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1 | /* Software floating-point emulation. |
2 | Truncate IEEE double into bfloat16. | |
3 | Copyright (C) 2022-2024 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 | 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 | <http://www.gnu.org/licenses/>. */ | |
28 | ||
29 | #include "soft-fp.h" | |
30 | #include "brain.h" | |
31 | #include "double.h" | |
32 | ||
33 | BFtype | |
34 | __truncdfbf2 (DFtype a) | |
35 | { | |
36 | FP_DECL_EX; | |
37 | FP_DECL_D (A); | |
38 | FP_DECL_B (R); | |
39 | BFtype 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 (B, D, 1, 2, R, A); | |
45 | #else | |
46 | FP_TRUNC (B, D, 1, 1, R, A); | |
47 | #endif | |
48 | FP_PACK_SEMIRAW_B (r, R); | |
49 | FP_HANDLE_EXCEPTIONS; | |
50 | ||
51 | return r; | |
52 | } |