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math.c: tanh overflow

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* math.c (tanh): check overflows, and return +-1.0.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55798 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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nobu 2016-08-02 12:40:51 +00:00
parent aa8e9c63ad
commit 83cfc94563
2 changed files with 5 additions and 1 deletions
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math.c
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@ -283,7 +283,9 @@ math_sinh(VALUE obj, VALUE x)
double
tanh(double x)
{
return sinh(x) / cosh(x);
const double c = cosh(x);
if (!isinf(c)) return sinh(x) / c;
return x > 0 ? 1.0 : -1.0;
}
#endif