1 /* Square root of double value, narrowing the result to float, using soft-fp.
2 Copyright (C) 2021-2022 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 f32sqrtf64 __hide_f32sqrtf64
20 #define f32sqrtf32x __hide_f32sqrtf32x
21 #define fsqrtl __hide_fsqrtl
22 #include <math.h>
23 #undef f32sqrtf64
24 #undef f32sqrtf32x
25 #undef fsqrtl
26
27 #include <math-narrow.h>
28 #include <soft-fp.h>
29 #include <single.h>
30 #include <double.h>
31
32 float
__fsqrt(double x)33 __fsqrt (double x)
34 {
35 FP_DECL_EX;
36 FP_DECL_D (X);
37 FP_DECL_D (R);
38 FP_DECL_S (RN);
39 float ret;
40
41 FP_INIT_ROUNDMODE;
42 FP_UNPACK_D (X, x);
43 FP_SQRT_D (R, X);
44 #if _FP_W_TYPE_SIZE < _FP_FRACBITS_D
45 FP_TRUNC_COOKED (S, D, 1, 2, RN, R);
46 #else
47 FP_TRUNC_COOKED (S, D, 1, 1, RN, R);
48 #endif
49 FP_PACK_S (ret, RN);
50 FP_HANDLE_EXCEPTIONS;
51 CHECK_NARROW_SQRT (ret, x);
52 return ret;
53 }
54 libm_alias_float_double (sqrt)
55