58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
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/* Euclidean distance function. Double/Binary64 i386 version.
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Copyright (C) 2021-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <math.h>
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#include <math_private.h>
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#include <math-narrow-eval.h>
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#include <math-underflow.h>
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#include <math-svid-compat.h>
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#include <libm-alias-finite.h>
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#include <libm-alias-double.h>
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#include <errno.h>
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/* The i386 allows to use the default excess of precision to optimize the
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hypot implementation, since internal multiplication and sqrt is carried
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with 80-bit FP type. */
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double
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__hypot (double x, double y)
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{
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if (!isfinite (x) || !isfinite (y))
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{
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if ((isinf (x) || isinf (y))
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&& !issignaling (x) && !issignaling (y))
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return INFINITY;
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return x + y;
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}
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long double lx = x;
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long double ly = y;
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double r = math_narrow_eval ((double) sqrtl (lx * lx + ly * ly));
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math_check_force_underflow_nonneg (r);
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if (isinf (r))
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__set_errno (ERANGE);
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return r;
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}
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strong_alias (__hypot, __ieee754_hypot)
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#if LIBM_SVID_COMPAT
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versioned_symbol (libm, __hypot, hypot, GLIBC_2_35);
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libm_alias_finite (__ieee754_hypot, __hypot)
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libm_alias_double_other (__hypot, hypot)
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#else
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libm_alias_double (__hypot, hypot)
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#endif
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