275 lines
14 KiB
C
275 lines
14 KiB
C
/* ----------------------------------------------------------------------
|
|
* Project: CMSIS DSP Library
|
|
* Title: arm_absmax_f16.c
|
|
* Description: Maximum value of a absolute values of a floating-point vector
|
|
*
|
|
* $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/statistics_functions_f16.h"
|
|
|
|
#if defined(ARM_FLOAT16_SUPPORTED)
|
|
|
|
#if (defined(ARM_MATH_NEON) || defined(ARM_MATH_MVEF)) && !defined(ARM_MATH_AUTOVECTORIZE)
|
|
#include <limits.h>
|
|
#endif
|
|
|
|
/**
|
|
@ingroup groupStats
|
|
*/
|
|
|
|
|
|
/**
|
|
@addtogroup AbsMax
|
|
@{
|
|
*/
|
|
|
|
/**
|
|
@brief Maximum value of absolute values of a floating-point vector.
|
|
@param[in] pSrc points to the input vector
|
|
@param[in] blockSize number of samples in input vector
|
|
@param[out] pResult maximum value returned here
|
|
@param[out] pIndex index of maximum value returned here
|
|
@return none
|
|
*/
|
|
|
|
#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
|
|
|
|
#include "arm_helium_utils.h"
|
|
void arm_absmax_f16(
|
|
const float16_t * pSrc,
|
|
uint32_t blockSize,
|
|
float16_t * pResult,
|
|
uint32_t * pIndex)
|
|
{
|
|
uint16_t blkCnt; /* loop counters */
|
|
f16x8_t vecSrc;
|
|
float16_t const *pSrcVec;
|
|
f16x8_t curExtremValVec = vdupq_n_f16(F16_ABSMIN);
|
|
float16_t maxValue = F16_ABSMIN;
|
|
uint16_t idx = blockSize;
|
|
uint16x8_t indexVec;
|
|
uint16x8_t curExtremIdxVec;
|
|
mve_pred16_t p0;
|
|
|
|
|
|
indexVec = vidupq_u16((uint32_t)0, 1);
|
|
curExtremIdxVec = vdupq_n_u16(0);
|
|
|
|
pSrcVec = (float16_t const *) pSrc;
|
|
blkCnt = blockSize >> 3;
|
|
while (blkCnt > 0U)
|
|
{
|
|
vecSrc = vldrhq_f16(pSrcVec);
|
|
pSrcVec += 8;
|
|
vecSrc = vabsq(vecSrc);
|
|
/*
|
|
* Get current max per lane and current index per lane
|
|
* when a max is selected
|
|
*/
|
|
p0 = vcmpgeq(vecSrc, curExtremValVec);
|
|
curExtremValVec = vpselq(vecSrc, curExtremValVec, p0);
|
|
curExtremIdxVec = vpselq(indexVec, curExtremIdxVec, p0);
|
|
|
|
indexVec = indexVec + 8;
|
|
/*
|
|
* Decrement the blockSize loop counter
|
|
*/
|
|
blkCnt--;
|
|
}
|
|
/*
|
|
* tail
|
|
* (will be merged thru tail predication)
|
|
*/
|
|
blkCnt = blockSize & 7;
|
|
if (blkCnt > 0U)
|
|
{
|
|
vecSrc = vldrhq_f16(pSrcVec);
|
|
pSrcVec += 8;
|
|
vecSrc = vabsq(vecSrc);
|
|
|
|
p0 = vctp16q(blkCnt);
|
|
/*
|
|
* Get current max per lane and current index per lane
|
|
* when a max is selected
|
|
*/
|
|
p0 = vcmpgeq_m(vecSrc, curExtremValVec, p0);
|
|
curExtremValVec = vpselq(vecSrc, curExtremValVec, p0);
|
|
curExtremIdxVec = vpselq(indexVec, curExtremIdxVec, p0);
|
|
}
|
|
/*
|
|
* Get max value across the vector
|
|
*/
|
|
maxValue = vmaxnmvq(maxValue, curExtremValVec);
|
|
/*
|
|
* set index for lower values to max possible index
|
|
*/
|
|
p0 = vcmpgeq(curExtremValVec, maxValue);
|
|
indexVec = vpselq(curExtremIdxVec, vdupq_n_u16(blockSize), p0);
|
|
/*
|
|
* Get min index which is thus for a max value
|
|
*/
|
|
idx = vminvq(idx, indexVec);
|
|
/*
|
|
* Save result
|
|
*/
|
|
*pIndex = idx;
|
|
*pResult = maxValue;
|
|
}
|
|
#else
|
|
#if defined(ARM_MATH_LOOPUNROLL)
|
|
void arm_absmax_f16(
|
|
const float16_t * pSrc,
|
|
uint32_t blockSize,
|
|
float16_t * pResult,
|
|
uint32_t * pIndex)
|
|
{
|
|
float16_t cur_absmax, out; /* Temporary variables to store the output value. */\
|
|
uint32_t blkCnt, outIndex; /* Loop counter */ \
|
|
uint32_t index; /* index of maximum value */ \
|
|
\
|
|
/* Initialize index value to zero. */ \
|
|
outIndex = 0U; \
|
|
/* Load first input value that act as reference value for comparision */ \
|
|
out = *pSrc++; \
|
|
out = (out > 0.0f16) ? out : -out; \
|
|
/* Initialize index of extrema value. */ \
|
|
index = 0U; \
|
|
\
|
|
/* Loop unrolling: Compute 4 outputs at a time */ \
|
|
blkCnt = (blockSize - 1U) >> 2U; \
|
|
\
|
|
while (blkCnt > 0U) \
|
|
{ \
|
|
/* Initialize cur_absmax to next consecutive values one by one */ \
|
|
cur_absmax = *pSrc++; \
|
|
cur_absmax = (cur_absmax > 0.0f16) ? cur_absmax : -cur_absmax; \
|
|
/* compare for the extrema value */ \
|
|
if (cur_absmax > out) \
|
|
{ \
|
|
/* Update the extrema value and it's index */ \
|
|
out = cur_absmax; \
|
|
outIndex = index + 1U; \
|
|
} \
|
|
\
|
|
cur_absmax = *pSrc++; \
|
|
cur_absmax = (cur_absmax > 0.0f16) ? cur_absmax : -cur_absmax; \
|
|
if (cur_absmax > out) \
|
|
{ \
|
|
out = cur_absmax; \
|
|
outIndex = index + 2U; \
|
|
} \
|
|
\
|
|
cur_absmax = *pSrc++; \
|
|
cur_absmax = (cur_absmax > 0.0f16) ? cur_absmax : -cur_absmax; \
|
|
if (cur_absmax > out) \
|
|
{ \
|
|
out = cur_absmax; \
|
|
outIndex = index + 3U; \
|
|
} \
|
|
\
|
|
cur_absmax = *pSrc++; \
|
|
cur_absmax = (cur_absmax > 0.0f16) ? cur_absmax : -cur_absmax; \
|
|
if (cur_absmax > out) \
|
|
{ \
|
|
out = cur_absmax; \
|
|
outIndex = index + 4U; \
|
|
} \
|
|
\
|
|
index += 4U; \
|
|
\
|
|
/* Decrement loop counter */ \
|
|
blkCnt--; \
|
|
} \
|
|
\
|
|
/* Loop unrolling: Compute remaining outputs */ \
|
|
blkCnt = (blockSize - 1U) % 4U; \
|
|
\
|
|
\
|
|
while (blkCnt > 0U) \
|
|
{ \
|
|
cur_absmax = *pSrc++; \
|
|
cur_absmax = (cur_absmax > 0.0f16) ? cur_absmax : -cur_absmax; \
|
|
if (cur_absmax > out) \
|
|
{ \
|
|
out = cur_absmax; \
|
|
outIndex = blockSize - blkCnt; \
|
|
} \
|
|
\
|
|
/* Decrement loop counter */ \
|
|
blkCnt--; \
|
|
} \
|
|
\
|
|
/* Store the extrema value and it's index into destination pointers */ \
|
|
*pResult = out; \
|
|
*pIndex = outIndex;
|
|
}
|
|
#else
|
|
void arm_absmax_f16(
|
|
const float16_t * pSrc,
|
|
uint32_t blockSize,
|
|
float16_t * pResult,
|
|
uint32_t * pIndex)
|
|
{
|
|
float16_t maxVal, out; /* Temporary variables to store the output value. */
|
|
uint32_t blkCnt, outIndex; /* Loop counter */
|
|
|
|
/* Initialise index value to zero. */
|
|
outIndex = 0U;
|
|
|
|
/* Load first input value that act as reference value for comparision */
|
|
out = fabsf(*pSrc++);
|
|
|
|
/* Initialize blkCnt with number of samples */
|
|
blkCnt = (blockSize - 1U);
|
|
|
|
while (blkCnt > 0U)
|
|
{
|
|
/* Initialize maxVal to the next consecutive values one by one */
|
|
maxVal = fabsf(*pSrc++);
|
|
|
|
/* compare for the maximum value */
|
|
if (out < maxVal)
|
|
{
|
|
/* Update the maximum value and it's index */
|
|
out = maxVal;
|
|
outIndex = blockSize - blkCnt;
|
|
}
|
|
|
|
/* Decrement loop counter */
|
|
blkCnt--;
|
|
}
|
|
|
|
/* Store the maximum value and it's index into destination pointers */
|
|
*pResult = out;
|
|
*pIndex = outIndex;
|
|
}
|
|
#endif /* defined(ARM_MATH_LOOPUNROLL) */
|
|
#endif /* defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) */
|
|
/**
|
|
@} end of AbsMax group
|
|
*/
|
|
|
|
#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
|
|
|