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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_float_to_q15.c
* Description: Converts the elements of the floating-point vector to Q15 vector
*
* $Date: 23 April 2021
* $Revision: V1.9.0
*
* Target Processor: Cortex-M and Cortex-A cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "dsp/support_functions_f16.h"
#if defined(ARM_FLOAT16_SUPPORTED)
/**
@ingroup groupSupport
*/
/**
@addtogroup float_to_x
@{
*/
/**
@brief Converts the elements of the floating-point vector to f16 vector.
@param[in] pSrc points to the f32 input vector
@param[out] pDst points to the f16 output vector
@param[in] blockSize number of samples in each vector
@return none
*/
#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) && defined(__CMSIS_GCC_H)
#pragma GCC warning "Scalar version of arm_float_to_f16 built. Helium version has build issues with gcc."
#endif
#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) && !defined(__CMSIS_GCC_H)
void arm_float_to_f16(
const float32_t * pSrc,
float16_t * pDst,
uint32_t blockSize)
{
int32_t blkCnt; /* loop counters */
float32x4x2_t tmp;
float16x8_t vecDst;
float32_t const *pSrcVec;
pSrcVec = (float32_t const *) pSrc;
blkCnt = blockSize >> 3;
while (blkCnt > 0)
{
/* convert from float32 to float16 and then store the results in the destination buffer */
tmp = vld2q(pSrcVec); pSrcVec += 8;
/* narrow / merge */
vecDst = vcvtbq_f16_f32(vecDst, tmp.val[0]);
vecDst = vcvttq_f16_f32(vecDst, tmp.val[1]);
vst1q(pDst, vecDst); pDst += 8;
/*
* Decrement the blockSize loop counter
*/
blkCnt--;
}
/*
* tail
*/
blkCnt = blockSize & 7;
if (blkCnt > 0)
{
mve_pred16_t p0 = vctp16q(blkCnt);
tmp = vld2q(pSrcVec);
vecDst = vcvtbq_f16_f32(vecDst, tmp.val[0]);
vecDst = vcvttq_f16_f32(vecDst, tmp.val[1]);
vstrhq_p(pDst, vecDst, p0);
}
}
#else
void arm_float_to_f16(
const float32_t * pSrc,
float16_t * pDst,
uint32_t blockSize)
{
const float32_t *pIn = pSrc; /* Src pointer */
uint32_t blkCnt; /* loop counter */
/*
* Loop over blockSize number of values
*/
blkCnt = blockSize;
while (blkCnt > 0U)
{
*pDst++ = (float16_t) * pIn++;
/*
* Decrement the loop counter
*/
blkCnt--;
}
}
#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
/**
@} end of float_to_x group
*/
#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
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