178 lines
5.7 KiB
C
178 lines
5.7 KiB
C
/*
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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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