arm_cmplx_mag_f32.c
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00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 29. November 2010 00005 * $Revision: V1.0.3 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_cmplx_mag_f32.c 00009 * 00010 * Description: Floating-point complex magnitude. 00011 * 00012 * Target Processor: Cortex-M4/Cortex-M3 00013 * 00014 * Version 1.0.3 2010/11/29 00015 * Re-organized the CMSIS folders and updated documentation. 00016 * 00017 * Version 1.0.2 2010/11/11 00018 * Documentation updated. 00019 * 00020 * Version 1.0.1 2010/10/05 00021 * Production release and review comments incorporated. 00022 * 00023 * Version 1.0.0 2010/09/20 00024 * Production release and review comments incorporated. 00025 * ---------------------------------------------------------------------------- */ 00026 00027 #include "arm_math.h" 00028 00070 void arm_cmplx_mag_f32( 00071 float32_t * pSrc, 00072 float32_t * pDst, 00073 uint32_t numSamples) 00074 { 00075 uint32_t blkCnt; /* loop counter */ 00076 float32_t realIn, imagIn; /* Temporary variables to hold input values */ 00077 00078 00079 /*loop Unrolling */ 00080 blkCnt = numSamples >> 2u; 00081 00082 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00083 ** a second loop below computes the remaining 1 to 3 samples. */ 00084 while(blkCnt > 0u) 00085 { 00086 00087 /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */ 00088 realIn = *pSrc++; 00089 imagIn = *pSrc++; 00090 /* store the result in the destination buffer. */ 00091 arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++); 00092 00093 realIn = *pSrc++; 00094 imagIn = *pSrc++; 00095 arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++); 00096 00097 realIn = *pSrc++; 00098 imagIn = *pSrc++; 00099 arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++); 00100 00101 realIn = *pSrc++; 00102 imagIn = *pSrc++; 00103 arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++); 00104 00105 00106 /* Decrement the loop counter */ 00107 blkCnt--; 00108 } 00109 00110 /* If the numSamples is not a multiple of 4, compute any remaining output samples here. 00111 ** No loop unrolling is used. */ 00112 blkCnt = numSamples % 0x4u; 00113 00114 while(blkCnt > 0u) 00115 { 00116 /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */ 00117 realIn = *pSrc++; 00118 imagIn = *pSrc++; 00119 /* store the result in the destination buffer. */ 00120 arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++); 00121 00122 /* Decrement the loop counter */ 00123 blkCnt--; 00124 } 00125 } 00126
