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[glibc.git] / math / w_powl.c
blob17feb9fc61661d7ae7759a4bd5a1ba30ea15381c
1 /* w_powl.c -- long double version of w_pow.c.
2 * Conversion to long double by Ulrich Drepper,
3 * Cygnus Support, drepper@cygnus.com.
4 */
6 /*
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
13 * is preserved.
14 * ====================================================
18 * wrapper powl(x,y) return x**y
21 #include "math.h"
22 #include "math_private.h"
25 #ifdef __STDC__
26 long double __powl(long double x, long double y)/* wrapper powl */
27 #else
28 long double __powl(x,y) /* wrapper powl */
29 long double x,y;
30 #endif
32 #ifdef _IEEE_LIBM
33 return __ieee754_powl(x,y);
34 #else
35 long double z;
36 z=__ieee754_powl(x,y);
37 if(_LIB_VERSION == _IEEE_|| __isnanl(y)) return z;
38 if(__isnanl(x)) {
39 if(y==0.0)
40 return __kernel_standard(x,y,242); /* pow(NaN,0.0) */
41 else
42 return z;
44 if(x==0.0) {
45 if(y==0.0)
46 return __kernel_standard(x,y,220); /* pow(0.0,0.0) */
47 if(__finitel(y)&&y<0.0) {
48 if (signbit (x) && signbit (z))
49 return __kernel_standard(x,y,223); /* pow(-0.0,negative) */
50 else
51 return __kernel_standard(x,y,243); /* pow(+0.0,negative) */
53 return z;
55 if(!__finitel(z)) {
56 if(__finitel(x)&&__finitel(y)) {
57 if(__isnanl(z))
58 return __kernel_standard(x,y,224); /* pow neg**non-int */
59 else
60 return __kernel_standard(x,y,221); /* pow overflow */
63 if(z==0.0&&__finitel(x)&&__finitel(y))
64 return __kernel_standard(x,y,222); /* pow underflow */
65 return z;
66 #endif
68 weak_alias (__powl, powl)