------- Comment #1 from jakub at gcc dot gnu dot org 2009-08-05 16:24 ------- I don't believe this is a valid OpenMP testcase. The standard says: "The behavior is unspecified if any intermediate result required to compute the iteration count cannot be represented in the type determined above." and that I think applies here, to compute the number of iterations you should be able to compute end + step (for downward loop actually end - step) in the iteration type, but here that wraps over. IMHO > 0U condition for omp for is only valid with step -1, not bigger steps.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40967
