1 /* Software floating-point emulation.
2 Truncate IEEE double into IEEE single
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 In addition to the permissions in the GNU Lesser General Public
12 License, the Free Software Foundation gives you unlimited
13 permission to link the compiled version of this file into
14 combinations with other programs, and to distribute those
15 combinations without any restriction coming from the use of this
16 file. (The Lesser General Public License restrictions do apply in
17 other respects; for example, they cover modification of the file,
18 and distribution when not linked into a combine executable.)
19
20 The GNU C Library is distributed in the hope that it will be useful,
21 but WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 Lesser General Public License for more details.
24
25 You should have received a copy of the GNU Lesser General Public
26 License along with the GNU C Library; if not, see
27 <https://www.gnu.org/licenses/>. */
28
29 #include "soft-fp.h"
30 #include "single.h"
31 #include "double.h"
32
33 SFtype
__truncdfsf2(DFtype a)34 __truncdfsf2 (DFtype a)
35 {
36 FP_DECL_EX;
37 FP_DECL_D (A);
38 FP_DECL_S (R);
39 SFtype r;
40
41 FP_INIT_ROUNDMODE;
42 FP_UNPACK_SEMIRAW_D (A, a);
43 #if _FP_W_TYPE_SIZE < _FP_FRACBITS_D
44 FP_TRUNC (S, D, 1, 2, R, A);
45 #else
46 FP_TRUNC (S, D, 1, 1, R, A);
47 #endif
48 FP_PACK_SEMIRAW_S (r, R);
49 FP_HANDLE_EXCEPTIONS;
50
51 return r;
52 }
53