[v3] libstdc++/50509

[Paolo Carlini]

Hi,

committed mainline and 4_6-branch.

Paolo.

//////////////////////

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

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

Index: include/bits/random.tcc
===================================================================
--- include/bits/random.tcc     (revision 179143)
+++ include/bits/random.tcc     (working copy)
@@ -2768,7 +2768,7 @@
          _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 @@
          _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;