| The Android Open Source Project | b07e1d9 | 2009-03-03 19:29:30 -0800 | [diff] [blame] | 1 | |
| 2 | |
| 3 | /* @(#)w_pow.c 1.3 95/01/18 */ |
| 4 | /* |
| 5 | * ==================================================== |
| 6 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| 7 | * |
| 8 | * Developed at SunSoft, a Sun Microsystems, Inc. business. |
| 9 | * Permission to use, copy, modify, and distribute this |
| 10 | * software is freely granted, provided that this notice |
| 11 | * is preserved. |
| 12 | * ==================================================== |
| 13 | */ |
| 14 | |
| 15 | /* |
| 16 | * wrapper ieee_pow(x,y) return x**y |
| 17 | */ |
| 18 | |
| 19 | #include "fdlibm.h" |
| 20 | |
| 21 | |
| 22 | #ifdef __STDC__ |
| 23 | double ieee_pow(double x, double y) /* wrapper pow */ |
| 24 | #else |
| 25 | double ieee_pow(x,y) /* wrapper pow */ |
| 26 | double x,y; |
| 27 | #endif |
| 28 | { |
| 29 | #ifdef _IEEE_LIBM |
| 30 | return __ieee754_pow(x,y); |
| 31 | #else |
| 32 | double z; |
| 33 | z=__ieee754_pow(x,y); |
| 34 | if(_LIB_VERSION == _IEEE_|| ieee_isnan(y)) return z; |
| 35 | if(ieee_isnan(x)) { |
| 36 | if(y==0.0) |
| 37 | return __kernel_standard(x,y,42); /* ieee_pow(NaN,0.0) */ |
| 38 | else |
| 39 | return z; |
| 40 | } |
| 41 | if(x==0.0){ |
| 42 | if(y==0.0) |
| 43 | return __kernel_standard(x,y,20); /* ieee_pow(0.0,0.0) */ |
| 44 | if(ieee_finite(y)&&y<0.0) |
| 45 | return __kernel_standard(x,y,23); /* ieee_pow(0.0,negative) */ |
| 46 | return z; |
| 47 | } |
| 48 | if(!ieee_finite(z)) { |
| 49 | if(ieee_finite(x)&&ieee_finite(y)) { |
| 50 | if(ieee_isnan(z)) |
| 51 | return __kernel_standard(x,y,24); /* pow neg**non-int */ |
| 52 | else |
| 53 | return __kernel_standard(x,y,21); /* pow overflow */ |
| 54 | } |
| 55 | } |
| 56 | if(z==0.0&&ieee_finite(x)&&ieee_finite(y)) |
| 57 | return __kernel_standard(x,y,22); /* pow underflow */ |
| 58 | return z; |
| 59 | #endif |
| 60 | } |