1 /* Software floating-point emulation.
2 Return (double)(*a)
3 Copyright (C) 1997-2017 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Richard Henderson (rth@cygnus.com) and
6 Jakub Jelinek (jj@ultra.linux.cz).
7
8 The GNU C Library is free software; you can redistribute it and/or
9 modify it under the terms of the GNU Lesser General Public
10 License as published by the Free Software Foundation; either
11 version 2.1 of the License, or (at your option) any later version.
12
13 The GNU C Library is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
17
18 You should have received a copy of the GNU Lesser General Public
19 License along with the GNU C Library; if not, see
20 <http://www.gnu.org/licenses/>. */
21
22 #include "soft-fp.h"
23 #include "double.h"
24 #include "quad.h"
25
_Qp_qtod(const long double * a)26 double _Qp_qtod(const long double *a)
27 {
28 FP_DECL_EX;
29 FP_DECL_Q(A);
30 FP_DECL_D(R);
31 double r;
32
33 FP_INIT_ROUNDMODE;
34 FP_UNPACK_SEMIRAW_QP(A, a);
35 #if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q
36 FP_TRUNC(D,Q,2,4,R,A);
37 #else
38 FP_TRUNC(D,Q,1,2,R,A);
39 #endif
40 FP_PACK_SEMIRAW_D(r, R);
41 QP_HANDLE_EXCEPTIONS(__asm (
42 " ldd [%1], %%f52\n"
43 " ldd [%1+8], %%f54\n"
44 " fqtod %%f52, %0\n"
45 " " : "=&e" (r) : "r" (a) : QP_CLOBBER));
46
47 return r;
48 }
49