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158 lines
4.2 KiB
C
158 lines
4.2 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 f16_to_x
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@{
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*/
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/**
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@brief Converts the elements of the f16 vector to Q15 vector.
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@param[in] pSrc points to the f16 input vector
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@param[out] pDst points to the Q15 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] = (q15_t)(pSrc[n] * 32768); 0 <= n < blockSize.
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</pre>
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@par Scaling and Overflow Behavior
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The function uses saturating arithmetic.
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Results outside of the allowable Q15 range [0x8000 0x7FFF] are saturated.
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@note
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In order to apply rounding in scalar version, the library should be rebuilt with the ROUNDING macro
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defined in the preprocessor section of project options.
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*/
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#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
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void arm_f16_to_q15(
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const float16_t * pSrc,
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q15_t * pDst,
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uint32_t blockSize)
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{
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float16_t maxQ = (float16_t) Q15_MAX;
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float16x8_t vecDst;
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do {
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mve_pred16_t p = vctp16q(blockSize);
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vecDst = vldrhq_z_f16((float16_t const *) pSrc, p);
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/* C = A * 32767 */
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/* convert from float to Q15 and then store the results in the destination buffer */
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vecDst = vmulq_m(vuninitializedq_f16(), vecDst, maxQ, p);
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vstrhq_p_s16(pDst,
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vcvtaq_m(vuninitializedq_s16(), vecDst, p), p);
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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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pSrc += 8;
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pDst += 8;
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blockSize -= 8;
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}
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while ((int32_t) blockSize > 0);
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}
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#else
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void arm_f16_to_q15(
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const float16_t * pSrc,
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q15_t * pDst,
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uint32_t blockSize)
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{
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const float16_t *pIn = pSrc; /* Src pointer */
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uint32_t blkCnt; /* loop counter */
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#ifdef ARM_MATH_ROUNDING
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float16_t in;
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#endif /* #ifdef ARM_MATH_ROUNDING */
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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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#ifdef ARM_MATH_ROUNDING
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/*
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* C = A * 65536
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*/
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/*
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* convert from float to Q31 and then store the results in the destination buffer
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*/
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in = *pIn++;
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in = ((_Float16)in * (_Float16)32768.0f16);
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in += (_Float16)in > 0.0f16 ? 0.5f16 : -0.5f16;
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*pDst++ = clip_q31_to_q15((q31_t) (in));
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#else
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/*
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* C = A * 32768
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*/
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/*
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* convert from float to Q31 and then store the results in the destination buffer
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*/
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*pDst++ = clip_q31_to_q15((q31_t) ((_Float16)*pIn++ * 32768.0f16));
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#endif /* #ifdef ARM_MATH_ROUNDING */
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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 f16_to_x group
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*/
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#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
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