http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53436
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-05-22 07:59:01 UTC --- (In reply to comment #4) > (In reply to comment #3) > > The testcase is not valid OpenMP, there is no flush operation in between the > > store and reads, > > Is that also needed with volatile variables? Would be quite counterintuitive. I believe so. Volatile only makes sure the compiler emits a store of the variable to memory, but the CPU can just store it into a cache. There is nothing that orders that store compared to other stores/loads. So, just use the appropriate OpenMP directives for synchronization, rather than bad attempts at busy waiting using volatile.
