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Forward the (un)likely expression being cast to bool

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This commit is contained in:
Chris Robinson 2022-02-24 06:43:14 -08:00
parent b1559227b0
commit 843a5aac6b
1 changed files with 7 additions and 4 deletions
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11
common/opthelpers.h
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@ -1,6 +1,9 @@
#ifndef OPTHELPERS_H
#define OPTHELPERS_H
#include <utility>
#ifdef __has_builtin
#define HAS_BUILTIN __has_builtin
#else
@ -14,20 +17,20 @@
*/
template<typename T>
constexpr bool likely(T&& expr) noexcept
{ return __builtin_expect(static_cast<bool>(expr), true); }
{ return __builtin_expect(static_cast<bool>(std::forward<T>(expr)), true); }
/* The opposite of likely(), optimizing for the case where the condition is
* false.
*/
template<typename T>
constexpr bool unlikely(T&& expr) noexcept
{ return __builtin_expect(static_cast<bool>(expr), false); }
{ return __builtin_expect(static_cast<bool>(std::forward<T>(expr)), false); }
#else
template<typename T>
constexpr bool likely(T&& expr) noexcept { return static_cast<bool>(expr); }
constexpr bool likely(T&& expr) noexcept { return static_cast<bool>(std::forward<T>(expr)); }
template<typename T>
constexpr bool unlikely(T&& expr) noexcept { return static_cast<bool>(expr); }
constexpr bool unlikely(T&& expr) noexcept { return static_cast<bool>(std::forward<T>(expr)); }
#endif
#define LIKELY(x) (likely(x))
#define UNLIKELY(x) (unlikely(x))