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fix tgamma for inifity

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* configure.in: do not use buggy tgamma() of mingw.

* missing/tgamma.c (tgamma): merge fix for inifity from
  ruby_tgamma.  since msvcr120.dll and later have tgamma, this
  implementation will not be used.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58691 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-05-12 16:12:46 +00:00
parent ac6e069aef
commit 126aba8587
3 changed files with 22 additions and 16 deletions
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16
math.c
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@ -778,22 +778,6 @@ math_erfc(VALUE unused_obj, VALUE x)
return DBL2NUM(erfc(Get_Double(x)));
}
#if defined _WIN32
static inline double
ruby_tgamma(const double d)
{
const double g = tgamma(d);
if (isinf(g)) {
if (d == 0.0 && signbit(d)) return -INFINITY;
}
if (isnan(g)) {
if (!signbit(d)) return INFINITY;
}
return g;
}
#define tgamma(d) ruby_tgamma(d)
#endif
#if defined LGAMMA_R_PM0_FIX
static inline double
ruby_lgamma_r(const double d, int *sign)