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re PR libstdc++/50509 ([C++0x] incorrect code in std::seed_seq::generate)

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2011-09-24  John Salmon  <john.salmon@deshaw.com>

	PR libstdc++/50509
	* include/bits/random.tcc (seed_seq::generate): Fix computation.

From-SVN: r179144
This commit is contained in:
John Salmon 2011-09-24 18:28:36 +00:00 committed by Paolo Carlini
parent a271590a43
commit 9d1f3ce6ff
2 changed files with 7 additions and 2 deletions
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5
libstdc++-v3/ChangeLog
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@ -1,3 +1,8 @@
2011-09-24 John Salmon <john.salmon@deshaw.com>
PR libstdc++/50509
* include/bits/random.tcc (seed_seq::generate): Fix computation.
2011-09-21 Benjamin Kosnik <bkoz@redhat.com
* doc/Makefile.am (stamp-epub-docbook): Fix image directory location.

4
libstdc++-v3/include/bits/random.tcc
View File

@ -2768,7 +2768,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_Type __arg = (__begin[__k % __n]
^ __begin[(__k + __p) % __n]
^ __begin[(__k - 1) % __n]);
_Type __r1 = __arg ^ (__arg << 27);
_Type __r1 = __arg ^ (__arg >> 27);
__r1 = __detail::__mod<_Type, __detail::_Shift<_Type, 32>::__value,
1664525u, 0u>(__r1);
_Type __r2 = __r1;
@ -2790,7 +2790,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_Type __arg = (__begin[__k % __n]
+ __begin[(__k + __p) % __n]
+ __begin[(__k - 1) % __n]);
_Type __r3 = __arg ^ (__arg << 27);
_Type __r3 = __arg ^ (__arg >> 27);
__r3 = __detail::__mod<_Type, __detail::_Shift<_Type, 32>::__value,
1566083941u, 0u>(__r3);
_Type __r4 = __r3 - __k % __n;