Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
1 parent
bd0def0
commit 11c348b
Showing
19 changed files
with
152 additions
and
3 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,106 @@ | ||
/* | ||
* ==================================================== | ||
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | ||
* | ||
* Developed at SunPro, a Sun Microsystems, Inc. business. | ||
* Permission to use, copy, modify, and distribute this | ||
* software is freely granted, provided that this notice | ||
* is preserved. | ||
* ==================================================== | ||
*/ | ||
|
||
#if defined(_MSC_VER) /* Handle Microsoft VC++ compiler specifics. */ | ||
/* C4723: potential divide by zero. */ | ||
#pragma warning ( disable : 4723 ) | ||
#endif | ||
|
||
/* __ieee754_log10(x) | ||
* Return the base 10 logarithm of x | ||
* | ||
* Method : | ||
* Let log10_2hi = leading 40 bits of log10(2) and | ||
* log10_2lo = log10(2) - log10_2hi, | ||
* ivln10 = 1/log(10) rounded. | ||
* Then | ||
* n = ilogb(x), | ||
* if(n<0) n = n+1; | ||
* x = scalbn(x,-n); | ||
* log10(x) := n*log10_2hi + (n*log10_2lo + ivln10*log(x)) | ||
* | ||
* Note 1: | ||
* To guarantee log10(10**n)=n, where 10**n is normal, the rounding | ||
* mode must set to Round-to-Nearest. | ||
* Note 2: | ||
* [1/log(10)] rounded to 53 bits has error .198 ulps; | ||
* log10 is monotonic at all binary break points. | ||
* | ||
* Special cases: | ||
* log10(x) is NaN with signal if x < 0; | ||
* log10(+INF) is +INF with no signal; log10(0) is -INF with signal; | ||
* log10(NaN) is that NaN with no signal; | ||
* log10(10**N) = N for N=0,1,...,22. | ||
* | ||
* Constants: | ||
* The hexadecimal values are the intended ones for the following constants. | ||
* The decimal values may be used, provided that the compiler will convert | ||
* from decimal to binary accurately enough to produce the hexadecimal values | ||
* shown. | ||
*/ | ||
|
||
#include "math_libm.h" | ||
#include "math_private.h" | ||
|
||
static const double | ||
two54 = 1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */ | ||
ivln10 = 4.34294481903251816668e-01, /* 0x3FDBCB7B, 0x1526E50E */ | ||
log10_2hi = 3.01029995663611771306e-01, /* 0x3FD34413, 0x509F6000 */ | ||
log10_2lo = 3.69423907715893078616e-13; /* 0x3D59FEF3, 0x11F12B36 */ | ||
|
||
static const double zero = 0.0; | ||
|
||
double attribute_hidden __ieee754_log10(double x) | ||
{ | ||
double y,z; | ||
int32_t i,k,hx; | ||
u_int32_t lx; | ||
|
||
EXTRACT_WORDS(hx,lx,x); | ||
|
||
k=0; | ||
if (hx < 0x00100000) { /* x < 2**-1022 */ | ||
if (((hx&0x7fffffff)|lx)==0) | ||
return -two54/zero; /* log(+-0)=-inf */ | ||
if (hx<0) return (x-x)/zero; /* log(-#) = NaN */ | ||
k -= 54; x *= two54; /* subnormal number, scale up x */ | ||
GET_HIGH_WORD(hx,x); | ||
} | ||
if (hx >= 0x7ff00000) return x+x; | ||
k += (hx>>20)-1023; | ||
i = ((u_int32_t)k&0x80000000)>>31; | ||
hx = (hx&0x000fffff)|((0x3ff-i)<<20); | ||
y = (double)(k+i); | ||
SET_HIGH_WORD(x,hx); | ||
z = y*log10_2lo + ivln10*__ieee754_log(x); | ||
return z+y*log10_2hi; | ||
} | ||
|
||
/* | ||
* wrapper log10(X) | ||
*/ | ||
#ifndef _IEEE_LIBM | ||
double log10(double x) | ||
{ | ||
double z = __ieee754_log10(x); | ||
if (_LIB_VERSION == _IEEE_ || isnan(x)) | ||
return z; | ||
if (x <= 0.0) { | ||
if(x == 0.0) | ||
return __kernel_standard(x, x, 18); /* log10(0) */ | ||
return __kernel_standard(x, x, 19); /* log10(x<0) */ | ||
} | ||
return z; | ||
} | ||
#else | ||
strong_alias(__ieee754_log10, log10) | ||
#endif | ||
libm_hidden_def(log10) |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters