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a1d3c9b6 | 1 | /* Euclidean distance function. Double/Binary64 i386 version. |
6d7e8eda | 2 | Copyright (C) 2021-2023 Free Software Foundation, Inc. |
a1d3c9b6 AZ |
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 | #include <math.h> | |
20 | #include <math_private.h> | |
21 | #include <math-narrow-eval.h> | |
22 | #include <math-underflow.h> | |
23 | #include <math-svid-compat.h> | |
24 | #include <libm-alias-finite.h> | |
25 | #include <libm-alias-double.h> | |
26 | #include <errno.h> | |
27 | ||
28 | /* The i386 allows to use the default excess of precision to optimize the | |
29 | hypot implementation, since internal multiplication and sqrt is carried | |
30 | with 80-bit FP type. */ | |
31 | double | |
104d2005 | 32 | __hypot (double x, double y) |
a1d3c9b6 AZ |
33 | { |
34 | if (!isfinite (x) || !isfinite (y)) | |
35 | { | |
36 | if ((isinf (x) || isinf (y)) | |
37 | && !issignaling (x) && !issignaling (y)) | |
38 | return INFINITY; | |
39 | return x + y; | |
40 | } | |
41 | ||
42 | long double lx = x; | |
43 | long double ly = y; | |
44 | double r = math_narrow_eval ((double) sqrtl (lx * lx + ly * ly)); | |
45 | math_check_force_underflow_nonneg (r); | |
104d2005 AZ |
46 | if (isinf (r)) |
47 | __set_errno (ERANGE); | |
a1d3c9b6 AZ |
48 | return r; |
49 | } | |
104d2005 AZ |
50 | strong_alias (__hypot, __ieee754_hypot) |
51 | #if LIBM_SVID_COMPAT | |
52 | versioned_symbol (libm, __hypot, hypot, GLIBC_2_35); | |
a1d3c9b6 | 53 | libm_alias_finite (__ieee754_hypot, __hypot) |
104d2005 AZ |
54 | libm_alias_double_other (__hypot, hypot) |
55 | #else | |
56 | libm_alias_double (__hypot, hypot) | |
57 | #endif |