| /* Compute maximum of two numbers, regarding NaN as missing argument. |
| Copyright (C) 1997-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
| |
| 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 <libm-alias-ldouble.h> |
| #include <sysdep.h> |
| |
| .text |
| ENTRY(__fmaxl) |
| fldt 16(%esp) // y |
| fxam |
| fnstsw |
| fldt 4(%esp) // y : x |
| |
| andb $0x45, %ah |
| cmpb $0x01, %ah |
| je 2f // y == NaN |
| |
| fxam |
| fnstsw |
| andb $0x45, %ah |
| cmpb $0x01, %ah |
| je 3f // x == NaN |
| |
| fucom %st(1) |
| fnstsw |
| sahf |
| jnc 1f |
| |
| fxch %st(1) |
| 1: fstp %st(1) |
| |
| ret |
| |
| 2: // st(1) is a NaN; st(0) may or may not be. |
| fxam |
| fnstsw |
| andb $0x45, %ah |
| cmpb $0x01, %ah |
| je 4f |
| // st(1) is a NaN; st(0) is not. Test if st(1) is signaling. |
| testb $0x40, 23(%esp) |
| jz 4f |
| fstp %st(1) |
| ret |
| |
| 3: // st(0) is a NaN; st(1) is not. Test if st(0) is signaling. |
| testb $0x40, 11(%esp) |
| jz 4f |
| fstp %st(0) |
| ret |
| |
| 4: // Both arguments are NaNs, or one is a signaling NaN. |
| faddp |
| ret |
| END(__fmaxl) |
| libm_alias_ldouble (__fmax, fmax) |
