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8d3f9e85 JM |
1 | /* Subtract long double (ldbl-128) values, narrowing the result to |
2 | float, using soft-fp. | |
04277e02 | 3 | Copyright (C) 2018-2019 Free Software Foundation, Inc. |
8d3f9e85 JM |
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 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #define f32subf64x __hide_f32subf64x | |
21 | #define f32subf128 __hide_f32subf128 | |
22 | #include <math.h> | |
23 | #undef f32subf64x | |
24 | #undef f32subf128 | |
25 | ||
26 | #include <math-narrow.h> | |
27 | #include <soft-fp.h> | |
28 | #include <single.h> | |
29 | #include <quad.h> | |
30 | ||
31 | float | |
32 | __fsubl (_Float128 x, _Float128 y) | |
33 | { | |
34 | FP_DECL_EX; | |
35 | FP_DECL_Q (X); | |
36 | FP_DECL_Q (Y); | |
37 | FP_DECL_Q (R); | |
38 | FP_DECL_S (RN); | |
39 | float ret; | |
40 | ||
41 | FP_INIT_ROUNDMODE; | |
42 | FP_UNPACK_SEMIRAW_Q (X, x); | |
43 | FP_UNPACK_SEMIRAW_Q (Y, y); | |
44 | FP_SUB_Q (R, X, Y); | |
45 | #if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q | |
46 | FP_TRUNC (S, Q, 1, 4, RN, R); | |
47 | #else | |
48 | FP_TRUNC (S, Q, 1, 2, RN, R); | |
49 | #endif | |
50 | FP_PACK_SEMIRAW_S (ret, RN); | |
51 | FP_HANDLE_EXCEPTIONS; | |
52 | CHECK_NARROW_SUB (ret, x, y); | |
53 | return ret; | |
54 | } | |
55 | libm_alias_float_ldouble (sub) |