170 lines
4.9 KiB
C
170 lines
4.9 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_mat_scale_f32.c
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* Description: Multiplies a floating-point matrix by a scalar
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*
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* $Date: 27. January 2017
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* $Revision: V.1.5.1
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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) 2010-2017 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 groupMatrix
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*/
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/**
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* @defgroup MatrixScale Matrix Scale
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*
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* Multiplies a matrix by a scalar. This is accomplished by multiplying each element in the
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* matrix by the scalar. For example:
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* \image html MatrixScale.gif "Matrix Scaling of a 3 x 3 matrix"
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*
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* The function checks to make sure that the input and output matrices are of the same size.
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*
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* In the fixed-point 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 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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/**
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* @addtogroup MatrixScale
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* @{
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*/
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/**
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* @brief Floating-point matrix scaling.
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* @param[in] *pSrc points to input matrix structure
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* @param[in] scale scale factor to be applied
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* @param[out] *pDst points to output matrix structure
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* @return The function returns either <code>ARM_MATH_SIZE_MISMATCH</code>
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* or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.
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*
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*/
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arm_status arm_mat_scale_f32(
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const arm_matrix_instance_f32 * pSrc,
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float32_t scale,
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arm_matrix_instance_f32 * pDst)
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{
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float32_t *pIn = pSrc->pData; /* input data matrix pointer */
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float32_t *pOut = pDst->pData; /* output data matrix pointer */
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uint32_t numSamples; /* total number of elements in the matrix */
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uint32_t blkCnt; /* loop counters */
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arm_status status; /* status of matrix scaling */
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#if defined (ARM_MATH_DSP)
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float32_t in1, in2, in3, in4; /* temporary variables */
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float32_t out1, out2, out3, out4; /* temporary variables */
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#endif // #if defined (ARM_MATH_DSP)
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#ifdef ARM_MATH_MATRIX_CHECK
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/* Check for matrix mismatch condition */
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if ((pSrc->numRows != pDst->numRows) || (pSrc->numCols != pDst->numCols))
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{
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/* Set status as ARM_MATH_SIZE_MISMATCH */
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status = ARM_MATH_SIZE_MISMATCH;
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}
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else
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#endif /* #ifdef ARM_MATH_MATRIX_CHECK */
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{
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/* Total number of samples in the input matrix */
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numSamples = (uint32_t) pSrc->numRows * pSrc->numCols;
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#if defined (ARM_MATH_DSP)
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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/* Loop Unrolling */
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blkCnt = numSamples >> 2;
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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(m,n) = A(m,n) * scale */
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/* Scaling and results are stored in the destination buffer. */
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in1 = pIn[0];
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in2 = pIn[1];
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in3 = pIn[2];
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in4 = pIn[3];
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out1 = in1 * scale;
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out2 = in2 * scale;
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out3 = in3 * scale;
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out4 = in4 * scale;
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pOut[0] = out1;
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pOut[1] = out2;
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pOut[2] = out3;
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pOut[3] = out4;
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/* update pointers to process next sampels */
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pIn += 4U;
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pOut += 4U;
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/* Decrement the numSamples loop counter */
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blkCnt--;
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}
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/* If the numSamples 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 = numSamples % 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 = numSamples;
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#endif /* #if defined (ARM_MATH_DSP) */
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while (blkCnt > 0U)
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{
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/* C(m,n) = A(m,n) * scale */
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/* The results are stored in the destination buffer. */
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*pOut++ = (*pIn++) * scale;
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* Set status as ARM_MATH_SUCCESS */
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status = ARM_MATH_SUCCESS;
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}
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/* Return to application */
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return (status);
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}
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/**
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* @} end of MatrixScale group
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*/
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