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Last change
on this file since 543 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
993 bytes
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| 1 | /* wf_log2.c -- float version of s_log2.c. |
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| 2 | * Modification of sf_exp10.c by Yaakov Selkowitz 2009. |
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| 3 | */ |
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| 4 | |
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| 5 | /* |
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| 6 | * ==================================================== |
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| 7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 8 | * |
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| 9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 10 | * Permission to use, copy, modify, and distribute this |
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| 11 | * software is freely granted, provided that this notice |
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| 12 | * is preserved. |
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| 13 | * ==================================================== |
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| 14 | */ |
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| 15 | |
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| 16 | /* |
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| 17 | * wrapper log2f(x) |
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| 18 | */ |
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| 19 | |
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| 20 | #include "fdlibm.h" |
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| 21 | #if __OBSOLETE_MATH |
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| 22 | #include <errno.h> |
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| 23 | #include <math.h> |
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| 24 | #undef log2 |
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| 25 | #undef log2f |
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| 26 | |
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| 27 | #ifdef __STDC__ |
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| 28 | float log2f(float x) /* wrapper log2f */ |
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| 29 | #else |
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| 30 | float log2f(x) /* wrapper log2f */ |
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| 31 | float x; |
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| 32 | #endif |
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| 33 | { |
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| 34 | return (logf(x) / (float_t) M_LN2); |
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| 35 | } |
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| 36 | |
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| 37 | #ifdef _DOUBLE_IS_32BITS |
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| 38 | |
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| 39 | #ifdef __STDC__ |
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| 40 | double log2(double x) |
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| 41 | #else |
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| 42 | double log2(x) |
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| 43 | double x; |
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| 44 | #endif |
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| 45 | { |
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| 46 | return (double) log2f((float) x); |
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| 47 | } |
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| 48 | |
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| 49 | #endif /* defined(_DOUBLE_IS_32BITS) */ |
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| 50 | #endif /* __OBSOLETE_MATH */ |
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