tesseract 4.1.1
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simddetect.h
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1
2// File: simddetect.h
3// Description: Architecture detector.
4// Author: Stefan Weil (based on code from Ray Smith)
5//
6// (C) Copyright 2014, Google Inc.
7// Licensed under the Apache License, Version 2.0 (the "License");
8// you may not use this file except in compliance with the License.
9// You may obtain a copy of the License at
10// http://www.apache.org/licenses/LICENSE-2.0
11// Unless required by applicable law or agreed to in writing, software
12// distributed under the License is distributed on an "AS IS" BASIS,
13// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14// See the License for the specific language governing permissions and
15// limitations under the License.
17#ifndef TESSERACT_ARCH_SIMDDETECT_H_
18#define TESSERACT_ARCH_SIMDDETECT_H_
19
20#include "platform.h"
21
22namespace tesseract {
23
24// Function pointer for best calculation of dot product.
25using DotProductFunction = double (*)(const double*, const double*, int);
27
28// Architecture detector. Add code here to detect any other architectures for
29// SIMD-based faster dot product functions. Intended to be a single static
30// object, but it does no real harm to have more than one.
32 public:
33 // Returns true if AVX is available on this system.
34 static inline bool IsAVXAvailable() {
35 return detector.avx_available_;
36 }
37 // Returns true if AVX2 (integer support) is available on this system.
38 static inline bool IsAVX2Available() {
39 return detector.avx2_available_;
40 }
41 // Returns true if AVX512 Foundation (float) is available on this system.
42 static inline bool IsAVX512FAvailable() {
43 return detector.avx512F_available_;
44 }
45 // Returns true if AVX512 integer is available on this system.
46 static inline bool IsAVX512BWAvailable() {
47 return detector.avx512BW_available_;
48 }
49 // Returns true if FMA is available on this system.
50 static inline bool IsFMAAvailable() {
51 return detector.fma_available_;
52 }
53 // Returns true if SSE4.1 is available on this system.
54 static inline bool IsSSEAvailable() {
55 return detector.sse_available_;
56 }
57
58 // Update settings after config variable was set.
59 static TESS_API void Update();
60
61 private:
62 // Constructor, must set all static member variables.
63 SIMDDetect();
64
65 private:
66 // Singleton.
67 static SIMDDetect detector;
68 // If true, then AVX has been detected.
69 static TESS_API bool avx_available_;
70 static TESS_API bool avx2_available_;
71 static TESS_API bool avx512F_available_;
72 static TESS_API bool avx512BW_available_;
73 // If true, then FMA has been detected.
74 static TESS_API bool fma_available_;
75 // If true, then SSe4.1 has been detected.
76 static TESS_API bool sse_available_;
77};
78
79} // namespace tesseract
80
81#endif // TESSERACT_ARCH_SIMDDETECT_H_
#define TESS_API
Definition: platform.h:54
double(*)(const double *, const double *, int) DotProductFunction
Definition: simddetect.h:25
DotProductFunction DotProduct
Definition: simddetect.cpp:49
static bool IsAVX512BWAvailable()
Definition: simddetect.h:46
static bool IsFMAAvailable()
Definition: simddetect.h:50
static bool IsAVXAvailable()
Definition: simddetect.h:34
static bool IsAVX512FAvailable()
Definition: simddetect.h:42
static bool IsSSEAvailable()
Definition: simddetect.h:54
static bool IsAVX2Available()
Definition: simddetect.h:38
static TESS_API void Update()
Definition: simddetect.cpp:173