75381150fd
Formatting Pass 1 Lots of fixups to adding stdint and stdbool all over the place Formatting Pass 2 Formatting Pass 3 Formatting Pass 4 Update app_bt_stream.cpp
137 lines
4.1 KiB
C
137 lines
4.1 KiB
C
/* ----------------------------------------------------------------------
|
|
* Project: CMSIS DSP Library
|
|
* Title: arm_mult_q15.c
|
|
* Description: Q15 vector multiplication
|
|
*
|
|
* $Date: 18. March 2019
|
|
* $Revision: V1.6.0
|
|
*
|
|
* Target Processor: Cortex-M cores
|
|
* -------------------------------------------------------------------- */
|
|
/*
|
|
* Copyright (C) 2010-2019 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 "arm_math.h"
|
|
|
|
/**
|
|
@ingroup groupMath
|
|
*/
|
|
|
|
/**
|
|
@addtogroup BasicMult
|
|
@{
|
|
*/
|
|
|
|
/**
|
|
@brief Q15 vector multiplication
|
|
@param[in] pSrcA points to first input vector
|
|
@param[in] pSrcB points to second input vector
|
|
@param[out] pDst points to output vector
|
|
@param[in] blockSize number of samples in each vector
|
|
@return none
|
|
|
|
@par Scaling and Overflow Behavior
|
|
The function uses saturating arithmetic.
|
|
Results outside of the allowable Q15 range [0x8000 0x7FFF]
|
|
are saturated.
|
|
*/
|
|
|
|
void arm_mult_q15(const q15_t *pSrcA, const q15_t *pSrcB, q15_t *pDst,
|
|
uint32_t blockSize) {
|
|
uint32_t blkCnt; /* Loop counter */
|
|
|
|
#if defined(ARM_MATH_LOOPUNROLL)
|
|
|
|
#if defined(ARM_MATH_DSP)
|
|
q31_t inA1, inA2, inB1, inB2; /* Temporary input variables */
|
|
q15_t out1, out2, out3, out4; /* Temporary output variables */
|
|
q31_t mul1, mul2, mul3, mul4; /* Temporary variables */
|
|
#endif
|
|
|
|
/* Loop unrolling: Compute 4 outputs at a time */
|
|
blkCnt = blockSize >> 2U;
|
|
|
|
while (blkCnt > 0U) {
|
|
/* C = A * B */
|
|
|
|
#if defined(ARM_MATH_DSP)
|
|
/* read 2 samples at a time from sourceA */
|
|
inA1 = read_q15x2_ia((q15_t **)&pSrcA);
|
|
/* read 2 samples at a time from sourceB */
|
|
inB1 = read_q15x2_ia((q15_t **)&pSrcB);
|
|
/* read 2 samples at a time from sourceA */
|
|
inA2 = read_q15x2_ia((q15_t **)&pSrcA);
|
|
/* read 2 samples at a time from sourceB */
|
|
inB2 = read_q15x2_ia((q15_t **)&pSrcB);
|
|
|
|
/* multiply mul = sourceA * sourceB */
|
|
mul1 = (q31_t)((q15_t)(inA1 >> 16) * (q15_t)(inB1 >> 16));
|
|
mul2 = (q31_t)((q15_t)(inA1) * (q15_t)(inB1));
|
|
mul3 = (q31_t)((q15_t)(inA2 >> 16) * (q15_t)(inB2 >> 16));
|
|
mul4 = (q31_t)((q15_t)(inA2) * (q15_t)(inB2));
|
|
|
|
/* saturate result to 16 bit */
|
|
out1 = (q15_t)__SSAT(mul1 >> 15, 16);
|
|
out2 = (q15_t)__SSAT(mul2 >> 15, 16);
|
|
out3 = (q15_t)__SSAT(mul3 >> 15, 16);
|
|
out4 = (q15_t)__SSAT(mul4 >> 15, 16);
|
|
|
|
/* store result to destination */
|
|
#ifndef ARM_MATH_BIG_ENDIAN
|
|
write_q15x2_ia(&pDst, __PKHBT(out2, out1, 16));
|
|
write_q15x2_ia(&pDst, __PKHBT(out4, out3, 16));
|
|
#else
|
|
write_q15x2_ia(&pDst, __PKHBT(out1, out2, 16));
|
|
write_q15x2_ia(&pDst, __PKHBT(out3, out4, 16));
|
|
#endif /* #ifndef ARM_MATH_BIG_ENDIAN */
|
|
|
|
#else
|
|
*pDst++ = (q15_t)__SSAT((((q31_t)(*pSrcA++) * (*pSrcB++)) >> 15), 16);
|
|
*pDst++ = (q15_t)__SSAT((((q31_t)(*pSrcA++) * (*pSrcB++)) >> 15), 16);
|
|
*pDst++ = (q15_t)__SSAT((((q31_t)(*pSrcA++) * (*pSrcB++)) >> 15), 16);
|
|
*pDst++ = (q15_t)__SSAT((((q31_t)(*pSrcA++) * (*pSrcB++)) >> 15), 16);
|
|
#endif
|
|
|
|
/* Decrement loop counter */
|
|
blkCnt--;
|
|
}
|
|
|
|
/* Loop unrolling: Compute remaining outputs */
|
|
blkCnt = blockSize % 0x4U;
|
|
|
|
#else
|
|
|
|
/* Initialize blkCnt with number of samples */
|
|
blkCnt = blockSize;
|
|
|
|
#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
|
|
|
|
while (blkCnt > 0U) {
|
|
/* C = A * B */
|
|
|
|
/* Multiply inputs and store result in destination buffer. */
|
|
*pDst++ = (q15_t)__SSAT((((q31_t)(*pSrcA++) * (*pSrcB++)) >> 15), 16);
|
|
|
|
/* Decrement loop counter */
|
|
blkCnt--;
|
|
}
|
|
}
|
|
|
|
/**
|
|
@} end of BasicMult group
|
|
*/
|