CMSIS DSP Software Library: arm_power_f32.c Source File Main Page Modules Data Structures Files Examples File List Globals arm_power_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_power_f32.c 00009 * 00010 * Description: sum of the square of the elements in a floating point array 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 * Version 0.0.7 2010/06/10 00027 * Misra-C changes done 00028 * ---------------------------------------------------------------------------- */ 00029 00030 #include "arm_math.h" 00031 00065 void arm_power_f32( 00066 float32_t * pSrc, 00067 uint32_t blockSize, 00068 float32_t * pResult) 00069 { 00070 float32_t sum = 0.0f; /* accumulator */ 00071 float32_t in; /* Temporary variable to store input value */ 00072 uint32_t blkCnt; /* loop counter */ 00073 00074 /*loop Unrolling */ 00075 blkCnt = blockSize >> 2u; 00076 00077 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00078 ** a second loop below computes the remaining 1 to 3 samples. */ 00079 while(blkCnt > 0u) 00080 { 00081 /* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */ 00082 /* Compute Power and then store the result in a temporary variable, sum. */ 00083 in = *pSrc++; 00084 sum += in * in; 00085 in = *pSrc++; 00086 sum += in * in; 00087 in = *pSrc++; 00088 sum += in * in; 00089 in = *pSrc++; 00090 sum += in * in; 00091 00092 /* Decrement the loop counter */ 00093 blkCnt--; 00094 } 00095 00096 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00097 ** No loop unrolling is used. */ 00098 blkCnt = blockSize % 0x4u; 00099 00100 while(blkCnt > 0u) 00101 { 00102 /* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */ 00103 /* compute power and then store the result in a temporary variable, sum. */ 00104 in = *pSrc++; 00105 sum += in * in; 00106 00107 /* Decrement the loop counter */ 00108 blkCnt--; 00109 } 00110 00111 /* Store the result to the destination */ 00112 *pResult = sum; 00113 } 00114  All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines Generated on Mon Nov 29 2010 17:19:57 for CMSIS DSP Software Library by  1.7.2

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