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[glibc/history.git] / math / e_scalbf.c
blob95a72eb56de87bad6ca4ae4531046c5e1d43c23a
1 /* e_scalbf.c -- float version of e_scalb.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
5 /*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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 * ====================================================
16 #if defined(LIBM_SCCS) && !defined(lint)
17 static char rcsid[] = "$NetBSD: e_scalbf.c,v 1.3 1995/05/10 20:46:12 jtc Exp $";
18 #endif
20 #include <fenv.h>
21 #include <math.h>
22 #include "math_private.h"
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
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))
50 # ifdef FE_INVALID
51 feraiseexcept (FE_INVALID);
52 # endif
53 return __nanf ("");
55 else return x/(-fn);
57 if (__rintf(fn)!=fn)
59 # ifdef FE_INVALID
60 feraiseexcept (FE_INVALID);
61 # endif
62 return __nanf ("");
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