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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_min_f16.c
* Description: Minimum value 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 Min
@{
*/
/**
@brief Minimum value 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 minimum value returned here
@param[out] pIndex index of minimum value returned here
@return none
*/
#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
void arm_min_f16(
const float16_t * pSrc,
uint32_t blockSize,
float16_t * pResult,
uint32_t * pIndex)
{
int32_t blkCnt; /* loop counters */
f16x8_t vecSrc;
float16_t const *pSrcVec;
f16x8_t curExtremValVec = vdupq_n_f16(F16_MAX);
float16_t minValue = F16_MAX;
uint32_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 > 0)
{
vecSrc = vldrhq_f16(pSrcVec); pSrcVec += 8;
/*
* Get current min per lane and current index per lane
* when a min is selected
*/
p0 = vcmpleq(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 > 0)
{
vecSrc = vldrhq_f16(pSrcVec); pSrcVec += 8;
p0 = vctp16q(blkCnt);
/*
* Get current min per lane and current index per lane
* when a min is selected
*/
p0 = vcmpleq_m(vecSrc, curExtremValVec, p0);
curExtremValVec = vpselq(vecSrc, curExtremValVec, p0);
curExtremIdxVec = vpselq(indexVec, curExtremIdxVec, p0);
}
/*
* Get min value across the vector
*/
minValue = vminnmvq(minValue, curExtremValVec);
/*
* set index for lower values to min possible index
*/
p0 = vcmpleq(curExtremValVec, minValue);
indexVec = vpselq(curExtremIdxVec, vdupq_n_u16(blockSize), p0);
/*
* Get min index which is thus for a min value
*/
idx = vminvq(idx, indexVec);
/*
* Save result
*/
*pIndex = idx;
*pResult = minValue;
}
#else
void arm_min_f16(
const float16_t * pSrc,
uint32_t blockSize,
float16_t * pResult,
uint32_t * pIndex)
{
float16_t minVal, out; /* Temporary variables to store the output value. */
uint32_t blkCnt, outIndex; /* Loop counter */
#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
uint32_t index; /* index of maximum value */
#endif
/* Initialise index value to zero. */
outIndex = 0U;
/* Load first input value that act as reference value for comparision */
out = *pSrc++;
#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
/* Initialise index of maximum value. */
index = 0U;
/* Loop unrolling: Compute 4 outputs at a time */
blkCnt = (blockSize - 1U) >> 2U;
while (blkCnt > 0U)
{
/* Initialize minVal to next consecutive values one by one */
minVal = *pSrc++;
/* compare for the minimum value */
if ((_Float16)out > (_Float16)minVal)
{
/* Update the minimum value and it's index */
out = minVal;
outIndex = index + 1U;
}
minVal = *pSrc++;
if ((_Float16)out > (_Float16)minVal)
{
out = minVal;
outIndex = index + 2U;
}
minVal = *pSrc++;
if ((_Float16)out > (_Float16)minVal)
{
out = minVal;
outIndex = index + 3U;
}
minVal = *pSrc++;
if ((_Float16)out > (_Float16)minVal)
{
out = minVal;
outIndex = index + 4U;
}
index += 4U;
/* Decrement loop counter */
blkCnt--;
}
/* Loop unrolling: Compute remaining outputs */
blkCnt = (blockSize - 1U) % 4U;
#else
/* Initialize blkCnt with number of samples */
blkCnt = (blockSize - 1U);
#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
while (blkCnt > 0U)
{
/* Initialize minVal to the next consecutive values one by one */
minVal = *pSrc++;
/* compare for the minimum value */
if ((_Float16)out > (_Float16)minVal)
{
/* Update the minimum value and it's index */
out = minVal;
outIndex = blockSize - blkCnt;
}
/* Decrement loop counter */
blkCnt--;
}
/* Store the minimum value and it's index into destination pointers */
*pResult = out;
*pIndex = outIndex;
}
#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
/**
@} end of Min group
*/
#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
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