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177 lines
5.7 KiB
177 lines
5.7 KiB
/* |
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* Copyright (c) Yann Collet, Facebook, Inc. |
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* All rights reserved. |
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* |
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* This source code is licensed under both the BSD-style license (found in the |
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found |
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* in the COPYING file in the root directory of this source tree). |
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* You may select, at your option, one of the above-listed licenses. |
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*/ |
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#ifndef ZSTD_COMPILER_H |
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#define ZSTD_COMPILER_H |
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/*-******************************************************* |
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* Compiler specifics |
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*********************************************************/ |
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/* force inlining */ |
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#if !defined(ZSTD_NO_INLINE) |
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#if (defined(__GNUC__) && !defined(__STRICT_ANSI__)) || defined(__cplusplus) || defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */ |
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# define INLINE_KEYWORD inline |
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#else |
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# define INLINE_KEYWORD |
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#endif |
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#define FORCE_INLINE_ATTR __attribute__((always_inline)) |
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#else |
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#define INLINE_KEYWORD |
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#define FORCE_INLINE_ATTR |
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#endif |
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/* |
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On MSVC qsort requires that functions passed into it use the __cdecl calling conversion(CC). |
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This explictly marks such functions as __cdecl so that the code will still compile |
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if a CC other than __cdecl has been made the default. |
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*/ |
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#define WIN_CDECL |
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/* |
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* FORCE_INLINE_TEMPLATE is used to define C "templates", which take constant |
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* parameters. They must be inlined for the compiler to eliminate the constant |
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* branches. |
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*/ |
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#define FORCE_INLINE_TEMPLATE static INLINE_KEYWORD FORCE_INLINE_ATTR |
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/* |
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* HINT_INLINE is used to help the compiler generate better code. It is *not* |
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* used for "templates", so it can be tweaked based on the compilers |
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* performance. |
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* |
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* gcc-4.8 and gcc-4.9 have been shown to benefit from leaving off the |
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* always_inline attribute. |
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* |
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* clang up to 5.0.0 (trunk) benefit tremendously from the always_inline |
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* attribute. |
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*/ |
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#if !defined(__clang__) && defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 8 && __GNUC__ < 5 |
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# define HINT_INLINE static INLINE_KEYWORD |
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#else |
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# define HINT_INLINE static INLINE_KEYWORD FORCE_INLINE_ATTR |
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#endif |
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/* UNUSED_ATTR tells the compiler it is okay if the function is unused. */ |
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#define UNUSED_ATTR __attribute__((unused)) |
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/* force no inlining */ |
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#define FORCE_NOINLINE static __attribute__((__noinline__)) |
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/* target attribute */ |
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#ifndef __has_attribute |
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#define __has_attribute(x) 0 /* Compatibility with non-clang compilers. */ |
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#endif |
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#define TARGET_ATTRIBUTE(target) __attribute__((__target__(target))) |
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/* Enable runtime BMI2 dispatch based on the CPU. |
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* Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default. |
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*/ |
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#ifndef DYNAMIC_BMI2 |
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#if ((defined(__clang__) && __has_attribute(__target__)) \ |
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|| (defined(__GNUC__) \ |
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&& (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))) \ |
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&& (defined(__x86_64__) || defined(_M_X86)) \ |
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&& !defined(__BMI2__) |
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# define DYNAMIC_BMI2 1 |
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#else |
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# define DYNAMIC_BMI2 0 |
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#endif |
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#endif |
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/* prefetch |
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* can be disabled, by declaring NO_PREFETCH build macro */ |
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#if ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) ) |
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# define PREFETCH_L1(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 3 /* locality */) |
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# define PREFETCH_L2(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 2 /* locality */) |
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#elif defined(__aarch64__) |
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# define PREFETCH_L1(ptr) __asm__ __volatile__("prfm pldl1keep, %0" ::"Q"(*(ptr))) |
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# define PREFETCH_L2(ptr) __asm__ __volatile__("prfm pldl2keep, %0" ::"Q"(*(ptr))) |
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#else |
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# define PREFETCH_L1(ptr) (void)(ptr) /* disabled */ |
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# define PREFETCH_L2(ptr) (void)(ptr) /* disabled */ |
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#endif /* NO_PREFETCH */ |
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#define CACHELINE_SIZE 64 |
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#define PREFETCH_AREA(p, s) { \ |
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const char* const _ptr = (const char*)(p); \ |
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size_t const _size = (size_t)(s); \ |
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size_t _pos; \ |
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for (_pos=0; _pos<_size; _pos+=CACHELINE_SIZE) { \ |
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PREFETCH_L2(_ptr + _pos); \ |
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} \ |
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} |
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/* vectorization |
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* older GCC (pre gcc-4.3 picked as the cutoff) uses a different syntax */ |
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#if !defined(__INTEL_COMPILER) && !defined(__clang__) && defined(__GNUC__) |
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# if (__GNUC__ == 4 && __GNUC_MINOR__ > 3) || (__GNUC__ >= 5) |
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# define DONT_VECTORIZE __attribute__((optimize("no-tree-vectorize"))) |
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# else |
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# define DONT_VECTORIZE _Pragma("GCC optimize(\"no-tree-vectorize\")") |
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# endif |
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#else |
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# define DONT_VECTORIZE |
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#endif |
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/* Tell the compiler that a branch is likely or unlikely. |
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* Only use these macros if it causes the compiler to generate better code. |
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* If you can remove a LIKELY/UNLIKELY annotation without speed changes in gcc |
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* and clang, please do. |
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*/ |
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#define LIKELY(x) (__builtin_expect((x), 1)) |
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#define UNLIKELY(x) (__builtin_expect((x), 0)) |
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/* disable warnings */ |
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/*Like DYNAMIC_BMI2 but for compile time determination of BMI2 support*/ |
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/* compat. with non-clang compilers */ |
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#ifndef __has_builtin |
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# define __has_builtin(x) 0 |
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#endif |
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/* compat. with non-clang compilers */ |
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#ifndef __has_feature |
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# define __has_feature(x) 0 |
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#endif |
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/* C-language Attributes are added in C23. */ |
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#if defined(__STDC_VERSION__) && (__STDC_VERSION__ > 201710L) && defined(__has_c_attribute) |
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# define ZSTD_HAS_C_ATTRIBUTE(x) __has_c_attribute(x) |
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#else |
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# define ZSTD_HAS_C_ATTRIBUTE(x) 0 |
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#endif |
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/* Only use C++ attributes in C++. Some compilers report support for C++ |
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* attributes when compiling with C. |
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*/ |
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#define ZSTD_HAS_CPP_ATTRIBUTE(x) 0 |
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/* Define ZSTD_FALLTHROUGH macro for annotating switch case with the 'fallthrough' attribute. |
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* - C23: https://en.cppreference.com/w/c/language/attributes/fallthrough |
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* - CPP17: https://en.cppreference.com/w/cpp/language/attributes/fallthrough |
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* - Else: __attribute__((__fallthrough__)) |
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*/ |
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#define ZSTD_FALLTHROUGH fallthrough |
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/* detects whether we are being compiled under msan */ |
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/* detects whether we are being compiled under asan */ |
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#endif /* ZSTD_COMPILER_H */
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