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Use log2(b) instead of (log(b) / M_LN2)

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Co-Authored-By: Nobuyoshi Nakada <nobu@ruby-lang.org>
This commit is contained in:
Yusuke Endoh 2023-09-13 19:21:52 +09:00
parent 411572661a
commit a0e6687305
Notes: git 2023-09-13 12:40:24 +00:00 
Merged: https://github.com/ruby/ruby/pull/8429
1 changed files with 2 additions and 1 deletions
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math.c
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@ -538,6 +538,7 @@ math_log_split(VALUE x, size_t *numbits)
# define log_intermediate log2 # define log_intermediate log2
#else #else
# define log_intermediate log10 # define log_intermediate log10
double log2(double x);
#endif #endif
VALUE VALUE
@ -561,7 +562,7 @@ rb_math_log(int argc, const VALUE *argv)
return DBL2NUM(-0.0); return DBL2NUM(-0.0);
} }
d = log_intermediate(d) / log_intermediate(b); d = log_intermediate(d) / log_intermediate(b);
d += (numbits - numbits_2) * M_LN2 / log(b); d += (numbits - numbits_2) / log2(b);
} }
else { else {
/* check for pole error */ /* check for pole error */