1/* Software floating-point emulation.
2 (*c) = (*a) * (*b)
3 Copyright (C) 1997-2024 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/* As QP_HANDLE_EXCEPTIONS reloads FPU control word anyway,
21 avoid doing it twice. */
22#define _FP_MUL_MEAT_RESET_FE do {} while (0)
23#include "soft-fp.h"
24#include "quad.h"
25
26void _Qp_mul(long double *c, const long double *a, const long double *b)
27{
28 FP_DECL_EX;
29 FP_DECL_Q(A); FP_DECL_Q(B); FP_DECL_Q(C);
30
31 FP_INIT_ROUNDMODE;
32 FP_UNPACK_QP(A, a);
33 FP_UNPACK_QP(B, b);
34 FP_MUL_Q(C, A, B);
35 FP_PACK_QP(c, C);
36 QP_HANDLE_EXCEPTIONS(
37 _FPU_SETCW(_fcw);
38 __asm (
39" ldd [%1], %%f52\n"
40" ldd [%1+8], %%f54\n"
41" ldd [%2], %%f56\n"
42" ldd [%2+8], %%f58\n"
43" fmulq %%f52, %%f56, %%f60\n"
44" std %%f60, [%0]\n"
45" std %%f62, [%0+8]\n"
46" " : : "r" (c), "r" (a), "r" (b) : QP_CLOBBER));
47}
48

source code of glibc/sysdeps/sparc/sparc64/qp_mul.c