| /* Implement __kernel_standard_l. |
| Copyright (C) 2012-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. |
| |
| Parts based on k_standard.c from fdlibm: */ |
| |
| /* @(#)k_standard.c 5.1 93/09/24 */ |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| #include <math.h> |
| #include <math_private.h> |
| #include <math-svid-compat.h> |
| #include <fenv.h> |
| #include <float.h> |
| #include <errno.h> |
| |
| |
| #if LIBM_SVID_COMPAT |
| |
| static double zero = 0.0; |
| |
| /* Handle errors for a libm function as specified by TYPE (see |
| comments in k_standard.c for details), with arguments X and Y, |
| returning the appropriate return value for that function. */ |
| |
| long double |
| __kernel_standard_l (long double x, long double y, int type) |
| { |
| double dx, dy; |
| struct exception exc; |
| fenv_t env; |
| |
| feholdexcept (&env); |
| dx = x; |
| dy = y; |
| math_force_eval (dx); |
| math_force_eval (dy); |
| fesetenv (&env); |
| |
| switch (type) |
| { |
| case 221: |
| /* powl (x, y) overflow. */ |
| exc.arg1 = dx; |
| exc.arg2 = dy; |
| exc.type = OVERFLOW; |
| exc.name = (char *) "powl"; |
| if (_LIB_VERSION == _SVID_) |
| { |
| exc.retval = HUGE; |
| y *= 0.5; |
| if (x < zero && __rintl (y) != y) |
| exc.retval = -HUGE; |
| } |
| else |
| { |
| exc.retval = HUGE_VAL; |
| y *= 0.5; |
| if (x < zero && __rintl (y) != y) |
| exc.retval = -HUGE_VAL; |
| } |
| if (_LIB_VERSION == _POSIX_) |
| __set_errno (ERANGE); |
| else if (!matherr (&exc)) |
| __set_errno (ERANGE); |
| return exc.retval; |
| |
| case 222: |
| /* powl (x, y) underflow. */ |
| exc.arg1 = dx; |
| exc.arg2 = dy; |
| exc.type = UNDERFLOW; |
| exc.name = (char *) "powl"; |
| exc.retval = zero; |
| y *= 0.5; |
| if (x < zero && __rintl (y) != y) |
| exc.retval = -zero; |
| if (_LIB_VERSION == _POSIX_) |
| __set_errno (ERANGE); |
| else if (!matherr (&exc)) |
| __set_errno (ERANGE); |
| return exc.retval; |
| |
| default: |
| return __kernel_standard (dx, dy, type); |
| } |
| } |
| #endif |