mirror of
https://github.com/matrix-construct/construct
synced 2024-12-25 23:14:13 +01:00
131 lines
2.6 KiB
C++
131 lines
2.6 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_FPE_H
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namespace ircd::fpe
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{
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struct errors_handle;
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struct scope_round;
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string_view reflect_sicode(const int &);
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string_view reflect(const ushort &flag);
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string_view reflect(const mutable_buffer &, const ushort &flags);
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[[noreturn]] void _throw_errors(const ushort &flags);
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void throw_errors(const ushort &flags);
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void set_round(const std::float_round_style &style);
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std::fexcept_t set_excepts(const ushort &flag);
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}
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/// scope_round
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///
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struct ircd::fpe::scope_round
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{
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int theirs
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{
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std::fegetround()
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};
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scope_round(const std::float_round_style &ours) noexcept
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{
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std::fesetround(ours);
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}
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scope_round(const scope_round &) = delete;
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scope_round &operator=(const scope_round &) = delete;
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~scope_round() noexcept
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{
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std::fesetround(theirs);
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}
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};
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/// errors_handle
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///
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/// Perform a single floating point operation at a time within the scope
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/// of fpe::errors_handle. After each operation check the floating point
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/// unit for an error status flag and throw a C++ exception.
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struct ircd::fpe::errors_handle
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{
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std::fexcept_t theirs;
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public:
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ushort pending() const;
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void throw_pending() const;
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void clear_pending();
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errors_handle();
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~errors_handle() noexcept(false);
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};
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[[gnu::always_inline]] inline
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ircd::fpe::errors_handle::errors_handle()
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{
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syscall(std::fegetexceptflag, &theirs, FE_ALL_EXCEPT);
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clear_pending();
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}
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[[gnu::always_inline]] inline
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ircd::fpe::errors_handle::~errors_handle()
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noexcept(false)
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{
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const unwind reset{[this]
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{
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syscall(std::fesetexceptflag, &theirs, FE_ALL_EXCEPT);
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}};
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throw_pending();
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}
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inline void
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ircd::fpe::errors_handle::clear_pending()
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{
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syscall(std::feclearexcept, FE_ALL_EXCEPT);
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}
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inline void
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ircd::fpe::errors_handle::throw_pending()
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const
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{
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const auto pending
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{
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this->pending()
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};
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if(unlikely(pending))
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_throw_errors(pending);
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}
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inline ushort
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ircd::fpe::errors_handle::pending()
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const
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{
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return std::fetestexcept(FE_ALL_EXCEPT);
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}
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//
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// ircd::fpe
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//
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inline std::fexcept_t
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ircd::fpe::set_excepts(const ushort &flags)
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{
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std::fexcept_t theirs;
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syscall(std::fesetexceptflag, &theirs, flags);
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return theirs;
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}
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inline void
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ircd::fpe::set_round(const std::float_round_style &style)
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{
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syscall(std::fesetround, style);
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}
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