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 #include "quadmath-imp.h"
18 static const __float128 one = 1.0;
21 modfq (__float128 x, __float128 *iptr)
25 GET_FLT128_WORDS64(i0,i1,x);
26 j0 = ((i0>>48)&0x7fff)-0x3fff; /* exponent of x */
27 if(j0<48) { /* integer part in high x */
28 if(j0<0) { /* |x|<1 */
30 SET_FLT128_WORDS64(*iptr,i0&0x8000000000000000ULL,0);
33 i = (0x0000ffffffffffffLL)>>j0;
34 if(((i0&i)|i1)==0) { /* x is integral */
37 SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
40 SET_FLT128_WORDS64(*iptr,i0&(~i),0);
44 } else if (j0>111) { /* no fraction part */
46 /* We must handle NaNs separately. */
47 if (j0 == 0x4000 && ((i0 & 0x0000ffffffffffffLL) | i1))
50 SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
52 } else { /* fraction part in low x */
54 if((i1&i)==0) { /* x is integral */
57 SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0);
60 SET_FLT128_WORDS64(*iptr,i0,i1&(~i));