summary refs log tree commit diff
path: root/sysdeps/libm-ieee754/e_scalbf.c
blob: f51057e7b44f9c2c69e420e1d7bd5bc9dba3bda7 (plain) (blame)
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
44
45
46
47
48
49
50
51
52
53
54
55
56
/* e_scalbf.c -- float version of e_scalb.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice 
 * is preserved.
 * ====================================================
 */

#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: e_scalbf.c,v 1.3 1995/05/10 20:46:12 jtc Exp $";
#endif

#include "math.h"
#include "math_private.h"

#ifdef _SCALB_INT
#ifdef __STDC__
	float __ieee754_scalbf(float x, int fn)
#else
	float __ieee754_scalbf(x,fn)
	float x; int fn;
#endif
#else
#ifdef __STDC__
	float __ieee754_scalbf(float x, float fn)
#else
	float __ieee754_scalbf(x,fn)
	float x, fn;
#endif
#endif
{
#ifdef _SCALB_INT
	return __scalbnf(x,fn);
#else
	if (__isnanf(x)||__isnanf(fn)) return x*fn;
	if (!__finitef(fn)) {
	    if(fn>(float)0.0) return x*fn;
	    else if (x == 0)
	      return x;
	    else if (!__finitef (x))
	      return __nanf ("");
	    else       return x/(-fn);
	}
	if (__rintf(fn)!=fn) return __nanf ("");
	if ( fn > (float)65000.0) return __scalbnf(x, 65000);
	if (-fn > (float)65000.0) return __scalbnf(x,-65000);
	return __scalbnf(x,(int)fn);
#endif
}