| 1 | /* Euclidean distance function. Double/Binary64 i386 version. |
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| 2 | Copyright (C) 2021-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <math.h> |
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| 20 | #include <math_private.h> |
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| 21 | #include <math-narrow-eval.h> |
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| 22 | #include <math-underflow.h> |
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| 23 | #include <math-svid-compat.h> |
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| 24 | #include <libm-alias-finite.h> |
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| 25 | #include <libm-alias-double.h> |
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| 26 | #include <errno.h> |
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| 27 | |
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| 28 | /* The i386 allows to use the default excess of precision to optimize the |
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| 29 | hypot implementation, since internal multiplication and sqrt is carried |
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| 30 | with 80-bit FP type. */ |
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| 31 | double |
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| 32 | __hypot (double x, double y) |
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| 33 | { |
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| 34 | if (!isfinite (x) || !isfinite (y)) |
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| 35 | { |
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| 36 | if ((isinf (x) || isinf (y)) |
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| 37 | && !issignaling (x) && !issignaling (y)) |
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| 38 | return INFINITY; |
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| 39 | return x + y; |
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| 40 | } |
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| 41 | |
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| 42 | long double lx = x; |
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| 43 | long double ly = y; |
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| 44 | double r = math_narrow_eval ((double) sqrtl (lx * lx + ly * ly)); |
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| 45 | math_check_force_underflow_nonneg (r); |
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| 46 | if (isinf (r)) |
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| 47 | __set_errno (ERANGE); |
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| 48 | return r; |
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| 49 | } |
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| 50 | strong_alias (__hypot, __ieee754_hypot) |
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| 51 | #if LIBM_SVID_COMPAT |
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| 52 | versioned_symbol (libm, __hypot, hypot, GLIBC_2_35); |
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| 53 | libm_alias_finite (__ieee754_hypot, __hypot) |
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| 54 | libm_alias_double_other (__hypot, hypot) |
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| 55 | #else |
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| 56 | libm_alias_double (__hypot, hypot) |
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| 57 | #endif |
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| 58 | |
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