projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 6973fc01 | 1 | /* Compute maximum of two numbers, regarding NaN as missing argument. |
| 2b778ceb | 2 | Copyright (C) 1997-2021 Free Software Foundation, Inc. |
| 6973fc01 UD |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 6973fc01 UD |
10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 14 | Lesser General Public License for more details. |
| 6973fc01 | 15 | |
| 41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 | 17 | License along with the GNU C Library; if not, see |
| 5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
| 6973fc01 UD |
19 | |
| 20 | #include <sysdep.h> | |
| bc4e8f9b | 21 | #include <libm-alias-double.h> |
| 6973fc01 UD |
22 | |
| 23 | .text | |
| 24 | ENTRY(__fmax) | |
| 25 | fldl 12(%esp) // y | |
| 26 | fxam | |
| 27 | fnstsw | |
| 28 | fldl 4(%esp) // y : x | |
| 29 | ||
| 30 | andb $0x45, %ah | |
| 31 | cmpb $0x01, %ah | |
| 32 | je 1f // y == NaN | |
| 33 | ||
| 34 | fucom %st(1) | |
| 35 | fnstsw | |
| 36 | sahf | |
| 37 | jnc 1f | |
| 38 | ||
| 39 | fxch %st(1) | |
| 40 | 1: fstp %st(1) | |
| 41 | ||
| 42 | ret | |
| 43 | END(__fmax) | |
| bc4e8f9b | 44 | libm_alias_double (__fmax, fmax) |