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[UCRT:MATH] Implement _dclass, _fdclass

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This commit is contained in:
Timo Kreuzer 2024-11-15 16:53:39 +02:00
parent 0133dba0c6
commit 59c55e003e
3 changed files with 98 additions and 0 deletions
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48
sdk/lib/ucrt/math/_dclass.c Normal file
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//
// _dclass.c
//
// Copyright (c) 2024 Timo Kreuzer
//
// Implementation of _dclass.
//
// SPDX-License-Identifier: MIT
//
#include <math.h>
#include <stdint.h>
#ifdef _MSC_VER
#pragma function(_dclass)
#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
_dclass(_In_ double _X)
{
union { double f; uint64_t ui64; } u = { _X };
uint64_t e = u.ui64 & 0x7FF0000000000000ull;
uint64_t m = u.ui64 & 0x000FFFFFFFFFFFFFull;
if (e == 0x7FF0000000000000ull)
{
return m ? FP_NAN : FP_INFINITE;
}
else if (e == 0)
{
return m ? FP_SUBNORMAL : FP_ZERO;
}
else
{
return FP_NORMAL;
}
}

48
sdk/lib/ucrt/math/_fdclass.c Normal file
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//
// _fdclass.c
//
// Copyright (c) 2024 Timo Kreuzer
//
// Implementation of _fdclass.
//
// SPDX-License-Identifier: MIT
//
#include <math.h>
#include <stdint.h>
#ifdef _MSC_VER
#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;
}
}

2
sdk/lib/ucrt/math/math.cmake
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@ -1,4 +1,6 @@
list(APPEND UCRT_MATH_SOURCES
math/_dclass.c
math/_fdclass.c
math/matherr.cpp
)