1/* e_scalbf.c -- float version of e_scalb.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
16#if defined(LIBM_SCCS) && !defined(lint)
17static char rcsid[] = "$NetBSD: e_scalbf.c,v 1.3 1995/05/10 20:46:12 jtc Exp $";
18#endif
19
20#include <fenv.h>
21#include "math.h"
22#include "math_private.h"
23
24#ifdef _SCALB_INT
25#ifdef __STDC__
26	float __ieee754_scalbf(float x, int fn)
27#else
28	float __ieee754_scalbf(x,fn)
29	float x; int fn;
30#endif
31#else
32#ifdef __STDC__
33	float __ieee754_scalbf(float x, float fn)
34#else
35	float __ieee754_scalbf(x,fn)
36	float x, fn;
37#endif
38#endif
39{
40#ifdef _SCALB_INT
41	return __scalbnf(x,fn);
42#else
43	if (__isnanf(x)||__isnanf(fn)) return x*fn;
44	if (!__finitef(fn)) {
45	    if(fn>(float)0.0) return x*fn;
46	    else if (x == 0)
47	      return x;
48	    else if (!__finitef (x))
49	      {
50# ifdef FE_INVALID
51		feraiseexcept (FE_INVALID);
52# endif
53		return __nanf ("");
54	      }
55	    else       return x/(-fn);
56	}
57	if (__rintf(fn)!=fn)
58	  {
59# ifdef FE_INVALID
60	    feraiseexcept (FE_INVALID);
61# endif
62	    return __nanf ("");
63	  }
64	if ( fn > (float)65000.0) return __scalbnf(x, 65000);
65	if (-fn > (float)65000.0) return __scalbnf(x,-65000);
66	return __scalbnf(x,(int)fn);
67#endif
68}
69