1 | /* Multiply long double (ldbl-128) values, narrowing the result to |
2 | double, using soft-fp. |
3 | Copyright (C) 2018-2022 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 | #define f32xmulf64x __hide_f32xmulf64x |
21 | #define f32xmulf128 __hide_f32xmulf128 |
22 | #define f64mulf64x __hide_f64mulf64x |
23 | #define f64mulf128 __hide_f64mulf128 |
24 | #include <math.h> |
25 | #undef f32xmulf64x |
26 | #undef f32xmulf128 |
27 | #undef f64mulf64x |
28 | #undef f64mulf128 |
29 | |
30 | #include <math-narrow.h> |
31 | #include <soft-fp.h> |
32 | #include <double.h> |
33 | #include <quad.h> |
34 | |
35 | double |
36 | __dmull (_Float128 x, _Float128 y) |
37 | { |
38 | FP_DECL_EX; |
39 | FP_DECL_Q (X); |
40 | FP_DECL_Q (Y); |
41 | FP_DECL_Q (R); |
42 | FP_DECL_D (RN); |
43 | double ret; |
44 | |
45 | FP_INIT_ROUNDMODE; |
46 | FP_UNPACK_Q (X, x); |
47 | FP_UNPACK_Q (Y, y); |
48 | FP_MUL_Q (R, X, Y); |
49 | #if _FP_W_TYPE_SIZE < 64 |
50 | FP_TRUNC_COOKED (D, Q, 2, 4, RN, R); |
51 | #else |
52 | FP_TRUNC_COOKED (D, Q, 1, 2, RN, R); |
53 | #endif |
54 | FP_PACK_D (ret, RN); |
55 | FP_HANDLE_EXCEPTIONS; |
56 | CHECK_NARROW_MUL (ret, x, y); |
57 | return ret; |
58 | } |
59 | libm_alias_double_ldouble (mul) |
60 | |