Rev 4872 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* sf_log2.c -- float version of s_log2.c. |
| 2 | * Modification of sf_exp10.c by Yaakov Selkowitz 2009. |
||
| 3 | */ |
||
| 4 | |||
| 5 | /* |
||
| 6 | * ==================================================== |
||
| 7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
||
| 8 | * |
||
| 9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
||
| 10 | * Permission to use, copy, modify, and distribute this |
||
| 11 | * software is freely granted, provided that this notice |
||
| 12 | * is preserved. |
||
| 13 | * ==================================================== |
||
| 14 | */ |
||
| 15 | |||
| 16 | /* |
||
| 17 | * wrapper log2f(x) |
||
| 18 | */ |
||
| 19 | |||
| 20 | #include "fdlibm.h" |
||
| 21 | #include |
||
| 22 | #include |
||
| 23 | #undef log2 |
||
| 24 | #undef log2f |
||
| 25 | |||
| 26 | #ifdef __STDC__ |
||
| 27 | float log2f(float x) /* wrapper log2f */ |
||
| 28 | #else |
||
| 29 | float log2f(x) /* wrapper log2f */ |
||
| 30 | float x; |
||
| 31 | #endif |
||
| 32 | { |
||
| 33 | return (logf(x) / (float_t) M_LN2); |
||
| 34 | } |
||
| 35 | |||
| 36 | #ifdef _DOUBLE_IS_32BITS |
||
| 37 | |||
| 38 | #ifdef __STDC__ |
||
| 39 | double log2(double x) |
||
| 40 | #else |
||
| 41 | double log2(x) |
||
| 42 | double x; |
||
| 43 | #endif |
||
| 44 | { |
||
| 45 | return (double) log2f((float) x); |
||
| 46 | } |
||
| 47 | |||
| 48 | #endif /* defined(_DOUBLE_IS_32BITS) */ |