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math.c: use common constants

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* math.c (math_log1, math_log10): use common math constants
  instead of math function calls.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55641 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2016-07-12 11:53:43 +00:00
parent 9801daf9e1
commit fd2c613b1c
1 changed files with 12 additions and 2 deletions
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14
math.c
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@ -10,6 +10,9 @@
**********************************************************************/ **********************************************************************/
#include "internal.h" #include "internal.h"
#ifdef _MSC_VER
# define _USE_MATH_DEFINES 1
#endif
#include <float.h> #include <float.h>
#include <math.h> #include <math.h>
#include <errno.h> #include <errno.h>
@ -408,6 +411,13 @@ math_exp(VALUE obj, VALUE x)
# define log10(x) ((x) < 0.0 ? nan("") : log10(x)) # define log10(x) ((x) < 0.0 ? nan("") : log10(x))
#endif #endif
#ifndef M_LN2
# define M_LN2 0.693147180559945309417232121458176568
#endif
#ifndef M_LN10
# define M_LN10 2.30258509299404568401799145468436421
#endif
static double math_log1(VALUE x); static double math_log1(VALUE x);
/* /*
@ -466,7 +476,7 @@ math_log1(VALUE x)
/* check for pole error */ /* check for pole error */
if (d == 0.0) return -INFINITY; if (d == 0.0) return -INFINITY;
return log(d) + numbits * log(2); /* log(d * 2 ** numbits) */ return log(d) + numbits * M_LN2; /* log(d * 2 ** numbits) */
} }
#ifndef log2 #ifndef log2
@ -559,7 +569,7 @@ math_log10(VALUE obj, VALUE x)
/* check for pole error */ /* check for pole error */
if (d == 0.0) return DBL2NUM(-INFINITY); if (d == 0.0) return DBL2NUM(-INFINITY);
return DBL2NUM(log10(d) + numbits * log10(2)); /* log10(d * 2 ** numbits) */ return DBL2NUM(log10(d) + numbits * M_LN2/M_LN10); /* log10(d * 2 ** numbits) */
} }
/* /*