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169 lines
5.3 KiB
169 lines
5.3 KiB
/* ----------------------------------------------------------------------
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* Copyright (C) 2010-2014 ARM Limited. All rights reserved.
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*
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* $Date: 12. March 2014
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* $Revision: V1.4.4
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*
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* Project: CMSIS DSP Library
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* Title: arm_scale_f32.c
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*
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* Description: Multiplies a floating-point vector by a scalar.
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*
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* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of ARM LIMITED nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 scale Vector Scale
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*
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* Multiply a vector by a scalar value. For floating-point data, the algorithm used is:
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*
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* <pre>
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* pDst[n] = pSrc[n] * scale, 0 <= n < blockSize.
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* </pre>
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*
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* In the fixed-point Q7, Q15, and Q31 functions, <code>scale</code> is represented by
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* a fractional multiplication <code>scaleFract</code> and an arithmetic shift <code>shift</code>.
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* The shift allows the gain of the scaling operation to exceed 1.0.
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* The algorithm used with fixed-point data is:
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*
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* <pre>
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* pDst[n] = (pSrc[n] * scaleFract) << shift, 0 <= n < blockSize.
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* </pre>
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*
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* The overall scale factor applied to the fixed-point data is
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* <pre>
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* scale = scaleFract * 2^shift.
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* </pre>
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*
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* The functions support in-place computation allowing the source and destination
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* pointers to reference the same memory buffer.
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*/
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/**
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* @addtogroup scale
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* @{
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*/
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/**
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* @brief Multiplies a floating-point vector by a scalar.
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* @param[in] *pSrc points to the input vector
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* @param[in] scale scale factor to be applied
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* @param[out] *pDst points to the output vector
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* @param[in] blockSize number of samples in the vector
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* @return none.
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*/
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void arm_scale_f32(
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float32_t * pSrc,
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float32_t scale,
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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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#ifndef ARM_MATH_CM0_FAMILY
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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float32_t in1, in2, in3, in4; /* temporary variabels */
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/*loop Unrolling */
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blkCnt = blockSize >> 2u;
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/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
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** a second loop below computes the remaining 1 to 3 samples. */
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while(blkCnt > 0u)
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{
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/* C = A * scale */
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/* Scale the input and then store the results in the destination buffer. */
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/* read input samples from source */
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in1 = *pSrc;
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in2 = *(pSrc + 1);
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/* multiply with scaling factor */
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in1 = in1 * scale;
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/* read input sample from source */
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in3 = *(pSrc + 2);
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/* multiply with scaling factor */
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in2 = in2 * scale;
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/* read input sample from source */
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in4 = *(pSrc + 3);
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/* multiply with scaling factor */
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in3 = in3 * scale;
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in4 = in4 * scale;
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/* store the result to destination */
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*pDst = in1;
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*(pDst + 1) = in2;
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*(pDst + 2) = in3;
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*(pDst + 3) = in4;
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/* update pointers to process next samples */
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pSrc += 4u;
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pDst += 4u;
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
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** No loop unrolling is used. */
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blkCnt = blockSize % 0x4u;
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#else
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/* Run the below code for Cortex-M0 */
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/* Initialize blkCnt with number of samples */
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blkCnt = blockSize;
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#endif /* #ifndef ARM_MATH_CM0_FAMILY */
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while(blkCnt > 0u)
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{
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/* C = A * scale */
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/* Scale the input and then store the result in the destination buffer. */
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*pDst++ = (*pSrc++) * scale;
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/* Decrement the 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 scale group
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*/
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