1 | /* Square root of long double (ldbl-128) value, narrowing the result to |
2 | double, 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 f32xsqrtf64x __hide_f32xsqrtf64x |
21 | #define f32xsqrtf128 __hide_f32xsqrtf128 |
22 | #define f64sqrtf64x __hide_f64sqrtf64x |
23 | #define f64sqrtf128 __hide_f64sqrtf128 |
24 | #include <math.h> |
25 | #undef f32xsqrtf64x |
26 | #undef f32xsqrtf128 |
27 | #undef f64sqrtf64x |
28 | #undef f64sqrtf128 |
29 | |
30 | #include <math-narrow.h> |
31 | #include <libc-diag.h> |
32 | |
33 | /* Some components of the result's significand and exponent are not |
34 | set in cases where they are not used in packing, but the compiler |
35 | does not see that they are set in all cases where they are used, |
36 | resulting in warnings that they may be used uninitialized. */ |
37 | DIAG_PUSH_NEEDS_COMMENT; |
38 | DIAG_IGNORE_NEEDS_COMMENT (7, "-Wmaybe-uninitialized" ); |
39 | #include <soft-fp.h> |
40 | #include <double.h> |
41 | #include <quad.h> |
42 | |
43 | double |
44 | __dsqrtl (_Float128 x) |
45 | { |
46 | FP_DECL_EX; |
47 | FP_DECL_Q (X); |
48 | FP_DECL_Q (R); |
49 | FP_DECL_D (RN); |
50 | double ret; |
51 | |
52 | FP_INIT_ROUNDMODE; |
53 | FP_UNPACK_Q (X, x); |
54 | FP_SQRT_Q (R, X); |
55 | #if _FP_W_TYPE_SIZE < 64 |
56 | FP_TRUNC_COOKED (D, Q, 2, 4, RN, R); |
57 | #else |
58 | FP_TRUNC_COOKED (D, Q, 1, 2, RN, R); |
59 | #endif |
60 | FP_PACK_D (ret, RN); |
61 | FP_HANDLE_EXCEPTIONS; |
62 | CHECK_NARROW_SQRT (ret, x); |
63 | return ret; |
64 | } |
65 | DIAG_POP_NEEDS_COMMENT; |
66 | |
67 | libm_alias_double_ldouble (sqrt) |
68 | |