1/* Compute maximum of two numbers, regarding NaN as missing argument.
2   Copyright (C) 1997-2022 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-ldouble.h>
21
22	.text
23ENTRY(__fmaxl)
24	fldt	4(%esp)		// x
25	fldt	16(%esp)	// x : y
26
27	fucomi	%st(1), %st
28	jp	2f
29	fcmovb	%st(1), %st
30
31	fstp	%st(1)
32
33	ret
34
352:	// Unordered.
36	fucomi	%st(0), %st
37	jp	3f
38	// st(1) is a NaN; st(0) is not.  Test if st(1) is signaling.
39	testb	$0x40, 11(%esp)
40	jz	4f
41	fstp	%st(1)
42	ret
43
443:	// st(0) is a NaN; st(1) may or may not be.
45	fxch
46	fucomi	%st(0), %st
47	jp	4f
48	// st(1) is a NaN; st(0) is not.  Test if st(1) is signaling.
49	testb	$0x40, 23(%esp)
50	jz	4f
51	fstp	%st(1)
52	ret
53
544:	// Both arguments are NaNs, or one is a signaling NaN.
55	faddp
56	ret
57END(__fmaxl)
58libm_alias_ldouble (__fmax, fmax)
59