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Patch from Albert J. Wong to make type_traits take advantage of gcc intrinsics in 4.7 and later. No functionality change when using clang. 

llvm-svn: 211755
This commit is contained in:
Marshall Clow 2014-06-26 01:07:56 +00:00
parent d286dd6413
commit 157a8f91bd
2 changed files with 16 additions and 7 deletions
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11
libcxx/include/__config
View File

@ -339,7 +339,11 @@ typedef __char32_t char32_t;
#endif
#if __has_feature(underlying_type)
# define _LIBCXX_UNDERLYING_TYPE(T) __underlying_type(T)
# define _LIBCPP_UNDERLYING_TYPE(T) __underlying_type(T)
#endif
#if __has_feature(is_literal)
# define _LIBCPP_IS_LITERAL(T) __is_literal(T)
#endif
// Inline namespaces are available in Clang regardless of C++ dialect.
@ -363,6 +367,11 @@ namespace std {
#define _LIBCPP_NORETURN __attribute__((noreturn))
#if _GNUC_VER >= 407
#define _LIBCPP_UNDERLYING_TYPE(T) __underlying_type(T)
#define _LIBCPP_IS_LITERAL(T) __is_literal_type(T)
#endif
#if !__EXCEPTIONS
#define _LIBCPP_NO_EXCEPTIONS
#endif

12
libcxx/include/type_traits
View File

@ -2971,8 +2971,8 @@ template <class _Tp> struct _LIBCPP_TYPE_VIS_ONLY is_pod
// is_literal_type;
template <class _Tp> struct _LIBCPP_TYPE_VIS_ONLY is_literal_type
#if __has_feature(is_literal)
: public integral_constant<bool, __is_literal(_Tp)>
#ifdef _LIBCPP_IS_LITERAL
: public integral_constant<bool, _LIBCPP_IS_LITERAL(_Tp)>
#else
: integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value ||
is_reference<typename remove_all_extents<_Tp>::type>::value>
@ -3363,19 +3363,19 @@ struct __is_nothrow_swappable
#endif // __has_feature(cxx_noexcept)
#ifdef _LIBCXX_UNDERLYING_TYPE
#ifdef _LIBCPP_UNDERLYING_TYPE
template <class _Tp>
struct underlying_type
{
typedef _LIBCXX_UNDERLYING_TYPE(_Tp) type;
typedef _LIBCPP_UNDERLYING_TYPE(_Tp) type;
};
#if _LIBCPP_STD_VER > 11
template <class _Tp> using underlying_type_t = typename underlying_type<_Tp>::type;
#endif
#else // _LIBCXX_UNDERLYING_TYPE
#else // _LIBCPP_UNDERLYING_TYPE
template <class _Tp, bool _Support = false>
struct underlying_type
@ -3385,7 +3385,7 @@ struct underlying_type
"libc++ does not know how to use it.");
};
#endif // _LIBCXX_UNDERLYING_TYPE
#endif // _LIBCPP_UNDERLYING_TYPE
#ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE