1 | /* Compute maximum of two numbers, regarding NaN as missing argument. |
2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <sysdep.h> |
20 | #include <libm-alias-double.h> |
21 | |
22 | .text |
23 | ENTRY(__fmax) |
24 | fldl 4(%esp) // x |
25 | fldl 12(%esp) // x : y |
26 | |
27 | fucomi %st(0), %st |
28 | fcmovu %st(1), %st // now %st contains y if not NaN, x otherwise |
29 | |
30 | fxch |
31 | |
32 | fucomi %st(1), %st |
33 | fcmovb %st(1), %st |
34 | |
35 | fstp %st(1) |
36 | |
37 | ret |
38 | END(__fmax) |
39 | libm_alias_double (__fmax, fmax) |
40 | |