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math.c: more accuracy

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* math.c (math_log10): calculate log10(2) for more accuracy.
  [ruby-core:79907] [Bug #13279]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57779 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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nobu 2017-03-05 01:46:20 +00:00
parent 3ca1cbecc6
commit 01fb669423
1 changed files with 1 additions and 1 deletions
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math.c
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@ -563,7 +563,7 @@ math_log10(VALUE unused_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 * M_LN2/M_LN10); /* log10(d * 2 ** numbits) */ return DBL2NUM(log10(d) + numbits * log10(2)); /* log10(d * 2 ** numbits) */
} }
/* /*