148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_offset_f32.c
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* Description: Floating-point vector offset
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*
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* $Date: 18. March 2019
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* $Revision: V1.6.0
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*
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* Target Processor: Cortex-M cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "arm_math.h"
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/**
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@ingroup groupMath
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*/
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/**
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@defgroup BasicOffset Vector Offset
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Adds a constant offset to each element of a vector.
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<pre>
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pDst[n] = pSrc[n] + offset, 0 <= n < blockSize.
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</pre>
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The functions support in-place computation allowing the source and
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destination pointers to reference the same memory buffer.
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There are separate functions for floating-point, Q7, Q15, and Q31 data types.
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*/
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/**
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@addtogroup BasicOffset
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@{
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*/
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/**
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@brief Adds a constant offset to a floating-point vector.
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@param[in] pSrc points to the input vector
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@param[in] offset is the offset to be added
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@param[out] pDst points to the output vector
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@param[in] blockSize number of samples in each vector
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@return none
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*/
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void arm_offset_f32(
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const float32_t * pSrc,
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float32_t offset,
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float32_t * pDst,
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uint32_t blockSize)
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{
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uint32_t blkCnt; /* Loop counter */
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#if defined(ARM_MATH_NEON_EXPERIMENTAL)
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float32x4_t vec1;
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float32x4_t res;
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/* Compute 4 outputs at a time */
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blkCnt = blockSize >> 2U;
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while (blkCnt > 0U)
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{
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/* C = A + offset */
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/* Add offset and then store the results in the destination buffer. */
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vec1 = vld1q_f32(pSrc);
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res = vaddq_f32(vec1,vdupq_n_f32(offset));
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vst1q_f32(pDst, res);
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/* Increment pointers */
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pSrc += 4;
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pDst += 4;
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* Tail */
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blkCnt = blockSize & 0x3;
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#else
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#if defined (ARM_MATH_LOOPUNROLL)
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/* Loop unrolling: Compute 4 outputs at a time */
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blkCnt = blockSize >> 2U;
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while (blkCnt > 0U)
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{
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/* C = A + offset */
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/* Add offset and store result in destination buffer. */
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*pDst++ = (*pSrc++) + offset;
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*pDst++ = (*pSrc++) + offset;
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*pDst++ = (*pSrc++) + offset;
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*pDst++ = (*pSrc++) + offset;
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/* Decrement loop counter */
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blkCnt--;
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}
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/* Loop unrolling: Compute remaining outputs */
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blkCnt = blockSize % 0x4U;
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#else
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/* Initialize blkCnt with number of samples */
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blkCnt = blockSize;
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#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
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#endif /* #if defined(ARM_MATH_NEON_EXPERIMENTAL) */
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while (blkCnt > 0U)
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{
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/* C = A + offset */
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/* Add offset and store result in destination buffer. */
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*pDst++ = (*pSrc++) + offset;
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/* Decrement loop counter */
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blkCnt--;
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}
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}
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/**
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@} end of BasicOffset group
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*/
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