You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
197 lines
5.4 KiB
C
197 lines
5.4 KiB
C
/* ----------------------------------------------------------------------
|
|
* Project: CMSIS DSP Library
|
|
* Title: arm_cmplx_mult_cmplx_q15.c
|
|
* Description: Q15 complex-by-complex multiplication
|
|
*
|
|
* $Date: 18. March 2019
|
|
* $Revision: V1.6.0
|
|
*
|
|
* Target Processor: Cortex-M cores
|
|
* -------------------------------------------------------------------- */
|
|
/*
|
|
* Copyright (C) 2010-2019 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 groupCmplxMath
|
|
*/
|
|
|
|
/**
|
|
@addtogroup CmplxByCmplxMult
|
|
@{
|
|
*/
|
|
|
|
/**
|
|
@brief Q15 complex-by-complex multiplication.
|
|
@param[in] pSrcA points to first input vector
|
|
@param[in] pSrcB points to second input vector
|
|
@param[out] pDst points to output vector
|
|
@param[in] numSamples number of samples in each vector
|
|
@return none
|
|
|
|
@par Scaling and Overflow Behavior
|
|
The function implements 1.15 by 1.15 multiplications and finally output is converted into 3.13 format.
|
|
*/
|
|
|
|
#if defined(ARM_MATH_MVEI)
|
|
|
|
void arm_cmplx_mult_cmplx_q15(
|
|
const q15_t * pSrcA,
|
|
const q15_t * pSrcB,
|
|
q15_t * pDst,
|
|
uint32_t numSamples)
|
|
{
|
|
uint32_t blkCnt; /* loop counters */
|
|
uint32_t blockSize = numSamples * CMPLX_DIM; /* loop counters */
|
|
q15_t a, b, c, d;
|
|
|
|
q15x8_t vecA;
|
|
q15x8_t vecB;
|
|
q15x8_t vecDst;
|
|
|
|
blkCnt = blockSize >> 3;
|
|
while (blkCnt > 0U)
|
|
{
|
|
vecA = vld1q(pSrcA);
|
|
vecB = vld1q(pSrcB);
|
|
/* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
|
|
vecDst = vqdmlsdhq_s16(vuninitializedq_s16(), vecA, vecB);
|
|
/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
|
|
vecDst = vqdmladhxq_s16(vecDst, vecA, vecB);
|
|
|
|
vecDst = vshrq(vecDst, 2);
|
|
|
|
vst1q(pDst, vecDst);
|
|
|
|
blkCnt --;
|
|
pSrcA += 8;
|
|
pSrcB += 8;
|
|
pDst += 8;
|
|
};
|
|
|
|
/*
|
|
* tail
|
|
*/
|
|
blkCnt = (blockSize & 7) >> 1;
|
|
while (blkCnt > 0U)
|
|
{
|
|
/* C[2 * i ] = A[2 * i] * B[2 * i ] - A[2 * i + 1] * B[2 * i + 1]. */
|
|
/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i ]. */
|
|
|
|
a = *pSrcA++;
|
|
b = *pSrcA++;
|
|
c = *pSrcB++;
|
|
d = *pSrcB++;
|
|
|
|
/* store result in 3.13 format in destination buffer. */
|
|
*pDst++ = (q15_t) ( (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17) );
|
|
*pDst++ = (q15_t) ( (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17) );
|
|
|
|
/* Decrement loop counter */
|
|
blkCnt--;
|
|
}
|
|
}
|
|
#else
|
|
void arm_cmplx_mult_cmplx_q15(
|
|
const q15_t * pSrcA,
|
|
const q15_t * pSrcB,
|
|
q15_t * pDst,
|
|
uint32_t numSamples)
|
|
{
|
|
uint32_t blkCnt; /* Loop counter */
|
|
q15_t a, b, c, d; /* Temporary variables */
|
|
|
|
#if defined (ARM_MATH_LOOPUNROLL)
|
|
|
|
/* Loop unrolling: Compute 4 outputs at a time */
|
|
blkCnt = numSamples >> 2U;
|
|
|
|
while (blkCnt > 0U)
|
|
{
|
|
/* C[2 * i ] = A[2 * i] * B[2 * i ] - A[2 * i + 1] * B[2 * i + 1]. */
|
|
/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i ]. */
|
|
|
|
a = *pSrcA++;
|
|
b = *pSrcA++;
|
|
c = *pSrcB++;
|
|
d = *pSrcB++;
|
|
/* store result in 3.13 format in destination buffer. */
|
|
*pDst++ = (q15_t) ( (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17) );
|
|
*pDst++ = (q15_t) ( (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17) );
|
|
|
|
a = *pSrcA++;
|
|
b = *pSrcA++;
|
|
c = *pSrcB++;
|
|
d = *pSrcB++;
|
|
*pDst++ = (q15_t) ( (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17) );
|
|
*pDst++ = (q15_t) ( (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17) );
|
|
|
|
a = *pSrcA++;
|
|
b = *pSrcA++;
|
|
c = *pSrcB++;
|
|
d = *pSrcB++;
|
|
*pDst++ = (q15_t) ( (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17) );
|
|
*pDst++ = (q15_t) ( (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17) );
|
|
|
|
a = *pSrcA++;
|
|
b = *pSrcA++;
|
|
c = *pSrcB++;
|
|
d = *pSrcB++;
|
|
*pDst++ = (q15_t) ( (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17) );
|
|
*pDst++ = (q15_t) ( (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17) );
|
|
|
|
/* Decrement loop counter */
|
|
blkCnt--;
|
|
}
|
|
|
|
/* Loop unrolling: Compute remaining outputs */
|
|
blkCnt = numSamples % 0x4U;
|
|
|
|
#else
|
|
|
|
/* Initialize blkCnt with number of samples */
|
|
blkCnt = numSamples;
|
|
|
|
#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
|
|
|
|
while (blkCnt > 0U)
|
|
{
|
|
/* C[2 * i ] = A[2 * i] * B[2 * i ] - A[2 * i + 1] * B[2 * i + 1]. */
|
|
/* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i ]. */
|
|
|
|
a = *pSrcA++;
|
|
b = *pSrcA++;
|
|
c = *pSrcB++;
|
|
d = *pSrcB++;
|
|
|
|
/* store result in 3.13 format in destination buffer. */
|
|
*pDst++ = (q15_t) ( (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17) );
|
|
*pDst++ = (q15_t) ( (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17) );
|
|
|
|
/* Decrement loop counter */
|
|
blkCnt--;
|
|
}
|
|
|
|
}
|
|
#endif /* defined(ARM_MATH_MVEI) */
|
|
|
|
/**
|
|
@} end of CmplxByCmplxMult group
|
|
*/
|