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math.c: fix lgamma

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* math.c (ruby_lgamma_r): fix lgamma(-0.0) on mingw and OSX.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54494 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2016-04-05 15:53:32 +00:00
parent 8c4c3508d9
commit 542d3a071f
3 changed files with 24 additions and 1 deletions
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4
ChangeLog
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@ -1,4 +1,6 @@
Wed Apr 6 00:52:00 2016 Nobuyoshi Nakada <nobu@ruby-lang.org>
Wed Apr 6 00:53:31 2016 Nobuyoshi Nakada <nobu@ruby-lang.org>
* math.c (ruby_lgamma_r): fix lgamma(-0.0) on mingw and OSX.
* math.c (ruby_tgamma): fix tgamma(-0.0) on mingw.
[ruby-core:74817] [Bug #12249]

16
math.c
View file

@ -750,6 +750,22 @@ ruby_tgamma(const double d)
#define tgamma(d) ruby_tgamma(d)
#endif
#if defined __MINGW32__ || defined __APPLE__
static inline double
ruby_lgamma_r(const double d, int *sign)
{
const double g = lgamma_r(d, sign);
if (isinf(g)) {
if (d == 0.0 && signbit(d)) {
*sign = -1;
return INFINITY;
}
}
return g;
}
#define lgamma_r(d, sign) ruby_lgamma_r(d, sign)
#endif
/*
* call-seq:
* Math.gamma(x) -> Float

5
test/ruby/test_math.rb
View file

@ -275,6 +275,11 @@ class TestMath < Test::Unit::TestCase
assert_float_and_int([Math.log(6), 1], Math.lgamma(4))
assert_raise(Math::DomainError) { Math.lgamma(-Float::INFINITY) }
x, sign = Math.lgamma(-0.0)
mesg = "Math.lgamma(-0.0) should be [INF, -1]"
assert_infinity(x, mesg)
assert_predicate(x, :positive?, mesg)
assert_equal(-1, sign, mesg)
end
def test_fixnum_to_f