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165 lines
4.0 KiB
C
165 lines
4.0 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_q7_to_q31.c
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* Description: Converts the elements of the Q7 vector to Q31 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.h"
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/**
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@ingroup groupSupport
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*/
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/**
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@addtogroup q7_to_x
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@{
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*/
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/**
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@brief Converts the elements of the Q7 vector to Q31 vector.
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@param[in] pSrc points to the Q7 input vector
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@param[out] pDst points to the Q31 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] = (q31_t) pSrc[n] << 24; 0 <= n < blockSize.
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</pre>
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*/
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#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
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void arm_q7_to_q31(
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const q7_t * pSrc,
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q31_t * pDst,
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uint32_t blockSize)
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{
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uint32_t blkCnt;
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q31x4_t vecDst;
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blkCnt = blockSize >> 2;
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while (blkCnt > 0U)
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{
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/* C = (q31_t)A << 16 */
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/* convert from q15 to q31 and then store the results in the destination buffer */
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/* load q15 + 32-bit widening */
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vecDst = vldrbq_s32((q7_t const *) pSrc);
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vecDst = vshlq_n(vecDst, 24);
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vstrwq_s32(pDst, vecDst);
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/*
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* Decrement the blockSize loop counter
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* Advance vector source and destination pointers
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*/
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pDst += 4;
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pSrc += 4;
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blkCnt --;
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}
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blkCnt = blockSize & 3;
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while (blkCnt > 0U)
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{
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/* C = (q31_t) A << 24 */
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/* Convert from q7 to q31 and store result in destination buffer */
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*pDst++ = (q31_t) *pSrc++ << 24;
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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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void arm_q7_to_q31(
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const q7_t * pSrc,
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q31_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 q7_t *pIn = pSrc; /* Source pointer */
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#if defined (ARM_MATH_LOOPUNROLL)
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q31_t in;
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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 = (q31_t) A << 24 */
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/* Convert from q7 to q31 and store result in destination buffer */
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in = read_q7x4_ia (&pIn);
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#ifndef ARM_MATH_BIG_ENDIAN
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*pDst++ = (__ROR(in, 8)) & 0xFF000000;
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*pDst++ = (__ROR(in, 16)) & 0xFF000000;
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*pDst++ = (__ROR(in, 24)) & 0xFF000000;
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*pDst++ = (in & 0xFF000000);
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#else
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*pDst++ = (in & 0xFF000000);
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*pDst++ = (__ROR(in, 24)) & 0xFF000000;
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*pDst++ = (__ROR(in, 16)) & 0xFF000000;
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*pDst++ = (__ROR(in, 8)) & 0xFF000000;
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#endif /* #ifndef ARM_MATH_BIG_ENDIAN */
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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 = (q31_t) A << 24 */
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/* Convert from q7 to q31 and store result in destination buffer */
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*pDst++ = (q31_t) * pIn++ << 24;
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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_MVEI) */
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/**
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@} end of q7_to_x group
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*/
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