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