1 | // Copyright 2015 Google Inc. All Rights Reserved. |
2 | // |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
4 | // you may not use this file except in compliance with the License. |
5 | // You may obtain a copy of the License at |
6 | // |
7 | // http://www.apache.org/licenses/LICENSE-2.0 |
8 | // |
9 | // Unless required by applicable law or agreed to in writing, software |
10 | // distributed under the License is distributed on an "AS IS" BASIS, |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
12 | // See the License for the specific language governing permissions and |
13 | // limitations under the License. |
14 | |
15 | #ifndef HIGHWAYHASH_COMPILER_SPECIFIC_H_ |
16 | #define HIGHWAYHASH_COMPILER_SPECIFIC_H_ |
17 | |
18 | // WARNING: this is a "restricted" header because it is included from |
19 | // translation units compiled with different flags. This header and its |
20 | // dependencies must not define any function unless it is static inline and/or |
21 | // within namespace HH_TARGET_NAME. See arch_specific.h for details. |
22 | |
23 | // Compiler |
24 | |
25 | // #if is shorter and safer than #ifdef. *_VERSION are zero if not detected, |
26 | // otherwise 100 * major + minor version. Note that other packages check for |
27 | // #ifdef COMPILER_MSVC, so we cannot use that same name. |
28 | |
29 | #ifdef _MSC_VER |
30 | #define HH_MSC_VERSION _MSC_VER |
31 | #else |
32 | #define HH_MSC_VERSION 0 |
33 | #endif |
34 | |
35 | #ifdef __GNUC__ |
36 | #define HH_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) |
37 | #else |
38 | #define HH_GCC_VERSION 0 |
39 | #endif |
40 | |
41 | #ifdef __clang__ |
42 | #define HH_CLANG_VERSION (__clang_major__ * 100 + __clang_minor__) |
43 | #else |
44 | #define HH_CLANG_VERSION 0 |
45 | #endif |
46 | |
47 | //----------------------------------------------------------------------------- |
48 | |
49 | #if HH_GCC_VERSION && HH_GCC_VERSION < 408 |
50 | #define HH_ALIGNAS(multiple) __attribute__((aligned(multiple))) |
51 | #else |
52 | #define HH_ALIGNAS(multiple) alignas(multiple) // C++11 |
53 | #endif |
54 | |
55 | #if HH_MSC_VERSION |
56 | #define HH_RESTRICT __restrict |
57 | #elif HH_GCC_VERSION |
58 | #define HH_RESTRICT __restrict__ |
59 | #else |
60 | #define HH_RESTRICT |
61 | #endif |
62 | |
63 | #if HH_MSC_VERSION |
64 | #define HH_INLINE __forceinline |
65 | #define HH_NOINLINE __declspec(noinline) |
66 | #else |
67 | #define HH_INLINE inline |
68 | #define HH_NOINLINE __attribute__((noinline)) |
69 | #endif |
70 | |
71 | #if HH_MSC_VERSION |
72 | // Unsupported, __assume is not the same. |
73 | #define HH_LIKELY(expr) expr |
74 | #define HH_UNLIKELY(expr) expr |
75 | #else |
76 | #define HH_LIKELY(expr) __builtin_expect(!!(expr), 1) |
77 | #define HH_UNLIKELY(expr) __builtin_expect(!!(expr), 0) |
78 | #endif |
79 | |
80 | #if HH_MSC_VERSION |
81 | #include <intrin.h> |
82 | #pragma intrinsic(_ReadWriteBarrier) |
83 | #define HH_COMPILER_FENCE _ReadWriteBarrier() |
84 | #elif HH_GCC_VERSION |
85 | #define HH_COMPILER_FENCE asm volatile("" : : : "memory") |
86 | #else |
87 | #define HH_COMPILER_FENCE |
88 | #endif |
89 | |
90 | #endif // HIGHWAYHASH_COMPILER_SPECIFIC_H_ |
91 | |