Official ARM version: v5.6.0
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rihab kouki
parent
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commit
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2939 changed files with 339304 additions and 113320 deletions
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@ -3,13 +3,13 @@
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* Title: arm_scale_q31.c
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* Description: Multiplies a Q31 vector 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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* $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) 2010-2017 ARM Limited or its affiliates. All rights reserved.
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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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@ -29,199 +29,163 @@
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#include "arm_math.h"
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/**
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* @ingroup groupMath
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@ingroup groupMath
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*/
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/**
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* @addtogroup scale
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* @{
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@addtogroup BasicScale
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@{
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*/
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/**
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* @brief Multiplies a Q31 vector by a scalar.
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* @param[in] *pSrc points to the input vector
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* @param[in] scaleFract fractional portion of the scale value
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* @param[in] shift number of bits to shift the result by
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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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* <b>Scaling and Overflow Behavior:</b>
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* \par
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* The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.31 format.
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* These are multiplied to yield a 2.62 intermediate result and this is shifted with saturation to 1.31 format.
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@brief Multiplies a Q31 vector by a scalar.
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@param[in] pSrc points to the input vector
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@param[in] scaleFract fractional portion of the scale value
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@param[in] shift number of bits to shift the result by
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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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@par Scaling and Overflow Behavior
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The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.31 format.
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These are multiplied to yield a 2.62 intermediate result and this is shifted with saturation to 1.31 format.
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*/
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void arm_scale_q31(
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q31_t * pSrc,
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q31_t scaleFract,
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int8_t shift,
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q31_t * pDst,
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uint32_t blockSize)
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const q31_t *pSrc,
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q31_t scaleFract,
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int8_t shift,
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q31_t *pDst,
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uint32_t blockSize)
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{
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int8_t kShift = shift + 1; /* Shift to apply after scaling */
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int8_t sign = (kShift & 0x80);
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uint32_t blkCnt; /* loop counter */
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q31_t in, out;
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uint32_t blkCnt; /* Loop counter */
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q31_t in, out; /* Temporary variables */
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int8_t kShift = shift + 1; /* Shift to apply after scaling */
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int8_t sign = (kShift & 0x80);
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#if defined (ARM_MATH_DSP)
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#if defined (ARM_MATH_LOOPUNROLL)
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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q31_t in1, in2, in3, in4; /* temporary input variables */
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q31_t out1, out2, out3, out4; /* temporary output variabels */
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/*loop Unrolling */
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/* Loop unrolling: Compute 4 outputs at a time */
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blkCnt = blockSize >> 2U;
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if (sign == 0U)
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{
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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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/* read four inputs from source */
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in1 = *pSrc;
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in2 = *(pSrc + 1);
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in3 = *(pSrc + 2);
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in4 = *(pSrc + 3);
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/* C = A * scale */
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/* multiply input with scaler value */
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in1 = ((q63_t) in1 * scaleFract) >> 32;
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in2 = ((q63_t) in2 * scaleFract) >> 32;
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in3 = ((q63_t) in3 * scaleFract) >> 32;
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in4 = ((q63_t) in4 * scaleFract) >> 32;
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/* Scale input and store result in destination buffer. */
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in = *pSrc++; /* read input from source */
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in = ((q63_t) in * scaleFract) >> 32; /* multiply input with scaler value */
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out = in << kShift; /* apply shifting */
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if (in != (out >> kShift)) /* saturate the result */
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out = 0x7FFFFFFF ^ (in >> 31);
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*pDst++ = out; /* Store result destination */
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/* apply shifting */
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out1 = in1 << kShift;
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out2 = in2 << kShift;
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in = *pSrc++;
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in = ((q63_t) in * scaleFract) >> 32;
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out = in << kShift;
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if (in != (out >> kShift))
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out = 0x7FFFFFFF ^ (in >> 31);
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*pDst++ = out;
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/* saturate the results. */
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if (in1 != (out1 >> kShift))
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out1 = 0x7FFFFFFF ^ (in1 >> 31);
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in = *pSrc++;
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in = ((q63_t) in * scaleFract) >> 32;
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out = in << kShift;
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if (in != (out >> kShift))
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out = 0x7FFFFFFF ^ (in >> 31);
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*pDst++ = out;
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if (in2 != (out2 >> kShift))
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out2 = 0x7FFFFFFF ^ (in2 >> 31);
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in = *pSrc++;
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in = ((q63_t) in * scaleFract) >> 32;
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out = in << kShift;
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if (in != (out >> kShift))
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out = 0x7FFFFFFF ^ (in >> 31);
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*pDst++ = out;
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out3 = in3 << kShift;
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out4 = in4 << kShift;
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*pDst = out1;
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*(pDst + 1) = out2;
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if (in3 != (out3 >> kShift))
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out3 = 0x7FFFFFFF ^ (in3 >> 31);
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if (in4 != (out4 >> kShift))
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out4 = 0x7FFFFFFF ^ (in4 >> 31);
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/* Store result destination */
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*(pDst + 2) = out3;
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*(pDst + 3) = out4;
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/* Update pointers to process next sampels */
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pSrc += 4U;
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pDst += 4U;
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/* Decrement the loop counter */
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/* Decrement loop counter */
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blkCnt--;
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}
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}
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else
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{
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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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/* read four inputs from source */
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in1 = *pSrc;
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in2 = *(pSrc + 1);
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in3 = *(pSrc + 2);
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in4 = *(pSrc + 3);
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/* C = A * scale */
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/* multiply input with scaler value */
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in1 = ((q63_t) in1 * scaleFract) >> 32;
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in2 = ((q63_t) in2 * scaleFract) >> 32;
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in3 = ((q63_t) in3 * scaleFract) >> 32;
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in4 = ((q63_t) in4 * scaleFract) >> 32;
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/* Scale input and store result in destination buffer. */
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in = *pSrc++; /* read four inputs from source */
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in = ((q63_t) in * scaleFract) >> 32; /* multiply input with scaler value */
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out = in >> -kShift; /* apply shifting */
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*pDst++ = out; /* Store result destination */
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/* apply shifting */
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out1 = in1 >> -kShift;
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out2 = in2 >> -kShift;
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in = *pSrc++;
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in = ((q63_t) in * scaleFract) >> 32;
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out = in >> -kShift;
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*pDst++ = out;
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out3 = in3 >> -kShift;
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out4 = in4 >> -kShift;
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in = *pSrc++;
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in = ((q63_t) in * scaleFract) >> 32;
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out = in >> -kShift;
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*pDst++ = out;
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/* Store result destination */
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*pDst = out1;
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*(pDst + 1) = out2;
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in = *pSrc++;
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in = ((q63_t) in * scaleFract) >> 32;
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out = in >> -kShift;
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*pDst++ = out;
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*(pDst + 2) = out3;
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*(pDst + 3) = out4;
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/* Update pointers to process next sampels */
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pSrc += 4U;
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pDst += 4U;
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/* Decrement the loop counter */
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/* Decrement loop counter */
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blkCnt--;
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}
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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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/* Loop unrolling: Compute remaining outputs */
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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 /* #if defined (ARM_MATH_DSP) */
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#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
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if (sign == 0)
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if (sign == 0U)
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{
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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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in = *pSrc++;
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in = ((q63_t) in * scaleFract) >> 32;
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while (blkCnt > 0U)
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{
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/* C = A * scale */
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out = in << kShift;
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/* Scale input and store result in destination buffer. */
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in = *pSrc++;
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in = ((q63_t) in * scaleFract) >> 32;
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out = in << kShift;
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if (in != (out >> kShift))
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out = 0x7FFFFFFF ^ (in >> 31);
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*pDst++ = out;
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if (in != (out >> kShift))
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out = 0x7FFFFFFF ^ (in >> 31);
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*pDst++ = out;
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* Decrement loop counter */
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blkCnt--;
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}
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}
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else
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{
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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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in = *pSrc++;
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in = ((q63_t) in * scaleFract) >> 32;
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while (blkCnt > 0U)
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{
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/* C = A * scale */
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out = in >> -kShift;
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*pDst++ = out;
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* Scale input and store result in destination buffer. */
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in = *pSrc++;
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in = ((q63_t) in * scaleFract) >> 32;
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out = in >> -kShift;
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*pDst++ = out;
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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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/**
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* @} end of scale group
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@} end of BasicScale group
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*/
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