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156 lines
4.0 KiB
C
156 lines
4.0 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_q15_to_float.c
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* Description: Converts the elements of the Q15 vector to floating-point vector
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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/support_functions_f16.h"
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#if defined(ARM_FLOAT16_SUPPORTED)
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/**
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@ingroup groupSupport
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*/
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/**
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* @defgroup q15_to_x Convert 16-bit fixed point value
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*/
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/**
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@addtogroup q15_to_x
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@{
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*/
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/**
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@brief Converts the elements of the Q15 vector to f16 vector.
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@param[in] pSrc points to the Q15 input vector
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@param[out] pDst points to the f16 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 Details
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The equation used for the conversion process is:
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<pre>
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pDst[n] = (float16_t) pSrc[n] / 32768; 0 <= n < blockSize.
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</pre>
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*/
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#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
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void arm_q15_to_f16(
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const q15_t * pSrc,
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float16_t * pDst,
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uint32_t blockSize)
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{
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int32_t blkCnt; /* loop counters */
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q15x8_t vecDst;
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q15_t const *pSrcVec;
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pSrcVec = (q15_t const *) pSrc;
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blkCnt = blockSize >> 3;
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while (blkCnt > 0)
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{
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/* C = (float16_t) A / 32768 */
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/* convert from q15 to float and then store the results in the destination buffer */
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vecDst = vld1q(pSrcVec); pSrcVec += 8;
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vstrhq(pDst, vcvtq_n_f16_s16(vecDst, 15)); pDst += 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 = blockSize & 7;
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if (blkCnt > 0)
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{
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mve_pred16_t p0 = vctp16q(blkCnt);
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vecDst = vld1q(pSrcVec); pSrcVec += 8;
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vstrhq_p(pDst, vcvtq_n_f16_s16(vecDst, 15), p0);
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}
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}
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#else
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void arm_q15_to_f16(
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const q15_t * pSrc,
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float16_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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const q15_t *pIn = pSrc; /* Source pointer */
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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 = (float16_t) A / 32768 */
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/* Convert from q15 to float and store result in destination buffer */
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*pDst++ = ((_Float16) * pIn++ / 32768.0f16);
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*pDst++ = ((_Float16) * pIn++ / 32768.0f16);
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*pDst++ = ((_Float16) * pIn++ / 32768.0f16);
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*pDst++ = ((_Float16) * pIn++ / 32768.0f16);
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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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while (blkCnt > 0U)
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{
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/* C = (float16_t) A / 32768 */
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/* Convert from q15 to float and store result in destination buffer */
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*pDst++ = ((_Float16) *pIn++ / 32768.0f16);
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/* Decrement loop counter */
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blkCnt--;
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}
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}
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#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
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/**
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@} end of q15_to_x group
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*/
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#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
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