
@param[out] pDst points to the output vector.
@param[in] blockSize number of samples in each vector.
@return none
@par Scaling and Overflow Behavior
The function uses saturating arithmetic.
Results outside of the allowable Q31 range[0x80000000 0x7FFFFFFF] are saturated.
*/
#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
#include "arm_helium_utils.h"
void arm_mult_q31(
const q31_t * pSrcA,
const q31_t * pSrcB,
q31_t * pDst,
uint32_t blockSize)
{
uint32_t blkCnt; /* loop counters */
q31x4_t vecA, vecB;
/* Compute 4 outputs at a time */
blkCnt = blockSize >> 2;
while (blkCnt > 0U)
{
/*
* C = A * B
* Multiply the inputs and then store the results in the destination buffer.
*/
vecA = vld1q(pSrcA);
vecB = vld1q(pSrcB);
vst1q(pDst, vqdmulhq(vecA, vecB));
/*
* Decrement the blockSize loop counter
*/
blkCnt--;
/*
* advance vector source and destination pointers
*/
pSrcA += 4;
pSrcB += 4;
pDst += 4;
}
/*
* tail
*/
blkCnt = blockSize & 3;
if (blkCnt > 0U)
{
mve_pred16_t p0 = vctp32q(blkCnt);
vecA = vld1q(pSrcA);
vecB = vld1q(pSrcB);
vstrwq_p(pDst, vqdmulhq(vecA, vecB), p0);
}
}
#else
void arm_mult_q31(
const q31_t * pSrcA,
const q31_t * pSrcB,
q31_t * pDst,
uint32_t blockSize)
{
uint32_t blkCnt; /* Loop counter */
q31_t out; /* Temporary output variable */
#if defined (ARM_MATH_LOOPUNROLL)
/* Loop unrolling: Compute 4 outputs at a time */
blkCnt = blockSize >> 2U;
while (blkCnt > 0U)
{
/* C = A * B */
/* Multiply inputs and store result in destination buffer. */
out = ((q63_t) *pSrcA++ * *pSrcB++) >> 32;
out = __SSAT(out, 31);
*pDst++ = out << 1U;
out = ((q63_t) *pSrcA++ * *pSrcB++) >> 32;
out = __SSAT(out, 31);
*pDst++ = out << 1U;
out = ((q63_t) *pSrcA++ * *pSrcB++) >> 32;
out = __SSAT(out, 31);
*pDst++ = out << 1U;
out = ((q63_t) *pSrcA++ * *pSrcB++) >> 32;
out = __SSAT(out, 31);
*pDst++ = out << 1U;
/* 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 * B */
/* Multiply inputs and store result in destination buffer. */
out = ((q63_t) *pSrcA++ * *pSrcB++) >> 32;
out = __SSAT(out, 31);
*pDst++ = out << 1U;
/* Decrement loop counter */
blkCnt--;
}
}
#endif /* defined(ARM_MATH_MVEI) */
/**
@} end of BasicMult group
*/
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