00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 15. July 2011 00005 * $Revision: V1.0.10 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_cmplx_conj_f32.c 00009 * 00010 * Description: Floating-point complex conjugate. 00011 * 00012 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 00013 * 00014 * Version 1.0.10 2011/7/15 00015 * Big Endian support added and Merged M0 and M3/M4 Source code. 00016 * 00017 * Version 1.0.3 2010/11/29 00018 * Re-organized the CMSIS folders and updated documentation. 00019 * 00020 * Version 1.0.2 2010/11/11 00021 * Documentation updated. 00022 * 00023 * Version 1.0.1 2010/10/05 00024 * Production release and review comments incorporated. 00025 * 00026 * Version 1.0.0 2010/09/20 00027 * Production release and review comments incorporated. 00028 * ---------------------------------------------------------------------------- */ 00029 00030 #include "arm_math.h" 00031 00072 void arm_cmplx_conj_f32( 00073 float32_t * pSrc, 00074 float32_t * pDst, 00075 uint32_t numSamples) 00076 { 00077 00078 #ifndef ARM_MATH_CM0 00079 00080 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00081 uint32_t blkCnt; /* loop counter */ 00082 00083 /*loop Unrolling */ 00084 blkCnt = numSamples >> 2u; 00085 00086 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00087 ** a second loop below computes the remaining 1 to 3 samples. */ 00088 while(blkCnt > 0u) 00089 { 00090 /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ 00091 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00092 *pDst++ = *pSrc++; 00093 *pDst++ = -*pSrc++; 00094 *pDst++ = *pSrc++; 00095 *pDst++ = -*pSrc++; 00096 *pDst++ = *pSrc++; 00097 *pDst++ = -*pSrc++; 00098 *pDst++ = *pSrc++; 00099 *pDst++ = -*pSrc++; 00100 00101 /* Decrement the loop counter */ 00102 blkCnt--; 00103 } 00104 00105 /* If the numSamples is not a multiple of 4, compute any remaining output samples here. 00106 ** No loop unrolling is used. */ 00107 blkCnt = numSamples % 0x4u; 00108 00109 while(blkCnt > 0u) 00110 { 00111 /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ 00112 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00113 *pDst++ = *pSrc++; 00114 *pDst++ = -*pSrc++; 00115 00116 /* Decrement the loop counter */ 00117 blkCnt--; 00118 } 00119 00120 #else 00121 00122 /* Run the below code for Cortex-M0 */ 00123 00124 while(numSamples > 0u) 00125 { 00126 /* realOut + j (imagOut) = realIn + j (-1) imagIn */ 00127 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00128 *pDst++ = *pSrc++; 00129 *pDst++ = -*pSrc++; 00130 00131 /* Decrement the loop counter */ 00132 numSamples--; 00133 } 00134 00135 #endif /* #ifndef ARM_MATH_CM0 */ 00136 00137 } 00138