mirror of
https://github.com/reactos/reactos.git
synced 2025-07-03 05:01:21 +00:00
48 lines
1,005 B
C
48 lines
1,005 B
C
//
|
|
// _fdclass.c
|
|
//
|
|
// Copyright (c) 2024 Timo Kreuzer
|
|
//
|
|
// Implementation of _fdclass.
|
|
//
|
|
// SPDX-License-Identifier: MIT
|
|
//
|
|
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1922)
|
|
#pragma function(_fdclass)
|
|
#endif
|
|
|
|
//
|
|
// Returns the floating-point classification of _X.
|
|
//
|
|
// FP_NAN - A quiet, signaling, or indeterminate NaN
|
|
// FP_INFINITE - A positive or negative infinity
|
|
// FP_NORMAL - A positive or negative normalized non-zero value
|
|
// FP_SUBNORMAL - A positive or negative subnormal (denormalized) value
|
|
// FP_ZERO - A positive or negative zero value
|
|
//
|
|
_Check_return_
|
|
short
|
|
__cdecl
|
|
_fdclass(_In_ float _X)
|
|
{
|
|
union { float f; uint32_t ui32; } u = { _X };
|
|
uint32_t e = u.ui32 & 0x7F800000u;
|
|
uint32_t m = u.ui32 & 0x007FFFFFu;
|
|
|
|
if (e == 0x7F800000u)
|
|
{
|
|
return m ? FP_NAN : FP_INFINITE;
|
|
}
|
|
else if (e == 0)
|
|
{
|
|
return m ? FP_SUBNORMAL : FP_ZERO;
|
|
}
|
|
else
|
|
{
|
|
return FP_NORMAL;
|
|
}
|
|
}
|