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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_abs_f16.c
* Description: Floating-point vector absolute value
*
* $Date: 23 April 2021
* $Revision: V1.9.0
*
* Target Processor: Cortex-M and Cortex-A cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "dsp/basic_math_functions_f16.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(pSrc[n]), 0 <= n < blockSize.
</pre>
The functions support in-place computation allowing the source and
destination pointers to reference the same memory 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 vector
@param[out] pDst points to the output vector
@param[in] blockSize number of samples in each vector
@return none
*/
#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
#include "arm_helium_utils.h"
void arm_abs_f16(
const float16_t * pSrc,
float16_t * pDst,
uint32_t blockSize)
{
uint32_t blkCnt; /* Loop counter */
f16x8_t vec1;
f16x8_t res;
/* Compute 4 outputs at a time */
blkCnt = blockSize >> 3U;
while (blkCnt > 0U)
{
/* C = |A| */
/* Calculate absolute values and then store the results in the destination buffer. */
vec1 = vld1q(pSrc);
res = vabsq(vec1);
vst1q(pDst, res);
/* Increment pointers */
pSrc += 8;
pDst += 8;
/* Decrement the loop counter */
blkCnt--;
}
/* Tail */
blkCnt = blockSize & 0x7;
if (blkCnt > 0U)
{
/* C = |A| */
mve_pred16_t p0 = vctp16q(blkCnt);
vec1 = vld1q(pSrc);
vstrhq_p(pDst, vabsq(vec1), p0);
}
}
#else
#if defined(ARM_FLOAT16_SUPPORTED)
void arm_abs_f16(
const float16_t * pSrc,
float16_t * pDst,
uint32_t blockSize)
{
uint32_t blkCnt; /* Loop counter */
#if defined(ARM_MATH_NEON_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
f16x8_t vec1;
f16x8_t res;
/* Compute 4 outputs at a time */
blkCnt = blockSize >> 2U;
while (blkCnt > 0U)
{
/* C = |A| */
/* Calculate absolute values and then store the results in the destination buffer. */
vec1 = vld1q_f16(pSrc);
res = vabsq_f16(vec1);
vst1q_f16(pDst, res);
/* Increment pointers */
pSrc += 4;
pDst += 4;
/* Decrement the loop counter */
blkCnt--;
}
/* Tail */
blkCnt = blockSize & 0x3;
#else
#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
/* Loop unrolling: Compute 4 outputs at a time */
blkCnt = blockSize >> 2U;
while (blkCnt > 0U)
{
/* C = |A| */
/* Calculate absolute and store result in destination buffer. */
*pDst++ = (_Float16)fabsf((float32_t)*pSrc++);
*pDst++ = (_Float16)fabsf((float32_t)*pSrc++);
*pDst++ = (_Float16)fabsf((float32_t)*pSrc++);
*pDst++ = (_Float16)fabsf((float32_t)*pSrc++);
/* Decrement loop counter */
blkCnt--;
}
/* Loop unrolling: Compute remaining outputs */
blkCnt = blockSize % 0x4U;
#else
/* Initialize blkCnt with number of samples */
blkCnt = blockSize;
#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
#endif /* #if defined(ARM_MATH_NEON) */
while (blkCnt > 0U)
{
/* C = |A| */
/* Calculate absolute and store result in destination buffer. */
*pDst++ = (_Float16)fabsf((float32_t)*pSrc++);
/* Decrement loop counter */
blkCnt--;
}
}
#endif /* defined(ARM_FLOAT16_SUPPORTED */
#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
/**
@} end of BasicAbs group
*/
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