Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most
[dragonfly.git] / lib / msun / src / w_expf.c
1 /* w_expf.c -- float version of w_exp.c.
2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3  *
4  * $FreeBSD: src/lib/msun/src/w_expf.c,v 1.5 1999/08/28 00:07:00 peter Exp $
5  * $DragonFly: src/lib/msun/src/Attic/w_expf.c,v 1.2 2003/06/17 04:26:53 dillon Exp $
6  */
7
8 /*
9  * ====================================================
10  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
11  *
12  * Developed at SunPro, a Sun Microsystems, Inc. business.
13  * Permission to use, copy, modify, and distribute this
14  * software is freely granted, provided that this notice
15  * is preserved.
16  * ====================================================
17  */
18
19 /*
20  * wrapper expf(x)
21  */
22
23 #include "math.h"
24 #include "math_private.h"
25
26 #ifdef __STDC__
27 static const float
28 #else
29 static float
30 #endif
31 o_threshold=  8.8721679688e+01,  /* 0x42b17180 */
32 u_threshold= -1.0397208405e+02;  /* 0xc2cff1b5 */
33
34 #ifdef __STDC__
35         float expf(float x)             /* wrapper expf */
36 #else
37         float expf(x)                   /* wrapper expf */
38         float x;
39 #endif
40 {
41 #ifdef _IEEE_LIBM
42         return __ieee754_expf(x);
43 #else
44         float z;
45         z = __ieee754_expf(x);
46         if(_LIB_VERSION == _IEEE_) return z;
47         if(finitef(x)) {
48             if(x>o_threshold)
49                 /* exp overflow */
50                 return (float)__kernel_standard((double)x,(double)x,106);
51             else if(x<u_threshold)
52                 /* exp underflow */
53                 return (float)__kernel_standard((double)x,(double)x,107);
54         }
55         return z;
56 #endif
57 }