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| 2 | |
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| 3 | /* @(#)w_pow.c 5.2 93/10/01 */ |
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| 4 | /* |
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| 5 | * ==================================================== |
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| 6 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 7 | * |
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| 8 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 9 | * Permission to use, copy, modify, and distribute this |
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| 10 | * software is freely granted, provided that this notice |
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| 11 | * is preserved. |
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| 12 | * ==================================================== |
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| 13 | */ |
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| 14 | |
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| 15 | /* |
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| 16 | * wrapper pow(x,y) return x**y |
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| 17 | */ |
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| 18 | |
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| 19 | #include <libm/fdlibm.h> |
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| 20 | |
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| 21 | |
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| 22 | #ifdef __STDC__ |
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| 23 | double pow(double x, double y) /* wrapper pow */ |
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| 24 | #else |
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| 25 | double pow(x,y) /* wrapper pow */ |
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| 26 | double x,y; |
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| 27 | #endif |
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| 28 | { |
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| 29 | #ifdef _IEEE_LIBM |
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| 30 | return __ieee754_pow(x,y); |
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| 31 | #else |
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| 32 | double z; |
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| 33 | z=__ieee754_pow(x,y); |
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| 34 | if(_LIB_VERSION == _IEEE_|| isnan(y)) return z; |
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| 35 | if(isnan(x)) { |
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| 36 | if(y==0.0) |
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| 37 | return __kernel_standard(x,y,42); /* pow(NaN,0.0) */ |
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| 38 | else |
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| 39 | return z; |
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| 40 | } |
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| 41 | if(x==0.0){ |
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| 42 | if(y==0.0) |
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| 43 | return __kernel_standard(x,y,20); /* pow(0.0,0.0) */ |
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| 44 | if(finite(y)&&y<0.0) |
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| 45 | return __kernel_standard(x,y,23); /* pow(0.0,negative) */ |
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| 46 | return z; |
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| 47 | } |
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| 48 | if(!finite(z)) { |
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| 49 | if(finite(x)&&finite(y)) { |
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| 50 | if(isnan(z)) |
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| 51 | return __kernel_standard(x,y,24); /* pow neg**non-int */ |
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| 52 | else |
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| 53 | return __kernel_standard(x,y,21); /* pow overflow */ |
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| 54 | } |
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| 55 | } |
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| 56 | if(z==0.0&&finite(x)&&finite(y)) |
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| 57 | return __kernel_standard(x,y,22); /* pow underflow */ |
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| 58 | return z; |
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| 59 | #endif |
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| 60 | } |
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