172 lines
4.1 KiB
C
172 lines
4.1 KiB
C
/* ----------------------------------------------------------------------
|
|
* Project: CMSIS DSP Library
|
|
* Title: arm_sub_f16.c
|
|
* Description: Floating-point vector subtraction
|
|
*
|
|
* $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"
|
|
|
|
/**
|
|
@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
|
|
*/
|
|
|
|
#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
|
|
#include "arm_helium_utils.h"
|
|
|
|
void arm_sub_f16(
|
|
const float16_t * pSrcA,
|
|
const float16_t * pSrcB,
|
|
float16_t * pDst,
|
|
uint32_t blockSize)
|
|
{
|
|
uint32_t blkCnt; /* Loop counter */
|
|
|
|
f16x8_t vec1;
|
|
f16x8_t vec2;
|
|
f16x8_t res;
|
|
|
|
/* Compute 4 outputs at a time */
|
|
blkCnt = blockSize >> 3U;
|
|
|
|
while (blkCnt > 0U)
|
|
{
|
|
/* C = A + B */
|
|
|
|
/* Add and then store the results in the destination buffer. */
|
|
vec1 = vld1q(pSrcA);
|
|
vec2 = vld1q(pSrcB);
|
|
res = vsubq(vec1, vec2);
|
|
vst1q(pDst, res);
|
|
|
|
/* Increment pointers */
|
|
pSrcA += 8;
|
|
pSrcB += 8;
|
|
pDst += 8;
|
|
|
|
/* Decrement the loop counter */
|
|
blkCnt--;
|
|
}
|
|
|
|
/* Tail */
|
|
blkCnt = blockSize & 0x7;
|
|
|
|
if (blkCnt > 0U)
|
|
{
|
|
/* C = A + B */
|
|
mve_pred16_t p0 = vctp16q(blkCnt);
|
|
vec1 = vld1q(pSrcA);
|
|
vec2 = vld1q(pSrcB);
|
|
vstrhq_p(pDst, vsubq(vec1,vec2), p0);
|
|
}
|
|
|
|
}
|
|
|
|
#else
|
|
#if defined(ARM_FLOAT16_SUPPORTED)
|
|
void arm_sub_f16(
|
|
const float16_t * pSrcA,
|
|
const float16_t * pSrcB,
|
|
float16_t * pDst,
|
|
uint32_t blockSize)
|
|
{
|
|
uint32_t blkCnt; /* Loop counter */
|
|
|
|
#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 - B */
|
|
|
|
/* Subtract and store result in destination buffer. */
|
|
*pDst++ = (_Float16)(*pSrcA++) - (_Float16)(*pSrcB++);
|
|
|
|
*pDst++ = (_Float16)(*pSrcA++) - (_Float16)(*pSrcB++);
|
|
|
|
*pDst++ = (_Float16)(*pSrcA++) - (_Float16)(*pSrcB++);
|
|
|
|
*pDst++ = (_Float16)(*pSrcA++) - (_Float16)(*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) */
|
|
|
|
while (blkCnt > 0U)
|
|
{
|
|
/* C = A - B */
|
|
|
|
/* Subtract and store result in destination buffer. */
|
|
*pDst++ = (_Float16)(*pSrcA++) - (_Float16)(*pSrcB++);
|
|
|
|
/* Decrement loop counter */
|
|
blkCnt--;
|
|
}
|
|
|
|
}
|
|
#endif
|
|
#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
|
|
|
|
/**
|
|
@} end of BasicSub group
|
|
*/
|