compiler.h
147 lines
| 5.0 KiB
| text/x-c
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CLexer
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r37513 | /* | ||
* 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 */ | ||||
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r42237 | |||
#if !defined(ZSTD_NO_INLINE) | ||||
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r37513 | #if defined (__GNUC__) || defined(__cplusplus) || defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ | ||
# define INLINE_KEYWORD inline | ||||
#else | ||||
# define INLINE_KEYWORD | ||||
#endif | ||||
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r43207 | #if defined(__GNUC__) || defined(__ICCARM__) | ||
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r37513 | # define FORCE_INLINE_ATTR __attribute__((always_inline)) | ||
#elif defined(_MSC_VER) | ||||
# define FORCE_INLINE_ATTR __forceinline | ||||
#else | ||||
# define FORCE_INLINE_ATTR | ||||
#endif | ||||
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r42237 | #else | ||
#define INLINE_KEYWORD | ||||
#define FORCE_INLINE_ATTR | ||||
#endif | ||||
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r37513 | /** | ||
* FORCE_INLINE_TEMPLATE is used to define C "templates", which take constant | ||||
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r43207 | * parameters. They must be inlined for the compiler to eliminate the constant | ||
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r37513 | * 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 | ||||
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r43207 | # if defined(__GNUC__) || defined(__ICCARM__) | ||
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r37513 | # 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 | ||||
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r43207 | #if defined(__GNUC__) || defined(__ICCARM__) | ||
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r37513 | # 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 | ||||
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r40157 | #if ((defined(__clang__) && __has_attribute(__target__)) \ | ||
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r37513 | || (defined(__GNUC__) \ | ||
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r40157 | && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))) \ | ||
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r37513 | && (defined(__x86_64__) || defined(_M_X86)) \ | ||
&& !defined(__BMI2__) | ||||
# define DYNAMIC_BMI2 1 | ||||
#else | ||||
# define DYNAMIC_BMI2 0 | ||||
#endif | ||||
#endif | ||||
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r40157 | /* prefetch | ||
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r42237 | * can be disabled, by declaring NO_PREFETCH build macro */ | ||
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r40157 | #if defined(NO_PREFETCH) | ||
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r42237 | # define PREFETCH_L1(ptr) (void)(ptr) /* disabled */ | ||
# define PREFETCH_L2(ptr) (void)(ptr) /* disabled */ | ||||
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r37513 | #else | ||
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r40157 | # 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 */ | ||||
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r42237 | # define PREFETCH_L1(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T0) | ||
# define PREFETCH_L2(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T1) | ||||
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r40157 | # elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) ) | ||
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r42237 | # define PREFETCH_L1(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 3 /* locality */) | ||
# define PREFETCH_L2(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 2 /* locality */) | ||||
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r40157 | # else | ||
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r42237 | # define PREFETCH_L1(ptr) (void)(ptr) /* disabled */ | ||
# define PREFETCH_L2(ptr) (void)(ptr) /* disabled */ | ||||
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r40157 | # endif | ||
#endif /* NO_PREFETCH */ | ||||
#define CACHELINE_SIZE 64 | ||||
#define PREFETCH_AREA(p, s) { \ | ||||
const char* const _ptr = (const char*)(p); \ | ||||
size_t const _size = (size_t)(s); \ | ||||
size_t _pos; \ | ||||
for (_pos=0; _pos<_size; _pos+=CACHELINE_SIZE) { \ | ||||
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r42237 | PREFETCH_L2(_ptr + _pos); \ | ||
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r40157 | } \ | ||
} | ||||
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r37513 | |||
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r43207 | /* vectorization */ | ||
#if !defined(__clang__) && defined(__GNUC__) | ||||
# define DONT_VECTORIZE __attribute__((optimize("no-tree-vectorize"))) | ||||
#else | ||||
# define DONT_VECTORIZE | ||||
#endif | ||||
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r37513 | /* 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 */ | ||||