150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_cmplx_conj_q15.c
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* Description: Q15 complex conjugate
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*
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* $Date: 27. January 2017
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* $Revision: V.1.5.1
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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) 2010-2017 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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* @addtogroup cmplx_conj
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* @{
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*/
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/**
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* @brief Q15 complex conjugate.
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* @param *pSrc points to the input vector
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* @param *pDst points to the output vector
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* @param numSamples number of complex 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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* The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF.
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*/
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void arm_cmplx_conj_q15(
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q15_t * pSrc,
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q15_t * pDst,
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uint32_t numSamples)
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{
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#if defined (ARM_MATH_DSP)
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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uint32_t blkCnt; /* loop counter */
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q31_t in1, in2, in3, in4;
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q31_t zero = 0;
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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[0]+jC[1] = A[0]+ j (-1) A[1] */
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/* Calculate Complex Conjugate and then store the results in the destination buffer. */
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in1 = *__SIMD32(pSrc)++;
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in2 = *__SIMD32(pSrc)++;
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in3 = *__SIMD32(pSrc)++;
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in4 = *__SIMD32(pSrc)++;
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#ifndef ARM_MATH_BIG_ENDIAN
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in1 = __QASX(zero, in1);
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in2 = __QASX(zero, in2);
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in3 = __QASX(zero, in3);
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in4 = __QASX(zero, in4);
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#else
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in1 = __QSAX(zero, in1);
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in2 = __QSAX(zero, in2);
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in3 = __QSAX(zero, in3);
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in4 = __QSAX(zero, in4);
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#endif /* #ifndef ARM_MATH_BIG_ENDIAN */
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in1 = ((uint32_t) in1 >> 16) | ((uint32_t) in1 << 16);
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in2 = ((uint32_t) in2 >> 16) | ((uint32_t) in2 << 16);
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in3 = ((uint32_t) in3 >> 16) | ((uint32_t) in3 << 16);
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in4 = ((uint32_t) in4 >> 16) | ((uint32_t) in4 << 16);
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*__SIMD32(pDst)++ = in1;
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*__SIMD32(pDst)++ = in2;
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*__SIMD32(pDst)++ = in3;
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*__SIMD32(pDst)++ = in4;
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/* Decrement the 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[0]+jC[1] = A[0]+ j (-1) A[1] */
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/* Calculate Complex Conjugate and then store the results in the destination buffer. */
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*pDst++ = *pSrc++;
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*pDst++ = __SSAT(-*pSrc++, 16);
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/* Decrement the loop counter */
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blkCnt--;
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}
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#else
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q15_t in;
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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 + j (imagOut) = realIn+ j (-1) imagIn */
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/* Calculate Complex Conjugate and then store the results in the destination buffer. */
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*pDst++ = *pSrc++;
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in = *pSrc++;
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*pDst++ = (in == (q15_t) 0x8000) ? 0x7fff : -in;
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/* Decrement the loop counter */
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numSamples--;
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}
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#endif /* #if defined (ARM_MATH_DSP) */
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}
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/**
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* @} end of cmplx_conj group
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*/
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