You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
115 lines
3.3 KiB
115 lines
3.3 KiB
/* ----------------------------------------------------------------------
|
|
* Project: CMSIS DSP Library
|
|
* Title: arm_mult_q7.c
|
|
* Description: Q7 vector multiplication
|
|
*
|
|
* $Date: 27. January 2017
|
|
* $Revision: V.1.5.1
|
|
*
|
|
* Target Processor: Cortex-M cores
|
|
* -------------------------------------------------------------------- */
|
|
/*
|
|
* Copyright (C) 2010-2017 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 "arm_math.h"
|
|
|
|
/**
|
|
* @ingroup groupMath
|
|
*/
|
|
|
|
/**
|
|
* @addtogroup BasicMult
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Q7 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.
|
|
*
|
|
* <b>Scaling and Overflow Behavior:</b>
|
|
* \par
|
|
* The function uses saturating arithmetic.
|
|
* Results outside of the allowable Q7 range [0x80 0x7F] will be saturated.
|
|
*/
|
|
|
|
void arm_mult_q7(
|
|
q7_t * pSrcA,
|
|
q7_t * pSrcB,
|
|
q7_t * pDst,
|
|
uint32_t blockSize)
|
|
{
|
|
uint32_t blkCnt; /* loop counters */
|
|
|
|
#if defined (ARM_MATH_DSP)
|
|
|
|
/* Run the below code for Cortex-M4 and Cortex-M3 */
|
|
q7_t out1, out2, out3, out4; /* Temporary variables to store the product */
|
|
|
|
/* loop Unrolling */
|
|
blkCnt = blockSize >> 2U;
|
|
|
|
/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
|
|
** a second loop below computes the remaining 1 to 3 samples. */
|
|
while (blkCnt > 0U)
|
|
{
|
|
/* C = A * B */
|
|
/* Multiply the inputs and store the results in temporary variables */
|
|
out1 = (q7_t) __SSAT((((q15_t) (*pSrcA++) * (*pSrcB++)) >> 7), 8);
|
|
out2 = (q7_t) __SSAT((((q15_t) (*pSrcA++) * (*pSrcB++)) >> 7), 8);
|
|
out3 = (q7_t) __SSAT((((q15_t) (*pSrcA++) * (*pSrcB++)) >> 7), 8);
|
|
out4 = (q7_t) __SSAT((((q15_t) (*pSrcA++) * (*pSrcB++)) >> 7), 8);
|
|
|
|
/* Store the results of 4 inputs in the destination buffer in single cycle by packing */
|
|
*__SIMD32(pDst)++ = __PACKq7(out1, out2, out3, out4);
|
|
|
|
/* Decrement the blockSize loop counter */
|
|
blkCnt--;
|
|
}
|
|
|
|
/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
|
|
** No loop unrolling is used. */
|
|
blkCnt = blockSize % 0x4U;
|
|
|
|
#else
|
|
|
|
/* Run the below code for Cortex-M0 */
|
|
|
|
/* Initialize blkCnt with number of samples */
|
|
blkCnt = blockSize;
|
|
|
|
#endif /* #if defined (ARM_MATH_DSP) */
|
|
|
|
|
|
while (blkCnt > 0U)
|
|
{
|
|
/* C = A * B */
|
|
/* Multiply the inputs and store the result in the destination buffer */
|
|
*pDst++ = (q7_t) __SSAT((((q15_t) (*pSrcA++) * (*pSrcB++)) >> 7), 8);
|
|
|
|
/* Decrement the blockSize loop counter */
|
|
blkCnt--;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @} end of BasicMult group
|
|
*/
|
|
|