| /* Compute x * y + z as ternary operation. |
| Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by David Flaherty <flaherty@linux.vnet.ibm.com>. |
| |
| 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/>. */ |
| |
| #include <math.h> |
| #include <math_ldbl_opt.h> |
| |
| long double |
| __fmal (long double x, long double y, long double z) |
| { |
| /* An IBM long double 128 is really just 2 IEEE64 doubles, and in |
| * the case of inf/nan only the first double counts. So we use the |
| * (double) cast to avoid any data movement. */ |
| if ((finite ((double)x) && finite ((double)y)) && isinf ((double)z)) |
| return (z); |
| |
| /* If z is zero and x are y are nonzero, compute the result |
| as x * y to avoid the wrong sign of a zero result if x * y |
| underflows to 0. */ |
| if (z == 0 && x != 0 && y != 0) |
| return x * y; |
| |
| return (x * y) + z; |
| } |
| #ifdef IS_IN_libm |
| long_double_symbol (libm, __fmal, fmal); |
| #else |
| long_double_symbol (libc, __fmal, fmal); |
| #endif |
