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132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_float_to_q15.c
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* Description: Converts the elements of the floating-point vector to Q15 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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@addtogroup float_to_x
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@{
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*/
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/**
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@brief Converts the elements of the floating-point vector to f16 vector.
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@param[in] pSrc points to the f32 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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*/
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#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) && defined(__CMSIS_GCC_H)
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#pragma GCC warning "Scalar version of arm_float_to_f16 built. Helium version has build issues with gcc."
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#endif
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#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) && !defined(__CMSIS_GCC_H)
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void arm_float_to_f16(
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const float32_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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float32x4x2_t tmp;
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float16x8_t vecDst;
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float32_t const *pSrcVec;
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pSrcVec = (float32_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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/* convert from float32 to float16 and then store the results in the destination buffer */
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tmp = vld2q(pSrcVec); pSrcVec += 8;
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/* narrow / merge */
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vecDst = vcvtbq_f16_f32(vecDst, tmp.val[0]);
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vecDst = vcvttq_f16_f32(vecDst, tmp.val[1]);
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vst1q(pDst, vecDst); 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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*/
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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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tmp = vld2q(pSrcVec);
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vecDst = vcvtbq_f16_f32(vecDst, tmp.val[0]);
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vecDst = vcvttq_f16_f32(vecDst, tmp.val[1]);
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vstrhq_p(pDst, vecDst, p0);
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}
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}
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#else
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void arm_float_to_f16(
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const float32_t * pSrc,
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float16_t * pDst,
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uint32_t blockSize)
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{
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const float32_t *pIn = pSrc; /* Src pointer */
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uint32_t blkCnt; /* loop counter */
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/*
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* Loop over blockSize number of values
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*/
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blkCnt = blockSize;
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while (blkCnt > 0U)
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{
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*pDst++ = (float16_t) * pIn++;
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/*
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* Decrement the loop counter
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*/
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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 float_to_x group
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*/
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#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
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