1*05a0b428SJohn Marino /* $OpenBSD: s_fmax.c,v 1.10 2013/11/12 18:28:02 martynas Exp $ */
2*05a0b428SJohn Marino /*-
3*05a0b428SJohn Marino * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
4*05a0b428SJohn Marino * All rights reserved.
5*05a0b428SJohn Marino *
6*05a0b428SJohn Marino * Redistribution and use in source and binary forms, with or without
7*05a0b428SJohn Marino * modification, are permitted provided that the following conditions
8*05a0b428SJohn Marino * are met:
9*05a0b428SJohn Marino * 1. Redistributions of source code must retain the above copyright
10*05a0b428SJohn Marino * notice, this list of conditions and the following disclaimer.
11*05a0b428SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
12*05a0b428SJohn Marino * notice, this list of conditions and the following disclaimer in the
13*05a0b428SJohn Marino * documentation and/or other materials provided with the distribution.
14*05a0b428SJohn Marino *
15*05a0b428SJohn Marino * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16*05a0b428SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17*05a0b428SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18*05a0b428SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19*05a0b428SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20*05a0b428SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21*05a0b428SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22*05a0b428SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23*05a0b428SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24*05a0b428SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25*05a0b428SJohn Marino * SUCH DAMAGE.
26*05a0b428SJohn Marino */
27*05a0b428SJohn Marino
28*05a0b428SJohn Marino #include <float.h>
29*05a0b428SJohn Marino #include <math.h>
30*05a0b428SJohn Marino
31*05a0b428SJohn Marino double
fmax(double x,double y)32*05a0b428SJohn Marino fmax(double x, double y)
33*05a0b428SJohn Marino {
34*05a0b428SJohn Marino /* Check for NaNs to avoid raising spurious exceptions. */
35*05a0b428SJohn Marino if (isnan(x))
36*05a0b428SJohn Marino return (y);
37*05a0b428SJohn Marino if (isnan(y))
38*05a0b428SJohn Marino return (x);
39*05a0b428SJohn Marino
40*05a0b428SJohn Marino /* Handle comparisons of signed zeroes. */
41*05a0b428SJohn Marino if (signbit(x) != signbit(y)) {
42*05a0b428SJohn Marino if (signbit(x))
43*05a0b428SJohn Marino return (y);
44*05a0b428SJohn Marino else
45*05a0b428SJohn Marino return (x);
46*05a0b428SJohn Marino }
47*05a0b428SJohn Marino
48*05a0b428SJohn Marino return (x > y ? x : y);
49*05a0b428SJohn Marino }
50*05a0b428SJohn Marino
51*05a0b428SJohn Marino #if LDBL_MANT_DIG == DBL_MANT_DIG
52*05a0b428SJohn Marino __strong_alias(fmaxl, fmax);
53*05a0b428SJohn Marino #endif /* LDBL_MANT_DIG == DBL_MANT_DIG */
54