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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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21
missing/tgamma.c
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@ -10,9 +10,25 @@ reference - Haruhiko Okumura: C-gengo niyoru saishin algorithm jiten
gamma.c -- Gamma function
***********************************************************/
#include "ruby/config.h"
#include "ruby/missing.h"
#include <math.h>
#include <errno.h>
#ifdef _WIN32
# include <float.h>
# if !defined __MINGW32__ || defined __NO_ISOCEXT
# ifndef isnan
# define isnan(x) _isnan(x)
# endif
# ifndef isinf
# define isinf(x) (!_finite(x) && !_isnan(x))
# endif
# ifndef finite
# define finite(x) _finite(x)
# endif
# endif
#endif
#ifndef HAVE_LGAMMA_R
#include <errno.h>
@ -54,11 +70,16 @@ double tgamma(double x) /* Gamma function */
errno = ERANGE;
return 1/x < 0 ? -HUGE_VAL : HUGE_VAL;
}
if (isinf(x)) {
if (x < 0) goto domain_error;
return x;
}
if (x < 0) {
static double zero = 0.0;
double i, f;
f = modf(-x, &i);
if (f == 0.0) { /* Domain Error */
domain_error:
errno = EDOM;
return zero/zero;
}