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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_cmplx_mag_q31.c
* Description: Q31 complex magnitude
*
* $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/complex_math_functions.h"
/**
@ingroup groupCmplxMath
*/
/**
@addtogroup cmplx_mag
@{
*/
/**
@brief Q31 complex magnitude.
@param[in] pSrc points to 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 1.31 by 1.31 multiplications and finally output is converted into 2.30 format.
Input down scaling is not required.
*/
#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
#include "arm_helium_utils.h"
void arm_cmplx_mag_q31(
const q31_t * pSrc,
q31_t * pDst,
uint32_t numSamples)
{
int32_t blockSize = numSamples; /* loop counters */
uint32_t blkCnt; /* loop counters */
q31x4x2_t vecSrc;
q31x4_t sum;
q31_t real, imag; /* Temporary input variables */
q31_t acc0, acc1; /* Accumulators */
/* Compute 4 complex samples at a time */
blkCnt = blockSize >> 2;
while (blkCnt > 0U)
{
vecSrc = vld2q(pSrc);
sum = vqaddq(vmulhq(vecSrc.val[0], vecSrc.val[0]),
vmulhq(vecSrc.val[1], vecSrc.val[1]));
sum = vshrq(sum, 1);
/*
This function is using a table. There are compilations flags to avoid
including this table (and in this case, arm_cmplx_maq_q31 must not
be built and linked.)
*/
sum = FAST_VSQRT_Q31(sum);
vst1q(pDst, sum);
/*
* Decrement the blockSize loop counter
*/
blkCnt--;
pSrc += 8;
pDst += 4;
}
/*
* tail
*/
blkCnt = blockSize & 3;
while (blkCnt > 0U)
{
/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
real = *pSrc++;
imag = *pSrc++;
acc0 = (q31_t) (((q63_t) real * real) >> 33);
acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
/* store result in 2.30 format in destination buffer. */
arm_sqrt_q31(acc0 + acc1, pDst++);
/* Decrement loop counter */
blkCnt--;
}
}
#else
void arm_cmplx_mag_q31(
const q31_t * pSrc,
q31_t * pDst,
uint32_t numSamples)
{
uint32_t blkCnt; /* Loop counter */
q31_t real, imag; /* Temporary input variables */
q31_t acc0, acc1; /* Accumulators */
#if defined (ARM_MATH_LOOPUNROLL)
/* Loop unrolling: Compute 4 outputs at a time */
blkCnt = numSamples >> 2U;
while (blkCnt > 0U)
{
/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
real = *pSrc++;
imag = *pSrc++;
acc0 = (q31_t) (((q63_t) real * real) >> 33);
acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
/* store result in 2.30 format in destination buffer. */
arm_sqrt_q31(acc0 + acc1, pDst++);
real = *pSrc++;
imag = *pSrc++;
acc0 = (q31_t) (((q63_t) real * real) >> 33);
acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
arm_sqrt_q31(acc0 + acc1, pDst++);
real = *pSrc++;
imag = *pSrc++;
acc0 = (q31_t) (((q63_t) real * real) >> 33);
acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
arm_sqrt_q31(acc0 + acc1, pDst++);
real = *pSrc++;
imag = *pSrc++;
acc0 = (q31_t) (((q63_t) real * real) >> 33);
acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
arm_sqrt_q31(acc0 + acc1, pDst++);
/* 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[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
real = *pSrc++;
imag = *pSrc++;
acc0 = (q31_t) (((q63_t) real * real) >> 33);
acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
/* store result in 2.30 format in destination buffer. */
arm_sqrt_q31(acc0 + acc1, pDst++);
/* Decrement loop counter */
blkCnt--;
}
}
#endif /* defined(ARM_MATH_MVEI) */
/**
@} end of cmplx_mag group
*/
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