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