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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_fill_f32.c
* Description: Fills a constant value into a floating-point vector
*
* $Date: 18. March 2019
* $Revision: V1.6.0
*
* Target Processor: Cortex-M cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2019 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 "arm_math.h"
/**
@ingroup groupSupport
*/
/**
@defgroup Fill Vector Fill
Fills the destination vector with a constant value.
<pre>
pDst[n] = value; 0 <= n < blockSize.
</pre>
There are separate functions for floating point, Q31, Q15, and Q7 data types.
*/
/**
@addtogroup Fill
@{
*/
/**
@brief Fills a constant value into a floating-point vector.
@param[in] value input value to be filled
@param[out] pDst points to output vector
@param[in] blockSize number of samples in each vector
@return none
*/
#if defined(ARM_MATH_NEON_EXPERIMENTAL)
void arm_fill_f32(
float32_t value,
float32_t * pDst,
uint32_t blockSize)
{
uint32_t blkCnt; /* loop counter */
float32x4_t inV = vdupq_n_f32(value);
blkCnt = blockSize >> 2U;
/* Compute 4 outputs at a time.
** a second loop below computes the remaining 1 to 3 samples. */
while (blkCnt > 0U)
{
/* C = value */
/* Fill the value in the destination buffer */
vst1q_f32(pDst, inV);
pDst += 4;
/* 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 & 3;
while (blkCnt > 0U)
{
/* C = value */
/* Fill the value in the destination buffer */
*pDst++ = value;
/* Decrement the loop counter */
blkCnt--;
}
}
#else
void arm_fill_f32(
float32_t value,
float32_t * pDst,
uint32_t blockSize)
{
uint32_t blkCnt; /* Loop counter */
#if defined (ARM_MATH_LOOPUNROLL)
/* Loop unrolling: Compute 4 outputs at a time */
blkCnt = blockSize >> 2U;
while (blkCnt > 0U)
{
/* C = value */
/* Fill value in destination buffer */
*pDst++ = value;
*pDst++ = value;
*pDst++ = value;
*pDst++ = value;
/* 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) */
while (blkCnt > 0U)
{
/* C = value */
/* Fill value in destination buffer */
*pDst++ = value;
/* Decrement loop counter */
blkCnt--;
}
}
#endif /* #if defined(ARM_MATH_NEON) */
/**
@} end of Fill group
*/
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