Official ARM version: v5.6.0
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rihab kouki
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2939 changed files with 339304 additions and 113320 deletions
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@ -3,13 +3,13 @@
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* Title: arm_abs_f32.c
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* Description: Floating-point vector absolute value
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*
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* $Date: 27. January 2017
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* $Revision: V.1.5.1
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* $Date: 18. March 2019
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* $Revision: V1.6.0
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*
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* Target Processor: Cortex-M cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
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* Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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@ -30,124 +30,117 @@
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#include <math.h>
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/**
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* @ingroup groupMath
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@ingroup groupMath
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*/
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/**
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* @defgroup BasicAbs Vector Absolute Value
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*
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* Computes the absolute value of a vector on an element-by-element basis.
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*
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* <pre>
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* pDst[n] = abs(pSrc[n]), 0 <= n < blockSize.
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* </pre>
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*
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* The functions support in-place computation allowing the source and
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* destination pointers to reference the same memory buffer.
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* There are separate functions for floating-point, Q7, Q15, and Q31 data types.
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@defgroup BasicAbs Vector Absolute Value
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Computes the absolute value of a vector on an element-by-element basis.
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<pre>
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pDst[n] = abs(pSrc[n]), 0 <= n < blockSize.
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</pre>
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The functions support in-place computation allowing the source and
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destination pointers to reference the same memory buffer.
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There are separate functions for floating-point, Q7, Q15, and Q31 data types.
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*/
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/**
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* @addtogroup BasicAbs
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* @{
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@addtogroup BasicAbs
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@{
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*/
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/**
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* @brief Floating-point vector absolute value.
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* @param[in] *pSrc points to the input buffer
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* @param[out] *pDst points to the output buffer
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* @param[in] blockSize number of samples in each vector
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* @return none.
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@brief Floating-point vector absolute value.
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@param[in] pSrc points to the input vector
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@param[out] pDst points to the output vector
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@param[in] blockSize number of samples in each vector
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@return none
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*/
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void arm_abs_f32(
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float32_t * pSrc,
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float32_t * pDst,
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uint32_t blockSize)
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const float32_t * pSrc,
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float32_t * pDst,
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uint32_t blockSize)
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{
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uint32_t blkCnt; /* loop counter */
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uint32_t blkCnt; /* Loop counter */
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#if defined (ARM_MATH_DSP)
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#if defined(ARM_MATH_NEON)
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float32x4_t vec1;
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float32x4_t res;
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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float32_t in1, in2, in3, in4; /* temporary variables */
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/* Compute 4 outputs at a time */
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blkCnt = blockSize >> 2U;
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/*loop Unrolling */
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while (blkCnt > 0U)
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{
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/* C = |A| */
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/* Calculate absolute values and then store the results in the destination buffer. */
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vec1 = vld1q_f32(pSrc);
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res = vabsq_f32(vec1);
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vst1q_f32(pDst, res);
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/* Increment pointers */
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pSrc += 4;
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pDst += 4;
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* Tail */
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blkCnt = blockSize & 0x3;
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#else
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#if defined (ARM_MATH_LOOPUNROLL)
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/* Loop unrolling: Compute 4 outputs at a time */
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blkCnt = blockSize >> 2U;
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/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
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** a second loop below computes the remaining 1 to 3 samples. */
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while (blkCnt > 0U)
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{
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/* C = |A| */
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/* Calculate absolute and then store the results in the destination buffer. */
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/* read sample from source */
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in1 = *pSrc;
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in2 = *(pSrc + 1);
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in3 = *(pSrc + 2);
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/* find absolute value */
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in1 = fabsf(in1);
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/* Calculate absolute and store result in destination buffer. */
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*pDst++ = fabsf(*pSrc++);
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/* read sample from source */
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in4 = *(pSrc + 3);
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*pDst++ = fabsf(*pSrc++);
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/* find absolute value */
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in2 = fabsf(in2);
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*pDst++ = fabsf(*pSrc++);
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/* read sample from source */
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*pDst = in1;
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*pDst++ = fabsf(*pSrc++);
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/* find absolute value */
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in3 = fabsf(in3);
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/* find absolute value */
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in4 = fabsf(in4);
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/* store result to destination */
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*(pDst + 1) = in2;
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/* store result to destination */
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*(pDst + 2) = in3;
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/* store result to destination */
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*(pDst + 3) = in4;
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/* Update source pointer to process next sampels */
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pSrc += 4U;
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/* Update destination pointer to process next sampels */
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pDst += 4U;
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/* Decrement the loop counter */
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/* Decrement loop counter */
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blkCnt--;
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}
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/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
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** No loop unrolling is used. */
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/* Loop unrolling: Compute remaining outputs */
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blkCnt = blockSize % 0x4U;
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#else
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/* Run the below code for Cortex-M0 */
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/* Initialize blkCnt with number of samples */
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blkCnt = blockSize;
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#endif /* #if defined (ARM_MATH_DSP) */
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#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
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#endif /* #if defined(ARM_MATH_NEON) */
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while (blkCnt > 0U)
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{
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/* C = |A| */
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/* Calculate absolute and then store the results in the destination buffer. */
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/* Calculate absolute and store result in destination buffer. */
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*pDst++ = fabsf(*pSrc++);
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/* Decrement the loop counter */
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/* Decrement loop counter */
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blkCnt--;
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}
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}
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/**
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* @} end of BasicAbs group
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@} end of BasicAbs group
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*/
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