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6973fc01 | 1 | /* Compute maximum of two numbers, regarding NaN as missing argument. |
d4697bc9 | 2 | Copyright (C) 1997-2014 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 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
6973fc01 UD |
19 | |
20 | #include <sysdep.h> | |
21 | ||
22 | .text | |
23 | ENTRY(__fmaxf) | |
24 | flds 8(%esp) // y | |
25 | fxam | |
26 | fnstsw | |
27 | flds 4(%esp) // y : x | |
28 | ||
29 | andb $0x45, %ah | |
30 | cmpb $0x01, %ah | |
31 | je 1f // y == NaN | |
32 | ||
33 | fucom %st(1) | |
34 | fnstsw | |
35 | sahf | |
36 | jnc 1f | |
37 | ||
38 | fxch %st(1) | |
39 | 1: fstp %st(1) | |
40 | ||
41 | ret | |
42 | END(__fmaxf) | |
43 | weak_alias (__fmaxf, fmaxf) |