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* improvements in compiler function detection.

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This commit is contained in:
IRainman 2025-11-12 14:58:15 +03:00
parent c9d0ac0084
commit 843aa3f703
1 changed files with 53 additions and 2 deletions
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55
include/fast_float/constexpr_feature_detect.h
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@ -7,14 +7,32 @@
#endif
#endif
// Testing for https://wg21.link/N3652, adopted in C++14
#if defined(__cpp_constexpr) && __cpp_constexpr >= 201304
// C++14 constexpr
#if defined(__cpp_constexpr) && __cpp_constexpr >= 201304L
#define FASTFLOAT_CONSTEXPR14 constexpr
#elif __cplusplus >= 201402L
#define FASTFLOAT_CONSTEXPR14 constexpr
#elif defined(_MSC_VER) && _MSC_VER >= 1910 && _MSVC_LANG >= 201402L
#define FASTFLOAT_CONSTEXPR14 constexpr
#else
#define FASTFLOAT_CONSTEXPR14
#endif
// C++14 variable templates
#if defined(__cpp_variable_templates) && __cpp_variable_templates >= 201304L
#define FASTFLOAT_HAS_VARIABLE_TEMPLATES 1
#elif __cplusplus >= 201402L
#define FASTFLOAT_HAS_VARIABLE_TEMPLATES 1
#elif defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 190023918L && \
_MSVC_LANG >= 201402L
#define FASTFLOAT_HAS_VARIABLE_TEMPLATES 1
#else
#define FASTFLOAT_HAS_VARIABLE_TEMPLATES 0
#endif
// C++20 std::bit_cast
#if defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L
#include <bit>
#define FASTFLOAT_HAS_BIT_CAST 1
#else
#define FASTFLOAT_HAS_BIT_CAST 0
@ -35,12 +53,39 @@
#define FASTFLOAT_HAS_BYTESWAP 0
#endif
// C++17 if constexpr
#if defined(__cpp_if_constexpr) && __cpp_if_constexpr >= 201606L
#define FASTFLOAT_IF_CONSTEXPR17(x) if constexpr (x)
#elif defined(__cpp_constexpr) && __cpp_constexpr >= 201603L
#define FASTFLOAT_IF_CONSTEXPR17(x) if constexpr (x)
#elif __cplusplus >= 201703L
#define FASTFLOAT_IF_CONSTEXPR17(x) if constexpr (x)
#elif defined(_MSC_VER) && _MSC_VER >= 1911 && _MSVC_LANG >= 201703L
#define FASTFLOAT_IF_CONSTEXPR17(x) if constexpr (x)
#else
#define FASTFLOAT_IF_CONSTEXPR17(x) if (x)
#endif
// C++17 inline variables
#if defined(__cpp_inline_variables) && __cpp_inline_variables >= 201606L
#define FASTFLOAT_INLINE_VARIABLE inline constexpr
#elif __cplusplus >= 201703L
#define FASTFLOAT_INLINE_VARIABLE inline constexpr
#elif defined(_MSC_VER) && _MSC_VER >= 1912 && _MSVC_LANG >= 201703L
#define FASTFLOAT_INLINE_VARIABLE inline constexpr
#else
#define FASTFLOAT_INLINE_VARIABLE static constexpr
#endif
#if defined(__cpp_lib_is_constant_evaluated) && \
__cpp_lib_is_constant_evaluated >= 201811L
#define FASTFLOAT_HAS_IS_CONSTANT_EVALUATED 1
#define FASTFLOAT_CONSTEVAL consteval
#else
#define FASTFLOAT_HAS_IS_CONSTANT_EVALUATED 0
#define FASTFLOAT_CONSTEVAL FASTFLOAT_CONSTEXPR14
#endif
// Testing for relevant C++20 constexpr library features
#if FASTFLOAT_HAS_IS_CONSTANT_EVALUATED && FASTFLOAT_HAS_BIT_CAST && \
defined(__cpp_lib_constexpr_algorithms) && \
@ -58,6 +103,12 @@
#define FASTFLOAT_DETAIL_MUST_DEFINE_CONSTEXPR_VARIABLE 1
#endif
#if defined(__has_builtin)
#define FASTFLOAT_HAS_BUILTIN(x) __has_builtin(x)
#else
#define FASTFLOAT_HAS_BUILTIN(x) false
#endif
// For support attribute [[assume]] is declared in P1774
#if defined(__cpp_attrubute_assume)
#define FASTFLOAT_ASSUME(expr) [[assume(expr)]]