| |
| |
| /* @(#)w_pow.c 5.2 93/10/01 */ |
| /* |
| * ==================================================== |
| * 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 pow(x,y) return x**y |
| */ |
| |
| #include <math.h> |
| #include "math_private.h" |
| |
| |
| #ifdef __STDC__ |
| double __pow(double x, double y) /* wrapper pow */ |
| #else |
| double __pow(x,y) /* wrapper pow */ |
| double x,y; |
| #endif |
| { |
| #ifdef _IEEE_LIBM |
| return __ieee754_pow(x,y); |
| #else |
| double z; |
| z=__ieee754_pow(x,y); |
| if(_LIB_VERSION == _IEEE_|| __isnan(y)) return z; |
| if(__isnan(x)) { |
| if(y==0.0) |
| return __kernel_standard(x,y,42); /* pow(NaN,0.0) */ |
| else |
| return z; |
| } |
| if(x==0.0) { |
| if(y==0.0) |
| return __kernel_standard(x,y,20); /* pow(0.0,0.0) */ |
| if(__finite(y)&&y<0.0) { |
| if (signbit (x) && signbit (z)) |
| return __kernel_standard(x,y,23); /* pow(-0.0,negative) */ |
| else |
| return __kernel_standard(x,y,43); /* pow(+0.0,negative) */ |
| } |
| return z; |
| } |
| if(!__finite(z)) { |
| if(__finite(x)&&__finite(y)) { |
| if(__isnan(z)) |
| return __kernel_standard(x,y,24); /* pow neg**non-int */ |
| else |
| return __kernel_standard(x,y,21); /* pow overflow */ |
| } |
| } |
| if(z==0.0&&__finite(x)&&__finite(y)) |
| return __kernel_standard(x,y,22); /* pow underflow */ |
| return z; |
| #endif |
| } |
| weak_alias (__pow, pow) |
| #ifdef NO_LONG_DOUBLE |
| strong_alias (__pow, __powl) |
| weak_alias (__pow, powl) |
| #endif |
