#pragma once #ifdef _MSC_VER # include # define LIKELY(x) (x) # define UNLIKELY(x) (x) # define EIGHTBIT_PARITY(x) (__popcnt(value) % 2) # define UNREACHABLE __assume(0) #elif definef(__GNUG__) # include # define LIKELY(x) __builtin_expect(!!(x), 1) # define UNLIKELY(x) __builtin_expect(!!(x), 0) # define EIGHTBIT_PARITY(x) __builtin_parity(value) # define UNREACHABLE __builtin_unreachable(); #else # error Unknown compiler #endif