1 | /* Fused multiply-add of double values, narrowing the result to float, |
2 | using soft-fp. |
3 | Copyright (C) 2021-2024 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 | #define f32fmaf64 __hide_f32fmaf64 |
21 | #define f32fmaf32x __hide_f32fmaf32x |
22 | #define ffmal __hide_ffmal |
23 | #include <math.h> |
24 | #undef f32fmaf64 |
25 | #undef f32fmaf32x |
26 | #undef ffmal |
27 | |
28 | #include <math-narrow.h> |
29 | #include <libc-diag.h> |
30 | |
31 | /* R_e is not set in cases where it is not used in packing, but the |
32 | compiler does not see that it is set in all cases where it is |
33 | used, resulting in warnings that it may be used uninitialized. |
34 | The location of the warning differs in different versions of GCC, |
35 | it may be where R is defined using a macro or it may be where the |
36 | macro is defined. */ |
37 | DIAG_PUSH_NEEDS_COMMENT; |
38 | DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wmaybe-uninitialized" ); |
39 | |
40 | #include <soft-fp.h> |
41 | #include <single.h> |
42 | #include <double.h> |
43 | |
44 | float |
45 | __ffma (double x, double y, double z) |
46 | { |
47 | FP_DECL_EX; |
48 | FP_DECL_D (X); |
49 | FP_DECL_D (Y); |
50 | FP_DECL_D (Z); |
51 | FP_DECL_D (R); |
52 | FP_DECL_S (RN); |
53 | float ret; |
54 | |
55 | FP_INIT_ROUNDMODE; |
56 | FP_UNPACK_D (X, x); |
57 | FP_UNPACK_D (Y, y); |
58 | FP_UNPACK_D (Z, z); |
59 | FP_FMA_D (R, X, Y, Z); |
60 | #if _FP_W_TYPE_SIZE < _FP_FRACBITS_D |
61 | FP_TRUNC_COOKED (S, D, 1, 2, RN, R); |
62 | #else |
63 | FP_TRUNC_COOKED (S, D, 1, 1, RN, R); |
64 | #endif |
65 | FP_PACK_S (ret, RN); |
66 | FP_HANDLE_EXCEPTIONS; |
67 | CHECK_NARROW_FMA (ret, x, y, z); |
68 | return ret; |
69 | } |
70 | DIAG_POP_NEEDS_COMMENT; |
71 | |
72 | libm_alias_float_double (fma) |
73 | |