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8d3f9e85 | 1 | /* Subtract double values, narrowing the result to float, using soft-fp. |
2b778ceb | 2 | Copyright (C) 2018-2021 Free Software Foundation, Inc. |
8d3f9e85 JM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
8d3f9e85 JM |
18 | |
19 | #define f32subf64 __hide_f32subf64 | |
20 | #define f32subf32x __hide_f32subf32x | |
21 | #define fsubl __hide_fsubl | |
22 | #include <math.h> | |
23 | #undef f32subf64 | |
24 | #undef f32subf32x | |
25 | #undef fsubl | |
26 | ||
27 | #include <math-narrow.h> | |
28 | #include <soft-fp.h> | |
29 | #include <single.h> | |
30 | #include <double.h> | |
31 | ||
32 | float | |
33 | __fsub (double x, double y) | |
34 | { | |
35 | FP_DECL_EX; | |
36 | FP_DECL_D (X); | |
37 | FP_DECL_D (Y); | |
38 | FP_DECL_D (R); | |
39 | FP_DECL_S (RN); | |
40 | float ret; | |
41 | ||
42 | FP_INIT_ROUNDMODE; | |
43 | FP_UNPACK_SEMIRAW_D (X, x); | |
44 | FP_UNPACK_SEMIRAW_D (Y, y); | |
45 | FP_SUB_D (R, X, Y); | |
46 | #if _FP_W_TYPE_SIZE < _FP_FRACBITS_D | |
47 | FP_TRUNC (S, D, 1, 2, RN, R); | |
48 | #else | |
49 | FP_TRUNC (S, D, 1, 1, RN, R); | |
50 | #endif | |
51 | FP_PACK_SEMIRAW_S (ret, RN); | |
52 | FP_HANDLE_EXCEPTIONS; | |
53 | CHECK_NARROW_SUB (ret, x, y); | |
54 | return ret; | |
55 | } | |
56 | libm_alias_float_double (sub) |