Joep D / CMSIS_DSP_5

The CMSIS DSP 5 library

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functions/BasicMathFunctions/arm_dot_prod_f32.c@3:4098b9d3d571, 2018-06-21 (annotated)

Committer:
xorjoep
Date:
Thu Jun 21 11:56:27 2018 +0000
Revision:
3:4098b9d3d571
Parent:
1:24714b45cd1b 
headers is a folder not a library

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xorjoep 1:24714b45cd1b 1 /* ----------------------------------------------------------------------
xorjoep 1:24714b45cd1b 2 * Project: CMSIS DSP Library
xorjoep 1:24714b45cd1b 3 * Title: arm_dot_prod_f32.c
xorjoep 1:24714b45cd1b 4 * Description: Floating-point dot product
xorjoep 1:24714b45cd1b 5 *
xorjoep 1:24714b45cd1b 6 * $Date: 27. January 2017
xorjoep 1:24714b45cd1b 7 * $Revision: V.1.5.1
xorjoep 1:24714b45cd1b 8 *
xorjoep 1:24714b45cd1b 9 * Target Processor: Cortex-M cores
xorjoep 1:24714b45cd1b 10 * -------------------------------------------------------------------- */
xorjoep 1:24714b45cd1b 11 /*
xorjoep 1:24714b45cd1b 12 * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
xorjoep 1:24714b45cd1b 13 *
xorjoep 1:24714b45cd1b 14 * SPDX-License-Identifier: Apache-2.0
xorjoep 1:24714b45cd1b 15 *
xorjoep 1:24714b45cd1b 16 * Licensed under the Apache License, Version 2.0 (the License); you may
xorjoep 1:24714b45cd1b 17 * not use this file except in compliance with the License.
xorjoep 1:24714b45cd1b 18 * You may obtain a copy of the License at
xorjoep 1:24714b45cd1b 19 *
xorjoep 1:24714b45cd1b 20 * www.apache.org/licenses/LICENSE-2.0
xorjoep 1:24714b45cd1b 21 *
xorjoep 1:24714b45cd1b 22 * Unless required by applicable law or agreed to in writing, software
xorjoep 1:24714b45cd1b 23 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
xorjoep 1:24714b45cd1b 24 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
xorjoep 1:24714b45cd1b 25 * See the License for the specific language governing permissions and
xorjoep 1:24714b45cd1b 26 * limitations under the License.
xorjoep 1:24714b45cd1b 27 */
xorjoep 1:24714b45cd1b 28
xorjoep 1:24714b45cd1b 29 #include "arm_math.h"
xorjoep 1:24714b45cd1b 30
xorjoep 1:24714b45cd1b 31 /**
xorjoep 1:24714b45cd1b 32 * @ingroup groupMath
xorjoep 1:24714b45cd1b 33 */
xorjoep 1:24714b45cd1b 34
xorjoep 1:24714b45cd1b 35 /**
xorjoep 1:24714b45cd1b 36 * @defgroup dot_prod Vector Dot Product
xorjoep 1:24714b45cd1b 37 *
xorjoep 1:24714b45cd1b 38 * Computes the dot product of two vectors.
xorjoep 1:24714b45cd1b 39 * The vectors are multiplied element-by-element and then summed.
xorjoep 1:24714b45cd1b 40 *
xorjoep 1:24714b45cd1b 41 * <pre>
xorjoep 1:24714b45cd1b 42 * sum = pSrcA[0]*pSrcB[0] + pSrcA[1]*pSrcB[1] + ... + pSrcA[blockSize-1]*pSrcB[blockSize-1]
xorjoep 1:24714b45cd1b 43 * </pre>
xorjoep 1:24714b45cd1b 44 *
xorjoep 1:24714b45cd1b 45 * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
xorjoep 1:24714b45cd1b 46 */
xorjoep 1:24714b45cd1b 47
xorjoep 1:24714b45cd1b 48 /**
xorjoep 1:24714b45cd1b 49 * @addtogroup dot_prod
xorjoep 1:24714b45cd1b 50 * @{
xorjoep 1:24714b45cd1b 51 */
xorjoep 1:24714b45cd1b 52
xorjoep 1:24714b45cd1b 53 /**
xorjoep 1:24714b45cd1b 54 * @brief Dot product of floating-point vectors.
xorjoep 1:24714b45cd1b 55 * @param[in] *pSrcA points to the first input vector
xorjoep 1:24714b45cd1b 56 * @param[in] *pSrcB points to the second input vector
xorjoep 1:24714b45cd1b 57 * @param[in] blockSize number of samples in each vector
xorjoep 1:24714b45cd1b 58 * @param[out] *result output result returned here
xorjoep 1:24714b45cd1b 59 * @return none.
xorjoep 1:24714b45cd1b 60 */
xorjoep 1:24714b45cd1b 61
xorjoep 1:24714b45cd1b 62
xorjoep 1:24714b45cd1b 63 void arm_dot_prod_f32(
xorjoep 1:24714b45cd1b 64 float32_t * pSrcA,
xorjoep 1:24714b45cd1b 65 float32_t * pSrcB,
xorjoep 1:24714b45cd1b 66 uint32_t blockSize,
xorjoep 1:24714b45cd1b 67 float32_t * result)
xorjoep 1:24714b45cd1b 68 {
xorjoep 1:24714b45cd1b 69 float32_t sum = 0.0f; /* Temporary result storage */
xorjoep 1:24714b45cd1b 70 uint32_t blkCnt; /* loop counter */
xorjoep 1:24714b45cd1b 71
xorjoep 1:24714b45cd1b 72
xorjoep 1:24714b45cd1b 73 #if defined (ARM_MATH_DSP)
xorjoep 1:24714b45cd1b 74
xorjoep 1:24714b45cd1b 75 /* Run the below code for Cortex-M4 and Cortex-M3 */
xorjoep 1:24714b45cd1b 76 /*loop Unrolling */
xorjoep 1:24714b45cd1b 77 blkCnt = blockSize >> 2U;
xorjoep 1:24714b45cd1b 78
xorjoep 1:24714b45cd1b 79 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
xorjoep 1:24714b45cd1b 80 ** a second loop below computes the remaining 1 to 3 samples. */
xorjoep 1:24714b45cd1b 81 while (blkCnt > 0U)
xorjoep 1:24714b45cd1b 82 {
xorjoep 1:24714b45cd1b 83 /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
xorjoep 1:24714b45cd1b 84 /* Calculate dot product and then store the result in a temporary buffer */
xorjoep 1:24714b45cd1b 85 sum += (*pSrcA++) * (*pSrcB++);
xorjoep 1:24714b45cd1b 86 sum += (*pSrcA++) * (*pSrcB++);
xorjoep 1:24714b45cd1b 87 sum += (*pSrcA++) * (*pSrcB++);
xorjoep 1:24714b45cd1b 88 sum += (*pSrcA++) * (*pSrcB++);
xorjoep 1:24714b45cd1b 89
xorjoep 1:24714b45cd1b 90 /* Decrement the loop counter */
xorjoep 1:24714b45cd1b 91 blkCnt--;
xorjoep 1:24714b45cd1b 92 }
xorjoep 1:24714b45cd1b 93
xorjoep 1:24714b45cd1b 94 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
xorjoep 1:24714b45cd1b 95 ** No loop unrolling is used. */
xorjoep 1:24714b45cd1b 96 blkCnt = blockSize % 0x4U;
xorjoep 1:24714b45cd1b 97
xorjoep 1:24714b45cd1b 98 #else
xorjoep 1:24714b45cd1b 99
xorjoep 1:24714b45cd1b 100 /* Run the below code for Cortex-M0 */
xorjoep 1:24714b45cd1b 101
xorjoep 1:24714b45cd1b 102 /* Initialize blkCnt with number of samples */
xorjoep 1:24714b45cd1b 103 blkCnt = blockSize;
xorjoep 1:24714b45cd1b 104
xorjoep 1:24714b45cd1b 105 #endif /* #if defined (ARM_MATH_DSP) */
xorjoep 1:24714b45cd1b 106
xorjoep 1:24714b45cd1b 107
xorjoep 1:24714b45cd1b 108 while (blkCnt > 0U)
xorjoep 1:24714b45cd1b 109 {
xorjoep 1:24714b45cd1b 110 /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
xorjoep 1:24714b45cd1b 111 /* Calculate dot product and then store the result in a temporary buffer. */
xorjoep 1:24714b45cd1b 112 sum += (*pSrcA++) * (*pSrcB++);
xorjoep 1:24714b45cd1b 113
xorjoep 1:24714b45cd1b 114 /* Decrement the loop counter */
xorjoep 1:24714b45cd1b 115 blkCnt--;
xorjoep 1:24714b45cd1b 116 }
xorjoep 1:24714b45cd1b 117 /* Store the result back in the destination buffer */
xorjoep 1:24714b45cd1b 118 *result = sum;
xorjoep 1:24714b45cd1b 119 }
xorjoep 1:24714b45cd1b 120
xorjoep 1:24714b45cd1b 121 /**
xorjoep 1:24714b45cd1b 122 * @} end of dot_prod group
xorjoep 1:24714b45cd1b 123 */