CMSIS DSP library
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arm_cmplx_conj_q15.c
00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010-2014 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 19. October 2015 00005 * $Revision: V.1.4.5 a 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_cmplx_conj_q15.c 00009 * 00010 * Description: Q15 complex conjugate. 00011 * 00012 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 00013 * 00014 * Redistribution and use in source and binary forms, with or without 00015 * modification, are permitted provided that the following conditions 00016 * are met: 00017 * - Redistributions of source code must retain the above copyright 00018 * notice, this list of conditions and the following disclaimer. 00019 * - Redistributions in binary form must reproduce the above copyright 00020 * notice, this list of conditions and the following disclaimer in 00021 * the documentation and/or other materials provided with the 00022 * distribution. 00023 * - Neither the name of ARM LIMITED nor the names of its contributors 00024 * may be used to endorse or promote products derived from this 00025 * software without specific prior written permission. 00026 * 00027 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00028 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00029 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 00030 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 00031 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 00032 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 00033 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00034 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 00035 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00036 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 00037 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00038 * POSSIBILITY OF SUCH DAMAGE. 00039 * ---------------------------------------------------------------------------- */ 00040 00041 #include "arm_math.h" 00042 00043 /** 00044 * @ingroup groupCmplxMath 00045 */ 00046 00047 /** 00048 * @addtogroup cmplx_conj 00049 * @{ 00050 */ 00051 00052 /** 00053 * @brief Q15 complex conjugate. 00054 * @param *pSrc points to the input vector 00055 * @param *pDst points to the output vector 00056 * @param numSamples number of complex samples in each vector 00057 * @return none. 00058 * 00059 * <b>Scaling and Overflow Behavior:</b> 00060 * \par 00061 * The function uses saturating arithmetic. 00062 * The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF. 00063 */ 00064 00065 void arm_cmplx_conj_q15( 00066 q15_t * pSrc, 00067 q15_t * pDst, 00068 uint32_t numSamples) 00069 { 00070 00071 #ifndef ARM_MATH_CM0_FAMILY 00072 00073 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00074 uint32_t blkCnt; /* loop counter */ 00075 q31_t in1, in2, in3, in4; 00076 q31_t zero = 0; 00077 00078 /*loop Unrolling */ 00079 blkCnt = numSamples >> 2u; 00080 00081 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00082 ** a second loop below computes the remaining 1 to 3 samples. */ 00083 while(blkCnt > 0u) 00084 { 00085 /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ 00086 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00087 in1 = *__SIMD32(pSrc)++; 00088 in2 = *__SIMD32(pSrc)++; 00089 in3 = *__SIMD32(pSrc)++; 00090 in4 = *__SIMD32(pSrc)++; 00091 00092 #ifndef ARM_MATH_BIG_ENDIAN 00093 00094 in1 = __QASX(zero, in1); 00095 in2 = __QASX(zero, in2); 00096 in3 = __QASX(zero, in3); 00097 in4 = __QASX(zero, in4); 00098 00099 #else 00100 00101 in1 = __QSAX(zero, in1); 00102 in2 = __QSAX(zero, in2); 00103 in3 = __QSAX(zero, in3); 00104 in4 = __QSAX(zero, in4); 00105 00106 #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ 00107 00108 in1 = ((uint32_t) in1 >> 16) | ((uint32_t) in1 << 16); 00109 in2 = ((uint32_t) in2 >> 16) | ((uint32_t) in2 << 16); 00110 in3 = ((uint32_t) in3 >> 16) | ((uint32_t) in3 << 16); 00111 in4 = ((uint32_t) in4 >> 16) | ((uint32_t) in4 << 16); 00112 00113 *__SIMD32(pDst)++ = in1; 00114 *__SIMD32(pDst)++ = in2; 00115 *__SIMD32(pDst)++ = in3; 00116 *__SIMD32(pDst)++ = in4; 00117 00118 /* Decrement the loop counter */ 00119 blkCnt--; 00120 } 00121 00122 /* If the numSamples is not a multiple of 4, compute any remaining output samples here. 00123 ** No loop unrolling is used. */ 00124 blkCnt = numSamples % 0x4u; 00125 00126 while(blkCnt > 0u) 00127 { 00128 /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ 00129 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00130 *pDst++ = *pSrc++; 00131 *pDst++ = __SSAT(-*pSrc++, 16); 00132 00133 /* Decrement the loop counter */ 00134 blkCnt--; 00135 } 00136 00137 #else 00138 00139 q15_t in; 00140 00141 /* Run the below code for Cortex-M0 */ 00142 00143 while(numSamples > 0u) 00144 { 00145 /* realOut + j (imagOut) = realIn+ j (-1) imagIn */ 00146 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00147 *pDst++ = *pSrc++; 00148 in = *pSrc++; 00149 *pDst++ = (in == (q15_t) 0x8000) ? 0x7fff : -in; 00150 00151 /* Decrement the loop counter */ 00152 numSamples--; 00153 } 00154 00155 #endif /* #ifndef ARM_MATH_CM0_FAMILY */ 00156 00157 } 00158 00159 /** 00160 * @} end of cmplx_conj group 00161 */
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