|
|
/* ----------------------------------------------------------------------
|
|
|
* Copyright (C) 2010 ARM Limited. All rights reserved.
|
|
|
*
|
|
|
* $Date: 29. November 2010
|
|
|
* $Revision: V1.0.3
|
|
|
*
|
|
|
* Project: CMSIS DSP Library
|
|
|
* Title: arm_abs_f32.c
|
|
|
*
|
|
|
* Description: Vector absolute value.
|
|
|
*
|
|
|
* Target Processor: Cortex-M4/Cortex-M3
|
|
|
*
|
|
|
* Version 1.0.3 2010/11/29
|
|
|
* Re-organized the CMSIS folders and updated documentation.
|
|
|
*
|
|
|
* Version 1.0.2 2010/11/11
|
|
|
* Documentation updated.
|
|
|
*
|
|
|
* Version 1.0.1 2010/10/05
|
|
|
* Production release and review comments incorporated.
|
|
|
*
|
|
|
* Version 1.0.0 2010/09/20
|
|
|
* Production release and review comments incorporated.
|
|
|
*
|
|
|
* Version 0.0.7 2010/06/10
|
|
|
* Misra-C changes done
|
|
|
* ---------------------------------------------------------------------------- */
|
|
|
|
|
|
#include "arm_math.h"
|
|
|
#include <math.h>
|
|
|
|
|
|
/**
|
|
|
* @ingroup groupMath
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @defgroup BasicAbs Vector Absolute Value
|
|
|
*
|
|
|
* Computes the absolute value of a vector on an element-by-element basis.
|
|
|
*
|
|
|
* <pre>
|
|
|
* pDst[n] = abs(pSrcA[n]), 0 <= n < blockSize.
|
|
|
* </pre>
|
|
|
*
|
|
|
* The operation can be done in-place by setting the input and output pointers to the same buffer.
|
|
|
* There are separate functions for floating-point, Q7, Q15, and Q31 data types.
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @addtogroup BasicAbs
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Floating-point vector absolute value.
|
|
|
* @param[in] *pSrc points to the input buffer
|
|
|
* @param[out] *pDst points to the output buffer
|
|
|
* @param[in] blockSize number of samples in each vector
|
|
|
* @return none.
|
|
|
*/
|
|
|
|
|
|
void arm_abs_f32(
|
|
|
float32_t * pSrc,
|
|
|
float32_t * pDst,
|
|
|
uint32_t blockSize)
|
|
|
{
|
|
|
uint32_t blkCnt; /* loop counter */
|
|
|
|
|
|
/*loop Unrolling */
|
|
|
blkCnt = blockSize >> 2u;
|
|
|
|
|
|
/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
|
|
|
** a second loop below computes the remaining 1 to 3 samples. */
|
|
|
while(blkCnt > 0u)
|
|
|
{
|
|
|
/* C = |A| */
|
|
|
/* Calculate absolute and then store the results in the destination buffer. */
|
|
|
*pDst++ = fabsf(*pSrc++);
|
|
|
*pDst++ = fabsf(*pSrc++);
|
|
|
*pDst++ = fabsf(*pSrc++);
|
|
|
*pDst++ = fabsf(*pSrc++);
|
|
|
|
|
|
/* Decrement the loop counter */
|
|
|
blkCnt--;
|
|
|
}
|
|
|
|
|
|
/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
|
|
|
** No loop unrolling is used. */
|
|
|
blkCnt = blockSize % 0x4u;
|
|
|
|
|
|
while(blkCnt > 0u)
|
|
|
{
|
|
|
/* C = |A| */
|
|
|
/* Calculate absolute and then store the results in the destination buffer. */
|
|
|
*pDst++ = fabsf(*pSrc++);
|
|
|
|
|
|
/* Decrement the loop counter */
|
|
|
blkCnt--;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @} end of BasicAbs group
|
|
|
*/
|
|
|
|
