CMSIS DSP Software Library: arm_cmplx_mag_squared_f32.c Source File

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# arm_cmplx_mag_squared_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_squared_f32.c
    00009 *
    00010 * Description:  Floating-point complex magnitude squared.
    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
    00074 void arm_cmplx_mag_squared_f32(
    00075   float32_t * pSrc,
    00076   float32_t * pDst,
    00077   uint32_t numSamples)
    00078 {
    00079   float32_t real, imag;                          /* Temporary variables to store real and imaginary values */
    00080
    00081 #ifndef ARM_MATH_CM0
    00082
    00083   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00084   uint32_t blkCnt;                               /* loop counter */
    00085
    00086   /*loop Unrolling */
    00087   blkCnt = numSamples >> 2u;
    00088
    00089   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00090    ** a second loop below computes the remaining 1 to 3 samples. */
    00091   while(blkCnt > 0u)
    00092   {
    00093     /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
    00094     real = *pSrc++;
    00095     imag = *pSrc++;
    00096     /* store the result in the destination buffer. */
    00097     *pDst++ = (real * real) + (imag * imag);
    00098
    00099     real = *pSrc++;
    00100     imag = *pSrc++;
    00101     *pDst++ = (real * real) + (imag * imag);
    00102
    00103     real = *pSrc++;
    00104     imag = *pSrc++;
    00105     *pDst++ = (real * real) + (imag * imag);
    00106
    00107     real = *pSrc++;
    00108     imag = *pSrc++;
    00109     *pDst++ = (real * real) + (imag * imag);
    00110
    00111     /* Decrement the loop counter */
    00112     blkCnt--;
    00113   }
    00114
    00115   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00116    ** No loop unrolling is used. */
    00117   blkCnt = numSamples % 0x4u;
    00118
    00119   while(blkCnt > 0u)
    00120   {
    00121     /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
    00122     real = *pSrc++;
    00123     imag = *pSrc++;
    00124     /* store the result in the destination buffer. */
    00125     *pDst++ = (real * real) + (imag * imag);
    00126
    00127     /* Decrement the loop counter */
    00128     blkCnt--;
    00129   }
    00130
    00131 #else
    00132
    00133   /* Run the below code for Cortex-M0 */
    00134
    00135   while(numSamples > 0u)
    00136   {
    00137     /* reading real and imaginary values */
    00138     real = *pSrc++;
    00139     imag = *pSrc++;
    00140
    00141     /* out = (real * real) + (imag * imag) */
    00142     /* store the result in the destination buffer. */
    00143     *pDst++ = (real * real) + (imag * imag);
    00144
    00145     /* Decrement the loop counter */
    00146     numSamples--;
    00147   }
    00148
    00149 #endif /* #ifndef ARM_MATH_CM0 */
    00150
    00151 }
    00152

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