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173 lines
4.3 KiB
C
173 lines
4.3 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_cmplx_dot_prod_f32.c
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* Description: Floating-point complex dot product
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*
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* $Date: 18. March 2019
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* $Revision: V1.6.0
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*
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* Target Processor: Cortex-M cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2019 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 "arm_math.h"
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/**
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@ingroup groupCmplxMath
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*/
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/**
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@defgroup cmplx_dot_prod Complex Dot Product
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Computes the dot product of two complex vectors.
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The vectors are multiplied element-by-element and then summed.
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The <code>pSrcA</code> points to the first complex input vector and
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<code>pSrcB</code> points to the second complex input vector.
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<code>numSamples</code> specifies the number of complex samples
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and the data in each array is stored in an interleaved fashion
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(real, imag, real, imag, ...).
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Each array has a total of <code>2*numSamples</code> values.
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The underlying algorithm is used:
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<pre>
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realResult = 0;
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imagResult = 0;
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for (n = 0; n < numSamples; n++) {
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realResult += pSrcA[(2*n)+0] * pSrcB[(2*n)+0] - pSrcA[(2*n)+1] * pSrcB[(2*n)+1];
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imagResult += pSrcA[(2*n)+0] * pSrcB[(2*n)+1] + pSrcA[(2*n)+1] * pSrcB[(2*n)+0];
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}
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</pre>
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There are separate functions for floating-point, Q15, and Q31 data types.
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*/
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/**
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@addtogroup cmplx_dot_prod
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@{
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*/
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/**
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@brief Floating-point complex dot product.
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@param[in] pSrcA points to the first input vector
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@param[in] pSrcB points to the second input vector
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@param[in] numSamples number of samples in each vector
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@param[out] realResult real part of the result returned here
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@param[out] imagResult imaginary part of the result returned here
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@return none
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*/
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void arm_cmplx_dot_prod_f32(
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const float32_t * pSrcA,
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const float32_t * pSrcB,
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uint32_t numSamples,
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float32_t * realResult,
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float32_t * imagResult)
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{
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uint32_t blkCnt; /* Loop counter */
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float32_t real_sum = 0.0f, imag_sum = 0.0f; /* Temporary result variables */
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float32_t a0,b0,c0,d0;
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#if defined (ARM_MATH_LOOPUNROLL)
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/* Loop unrolling: Compute 4 outputs at a time */
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blkCnt = numSamples >> 2U;
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while (blkCnt > 0U)
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{
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a0 = *pSrcA++;
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b0 = *pSrcA++;
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c0 = *pSrcB++;
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d0 = *pSrcB++;
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real_sum += a0 * c0;
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imag_sum += a0 * d0;
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real_sum -= b0 * d0;
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imag_sum += b0 * c0;
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a0 = *pSrcA++;
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b0 = *pSrcA++;
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c0 = *pSrcB++;
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d0 = *pSrcB++;
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real_sum += a0 * c0;
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imag_sum += a0 * d0;
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real_sum -= b0 * d0;
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imag_sum += b0 * c0;
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a0 = *pSrcA++;
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b0 = *pSrcA++;
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c0 = *pSrcB++;
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d0 = *pSrcB++;
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real_sum += a0 * c0;
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imag_sum += a0 * d0;
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real_sum -= b0 * d0;
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imag_sum += b0 * c0;
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a0 = *pSrcA++;
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b0 = *pSrcA++;
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c0 = *pSrcB++;
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d0 = *pSrcB++;
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real_sum += a0 * c0;
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imag_sum += a0 * d0;
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real_sum -= b0 * d0;
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imag_sum += b0 * c0;
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/* Decrement loop counter */
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blkCnt--;
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}
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/* Loop unrolling: Compute remaining outputs */
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blkCnt = numSamples % 0x4U;
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#else
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/* Initialize blkCnt with number of samples */
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blkCnt = numSamples;
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#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
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while (blkCnt > 0U)
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{
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a0 = *pSrcA++;
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b0 = *pSrcA++;
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c0 = *pSrcB++;
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d0 = *pSrcB++;
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real_sum += a0 * c0;
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imag_sum += a0 * d0;
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real_sum -= b0 * d0;
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imag_sum += b0 * c0;
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/* Decrement loop counter */
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blkCnt--;
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}
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/* Store real and imaginary result in destination buffer. */
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*realResult = real_sum;
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*imagResult = imag_sum;
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}
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/**
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@} end of cmplx_dot_prod group
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*/
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