I've created a wiki page with the changes to codegen for the C++ memory
model that we're working on implementing.
http://gcc.gnu.org/wiki/Atomic/GCCMM/CodeGen
in a nutshell, it expands the set of __sync atomic builtin's to take
another parameter for memory model, and then allow machine descriptions
to customize the code for any specific combination.
It's already at version 2.0, I'm sure there will be more updates.
Please question, comment, or criticize!
Andrew
I've also started trying to figure out what optimizations can really be
performed on atomic accesses with synchronization and how/whether we'll
do them. Let me know if you have even a vague understanding of this
arcane subject and want to have some input early :-)
