1 /* 64-bit floating point to 128-bit floating point.
2 Copyright (C) 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #include <quad_float.h>
22 /* long double _q_dtoq(double a);
23 Convert 'a' to long double. Don't raise exceptions.
27 __q_dtoq(unsigned long long result[2], double a)
36 result[1] = u.u << 64-4;
38 /* correct exponent bias */
39 rx = ((long long)u.u >> 52 & 0x87ff) + 16383-1023;
41 ux = u.u >> 52 & 0x7ff;
44 if ((u.u & 0x7fffffffffffffffULL) == 0)
51 /* Denormalised number. Renormalise. */
52 unsigned long long um = u.u & 0x000fffffffffffffULL;
53 int cs = cntlzd(um) - 12 + 1;
57 result[1] = um << 64-4;
65 *(unsigned short *)result = rx;