- 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