/* Copyright 2016 Google Inc. All Rights Reserved. | |
Distributed under MIT license. | |
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT | |
*/ | |
/* Macros for compiler / platform specific features and build options. */ | |
#ifndef BROTLI_COMMON_PORT_H_ | |
#define BROTLI_COMMON_PORT_H_ | |
/* Compatibility with non-clang compilers. */ | |
#ifndef __has_builtin | |
#define __has_builtin(x) 0 | |
#endif | |
#ifndef __has_attribute | |
#define __has_attribute(x) 0 | |
#endif | |
#ifndef __has_feature | |
#define __has_feature(x) 0 | |
#endif | |
#if defined(__GNUC__) && defined(__GNUC_MINOR__) | |
#define BROTLI_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) | |
#else | |
#define BROTLI_GCC_VERSION 0 | |
#endif | |
#if defined(__ICC) | |
#define BROTLI_ICC_VERSION __ICC | |
#else | |
#define BROTLI_ICC_VERSION 0 | |
#endif | |
#if defined(BROTLI_BUILD_MODERN_COMPILER) | |
#define BROTLI_MODERN_COMPILER 1 | |
#elif BROTLI_GCC_VERSION > 300 || BROTLI_ICC_VERSION >= 1600 | |
#define BROTLI_MODERN_COMPILER 1 | |
#else | |
#define BROTLI_MODERN_COMPILER 0 | |
#endif | |
/* Define "PREDICT_TRUE" and "PREDICT_FALSE" macros for capable compilers. | |
To apply compiler hint, enclose the branching condition into macros, like this: | |
if (PREDICT_TRUE(zero == 0)) { | |
// main execution path | |
} else { | |
// compiler should place this code outside of main execution path | |
} | |
OR: | |
if (PREDICT_FALSE(something_rare_or_unexpected_happens)) { | |
// compiler should place this code outside of main execution path | |
} | |
*/ | |
#if BROTLI_MODERN_COMPILER || __has_builtin(__builtin_expect) | |
#define PREDICT_TRUE(x) (__builtin_expect(!!(x), 1)) | |
#define PREDICT_FALSE(x) (__builtin_expect(x, 0)) | |
#else | |
#define PREDICT_FALSE(x) (x) | |
#define PREDICT_TRUE(x) (x) | |
#endif | |
#if BROTLI_MODERN_COMPILER || __has_attribute(always_inline) | |
#define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((always_inline)) | |
#else | |
#define ATTRIBUTE_ALWAYS_INLINE | |
#endif | |
#if defined(_WIN32) || defined(__CYGWIN__) | |
#define ATTRIBUTE_VISIBILITY_HIDDEN | |
#elif BROTLI_MODERN_COMPILER || __has_attribute(visibility) | |
#define ATTRIBUTE_VISIBILITY_HIDDEN __attribute__ ((visibility ("hidden"))) | |
#else | |
#define ATTRIBUTE_VISIBILITY_HIDDEN | |
#endif | |
#ifndef BROTLI_INTERNAL | |
#define BROTLI_INTERNAL ATTRIBUTE_VISIBILITY_HIDDEN | |
#endif | |
#ifndef _MSC_VER | |
#if defined(__cplusplus) || !defined(__STRICT_ANSI__) || \ | |
__STDC_VERSION__ >= 199901L | |
#define BROTLI_INLINE inline ATTRIBUTE_ALWAYS_INLINE | |
#else | |
#define BROTLI_INLINE | |
#endif | |
#else /* _MSC_VER */ | |
#define BROTLI_INLINE __forceinline | |
#endif /* _MSC_VER */ | |
#if BROTLI_MODERN_COMPILER || __has_attribute(noinline) | |
#define BROTLI_NOINLINE __attribute__((noinline)) | |
#else | |
#define BROTLI_NOINLINE | |
#endif | |
#define BROTLI_UNUSED(X) (void)(X) | |
#endif /* BROTLI_COMMON_PORT_H_ */ |