attributes.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2019 Tobias Hienzsch
 
#ifndef TETL_CONFIG_ATTRIBUTES_HPP
#define TETL_CONFIG_ATTRIBUTES_HPP
 
#if __has_attribute(always_inline)
    #define TETL_ALWAYS_INLINE [[gnu::always_inline]]
#elif defined(_MSC_VER)
    #define TETL_ALWAYS_INLINE [[msvc::forceinline]]
#else
    #define TETL_ALWAYS_INLINE
#endif
 
#if __has_attribute(noinline)
    #define TETL_NO_INLINE [[gnu::noinline]]
#elif defined(_MSC_VER)
    #define TETL_NO_INLINE [[msvc::noinline]]
#else
    #define TETL_NO_INLINE
#endif
 
#if __has_attribute(cold)
    #define TETL_COLD [[gnu::cold]]
#else
    #define TETL_COLD
#endif
 
#if defined(__GNUC__) or defined(__clang__)
    #define TETL_MAY_ALIAS [[gnu::may_alias]]
#else
    #define TETL_MAY_ALIAS
#endif
 
#if defined(_MSC_VER) and not defined(__clang__)
    #define TETL_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]
#elif defined(_MSC_VER) and defined(__clang__) and (__clang_major__ >= 18)
    #define TETL_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]
#elif defined(_MSC_VER) and defined(__clang__)
    #define TETL_NO_UNIQUE_ADDRESS
#else
    #define TETL_NO_UNIQUE_ADDRESS [[no_unique_address]]
#endif
 
#if defined(__clang__)
    #define TETL_TRIVIAL_ABI [[clang::trivial_abi]]
#else
    #define TETL_TRIVIAL_ABI
#endif
 
#if defined(__clang__)
    #define TETL_NO_UNROLL _Pragma("nounroll")
#elif defined(__GNUC__)
    // TODO: _Pragma("GCC unroll 0") should work, but causes 'error: ignoring loop annotation'
    // when used in class templates
    #define TETL_NO_UNROLL /*_Pragma("GCC unroll 0")*/
#else
    #define TETL_NO_UNROLL
#endif
 
#endif // TETL_CONFIG_ATTRIBUTES_HPP