aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/i386/fpu/s_fmaxl.S
blob: a38a1946bcb2601d1fe5fb20807773388a9450d6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
/* Compute maximum of two numbers, regarding NaN as missing argument.
   Copyright (C) 1997-2016 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 <sysdep.h>

	.text
ENTRY(__fmaxl)
	fldt	16(%esp)	// y
	fxam
	fnstsw
	fldt	4(%esp)		// y : x

	andb	$0x45, %ah
	cmpb	$0x01, %ah
	je	1f		// y == NaN

	fucom	%st(1)
	fnstsw
	sahf
	jnc	1f

	fxch	%st(1)
1:	fstp	%st(1)

	ret
END(__fmaxl)
weak_alias (__fmaxl, fmaxl)