1 2 3 /* 4 * Copyright (c) 1998, 2001, Oracle and/or its affiliates. All rights reserved. 5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 6 * 7 * This code is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 only, as 9 * published by the Free Software Foundation. Oracle designates this 10 * particular file as subject to the "Classpath" exception as provided 11 * by Oracle in the LICENSE file that accompanied this code. 12 * 13 * This code is distributed in the hope that it will be useful, but WITHOUT 14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 * version 2 for more details (a copy is included in the LICENSE file that 17 * accompanied this code). 18 * 19 * You should have received a copy of the GNU General Public License version 20 * 2 along with this work; if not, write to the Free Software Foundation, 21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 22 * 23 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 24 * or visit www.oracle.com if you need additional information or have any 25 * questions. 26 */ 27 28 /* 29 * wrapper pow(x,y) return x**y 30 */ 31 32 #include "fdlibm.h" 33 34 35 #ifdef __STDC__ 36 double pow(double x, double y) /* wrapper pow */ 37 #else 38 double pow(x,y) /* wrapper pow */ 39 double x,y; 40 #endif 41 { 42 #ifdef _IEEE_LIBM 43 return __ieee754_pow(x,y); 44 #else 45 double z; 46 z=__ieee754_pow(x,y); 47 if(_LIB_VERSION == _IEEE_|| isnan(y)) return z; 48 if(isnan(x)) { 49 if(y==0.0) 50 return __kernel_standard(x,y,42); /* pow(NaN,0.0) */ 51 else 52 return z; 53 } 54 if(x==0.0){ 55 if(y==0.0) 56 return __kernel_standard(x,y,20); /* pow(0.0,0.0) */ 57 if(finite(y)&&y<0.0) 58 return __kernel_standard(x,y,23); /* pow(0.0,negative) */ 59 return z; 60 } 61 if(!finite(z)) { 62 if(finite(x)&&finite(y)) { 63 if(isnan(z)) 64 return __kernel_standard(x,y,24); /* pow neg**non-int */ 65 else 66 return __kernel_standard(x,y,21); /* pow overflow */ 67 } 68 } 69 if(z==0.0&&finite(x)&&finite(y)) 70 return __kernel_standard(x,y,22); /* pow underflow */ 71 return z; 72 #endif 73 }