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ircd::fpe: Add scope_round tool.

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ircd::fpe: Inline exception flag setter.

ircd::fpe: Add fesetround() wrapper.
This commit is contained in:
Jason Volk 2020-08-09 02:10:38 -07:00
parent 4a2adc4123
commit 1baa590d9c
2 changed files with 46 additions and 9 deletions
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47
include/ircd/fpe.h
View file

@ -14,6 +14,7 @@
namespace ircd::fpe
{
struct errors_handle;
struct scope_round;
string_view reflect_sicode(const int &);
string_view reflect(const ushort &flag);
@ -21,9 +22,35 @@ namespace ircd::fpe
[[noreturn]] void _throw_errors(const ushort &flags);
void throw_errors(const ushort &flags);
std::fexcept_t set(const ushort &flag);
void set_round(const std::float_round_style &style);
std::fexcept_t set_excepts(const ushort &flag);
}
/// scope_round
///
struct ircd::fpe::scope_round
{
int theirs
{
std::fegetround()
};
scope_round(const std::float_round_style &ours) noexcept
{
std::fesetround(ours);
}
scope_round(const scope_round &) = delete;
scope_round &operator=(const scope_round &) = delete;
~scope_round() noexcept
{
std::fesetround(theirs);
}
};
/// errors_handle
///
/// Perform a single floating point operation at a time within the scope
/// of fpe::errors_handle. After each operation check the floating point
/// unit for an error status flag and throw a C++ exception.
@ -84,3 +111,21 @@ const
{
return std::fetestexcept(FE_ALL_EXCEPT);
}
//
// ircd::fpe
//
inline std::fexcept_t
ircd::fpe::set_excepts(const ushort &flags)
{
std::fexcept_t theirs;
syscall(std::fesetexceptflag, &theirs, flags);
return theirs;
}
inline void
ircd::fpe::set_round(const std::float_round_style &style)
{
syscall(std::fesetround, style);
}

8
ircd/fpe.cc
View file

@ -12,14 +12,6 @@
#pragma STDC FENV_ACCESS on
#endif
std::fexcept_t
ircd::fpe::set(const ushort &flags)
{
std::fexcept_t theirs;
syscall(std::fesetexceptflag, &theirs, flags);
return theirs;
}
void
ircd::fpe::_throw_errors(const ushort &flags)
{