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[CRT:MATH] Implement _isnan and _isnanf

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This commit is contained in:
Timo Kreuzer 2024-11-15 16:36:19 +02:00
parent e01231bd49
commit 3f71ab80ad
6 changed files with 37 additions and 43 deletions
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4
sdk/lib/crt/float/float.cmake
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@ -1,8 +1,4 @@
list(APPEND LIBCNTPR_FLOAT_SOURCE
float/isnan.c
)
list(APPEND CRT_FLOAT_SOURCE
${LIBCNTPR_FLOAT_SOURCE}
float/chgsign.c

38
sdk/lib/crt/float/isnan.c
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@ -1,38 +0,0 @@
/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <precomp.h>
#if defined(_MSC_VER) && defined(_M_ARM)
#pragma function(_isnan)
#endif /* _MSC_VER */
/*
* @implemented
*/
int CDECL _isnan(double __x)
{
union
{
double* __x;
double_s* x;
} x;
x.__x = &__x;
return ( x.x->exponent == 0x7ff && ( x.x->mantissah != 0 || x.x->mantissal != 0 ));
}