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glibc/math/w_powl.c
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/* w_powl.c -- long double version of w_pow.c. | |
* Conversion to long double by Ulrich Drepper, | |
* Cygnus Support, drepper@cygnus.com. | |
*/ | |
/* | |
* ==================================================== | |
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | |
* | |
* Developed at SunPro, a Sun Microsystems, Inc. business. | |
* Permission to use, copy, modify, and distribute this | |
* software is freely granted, provided that this notice | |
* is preserved. | |
* ==================================================== | |
*/ | |
/* | |
* wrapper powl(x,y) return x**y | |
*/ | |
#include "math.h" | |
#include "math_private.h" | |
#ifdef __STDC__ | |
long double __powl(long double x, long double y)/* wrapper powl */ | |
#else | |
long double __powl(x,y) /* wrapper powl */ | |
long double x,y; | |
#endif | |
{ | |
#ifdef _IEEE_LIBM | |
return __ieee754_powl(x,y); | |
#else | |
long double z; | |
z=__ieee754_powl(x,y); | |
if(_LIB_VERSION == _IEEE_|| __isnanl(y)) return z; | |
if(__isnanl(x)) { | |
if(y==0.0) | |
return __kernel_standard(x,y,242); /* pow(NaN,0.0) */ | |
else | |
return z; | |
} | |
if(x==0.0) { | |
if(y==0.0) | |
return __kernel_standard(x,y,220); /* pow(0.0,0.0) */ | |
if(__finitel(y)&&y<0.0) { | |
if (signbit (x) && signbit (z)) | |
return __kernel_standard(x,y,223); /* pow(-0.0,negative) */ | |
else | |
return __kernel_standard(x,y,243); /* pow(+0.0,negative) */ | |
} | |
return z; | |
} | |
if(!__finitel(z)) { | |
if(__finitel(x)&&__finitel(y)) { | |
if(__isnanl(z)) | |
return __kernel_standard(x,y,224); /* pow neg**non-int */ | |
else | |
return __kernel_standard(x,y,221); /* pow overflow */ | |
} | |
} | |
if(z==0.0&&__finitel(x)&&__finitel(y)) | |
return __kernel_standard(x,y,222); /* pow underflow */ | |
return z; | |
#endif | |
} | |
weak_alias (__powl, powl) |