1 /* Software floating-point emulation.
2 (*c) = (*a) - (*b)
3 Copyright (C) 1997-2022 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20 #include "soft-fp.h"
21 #include "quad.h"
22
_Qp_sub(long double * c,const long double * a,const long double * b)23 void _Qp_sub(long double *c, const long double *a, const long double *b)
24 {
25 FP_DECL_EX;
26 FP_DECL_Q(A); FP_DECL_Q(B); FP_DECL_Q(C);
27
28 FP_INIT_ROUNDMODE;
29 FP_UNPACK_SEMIRAW_QP(A, a);
30 FP_UNPACK_SEMIRAW_QP(B, b);
31 FP_SUB_Q(C, A, B);
32 FP_PACK_SEMIRAW_QP(c, C);
33 QP_HANDLE_EXCEPTIONS(__asm (
34 " ldd [%1], %%f52\n"
35 " ldd [%1+8], %%f54\n"
36 " ldd [%2], %%f56\n"
37 " ldd [%2+8], %%f58\n"
38 " fsubq %%f52, %%f56, %%f60\n"
39 " std %%f60, [%0]\n"
40 " std %%f62, [%0+8]\n"
41 " " : : "r" (c), "r" (a), "r" (b) : QP_CLOBBER));
42 }
43