CMSIS DSP Software Library: arm_cmplx_mag_f32.c Source File

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# arm_cmplx_mag_f32.c

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    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_mag_f32.c
    00009 *
    00010 * Description:  Floating-point complex magnitude.
    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
    00073 void arm_cmplx_mag_f32(
    00074   float32_t * pSrc,
    00075   float32_t * pDst,
    00076   uint32_t numSamples)
    00077 {
    00078   float32_t realIn, imagIn;                      /* Temporary variables to hold input values */
    00079
    00080 #ifndef ARM_MATH_CM0
    00081
    00082   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00083   uint32_t blkCnt;                               /* loop counter */
    00084
    00085   /*loop Unrolling */
    00086   blkCnt = numSamples >> 2u;
    00087
    00088   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00089    ** a second loop below computes the remaining 1 to 3 samples. */
    00090   while(blkCnt > 0u)
    00091   {
    00092
    00093     /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
    00094     realIn = *pSrc++;
    00095     imagIn = *pSrc++;
    00096     /* store the result in the destination buffer. */
    00097     arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
    00098
    00099     realIn = *pSrc++;
    00100     imagIn = *pSrc++;
    00101     arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
    00102
    00103     realIn = *pSrc++;
    00104     imagIn = *pSrc++;
    00105     arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
    00106
    00107     realIn = *pSrc++;
    00108     imagIn = *pSrc++;
    00109     arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
    00110
    00111
    00112     /* Decrement the loop counter */
    00113     blkCnt--;
    00114   }
    00115
    00116   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00117    ** No loop unrolling is used. */
    00118   blkCnt = numSamples % 0x4u;
    00119
    00120   while(blkCnt > 0u)
    00121   {
    00122     /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
    00123     realIn = *pSrc++;
    00124     imagIn = *pSrc++;
    00125     /* store the result in the destination buffer. */
    00126     arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
    00127
    00128     /* Decrement the loop counter */
    00129     blkCnt--;
    00130   }
    00131
    00132 #else
    00133
    00134   /* Run the below code for Cortex-M0 */
    00135
    00136   while(numSamples > 0u)
    00137   {
    00138     /* out = sqrt((real * real) + (imag * imag)) */
    00139     realIn = *pSrc++;
    00140     imagIn = *pSrc++;
    00141     /* store the result in the destination buffer. */
    00142     arm_sqrt_f32((realIn * realIn) + (imagIn * imagIn), pDst++);
    00143
    00144     /* Decrement the loop counter */
    00145     numSamples--;
    00146   }
    00147
    00148 #endif /* #ifndef ARM_MATH_CM0 */
    00149
    00150 }
    00151

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