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"
33 static const long double one = 1.0;
35 long double __modfl(long double x, long double *iptr)
39 GET_LDOUBLE_WORDS64(i0,i1,x);
40 j0 = ((i0>>48)&0x7fff)-0x3fff; /* exponent of x */
41 if(j0<48) { /* integer part in high x */
42 if(j0<0) { /* |x|<1 */
44 SET_LDOUBLE_WORDS64(*iptr,i0&0x8000000000000000ULL,0);
47 i = (0x0000ffffffffffffLL)>>j0;
48 if(((i0&i)|i1)==0) { /* x is integral */
51 SET_LDOUBLE_WORDS64(x,i0&0x8000000000000000ULL,0);
54 SET_LDOUBLE_WORDS64(*iptr,i0&(~i),0);
58 } else if (j0>111) { /* no fraction part */
60 /* We must handle NaNs separately. */
61 if (j0 == 0x4000 && ((i0 & 0x0000ffffffffffffLL) | i1))
64 SET_LDOUBLE_WORDS64(x,i0&0x8000000000000000ULL,0);
66 } else { /* fraction part in low x */
68 if((i1&i)==0) { /* x is integral */
71 SET_LDOUBLE_WORDS64(x,i0&0x8000000000000000ULL,0);
74 SET_LDOUBLE_WORDS64(*iptr,i0,i1&(~i));
79 weak_alias (__modfl, modfl)