| /* |
| * Copyright (C) 2010-2018 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. |
| */ |
| |
| /* ---------------------------------------------------------------------- |
| * Project: CMSIS NN Library |
| * Title: arm_nn_mult_q15.c |
| * Description: Q15 vector multiplication with variable output shifts |
| * |
| * $Date: 13. July 2018 |
| * $Revision: V.1.0.0 |
| * |
| * Target Processor: Cortex-M cores |
| * |
| * -------------------------------------------------------------------- */ |
| |
| #include "arm_nnfunctions.h" |
| |
| /** |
| * @ingroup groupSupport |
| */ |
| |
| /** |
| * @addtogroup NNBasicMath |
| * @{ |
| */ |
| |
| |
| /** |
| * @brief Q7 vector multiplication with variable output shifts |
| * @param[in] *pSrcA pointer to the first input vector |
| * @param[in] *pSrcB pointer to the second input vector |
| * @param[out] *pDst pointer to the output vector |
| * @param[in] out_shift amount of right-shift for output |
| * @param[in] blockSize number of samples in each vector |
| * @return none. |
| * |
| * <b>Scaling and Overflow Behavior:</b> |
| * \par |
| * The function uses saturating arithmetic. |
| * Results outside of the allowable Q15 range [0x8000 0x7FFF] will be saturated. |
| */ |
| |
| void arm_nn_mult_q15( |
| q15_t * pSrcA, |
| q15_t * pSrcB, |
| q15_t * pDst, |
| const uint16_t out_shift, |
| uint32_t blockSize) |
| { |
| uint32_t blkCnt; /* loop counters */ |
| |
| #if defined (ARM_MATH_DSP) |
| |
| /* Run the below code for Cortex-M4 and Cortex-M3 */ |
| 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 */ |
| |
| /* loop Unrolling */ |
| blkCnt = blockSize >> 2U; |
| |
| /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
| ** a second loop below computes the remaining 1 to 3 samples. */ |
| while (blkCnt > 0U) |
| { |
| /* read two samples at a time from sourceA */ |
| inA1 = *__SIMD32(pSrcA)++; |
| /* read two samples at a time from sourceB */ |
| inB1 = *__SIMD32(pSrcB)++; |
| /* read two samples at a time from sourceA */ |
| inA2 = *__SIMD32(pSrcA)++; |
| /* read two samples at a time from sourceB */ |
| inB2 = *__SIMD32(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 + NN_ROUND(out_shift)) >> out_shift, 16); |
| out2 = (q15_t) __SSAT((mul2 + NN_ROUND(out_shift)) >> out_shift, 16); |
| out3 = (q15_t) __SSAT((mul3 + NN_ROUND(out_shift)) >> out_shift, 16); |
| out4 = (q15_t) __SSAT((mul4 + NN_ROUND(out_shift)) >> out_shift, 16); |
| |
| /* store the result */ |
| #ifndef ARM_MATH_BIG_ENDIAN |
| |
| *__SIMD32(pDst)++ = __PKHBT(out2, out1, 16); |
| *__SIMD32(pDst)++ = __PKHBT(out4, out3, 16); |
| |
| #else |
| |
| *__SIMD32(pDst)++ = __PKHBT(out2, out1, 16); |
| *__SIMD32(pDst)++ = __PKHBT(out4, out3, 16); |
| |
| #endif /* #ifndef ARM_MATH_BIG_ENDIAN */ |
| |
| /* Decrement the blockSize loop counter */ |
| blkCnt--; |
| } |
| |
| /* If the blockSize is not a multiple of 4, compute any remaining output samples here. |
| ** No loop unrolling is used. */ |
| blkCnt = blockSize % 0x4U; |
| |
| #else |
| |
| /* Run the below code for Cortex-M0 */ |
| |
| /* Initialize blkCnt with number of samples */ |
| blkCnt = blockSize; |
| |
| #endif /* #if defined (ARM_MATH_DSP) */ |
| |
| |
| while (blkCnt > 0U) |
| { |
| /* C = A * B */ |
| /* Multiply the inputs and store the result in the destination buffer */ |
| *pDst++ = (q15_t) __SSAT((((q31_t) (*pSrcA++) * (*pSrcB++) + NN_ROUND(out_shift)) >> out_shift), 16); |
| |
| /* Decrement the blockSize loop counter */ |
| blkCnt--; |
| } |
| } |
| |
| /** |
| * @} end of NNBasicMath group |
| */ |
| |