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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_sub_f32.c
* Description: Floating-point vector subtraction
*
* $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 groupMath
*/
/**
@defgroup BasicSub Vector Subtraction
Element-by-element subtraction of two vectors.
<pre>
pDst[n] = pSrcA[n] - pSrcB[n], 0 <= n < blockSize.
</pre>
There are separate functions for floating-point, Q7, Q15, and Q31 data types.
*/
/**
@addtogroup BasicSub
@{
*/
/**
@brief Floating-point vector subtraction.
@param[in] pSrcA points to the first input vector
@param[in] pSrcB points to the second input vector
@param[out] pDst points to the output vector
@param[in] blockSize number of samples in each vector
@return none
*/
void arm_sub_f32(
const float32_t * pSrcA,
const float32_t * pSrcB,
float32_t * pDst,
uint32_t blockSize)
{
uint32_t blkCnt; /* Loop counter */
#if defined(ARM_MATH_NEON)
float32x4_t vec1;
float32x4_t vec2;
float32x4_t res;
/* Compute 4 outputs at a time */
blkCnt = blockSize >> 2U;
while (blkCnt > 0U)
{
/* C = A - B */
/* Subtract and then store the results in the destination buffer. */
vec1 = vld1q_f32(pSrcA);
vec2 = vld1q_f32(pSrcB);
res = vsubq_f32(vec1, vec2);
vst1q_f32(pDst, res);
/* Increment pointers */
pSrcA += 4;
pSrcB += 4;
pDst += 4;
/* Decrement the loop counter */
blkCnt--;
}
/* Tail */
blkCnt = blockSize & 0x3;
#else
#if defined (ARM_MATH_LOOPUNROLL)
/* Loop unrolling: Compute 4 outputs at a time */
blkCnt = blockSize >> 2U;
while (blkCnt > 0U)
{
/* C = A - B */
/* Subtract and store result in destination buffer. */
*pDst++ = (*pSrcA++) - (*pSrcB++);
*pDst++ = (*pSrcA++) - (*pSrcB++);
*pDst++ = (*pSrcA++) - (*pSrcB++);
*pDst++ = (*pSrcA++) - (*pSrcB++);
/* 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 - B */
/* Subtract and store result in destination buffer. */
*pDst++ = (*pSrcA++) - (*pSrcB++);
/* Decrement loop counter */
blkCnt--;
}
}
/**
@} end of BasicSub group
*/
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