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_q31.c 00009 * 00010 * Description: Q31 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 00054 void arm_cmplx_conj_q31( 00055 q31_t * pSrc, 00056 q31_t * pDst, 00057 uint32_t numSamples) 00058 { 00059 00060 #ifndef ARM_MATH_CM0 00061 00062 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00063 uint32_t blkCnt; /* loop counter */ 00064 q31_t in; /* Input value */ 00065 00066 /*loop Unrolling */ 00067 blkCnt = numSamples >> 2u; 00068 00069 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00070 ** a second loop below computes the remaining 1 to 3 samples. */ 00071 while(blkCnt > 0u) 00072 { 00073 /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ 00074 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00075 /* Saturated to 0x7fffffff if the input is -1(0x80000000) */ 00076 *pDst++ = *pSrc++; 00077 in = *pSrc++; 00078 *pDst++ = (in == 0x80000000) ? 0x7fffffff : -in; 00079 *pDst++ = *pSrc++; 00080 in = *pSrc++; 00081 *pDst++ = (in == 0x80000000) ? 0x7fffffff : -in; 00082 *pDst++ = *pSrc++; 00083 in = *pSrc++; 00084 *pDst++ = (in == 0x80000000) ? 0x7fffffff : -in; 00085 *pDst++ = *pSrc++; 00086 in = *pSrc++; 00087 *pDst++ = (in == 0x80000000) ? 0x7fffffff : -in; 00088 00089 /* Decrement the loop counter */ 00090 blkCnt--; 00091 } 00092 00093 /* If the numSamples is not a multiple of 4, compute any remaining output samples here. 00094 ** No loop unrolling is used. */ 00095 blkCnt = numSamples % 0x4u; 00096 00097 while(blkCnt > 0u) 00098 { 00099 /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ 00100 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00101 /* Saturated to 0x7fffffff if the input is -1(0x80000000) */ 00102 *pDst++ = *pSrc++; 00103 in = *pSrc++; 00104 *pDst++ = (in == 0x80000000) ? 0x7fffffff : -in; 00105 00106 /* Decrement the loop counter */ 00107 blkCnt--; 00108 } 00109 00110 #else 00111 00112 /* Run the below code for Cortex-M0 */ 00113 00114 while(numSamples > 0u) 00115 { 00116 /* realOut + j (imagOut) = realIn+ j (-1) imagIn */ 00117 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00118 *pDst++ = *pSrc++; 00119 *pDst++ = -*pSrc++; 00120 00121 /* Decrement the loop counter */ 00122 numSamples--; 00123 } 00124 00125 #endif /* #ifndef ARM_MATH_CM0 */ 00126 00127 } 00128