108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/* Implement __kernel_standard_l.
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Copyright (C) 2012-2015 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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<http://www.gnu.org/licenses/>.
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Parts based on k_standard.c from fdlibm: */
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/* @(#)k_standard.c 5.1 93/09/24 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include <math.h>
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#include <math_private.h>
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#include <fenv.h>
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#include <float.h>
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#include <errno.h>
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static double zero = 0.0;
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/* Handle errors for a libm function as specified by TYPE (see
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comments in k_standard.c for details), with arguments X and Y,
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returning the appropriate return value for that function. */
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long double
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__kernel_standard_l (long double x, long double y, int type)
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{
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double dx, dy;
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struct exception exc;
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fenv_t env;
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feholdexcept (&env);
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dx = x;
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dy = y;
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math_force_eval (dx);
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math_force_eval (dy);
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fesetenv (&env);
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switch (type)
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{
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case 221:
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/* powl (x, y) overflow. */
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exc.arg1 = dx;
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exc.arg2 = dy;
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exc.type = OVERFLOW;
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exc.name = (char *) "powl";
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if (_LIB_VERSION == _SVID_)
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{
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exc.retval = HUGE;
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y *= 0.5;
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if (x < zero && __rintl (y) != y)
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exc.retval = -HUGE;
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}
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else
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{
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exc.retval = HUGE_VAL;
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y *= 0.5;
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if (x < zero && __rintl (y) != y)
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exc.retval = -HUGE_VAL;
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}
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if (_LIB_VERSION == _POSIX_)
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__set_errno (ERANGE);
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else if (!matherr (&exc))
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__set_errno (ERANGE);
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return exc.retval;
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case 222:
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/* powl (x, y) underflow. */
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exc.arg1 = dx;
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exc.arg2 = dy;
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exc.type = UNDERFLOW;
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exc.name = (char *) "powl";
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exc.retval = zero;
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y *= 0.5;
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if (x < zero && __rintl (y) != y)
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exc.retval = -zero;
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if (_LIB_VERSION == _POSIX_)
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__set_errno (ERANGE);
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else if (!matherr (&exc))
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__set_errno (ERANGE);
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return exc.retval;
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default:
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return __kernel_standard (dx, dy, type);
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}
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}
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