CMSIS DSP Software Library: arm_cmplx_mag_f32.c Source File
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arm_cmplx_mag_f32.c
Go to the documentation of this file.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
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