1/* Copyright 2019 Google LLC. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#include "ruy/tune.h"
17
18#include <algorithm>
19#include <cstdint>
20
21#include "ruy/cpuinfo.h"
22
23namespace ruy {
24
25Tuning TuningResolver::ResolveNow(CpuInfo* cpuinfo) {
26 if (cpuinfo->CurrentCpuIsA55ish()) {
27 return Tuning::kA55ish;
28 }
29 if (cpuinfo->CurrentCpuIsX1()) {
30 return Tuning::kX1;
31 }
32 return Tuning::kGeneric;
33}
34
35TuningResolver::TuningResolver()
36 : expiry_duration_(DurationFromMilliseconds(250)) {}
37
38Tuning TuningResolver::Resolve(CpuInfo* cpuinfo) {
39 if (unresolved_tuning_ != Tuning::kAuto) {
40 return unresolved_tuning_;
41 }
42 TimePoint new_timepoint = CoarseNow();
43 if (last_resolved_tuning_ != Tuning::kAuto &&
44 (new_timepoint - last_resolved_timepoint_) < expiry_duration_) {
45 return last_resolved_tuning_;
46 }
47 last_resolved_timepoint_ = new_timepoint;
48 last_resolved_tuning_ = ResolveNow(cpuinfo);
49 return last_resolved_tuning_;
50}
51
52} // namespace ruy
53