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[1] | 1 | |
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| 2 | /* @(#)w_log.c 5.1 93/09/24 */ |
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| 3 | /* |
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| 4 | * ==================================================== |
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| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 6 | * |
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| 7 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 8 | * Permission to use, copy, modify, and distribute this |
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| 9 | * software is freely granted, provided that this notice |
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| 10 | * is preserved. |
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| 11 | * ==================================================== |
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| 12 | */ |
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| 13 | |
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| 14 | /* |
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| 15 | * wrapper log(x) |
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| 16 | */ |
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| 17 | |
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| 18 | #include <libm/fdlibm.h> |
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| 19 | |
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| 20 | |
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| 21 | #ifdef __STDC__ |
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| 22 | double log(double x) /* wrapper log */ |
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| 23 | #else |
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| 24 | double log(x) /* wrapper log */ |
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| 25 | double x; |
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| 26 | #endif |
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| 27 | { |
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| 28 | #ifdef _IEEE_LIBM |
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| 29 | return __ieee754_log(x); |
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| 30 | #else |
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| 31 | double z; |
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| 32 | z = __ieee754_log(x); |
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| 33 | if(_LIB_VERSION == _IEEE_ || isnan(x) || x > 0.0) return z; |
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| 34 | if(x==0.0) |
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| 35 | return __kernel_standard(x,x,16); /* log(0) */ |
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| 36 | else |
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| 37 | return __kernel_standard(x,x,17); /* log(x<0) */ |
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| 38 | #endif |
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| 39 | } |
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