mirror of
https://github.com/reactos/reactos.git
synced 2024-08-22 03:12:51 +00:00
88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
/* @(#)s_modf.c 1.3 95/01/18 */
|
|
/*
|
|
* ====================================================
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
* Developed at SunSoft, a Sun Microsystems, Inc. business.
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software is freely granted, provided that this notice
|
|
* is preserved.
|
|
* ====================================================
|
|
*/
|
|
#define modfl _dummy_modfl
|
|
#include <precomp.h>
|
|
#undef modfl
|
|
|
|
//static const double one = 1.0;
|
|
|
|
|
|
|
|
long double modfl(long double __x, long double *__i)
|
|
{
|
|
union
|
|
{
|
|
long double* __x;
|
|
long_double_s* x;
|
|
} x;
|
|
union
|
|
{
|
|
long double* __i;
|
|
long_double_s* iptr;
|
|
} iptr;
|
|
|
|
int j0;
|
|
unsigned int i;
|
|
|
|
x.__x = &__x;
|
|
iptr.__i = __i;
|
|
|
|
|
|
j0 = x.x->exponent - 0x3fff; /* exponent of x */
|
|
|
|
if(j0<32) { /* integer part in high x */
|
|
if(j0<0) { /* |x|<1 */
|
|
*__i = 0.0L;
|
|
iptr.iptr->sign = x.x->sign;
|
|
return __x;
|
|
} else {
|
|
|
|
i = ((unsigned int)(0xffffffff))>>(j0+1);
|
|
if ( x.x->mantissal == 0 && (x.x->mantissal & i) == 0 ) {
|
|
*__i = __x;
|
|
__x = 0.0L;
|
|
x.x->sign = iptr.iptr->sign;
|
|
return __x;
|
|
}
|
|
iptr.iptr->sign = x.x->sign;
|
|
iptr.iptr->exponent = x.x->exponent;
|
|
iptr.iptr->mantissah = x.x->mantissah&((~i));
|
|
iptr.iptr->mantissal = 0;
|
|
|
|
return __x - *__i;
|
|
}
|
|
} else if (j0>63) { /* no fraction part */
|
|
*__i = __x;
|
|
if ( _isnanl(__x) || _isinfl(__x) )
|
|
return __x;
|
|
|
|
__x = 0.0L;
|
|
x.x->sign = iptr.iptr->sign;
|
|
return __x;
|
|
} else { /* fraction part in low x */
|
|
|
|
i = ((unsigned int)(0xffffffff))>>(j0-32);
|
|
if ( x.x->mantissal == 0 ) {
|
|
*__i = __x;
|
|
__x = 0.0L;
|
|
x.x->sign = iptr.iptr->sign;
|
|
return __x;
|
|
}
|
|
iptr.iptr->sign = x.x->sign;
|
|
iptr.iptr->exponent = x.x->exponent;
|
|
iptr.iptr->mantissah = x.x->mantissah;
|
|
iptr.iptr->mantissal = x.x->mantissal&(~i);
|
|
|
|
return __x - *__i;
|
|
}
|
|
}
|