1/*******************************************************************************
2* Copyright 2017-2018 Intel Corporation
3*
4* Licensed under the Apache License, Version 2.0 (the "License");
5* you may not use this file except in compliance with the License.
6* You may obtain a copy of the License at
7*
8* http://www.apache.org/licenses/LICENSE-2.0
9*
10* Unless required by applicable law or agreed to in writing, software
11* distributed under the License is distributed on an "AS IS" BASIS,
12* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13* See the License for the specific language governing permissions and
14* limitations under the License.
15*******************************************************************************/
16
17#ifndef CPU_SIMPLE_Q10N_HPP
18#define CPU_SIMPLE_Q10N_HPP
19
20#include <assert.h>
21
22#include "c_types_map.hpp"
23#include "math_utils.hpp"
24#include "nstl.hpp"
25#include "type_helpers.hpp"
26#include "utils.hpp"
27
28namespace mkldnn {
29namespace impl {
30namespace cpu {
31
32using namespace mkldnn::impl::math;
33
34template <typename out_t>
35inline out_t round_and_saturate(float f)
36{ return math::saturate<out_t>(out_round<int>(f)); }
37
38/* Quantization with alpha == 1 and beta == 0 */
39template <typename in_t, typename out_t, typename enabled = void>
40struct qz_a1b0 {
41 out_t operator()(in_t in)
42 { return round_and_saturate<out_t>((float)in); }
43};
44
45template <typename in_t, typename out_t>
46struct qz_a1b0<in_t, out_t,
47 typename utils::enable_if<true
48 && nstl::is_integral<in_t>::value
49 && !is_subset<in_t, out_t>::value
50 >::type> {
51 out_t operator()(in_t in) { return math::saturate<out_t>(in); }
52};
53
54template <typename in_t, typename out_t>
55struct qz_a1b0<in_t, out_t,
56 typename utils::enable_if<is_subset<in_t, out_t>::value>::type> {
57 out_t operator()(in_t in) { return (out_t)in; }
58};
59
60/* Quantization with alpha == 1 */
61template <typename in_t, typename out_t> struct qz_a1 {
62 out_t operator()(in_t in, out_t out, float beta)
63 { return round_and_saturate<out_t>((float)in + beta * out); }
64};
65
66template <typename in_t> struct qz_a1<in_t, float> {
67 float operator()(in_t in, float out, float beta)
68 { return (float)in + beta * out; }
69};
70
71/* Quantization with beta == 0 */
72template <typename in_t, typename out_t> struct qz_b0 {
73 out_t operator()(in_t in, float alpha)
74 { return round_and_saturate<out_t>(alpha * in); }
75};
76
77template <typename in_t> struct qz_b0<in_t, float> {
78 float operator()(in_t in, float alpha) { return alpha * in; }
79};
80
81/* Quantization */
82template <typename in_t, typename out_t> struct qz {
83 out_t operator()(in_t in, out_t out, float alpha, float beta) {
84 return round_and_saturate<out_t>(
85 alpha * in + (beta ? beta * out : 0));
86 }
87};
88
89template <typename in_t> struct qz<in_t, float> {
90 float operator()(in_t in, float out, float alpha, float beta)
91 { return alpha * in + (beta ? beta * out : 0); }
92};
93
94}
95}
96}
97
98#endif
99