/* * Copyright (c) 2016-present, Yann Collet, Facebook, Inc. * All rights reserved. * * This source code is licensed under both the BSD-style license (found in the * LICENSE file in the root directory of this source tree) and the GPLv2 (found * in the COPYING file in the root directory of this source tree). * You may select, at your option, one of the above-listed licenses. */ #ifndef ZSTD_COMPILER_H #define ZSTD_COMPILER_H /*-******************************************************* * Compiler specifics *********************************************************/ /* force inlining */ #if defined (__GNUC__) || defined(__cplusplus) || defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ # define INLINE_KEYWORD inline #else # define INLINE_KEYWORD #endif #if defined(__GNUC__) # define FORCE_INLINE_ATTR __attribute__((always_inline)) #elif defined(_MSC_VER) # define FORCE_INLINE_ATTR __forceinline #else # define FORCE_INLINE_ATTR #endif /** * FORCE_INLINE_TEMPLATE is used to define C "templates", which take constant * parameters. They must be inlined for the compiler to elimininate the constant * branches. */ #define FORCE_INLINE_TEMPLATE static INLINE_KEYWORD FORCE_INLINE_ATTR /** * HINT_INLINE is used to help the compiler generate better code. It is *not* * used for "templates", so it can be tweaked based on the compilers * performance. * * gcc-4.8 and gcc-4.9 have been shown to benefit from leaving off the * always_inline attribute. * * clang up to 5.0.0 (trunk) benefit tremendously from the always_inline * attribute. */ #if !defined(__clang__) && defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 8 && __GNUC__ < 5 # define HINT_INLINE static INLINE_KEYWORD #else # define HINT_INLINE static INLINE_KEYWORD FORCE_INLINE_ATTR #endif /* force no inlining */ #ifdef _MSC_VER # define FORCE_NOINLINE static __declspec(noinline) #else # ifdef __GNUC__ # define FORCE_NOINLINE static __attribute__((__noinline__)) # else # define FORCE_NOINLINE static # endif #endif /* target attribute */ #ifndef __has_attribute #define __has_attribute(x) 0 /* Compatibility with non-clang compilers. */ #endif #if defined(__GNUC__) # define TARGET_ATTRIBUTE(target) __attribute__((__target__(target))) #else # define TARGET_ATTRIBUTE(target) #endif /* Enable runtime BMI2 dispatch based on the CPU. * Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default. */ #ifndef DYNAMIC_BMI2 #if (defined(__clang__) && __has_attribute(__target__)) \ || (defined(__GNUC__) \ && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))) \ && (defined(__x86_64__) || defined(_M_X86)) \ && !defined(__BMI2__) # define DYNAMIC_BMI2 1 #else # define DYNAMIC_BMI2 0 #endif #endif /* prefetch */ #if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) /* _mm_prefetch() is not defined outside of x86/x64 */ # include <mmintrin.h> /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */ # define PREFETCH(ptr) _mm_prefetch((const char*)ptr, _MM_HINT_T0) #elif defined(__GNUC__) # define PREFETCH(ptr) __builtin_prefetch(ptr, 0, 0) #else # define PREFETCH(ptr) /* disabled */ #endif /* disable warnings */ #ifdef _MSC_VER /* Visual Studio */ # include <intrin.h> /* For Visual 2005 */ # pragma warning(disable : 4100) /* disable: C4100: unreferenced formal parameter */ # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ # pragma warning(disable : 4204) /* disable: C4204: non-constant aggregate initializer */ # pragma warning(disable : 4214) /* disable: C4214: non-int bitfields */ # pragma warning(disable : 4324) /* disable: C4324: padded structure */ #endif #endif /* ZSTD_COMPILER_H */