| |
| |
| /* |
| * Copyright (c) 1998, 2001, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * wrapper pow(x,y) return x**y |
| */ |
| |
| #include "fdlibm.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) |
| return __kernel_standard(x,y,23); /* 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 |
| } |
