1 /* Subtract double values, narrowing the result to float, using soft-fp.
2 Copyright (C) 2018-2022 Free Software Foundation, Inc.
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
17 <https://www.gnu.org/licenses/>. */
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
__fsub(double x,double y)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)
57