| /* ---------------------------------------------------------------------- |
| * Project: CMSIS DSP Library |
| * Title: arm_dot_prod_f32.c |
| * Description: Floating-point dot product |
| * |
| * $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 |
| */ |
| |
| /** |
| @defgroup BasicDotProd Vector Dot Product |
| |
| Computes the dot product of two vectors. |
| The vectors are multiplied element-by-element and then summed. |
| |
| <pre> |
| sum = pSrcA[0]*pSrcB[0] + pSrcA[1]*pSrcB[1] + ... + pSrcA[blockSize-1]*pSrcB[blockSize-1] |
| </pre> |
| |
| There are separate functions for floating-point, Q7, Q15, and Q31 data types. |
| */ |
| |
| /** |
| @addtogroup BasicDotProd |
| @{ |
| */ |
| |
| /** |
| @brief Dot product of floating-point vectors. |
| @param[in] pSrcA points to the first input vector. |
| @param[in] pSrcB points to the second input vector. |
| @param[in] blockSize number of samples in each vector. |
| @param[out] result output result returned here. |
| @return none |
| */ |
| |
| void arm_dot_prod_f32( |
| const float32_t * pSrcA, |
| const float32_t * pSrcB, |
| uint32_t blockSize, |
| float32_t * result) |
| { |
| uint32_t blkCnt; /* Loop counter */ |
| float32_t sum = 0.0f; /* Temporary return variable */ |
| |
| #if defined(ARM_MATH_NEON) |
| float32x4_t vec1; |
| float32x4_t vec2; |
| float32x4_t res; |
| float32x4_t accum = vdupq_n_f32(0); |
| |
| /* Compute 4 outputs at a time */ |
| blkCnt = blockSize >> 2U; |
| |
| vec1 = vld1q_f32(pSrcA); |
| vec2 = vld1q_f32(pSrcB); |
| |
| while (blkCnt > 0U) |
| { |
| /* C = A[0]*B[0] + A[1]*B[1] + A[2]*B[2] + ... + A[blockSize-1]*B[blockSize-1] */ |
| /* Calculate dot product and then store the result in a temporary buffer. */ |
| |
| accum = vmlaq_f32(accum, vec1, vec2); |
| |
| /* Increment pointers */ |
| pSrcA += 4; |
| pSrcB += 4; |
| |
| vec1 = vld1q_f32(pSrcA); |
| vec2 = vld1q_f32(pSrcB); |
| |
| /* Decrement the loop counter */ |
| blkCnt--; |
| } |
| |
| #if __aarch64__ |
| sum = vpadds_f32(vpadd_f32(vget_low_f32(accum), vget_high_f32(accum))); |
| #else |
| sum = (vpadd_f32(vget_low_f32(accum), vget_high_f32(accum)))[0] + (vpadd_f32(vget_low_f32(accum), vget_high_f32(accum)))[1]; |
| #endif |
| |
| /* Tail */ |
| blkCnt = blockSize & 0x3; |
| |
| #else |
| #if defined (ARM_MATH_LOOPUNROLL) |
| |
| /* Loop unrolling: Compute 4 outputs at a time */ |
| 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) |
| { |
| /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */ |
| |
| /* Calculate dot product and store result in a temporary buffer. */ |
| sum += (*pSrcA++) * (*pSrcB++); |
| |
| sum += (*pSrcA++) * (*pSrcB++); |
| |
| sum += (*pSrcA++) * (*pSrcB++); |
| |
| sum += (*pSrcA++) * (*pSrcB++); |
| |
| /* 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) */ |
| #endif /* #if defined(ARM_MATH_NEON) */ |
| |
| while (blkCnt > 0U) |
| { |
| /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */ |
| |
| /* Calculate dot product and store result in a temporary buffer. */ |
| sum += (*pSrcA++) * (*pSrcB++); |
| |
| /* Decrement loop counter */ |
| blkCnt--; |
| } |
| |
| /* Store result in destination buffer */ |
| *result = sum; |
| } |
| |
| /** |
| @} end of BasicDotProd group |
| */ |