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Edit File : assume.h \| Size : 2.50 KB
#ifndef RUBY_BACKWARD2_ASSUME_H /--C++--vi:se ft=cpp:/ #define RUBY_BACKWARD2_ASSUME_H /** * @file * @author Ruby developers <ruby-core@ruby-lang.org> * @copyright This file is a part of the programming language Ruby. * Permission is hereby granted, to either redistribute and/or * modify this file, provided that the conditions mentioned in the * file COPYING are met. Consult the file for details. * @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are * implementation details. Don't take them as canon. They could * rapidly appear then vanish. The name (path) of this header file * is also an implementation detail. Do not expect it to persist * at the place it is now. Developers are free to move it anywhere * anytime at will. * @note To ruby-core: remember that this header can be possibly * recursively included from extension libraries written in C++. * Do not expect for instance `__VA_ARGS__` is always available. * We assume C99 for ruby itself but we don't assume languages of * extension libraries. They could be written in C++98. * @brief Defines #ASSUME / #RB_LIKELY / #UNREACHABLE / #include "ruby/internal/config.h" #include "ruby/internal/assume.h" #include "ruby/internal/has/builtin.h" #define ASSUME RBIMPL_ASSUME /< @old{RBIMPL_ASSUME} / #define UNREACHABLE RBIMPL_UNREACHABLE() /*< @old{RBIMPL_UNREACHABLE} / #define UNREACHABLE_RETURN RBIMPL_UNREACHABLE_RETURN /*< @old{RBIMPL_UNREACHABLE_RETURN} / /* likely / #if RBIMPL_HAS_BUILTIN(__builtin_expect) /* * Asserts that the given Boolean expression likely holds. * * @param x An expression that likely holds. * * @note Consider this macro carefully. It has been here since when CPUs were * like babies, but contemporary processors are beasts. They are * smarter than mare mortals like us today. Their branch predictions * highly expectedly outperform your use of this macro. / # define RB_LIKELY(x) (__builtin_expect(!!(x), 1)) /* * Asserts that the given Boolean expression likely doesn't hold. * * @param x An expression that likely doesn't hold. / # define RB_UNLIKELY(x) (__builtin_expect(!!(x), 0)) #else # define RB_LIKELY(x) (x) # define RB_UNLIKELY(x) (x) #endif #endif / RUBY_BACKWARD2_ASSUME_H */ Back

Edit File : assume.h | Size : 2.50 KB

#ifndef RUBY_BACKWARD2_ASSUME_H                      /*-*-C++-*-vi:se ft=cpp:*/
#define RUBY_BACKWARD2_ASSUME_H
/**
 * @file
 * @author     Ruby developers <ruby-core@ruby-lang.org>
 * @copyright  This  file  is   a  part  of  the   programming  language  Ruby.
 *             Permission  is hereby  granted,  to  either redistribute  and/or
 *             modify this file, provided that  the conditions mentioned in the
 *             file COPYING are met.  Consult the file for details.
 * @warning    Symbols   prefixed  with   either  `RBIMPL`   or  `rbimpl`   are
 *             implementation details.   Don't take  them as canon.  They could
 *             rapidly appear then vanish.  The name (path) of this header file
 *             is also an  implementation detail.  Do not expect  it to persist
 *             at the place it is now.  Developers are free to move it anywhere
 *             anytime at will.
 * @note       To  ruby-core:  remember  that   this  header  can  be  possibly
 *             recursively included  from extension  libraries written  in C++.
 *             Do not  expect for  instance `__VA_ARGS__` is  always available.
 *             We assume C99  for ruby itself but we don't  assume languages of
 *             extension libraries.  They could be written in C++98.
 * @brief      Defines #ASSUME / #RB_LIKELY / #UNREACHABLE
 */
#include "ruby/internal/config.h"
#include "ruby/internal/assume.h"
#include "ruby/internal/has/builtin.h"

#define ASSUME             RBIMPL_ASSUME             /**< @old{RBIMPL_ASSUME} */
#define UNREACHABLE        RBIMPL_UNREACHABLE()      /**< @old{RBIMPL_UNREACHABLE} */
#define UNREACHABLE_RETURN RBIMPL_UNREACHABLE_RETURN /**< @old{RBIMPL_UNREACHABLE_RETURN} */

/* likely */
#if RBIMPL_HAS_BUILTIN(__builtin_expect)
/**
 * Asserts that the given Boolean expression likely holds.
 *
 * @param  x  An expression that likely holds.
 *
 * @note  Consider this macro carefully.  It has been here since when CPUs were
 *        like  babies,  but  contemporary  processors are  beasts.   They  are
 *        smarter than  mare mortals like  us today.  Their  branch predictions
 *        highly expectedly outperform your use of this macro.
 */
# define RB_LIKELY(x)   (__builtin_expect(!!(x), 1))

/**
 * Asserts that the given Boolean expression likely doesn't hold.
 *
 * @param  x  An expression that likely doesn't hold.
 */
# define RB_UNLIKELY(x) (__builtin_expect(!!(x), 0))
#else
# define RB_LIKELY(x)   (x)
# define RB_UNLIKELY(x) (x)
#endif

#endif /* RUBY_BACKWARD2_ASSUME_H */

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