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250 lines
7.6 KiB
C
250 lines
7.6 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_mat_scale_q15.c
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* Description: Multiplies a Q15 matrix by a scalar
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*
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* $Date: 23 April 2021
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* $Revision: V1.9.0
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*
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* Target Processor: Cortex-M and Cortex-A cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2021 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 "dsp/matrix_functions.h"
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/**
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@ingroup groupMatrix
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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 Q15 matrix scaling.
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@param[in] pSrc points to input matrix
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@param[in] scaleFract fractional portion of the scale factor
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@param[in] shift number of bits to shift the result by
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@param[out] pDst points to output matrix structure
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@return execution status
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- \ref ARM_MATH_SUCCESS : Operation successful
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- \ref ARM_MATH_SIZE_MISMATCH : Matrix size check failed
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@par Scaling and Overflow Behavior
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The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.15 format.
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These are multiplied to yield a 2.30 intermediate result and this is shifted with saturation to 1.15 format.
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*/
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#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
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arm_status arm_mat_scale_q15(
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const arm_matrix_instance_q15 * pSrc,
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q15_t scaleFract,
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int32_t shift,
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arm_matrix_instance_q15 * pDst)
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{
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arm_status status; /* Status of matrix scaling */
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q15_t *pIn = pSrc->pData; /* input data matrix pointer */
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q15_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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q15x8_t vecIn, vecOut;
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q15_t const *pInVec;
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int32_t totShift = shift + 1; /* shift to apply after scaling */
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pInVec = (q15_t const *) pIn;
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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) ||
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(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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/*
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* Total number of samples in the input matrix
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*/
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numSamples = (uint32_t) pSrc->numRows * pSrc->numCols;
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blkCnt = numSamples >> 3;
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while (blkCnt > 0U)
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{
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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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*/
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vecIn = vld1q(pInVec); pInVec += 8;
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/* multiply input with scaler value */
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vecOut = vmulhq(vecIn, vdupq_n_s16(scaleFract));
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/* apply shifting */
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vecOut = vqshlq_r(vecOut, totShift);
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vst1q(pOut, vecOut); pOut += 8;
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/*
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* Decrement the blockSize loop counter
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*/
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blkCnt--;
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}
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/*
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* tail
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* (will be merged thru tail predication)
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*/
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blkCnt = numSamples & 7;
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if (blkCnt > 0U)
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{
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mve_pred16_t p0 = vctp16q(blkCnt);
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vecIn = vld1q(pInVec); pInVec += 8;
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vecOut = vmulhq(vecIn, vdupq_n_s16(scaleFract));
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vecOut = vqshlq_r(vecOut, totShift);
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vstrhq_p(pOut, vecOut, p0);
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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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#else
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arm_status arm_mat_scale_q15(
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const arm_matrix_instance_q15 * pSrc,
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q15_t scaleFract,
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int32_t shift,
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arm_matrix_instance_q15 * pDst)
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{
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q15_t *pIn = pSrc->pData; /* Input data matrix pointer */
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q15_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 counter */
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arm_status status; /* Status of matrix scaling */
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int32_t kShift = 15 - shift; /* Total shift to apply after scaling */
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#if defined (ARM_MATH_LOOPUNROLL) && defined (ARM_MATH_DSP)
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q31_t inA1, inA2;
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q31_t out1, out2, out3, out4; /* Temporary output variables */
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q15_t in1, in2, in3, in4; /* Temporary input variables */
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#endif
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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) ||
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(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 input matrix */
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numSamples = (uint32_t) pSrc->numRows * pSrc->numCols;
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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 = numSamples >> 2U;
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while (blkCnt > 0U)
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{
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/* C(m,n) = A(m,n) * k */
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#if defined (ARM_MATH_DSP)
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/* read 2 times 2 samples at a time from source */
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inA1 = read_q15x2_ia (&pIn);
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inA2 = read_q15x2_ia (&pIn);
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/* Scale inputs and store result in temporary variables
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* in single cycle by packing the outputs */
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out1 = (q31_t) ((q15_t) (inA1 >> 16) * scaleFract);
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out2 = (q31_t) ((q15_t) (inA1 ) * scaleFract);
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out3 = (q31_t) ((q15_t) (inA2 >> 16) * scaleFract);
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out4 = (q31_t) ((q15_t) (inA2 ) * scaleFract);
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/* apply shifting */
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out1 = out1 >> kShift;
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out2 = out2 >> kShift;
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out3 = out3 >> kShift;
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out4 = out4 >> kShift;
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/* saturate the output */
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in1 = (q15_t) (__SSAT(out1, 16));
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in2 = (q15_t) (__SSAT(out2, 16));
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in3 = (q15_t) (__SSAT(out3, 16));
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in4 = (q15_t) (__SSAT(out4, 16));
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/* store result to destination */
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write_q15x2_ia (&pOut, __PKHBT(in2, in1, 16));
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write_q15x2_ia (&pOut, __PKHBT(in4, in3, 16));
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#else
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*pOut++ = (q15_t) (__SSAT(((q31_t) (*pIn++) * scaleFract) >> kShift, 16));
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*pOut++ = (q15_t) (__SSAT(((q31_t) (*pIn++) * scaleFract) >> kShift, 16));
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*pOut++ = (q15_t) (__SSAT(((q31_t) (*pIn++) * scaleFract) >> kShift, 16));
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*pOut++ = (q15_t) (__SSAT(((q31_t) (*pIn++) * scaleFract) >> kShift, 16));
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#endif
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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 = numSamples % 0x4U;
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#else
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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_LOOPUNROLL) */
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while (blkCnt > 0U)
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{
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/* C(m,n) = A(m,n) * k */
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/* Scale, saturate and store result in destination buffer. */
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*pOut++ = (q15_t) (__SSAT(((q31_t) (*pIn++) * scaleFract) >> kShift, 16));
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/* Decrement 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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#endif /* defined(ARM_MATH_MVEI) */
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/**
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@} end of MatrixScale group
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*/
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