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CMSIS/DSP/Source/SupportFunctions/arm_float_to_q7.c
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330
CMSIS/DSP/Source/SupportFunctions/arm_float_to_q7.c
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/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_float_to_q7.c
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* Description: Converts the elements of the floating-point vector to Q7 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 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 Q7 vector.
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* @param[in] *pSrc points to the floating-point input vector
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* @param[out] *pDst points to the Q7 output vector
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* @param[in] blockSize length of the input vector
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* @return none.
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*
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*\par Description:
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* \par
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* The equation used for the conversion process is:
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* <pre>
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* pDst[n] = (q7_t)(pSrc[n] * 128); 0 <= n < blockSize.
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* </pre>
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* \par Scaling and Overflow Behavior:
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* \par
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* The function uses saturating arithmetic.
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* Results outside of the allowable Q7 range [0x80 0x7F] will be saturated.
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* \note
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* In order to apply rounding, 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_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
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void arm_float_to_q7(
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const float32_t * pSrc,
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q7_t * pDst,
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uint32_t blockSize)
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{
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uint32_t blkCnt; /* loop counters */
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float32_t maxQ = powf(2.0, 7);
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f32x4x4_t tmp;
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q15x8_t evVec = { 0 }, oddVec = { 0 };
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q7x16_t vecDst = { 0 };
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float32_t const *pSrcVec;
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#ifdef ARM_MATH_ROUNDING
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float32_t in;
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#endif
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pSrcVec = (float32_t const *) pSrc;
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blkCnt = blockSize >> 4;
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while (blkCnt > 0U) {
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tmp = vld4q(pSrcVec);
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pSrcVec += 16;
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/*
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* C = A * 128.0
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* convert from float to q7 and then store the results in the destination buffer
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*/
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tmp.val[0] = vmulq(tmp.val[0], maxQ);
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tmp.val[1] = vmulq(tmp.val[1], maxQ);
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tmp.val[2] = vmulq(tmp.val[2], maxQ);
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tmp.val[3] = vmulq(tmp.val[3], maxQ);
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/*
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* convert and pack evens
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*/
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evVec = vqmovnbq(evVec, vcvtaq_s32_f32(tmp.val[0]));
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evVec = vqmovntq(evVec, vcvtaq_s32_f32(tmp.val[2]));
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/*
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* convert and pack odds
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*/
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oddVec = vqmovnbq(oddVec, vcvtaq_s32_f32(tmp.val[1]));
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oddVec = vqmovntq(oddVec, vcvtaq_s32_f32(tmp.val[3]));
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/*
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* merge
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*/
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vecDst = vqmovnbq(vecDst, evVec);
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vecDst = vqmovntq(vecDst, oddVec);
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vst1q(pDst, vecDst);
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pDst += 16;
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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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blkCnt = blockSize & 0xF;
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while (blkCnt > 0U)
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{
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/* C = A * 128 */
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/* Convert from float to q7 and store result in destination buffer */
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#ifdef ARM_MATH_ROUNDING
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in = (*pSrcVec++ * 128);
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in += in > 0.0f ? 0.5f : -0.5f;
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*pDst++ = (q7_t) (__SSAT((q15_t) (in), 8));
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#else
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*pDst++ = (q7_t) __SSAT((q31_t) (*pSrcVec++ * 128.0f), 8);
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#endif /* #ifdef ARM_MATH_ROUNDING */
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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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#if defined(ARM_MATH_NEON)
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void arm_float_to_q7(
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const float32_t * pSrc,
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q7_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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float32x4_t inV;
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#ifdef ARM_MATH_ROUNDING
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float32_t in;
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float32x4_t zeroV = vdupq_n_f32(0.0f);
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float32x4_t pHalf = vdupq_n_f32(0.5f / 128.0f);
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float32x4_t mHalf = vdupq_n_f32(-0.5f / 128.0f);
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float32x4_t r;
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uint32x4_t cmp;
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#endif
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int16x4_t cvt1,cvt2;
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int8x8_t outV;
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blkCnt = blockSize >> 3U;
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/* Compute 8 outputs at a time.
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** a second loop below computes the remaining 1 to 7 samples. */
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while (blkCnt > 0U)
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{
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#ifdef ARM_MATH_ROUNDING
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/* C = A * 128 */
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/* Convert from float to q7 and then store the results in the destination buffer */
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inV = vld1q_f32(pIn);
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cmp = vcgtq_f32(inV,zeroV);
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r = vbslq_f32(cmp,pHalf,mHalf);
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inV = vaddq_f32(inV, r);
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cvt1 = vqmovn_s32(vcvtq_n_s32_f32(inV,7));
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pIn += 4;
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inV = vld1q_f32(pIn);
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cmp = vcgtq_f32(inV,zeroV);
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r = vbslq_f32(cmp,pHalf,mHalf);
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inV = vaddq_f32(inV, r);
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cvt2 = vqmovn_s32(vcvtq_n_s32_f32(inV,7));
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pIn += 4;
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outV = vqmovn_s16(vcombine_s16(cvt1,cvt2));
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vst1_s8(pDst, outV);
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pDst += 8;
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#else
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/* C = A * 128 */
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/* Convert from float to q7 and then store the results in the destination buffer */
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inV = vld1q_f32(pIn);
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cvt1 = vqmovn_s32(vcvtq_n_s32_f32(inV,7));
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pIn += 4;
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inV = vld1q_f32(pIn);
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cvt2 = vqmovn_s32(vcvtq_n_s32_f32(inV,7));
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pIn += 4;
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outV = vqmovn_s16(vcombine_s16(cvt1,cvt2));
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vst1_s8(pDst, outV);
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pDst += 8;
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#endif /* #ifdef ARM_MATH_ROUNDING */
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* If the blockSize is not a multiple of 4, compute any remaining output samples here.
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** No loop unrolling is used. */
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blkCnt = blockSize & 7;
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while (blkCnt > 0U)
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{
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#ifdef ARM_MATH_ROUNDING
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/* C = A * 128 */
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/* Convert from float to q7 and then store the results in the destination buffer */
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in = *pIn++;
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in = (in * 128);
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in += in > 0.0f ? 0.5f : -0.5f;
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*pDst++ = (q7_t) (__SSAT((q15_t) (in), 8));
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#else
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/* C = A * 128 */
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/* Convert from float to q7 and then store the results in the destination buffer */
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*pDst++ = __SSAT((q31_t) (*pIn++ * 128.0f), 8);
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#endif /* #ifdef ARM_MATH_ROUNDING */
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/* Decrement the 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_float_to_q7(
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const float32_t * pSrc,
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q7_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 float32_t *pIn = pSrc; /* Source pointer */
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#ifdef ARM_MATH_ROUNDING
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float32_t in;
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#endif /* #ifdef ARM_MATH_ROUNDING */
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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 = A * 128 */
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/* Convert from float to q7 and store result in destination buffer */
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#ifdef ARM_MATH_ROUNDING
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in = (*pIn++ * 128);
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in += in > 0.0f ? 0.5f : -0.5f;
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*pDst++ = (q7_t) (__SSAT((q15_t) (in), 8));
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in = (*pIn++ * 128);
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in += in > 0.0f ? 0.5f : -0.5f;
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*pDst++ = (q7_t) (__SSAT((q15_t) (in), 8));
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in = (*pIn++ * 128);
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in += in > 0.0f ? 0.5f : -0.5f;
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*pDst++ = (q7_t) (__SSAT((q15_t) (in), 8));
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in = (*pIn++ * 128);
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in += in > 0.0f ? 0.5f : -0.5f;
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*pDst++ = (q7_t) (__SSAT((q15_t) (in), 8));
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#else
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*pDst++ = __SSAT((q31_t) (*pIn++ * 128.0f), 8);
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*pDst++ = __SSAT((q31_t) (*pIn++ * 128.0f), 8);
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*pDst++ = __SSAT((q31_t) (*pIn++ * 128.0f), 8);
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*pDst++ = __SSAT((q31_t) (*pIn++ * 128.0f), 8);
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#endif /* #ifdef ARM_MATH_ROUNDING */
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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 = A * 128 */
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/* Convert from float to q7 and store result in destination buffer */
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#ifdef ARM_MATH_ROUNDING
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in = (*pIn++ * 128);
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in += in > 0.0f ? 0.5f : -0.5f;
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*pDst++ = (q7_t) (__SSAT((q15_t) (in), 8));
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#else
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*pDst++ = (q7_t) __SSAT((q31_t) (*pIn++ * 128.0f), 8);
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#endif /* #ifdef ARM_MATH_ROUNDING */
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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 /* #if defined(ARM_MATH_NEON) */
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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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