1 /* s_modfl.c -- long double version of s_modf.c.
2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
13 * ====================================================
16 #if defined(LIBM_SCCS) && !defined(lint)
17 static char rcsid
[] = "$NetBSD: $";
21 * modfl(long double x, long double *iptr)
22 * return fraction part of x, and return x's integral part in *iptr.
31 #include "math_private.h"
34 static const long double one
= 1.0;
36 static long double one
= 1.0;
40 long double __modfl(long double x
, long double *iptr
)
42 long double __modfl(x
, iptr
)
48 GET_LDOUBLE_WORDS64(i0
,i1
,x
);
49 j0
= ((i0
>>48)&0x7fff)-0x3fff; /* exponent of x */
50 if(j0
<48) { /* integer part in high x */
51 if(j0
<0) { /* |x|<1 */
53 SET_LDOUBLE_WORDS64(*iptr
,i0
&0x8000000000000000ULL
,0);
56 i
= (0x0000ffffffffffffLL
)>>j0
;
57 if(((i0
&i
)|i1
)==0) { /* x is integral */
60 SET_LDOUBLE_WORDS64(x
,i0
&0x8000000000000000ULL
,0);
63 SET_LDOUBLE_WORDS64(*iptr
,i0
&(~i
),0);
67 } else if (j0
>111) { /* no fraction part */
69 /* We must handle NaNs separately. */
70 if (j0
== 0x4000 && ((i0
& 0x0000ffffffffffffLL
) | i1
))
73 SET_LDOUBLE_WORDS64(x
,i0
&0x8000000000000000ULL
,0);
75 } else { /* fraction part in low x */
77 if((i1
&i
)==0) { /* x is integral */
80 SET_LDOUBLE_WORDS64(x
,i0
&0x8000000000000000ULL
,0);
83 SET_LDOUBLE_WORDS64(*iptr
,i0
,i1
&(~i
));
88 weak_alias (__modfl
, modfl
)