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add: [imp] LIBIMP_ASSUME

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mutouyun 2022-12-25 14:27:24 +08:00
parent f8fdfb0f57
commit ee04080e29
1 changed files with 22 additions and 0 deletions
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22
include/libimp/detect_plat.h
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@ -44,6 +44,9 @@
# define LIBIMP_CC_MSVC_2019 1920
#elif defined(__GNUC__)
# define LIBIMP_CC_GNUC __GNUC__
# if defined(__clang__)
# define LIBIMP_CC_CLANG
#endif
#else
# error "This compiler is unsupported."
#endif
@ -103,6 +106,7 @@
#endif
/// \brief C++ attributes.
/// \see https://en.cppreference.com/w/cpp/language/attributes
#if defined(__has_cpp_attribute)
# if __has_cpp_attribute(fallthrough)
@ -120,6 +124,9 @@
# if __has_cpp_attribute(nodiscard)
# define LIBIMP_NODISCARD [[nodiscard]]
# endif
# if __has_cpp_attribute(assume)
# define LIBIMP_ASSUME(...) [[assume(__VA_ARGS__)]]
# endif
#endif
#if !defined(LIBIMP_FALLTHROUGH)
@ -175,6 +182,21 @@
# endif
#endif
#if !defined(LIBIMP_ASSUME)
# if defined(LIBIMP_CC_CLANG) && __has_builtin(__builtin_assume)
/// \see https://clang.llvm.org/docs/LanguageExtensions.html#langext-builtin-assume
# define LIBIMP_ASSUME(...) __builtin_assume(__VA_ARGS__)
# elif defined(LIBIMP_CC_GNUC) && __has_builtin(__builtin_unreachable)
/// \see https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005funreachable
# define LIBIMP_ASSUME(...) do { if (!(__VA_ARGS__)) __builtin_unreachable(); } while (false)
# elif defined(LIBIMP_CC_MSVC)
/// \see https://learn.microsoft.com/en-us/cpp/intrinsics/assume?view=msvc-140
# define LIBIMP_ASSUME(...) __assume(__VA_ARGS__)
# else
# define LIBIMP_ASSUME(...)
# endif
#endif
/// \see https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_exceptions.html
/// https://learn.microsoft.com/en-us/cpp/preprocessor/predefined-macros
/// https://stackoverflow.com/questions/6487013/programmatically-determine-whether-exceptions-are-enabled