[Bug libstdc++/52699] infinite loop generated with -O0

[paolo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52699

--- Comment #9 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> 2012-04-15 02:14:45 UTC ---
Author: paolo
Date: Sun Apr 15 02:14:39 2012
New Revision: 186461

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186461
Log:
2012-04-14  Paolo Carlini  <paolo.carlini@oracle.com>

    PR libstdc++/52699
    * include/bits/random.tcc (independent_bits_engine<>::operator()())
    Avoid various overflows; use common_type on result_type and
    _RandomNumberEngine::result_type; avoid floating point computations;
    other smaller tweaks.

    * include/bits/random.tcc (uniform_int_distribution<>::operator())
    Use common_type; assume _UniformRandomNumberGenerator::result_type
    unsigned; tidy.

    * include/bits/stl_algobase.h (__lg(unsigned), __lg(unsigned long),
    __lg(unsigned long long)): Add.

Modified:
    branches/gcc-4_7-branch/libstdc++-v3/ChangeLog
    branches/gcc-4_7-branch/libstdc++-v3/include/bits/random.tcc
    branches/gcc-4_7-branch/libstdc++-v3/include/bits/stl_algobase.h