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[CRT:MATH] Move some math functions from ucrt to crt

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This commit is contained in:
Timo Kreuzer 2025-05-11 12:02:39 +03:00
parent a9ee20cb9a
commit b734e3ba63
8 changed files with 64 additions and 68 deletions
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46
sdk/lib/crt/math/_dclass.c Normal file
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/*
* PROJECT: ReactOS CRT
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Implementation of _dclass.
* COPYRIGHT: Copyright 2025 Timo Kreuzer <timo.kreuzer@reactos.org>
*/
#include <math.h>
#include <stdint.h>
#if defined(_MSC_VER) && (_MSC_VER >= 1922)
_Check_return_ short __cdecl _dclass(_In_ double _X);
#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;
}
}