1 /* Software floating-point emulation.
2 (*c) = (*a) - (*b)
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 "quad.h"
24
_Qp_sub(long double * c,const long double * a,const long double * b)25 void _Qp_sub(long double *c, const long double *a, const long double *b)
26 {
27 FP_DECL_EX;
28 FP_DECL_Q(A); FP_DECL_Q(B); FP_DECL_Q(C);
29
30 FP_INIT_ROUNDMODE;
31 FP_UNPACK_SEMIRAW_QP(A, a);
32 FP_UNPACK_SEMIRAW_QP(B, b);
33 FP_SUB_Q(C, A, B);
34 FP_PACK_SEMIRAW_QP(c, C);
35 QP_HANDLE_EXCEPTIONS(__asm (
36 " ldd [%1], %%f52\n"
37 " ldd [%1+8], %%f54\n"
38 " ldd [%2], %%f56\n"
39 " ldd [%2+8], %%f58\n"
40 " fsubq %%f52, %%f56, %%f60\n"
41 " std %%f60, [%0]\n"
42 " std %%f62, [%0+8]\n"
43 " " : : "r" (c), "r" (a), "r" (b) : QP_CLOBBER));
44 }
45