CMSIS DSP Software Library: arm_abs_f32.c Source File Main Page Modules Data Structures Files Examples File List Globals arm_abs_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_abs_f32.c 00009 * 00010 * Description: Vector absolute value. 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 #include <math.h> 00032 00063 void arm_abs_f32( 00064 float32_t * pSrc, 00065 float32_t * pDst, 00066 uint32_t blockSize) 00067 { 00068 uint32_t blkCnt; /* loop counter */ 00069 00070 /*loop Unrolling */ 00071 blkCnt = blockSize >> 2u; 00072 00073 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00074 ** a second loop below computes the remaining 1 to 3 samples. */ 00075 while(blkCnt > 0u) 00076 { 00077 /* C = |A| */ 00078 /* Calculate absolute and then store the results in the destination buffer. */ 00079 *pDst++ = fabsf(*pSrc++); 00080 *pDst++ = fabsf(*pSrc++); 00081 *pDst++ = fabsf(*pSrc++); 00082 *pDst++ = fabsf(*pSrc++); 00083 00084 /* Decrement the loop counter */ 00085 blkCnt--; 00086 } 00087 00088 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00089 ** No loop unrolling is used. */ 00090 blkCnt = blockSize % 0x4u; 00091 00092 while(blkCnt > 0u) 00093 { 00094 /* C = |A| */ 00095 /* Calculate absolute and then store the results in the destination buffer. */ 00096 *pDst++ = fabsf(*pSrc++); 00097 00098 /* Decrement the loop counter */ 00099 blkCnt--; 00100 } 00101 } 00102  All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines Generated on Mon Nov 29 2010 17:19:55 for CMSIS DSP Software Library by  1.7.2

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