1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
/**
* \file dnn/src/arm_common/elemwise_helper/kimpl/true_div.h
* MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
*
* Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*/
#pragma once
#include "src/arm_common/elemwise_helper/kimpl/op_base.h"
namespace megdnn {
namespace arm_common {
//! use a couple Newton-Raphson steps to refine the estimate.
//! A / B => 1. rB = vrecpeq_f32(B) 2. rB= vmulq_f32(vrecpsq_f32(B, rB), rB)
//! 3. A * rB
template <typename src_ctype, typename dst_ctype = src_ctype>
struct TrueDivOpBase : BinaryOpBase<src_ctype, dst_ctype> {
using BinaryOpBase<src_ctype, dst_ctype>::BinaryOpBase;
void operator()(
const src_ctype& src0, const src_ctype& src1, dst_ctype* dst) const {
*dst = operator()(src0, src1);
}
dst_ctype operator()(const src_ctype& src0, const src_ctype& src1) const {
return src0 / src1;
}
};
#if MEGDNN_AARCH64
template <typename src_ctype, typename dst_ctype = src_ctype>
struct TrueDivOp;
#define OP(_ctype, _neon_type, _neon_type2, _func_suffix, _simd_width) \
template <> \
struct TrueDivOp<_ctype> : TrueDivOpBase<_ctype> { \
using TrueDivOpBase::TrueDivOpBase; \
using TrueDivOpBase::operator(); \
constexpr static size_t SIMD_WIDTH = _simd_width; \
void operator()( \
const _neon_type2& src0, const _neon_type2& src1, \
dst_ctype* dst) const { \
auto vitem = operator()(src0, src1); \
vst1q_##_func_suffix(dst, vitem.val[0]); \
vst1q_##_func_suffix(dst + SIMD_WIDTH, vitem.val[1]); \
} \
_neon_type2 operator()( \
const _neon_type2& src0, const _neon_type2& src1) const { \
auto val1 = src0.val[0]; \
auto val2 = src0.val[1]; \
auto val3 = src1.val[0]; \
auto val4 = src1.val[1]; \
val1 = vdivq_##_func_suffix(val1, val3); \
val2 = vdivq_##_func_suffix(val2, val4); \
return {{val1, val2}}; \
} \
void operator()( \
const _neon_type& src0, const _neon_type& src1, \
dst_ctype* dst) const { \
auto vitem = operator()(src0, src1); \
vst1q_##_func_suffix(dst, vitem); \
} \
_neon_type operator()(const _neon_type& src0, const _neon_type& src1) const { \
return vdivq_##_func_suffix(src0, src1); \
} \
};
OP(dt_float32, float32x4_t, float32x4x2_t, f32, 4)
#if __ARM_FEATURE_FP16_VECTOR_ARITHMETIC
OP(__fp16, float16x8_t, float16x8x2_t, f16, 8)
#endif
#undef OP
#else
template <typename src_ctype, typename dst_ctype = src_ctype>
struct TrueDivOp : TrueDivOpBase<src_ctype, dst_ctype> {
using TrueDivOpBase<src_ctype, dst_ctype>::TrueDivOpBase;
using TrueDivOpBase<src_ctype, dst_ctype>::operator();
};
#endif
} // namespace arm_common
} // namespace megdnn
// vim: syntax=cpp.doxygen