> > For Johan's primops to work, each primop must represent a full memory > fence that is respected both by the architecture, and by *both* compilers > (GHC & LLVM). Since I don't think GHC is a problem, let's talk about LLVM. > We need to verify that LLVM understands not to float regular loads and > stores past one of its own atomic instructions. If that is the case (even > without anything being marked "volatile"), then I think we are in ok shape, > right? >
Clarification -- this is assuming we're using the "SequentiallyConsistent" setting in the LLVM backend to get full fences on each op, which correspond to the gcc-compatible __sync_* builtins: http://llvm.org/docs/Atomics.html#sequentiallyconsistent
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