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* configure.in (rb_cv_lgamma_r_pm0): check if lgamma_r(+0.0)

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returns positive infinity, in addition to lgamma_r(-0.0).
  AIX returns an incorrect result of negative infinity.

* math.c (ruby_lgamma_r): handle +0.0, in addition to -0.0.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54803 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
odaira 2016-04-27 20:00:57 +00:00
parent 173005bb6f
commit 7a3f794da0
3 changed files with 24 additions and 7 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
Thu Apr 28 04:49:07 2016 Rei Odaira <Rei.Odaira@gmail.com>
* configure.in (rb_cv_lgamma_r_pm0): check if lgamma_r(+0.0)
returns positive infinity, in addition to lgamma_r(-0.0).
AIX returns an incorrect result of negative infinity.
* math.c (ruby_lgamma_r): handle +0.0, in addition to -0.0.
Thu Apr 28 01:11:14 2016 NARUSE, Yui <naruse@ruby-lang.org>
* time.c: define _DEFAULT_SOURCE because glibc 2.20 depracates

18
configure.in
View file

@ -2503,7 +2503,7 @@ main(int argc, char **argv)
AS_IF([test "x$rb_cv_atan2_inf_c99" = xyes], [AC_DEFINE(ATAN2_INF_C99)])
AS_IF([test "x$ac_cv_func_lgamma_r" = xyes], [
AC_CACHE_CHECK(whether lgamma_r handles -0.0, rb_cv_lgamma_r_m0, [
AC_CACHE_CHECK(whether lgamma_r handles +0.0 and -0.0, rb_cv_lgamma_r_pm0, [
AC_TRY_RUN([
@%:@include <math.h>
@%:@ifdef HAVE_UNISTD_H
@ -2519,22 +2519,28 @@ AS_IF([test "x$ac_cv_func_lgamma_r" = xyes], [
int
main(int argc, char **argv)
{
int sign;
int sign = 0;
double x = lgamma_r(-0.0, &sign);
/* should be [+inf, -1] */
if (x <= 0) return EXIT_FAILURE;
if (!isinf(x)) return EXIT_FAILURE;
if (sign != -1) return EXIT_FAILURE;
/* should be [+inf, 1] */
x = lgamma_r(+0.0, &sign);
if (x <= 0) return EXIT_FAILURE;
if (!isinf(x)) return EXIT_FAILURE;
if (sign != 1) return EXIT_FAILURE;
return EXIT_SUCCESS;
}
],
[rb_cv_lgamma_r_m0=yes],
[rb_cv_lgamma_r_m0=no],
[rb_cv_lgamma_r_m0=yes]
[rb_cv_lgamma_r_pm0=yes],
[rb_cv_lgamma_r_pm0=no],
[rb_cv_lgamma_r_pm0=yes]
)
])
AS_IF([test "x$rb_cv_lgamma_r_m0" = xno], [AC_DEFINE(LGAMMA_R_M0_FIX)])
AS_IF([test "x$rb_cv_lgamma_r_pm0" = xno], [AC_DEFINE(LGAMMA_R_PM0_FIX)])
])
# Some platform need -lrt for clock_gettime, but the other don't.

5
math.c
View file

@ -750,7 +750,7 @@ ruby_tgamma(const double d)
#define tgamma(d) ruby_tgamma(d)
#endif
#if defined LGAMMA_R_M0_FIX
#if defined LGAMMA_R_PM0_FIX
static inline double
ruby_lgamma_r(const double d, int *sign)
{
@ -759,6 +759,9 @@ ruby_lgamma_r(const double d, int *sign)
if (d == 0.0 && signbit(d)) {
*sign = -1;
return INFINITY;
} else if (d == 0.0 && !signbit(d)) {
*sign = 1;
return INFINITY;
}
}
return g;