/* ----------------------------------------------------------------------
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* Copyright (C) 2010-2014 ARM Limited. All rights reserved.
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*
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* $Date: 19. March 2015
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* $Revision: V.1.4.5
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*
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* Project: CMSIS DSP Library
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* Title: arm_cmplx_mult_real_q31.c
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*
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* Description: Q31 complex by real multiplication
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*
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* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of ARM LIMITED nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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* @addtogroup CmplxByRealMult
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* @{
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*/
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/**
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* @brief Q31 complex-by-real multiplication
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* @param[in] *pSrcCmplx points to the complex input vector
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* @param[in] *pSrcReal points to the real input vector
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* @param[out] *pCmplxDst points to the complex output vector
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* @param[in] numSamples number of samples in each vector
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* @return none.
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*
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* <b>Scaling and Overflow Behavior:</b>
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* \par
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* The function uses saturating arithmetic.
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* Results outside of the allowable Q31 range[0x80000000 0x7FFFFFFF] will be saturated.
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*/
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void arm_cmplx_mult_real_q31(
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q31_t * pSrcCmplx,
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q31_t * pSrcReal,
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q31_t * pCmplxDst,
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uint32_t numSamples)
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{
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q31_t inA1; /* Temporary variable to store input value */
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#ifndef ARM_MATH_CM0_FAMILY
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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uint32_t blkCnt; /* loop counters */
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q31_t inA2, inA3, inA4; /* Temporary variables to hold input data */
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q31_t inB1, inB2; /* Temporary variabels to hold input data */
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q31_t out1, out2, out3, out4; /* Temporary variables to hold output data */
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/* loop Unrolling */
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blkCnt = numSamples >> 2u;
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/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
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** a second loop below computes the remaining 1 to 3 samples. */
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while(blkCnt > 0u)
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{
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/* C[2 * i] = A[2 * i] * B[i]. */
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/* C[2 * i + 1] = A[2 * i + 1] * B[i]. */
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/* read real input from complex input buffer */
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inA1 = *pSrcCmplx++;
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inA2 = *pSrcCmplx++;
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/* read input from real input bufer */
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inB1 = *pSrcReal++;
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inB2 = *pSrcReal++;
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/* read imaginary input from complex input buffer */
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inA3 = *pSrcCmplx++;
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inA4 = *pSrcCmplx++;
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/* multiply complex input with real input */
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out1 = ((q63_t) inA1 * inB1) >> 32;
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out2 = ((q63_t) inA2 * inB1) >> 32;
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out3 = ((q63_t) inA3 * inB2) >> 32;
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out4 = ((q63_t) inA4 * inB2) >> 32;
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/* sature the result */
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out1 = __SSAT(out1, 31);
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out2 = __SSAT(out2, 31);
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out3 = __SSAT(out3, 31);
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out4 = __SSAT(out4, 31);
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/* get result in 1.31 format */
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out1 = out1 << 1;
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out2 = out2 << 1;
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out3 = out3 << 1;
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out4 = out4 << 1;
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/* store the result to destination buffer */
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*pCmplxDst++ = out1;
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*pCmplxDst++ = out2;
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*pCmplxDst++ = out3;
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*pCmplxDst++ = out4;
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/* read real input from complex input buffer */
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inA1 = *pSrcCmplx++;
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inA2 = *pSrcCmplx++;
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/* read input from real input bufer */
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inB1 = *pSrcReal++;
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inB2 = *pSrcReal++;
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/* read imaginary input from complex input buffer */
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inA3 = *pSrcCmplx++;
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inA4 = *pSrcCmplx++;
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/* multiply complex input with real input */
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out1 = ((q63_t) inA1 * inB1) >> 32;
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out2 = ((q63_t) inA2 * inB1) >> 32;
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out3 = ((q63_t) inA3 * inB2) >> 32;
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out4 = ((q63_t) inA4 * inB2) >> 32;
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/* sature the result */
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out1 = __SSAT(out1, 31);
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out2 = __SSAT(out2, 31);
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out3 = __SSAT(out3, 31);
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out4 = __SSAT(out4, 31);
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/* get result in 1.31 format */
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out1 = out1 << 1;
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out2 = out2 << 1;
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out3 = out3 << 1;
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out4 = out4 << 1;
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/* store the result to destination buffer */
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*pCmplxDst++ = out1;
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*pCmplxDst++ = out2;
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*pCmplxDst++ = out3;
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*pCmplxDst++ = out4;
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/* Decrement the numSamples loop counter */
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blkCnt--;
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}
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/* If the numSamples is not a multiple of 4, compute any remaining output samples here.
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** No loop unrolling is used. */
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blkCnt = numSamples % 0x4u;
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while(blkCnt > 0u)
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{
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/* C[2 * i] = A[2 * i] * B[i]. */
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/* C[2 * i + 1] = A[2 * i + 1] * B[i]. */
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/* read real input from complex input buffer */
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inA1 = *pSrcCmplx++;
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inA2 = *pSrcCmplx++;
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/* read input from real input bufer */
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inB1 = *pSrcReal++;
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/* multiply complex input with real input */
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out1 = ((q63_t) inA1 * inB1) >> 32;
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out2 = ((q63_t) inA2 * inB1) >> 32;
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/* sature the result */
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out1 = __SSAT(out1, 31);
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out2 = __SSAT(out2, 31);
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/* get result in 1.31 format */
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out1 = out1 << 1;
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out2 = out2 << 1;
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/* store the result to destination buffer */
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*pCmplxDst++ = out1;
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*pCmplxDst++ = out2;
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/* Decrement the numSamples loop counter */
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blkCnt--;
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}
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#else
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/* Run the below code for Cortex-M0 */
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while(numSamples > 0u)
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{
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/* realOut = realA * realB. */
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/* imagReal = imagA * realB. */
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inA1 = *pSrcReal++;
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/* store the result in the destination buffer. */
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*pCmplxDst++ =
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(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * inA1) >> 31);
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*pCmplxDst++ =
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(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * inA1) >> 31);
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/* Decrement the numSamples loop counter */
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numSamples--;
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}
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#endif /* #ifndef ARM_MATH_CM0_FAMILY */
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}
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/**
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* @} end of CmplxByRealMult group
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*/
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