1*2fe8fb19SBen Gras /* w_expf.c -- float version of w_exp.c.
2*2fe8fb19SBen Gras * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3*2fe8fb19SBen Gras */
4*2fe8fb19SBen Gras
5*2fe8fb19SBen Gras /*
6*2fe8fb19SBen Gras * ====================================================
7*2fe8fb19SBen Gras * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8*2fe8fb19SBen Gras *
9*2fe8fb19SBen Gras * Developed at SunPro, a Sun Microsystems, Inc. business.
10*2fe8fb19SBen Gras * Permission to use, copy, modify, and distribute this
11*2fe8fb19SBen Gras * software is freely granted, provided that this notice
12*2fe8fb19SBen Gras * is preserved.
13*2fe8fb19SBen Gras * ====================================================
14*2fe8fb19SBen Gras */
15*2fe8fb19SBen Gras
16*2fe8fb19SBen Gras #include <sys/cdefs.h>
17*2fe8fb19SBen Gras #if defined(LIBM_SCCS) && !defined(lint)
18*2fe8fb19SBen Gras __RCSID("$NetBSD: w_expf.c,v 1.7 2007/08/20 16:01:40 drochner Exp $");
19*2fe8fb19SBen Gras #endif
20*2fe8fb19SBen Gras
21*2fe8fb19SBen Gras /*
22*2fe8fb19SBen Gras * wrapper expf(x)
23*2fe8fb19SBen Gras */
24*2fe8fb19SBen Gras
25*2fe8fb19SBen Gras #include "namespace.h"
26*2fe8fb19SBen Gras #include "math.h"
27*2fe8fb19SBen Gras #include "math_private.h"
28*2fe8fb19SBen Gras
29*2fe8fb19SBen Gras #ifdef __weak_alias
30*2fe8fb19SBen Gras __weak_alias(expf, _expf)
31*2fe8fb19SBen Gras #endif
32*2fe8fb19SBen Gras
33*2fe8fb19SBen Gras static const float
34*2fe8fb19SBen Gras o_threshold= 8.8721679688e+01, /* 0x42b17180 */
35*2fe8fb19SBen Gras u_threshold= -1.0397208405e+02; /* 0xc2cff1b5 */
36*2fe8fb19SBen Gras
37*2fe8fb19SBen Gras float
expf(float x)38*2fe8fb19SBen Gras expf(float x) /* wrapper expf */
39*2fe8fb19SBen Gras {
40*2fe8fb19SBen Gras #ifdef _IEEE_LIBM
41*2fe8fb19SBen Gras return __ieee754_expf(x);
42*2fe8fb19SBen Gras #else
43*2fe8fb19SBen Gras float z;
44*2fe8fb19SBen Gras z = __ieee754_expf(x);
45*2fe8fb19SBen Gras if(_LIB_VERSION == _IEEE_) return z;
46*2fe8fb19SBen Gras if(finitef(x)) {
47*2fe8fb19SBen Gras if(x>o_threshold)
48*2fe8fb19SBen Gras /* exp overflow */
49*2fe8fb19SBen Gras return (float)__kernel_standard((double)x,(double)x,106);
50*2fe8fb19SBen Gras else if(x<u_threshold)
51*2fe8fb19SBen Gras /* exp underflow */
52*2fe8fb19SBen Gras return (float)__kernel_standard((double)x,(double)x,107);
53*2fe8fb19SBen Gras }
54*2fe8fb19SBen Gras return z;
55*2fe8fb19SBen Gras #endif
56*2fe8fb19SBen Gras }
57