Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | mjames | 1 | /* |
| 2 | * Copyright (C) 2010-2018 Arm Limited or its affiliates. All rights reserved. |
||
| 3 | * |
||
| 4 | * SPDX-License-Identifier: Apache-2.0 |
||
| 5 | * |
||
| 6 | * Licensed under the Apache License, Version 2.0 (the License); you may |
||
| 7 | * not use this file except in compliance with the License. |
||
| 8 | * You may obtain a copy of the License at |
||
| 9 | * |
||
| 10 | * www.apache.org/licenses/LICENSE-2.0 |
||
| 11 | * |
||
| 12 | * Unless required by applicable law or agreed to in writing, software |
||
| 13 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
||
| 14 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
||
| 15 | * See the License for the specific language governing permissions and |
||
| 16 | * limitations under the License. |
||
| 17 | */ |
||
| 18 | |||
| 19 | /* ---------------------------------------------------------------------- |
||
| 20 | * Project: CMSIS NN Library |
||
| 21 | * Title: arm_nn_mult_q7.c |
||
| 22 | * Description: Q7 vector multiplication with variable output shifts |
||
| 23 | * |
||
| 24 | * $Date: 13. July 2018 |
||
| 25 | * $Revision: V.1.0.0 |
||
| 26 | * |
||
| 27 | * Target Processor: Cortex-M cores |
||
| 28 | * |
||
| 29 | * -------------------------------------------------------------------- */ |
||
| 30 | |||
| 31 | #include "arm_nnfunctions.h" |
||
| 32 | |||
| 33 | /** |
||
| 34 | * @ingroup groupSupport |
||
| 35 | */ |
||
| 36 | |||
| 37 | /** |
||
| 38 | * @addtogroup NNBasicMath |
||
| 39 | * @{ |
||
| 40 | */ |
||
| 41 | |||
| 42 | /** |
||
| 43 | * @brief Q7 vector multiplication with variable output shifts |
||
| 44 | * @param[in] *pSrcA pointer to the first input vector |
||
| 45 | * @param[in] *pSrcB pointer to the second input vector |
||
| 46 | * @param[out] *pDst pointer to the output vector |
||
| 47 | * @param[in] out_shift amount of right-shift for output |
||
| 48 | * @param[in] blockSize number of samples in each vector |
||
| 49 | * @return none. |
||
| 50 | * |
||
| 51 | * <b>Scaling and Overflow Behavior:</b> |
||
| 52 | * \par |
||
| 53 | * The function uses saturating arithmetic. |
||
| 54 | * Results outside of the allowable Q7 range [0x80 0x7F] will be saturated. |
||
| 55 | */ |
||
| 56 | |||
| 57 | void arm_nn_mult_q7( |
||
| 58 | q7_t * pSrcA, |
||
| 59 | q7_t * pSrcB, |
||
| 60 | q7_t * pDst, |
||
| 61 | const uint16_t out_shift, |
||
| 62 | uint32_t blockSize) |
||
| 63 | { |
||
| 64 | uint32_t blkCnt; /* loop counters */ |
||
| 65 | |||
| 66 | #if defined (ARM_MATH_DSP) |
||
| 67 | |||
| 68 | /* Run the below code for Cortex-M4 and Cortex-M3 */ |
||
| 69 | q7_t out1, out2, out3, out4; /* Temporary variables to store the product */ |
||
| 70 | |||
| 71 | /* loop Unrolling */ |
||
| 72 | blkCnt = blockSize >> 2U; |
||
| 73 | |||
| 74 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
||
| 75 | ** a second loop below computes the remaining 1 to 3 samples. */ |
||
| 76 | while (blkCnt > 0U) |
||
| 77 | { |
||
| 78 | /* C = A * B */ |
||
| 79 | /* Multiply the inputs and store the results in temporary variables */ |
||
| 80 | out1 = (q7_t) __SSAT((((q15_t) (*pSrcA++) * (*pSrcB++) + NN_ROUND(out_shift)) >> out_shift), 8); |
||
| 81 | out2 = (q7_t) __SSAT((((q15_t) (*pSrcA++) * (*pSrcB++) + NN_ROUND(out_shift)) >> out_shift), 8); |
||
| 82 | out3 = (q7_t) __SSAT((((q15_t) (*pSrcA++) * (*pSrcB++) + NN_ROUND(out_shift)) >> out_shift), 8); |
||
| 83 | out4 = (q7_t) __SSAT((((q15_t) (*pSrcA++) * (*pSrcB++) + NN_ROUND(out_shift)) >> out_shift), 8); |
||
| 84 | |||
| 85 | /* Store the results of 4 inputs in the destination buffer in single cycle by packing */ |
||
| 86 | *__SIMD32(pDst)++ = __PACKq7(out1, out2, out3, out4); |
||
| 87 | |||
| 88 | /* Decrement the blockSize loop counter */ |
||
| 89 | blkCnt--; |
||
| 90 | } |
||
| 91 | |||
| 92 | /* If the blockSize is not a multiple of 4, compute any remaining output samples here. |
||
| 93 | ** No loop unrolling is used. */ |
||
| 94 | blkCnt = blockSize % 0x4U; |
||
| 95 | |||
| 96 | #else |
||
| 97 | |||
| 98 | /* Run the below code for Cortex-M0 */ |
||
| 99 | |||
| 100 | /* Initialize blkCnt with number of samples */ |
||
| 101 | blkCnt = blockSize; |
||
| 102 | |||
| 103 | #endif /* #if defined (ARM_MATH_DSP) */ |
||
| 104 | |||
| 105 | |||
| 106 | while (blkCnt > 0U) |
||
| 107 | { |
||
| 108 | /* C = A * B */ |
||
| 109 | /* Multiply the inputs and store the result in the destination buffer */ |
||
| 110 | *pDst++ = (q7_t) __SSAT((((q15_t) (*pSrcA++) * (*pSrcB++) + NN_ROUND(out_shift)) >> out_shift), 8); |
||
| 111 | |||
| 112 | /* Decrement the blockSize loop counter */ |
||
| 113 | blkCnt--; |
||
| 114 | } |
||
| 115 | } |
||
| 116 | |||
| 117 | /** |
||
| 118 | * @} end of NNBasicMath group |
||
| 119 | */ |