From: Manuel López-Ibáñez <manu@gcc.gnu.org>
Date: Mon, 4 Feb 2013 17:10:59 +0000 (+0000)
Subject: re PR libstdc++/56202 (SIGFPE (division by zero) in std::binomial_distribution)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=85018f40aedb5d60c63a8f3f85f17d71c84b01ac;p=gcc.git

re PR libstdc++/56202 (SIGFPE (division by zero) in std::binomial_distribution)

2013-02-04  Manuel López-Ibáñez  <manu@gcc.gnu.org>
	    Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/56202
	* include/bits/random.tcc (binomial_distribution<>::
	_M_waiting(_UniformRandomNumberGenerator&, _IntType)): Avoid
	division by zero.

Co-Authored-By: Paolo Carlini <paolo.carlini@oracle.com>

From-SVN: r195722
---

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 1a8a822fd51..077e48386c0 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,11 @@
+2013-02-04  Manuel López-Ibáñez  <manu@gcc.gnu.org>
+	    Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR libstdc++/56202
+	* include/bits/random.tcc (binomial_distribution<>::
+	_M_waiting(_UniformRandomNumberGenerator&, _IntType)): Avoid
+	division by zero.
+
 2013-02-03  Richard Sandiford  <rdsandiford@googlemail.com>
 
 	Update copyright years.
diff --git a/libstdc++-v3/include/bits/random.tcc b/libstdc++-v3/include/bits/random.tcc
index ffa3967492b..6220a5d61d4 100644
--- a/libstdc++-v3/include/bits/random.tcc
+++ b/libstdc++-v3/include/bits/random.tcc
@@ -1658,6 +1658,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	do
 	  {
 	    const double __e = -std::log(1.0 - __aurng());
+	    if (__t == __x)
+	      {
+		if (__e)
+		  return __x;
+		continue;
+	      }
 	    __sum += __e / (__t - __x);
 	    __x += 1;
 	  }