[PATCH] [OPENMP] CodeGen for "omp atomic read [seq_cst]" directive.

[John McCall]

Okay, so if it's not GCC, who exactly is already using libiomp5?  On a previous patch, I was told that we had to maintain compatibility with older runtimes, and it doesn't make sense to me that we have to support interoperation with old runtimes but not with generated code for any particular compiler that uses it.  So you really need to look to see how those compilers emit atomics.  That is, unless you're willing to break ABI with them as well, in which case we're effectively designing a new ABI, so why do we care about old runtimes at all?

I agree that it would be awful to be stuck using a global lock for all atomic operations, so if you *are* willing to break ABI, that's great.


http://reviews.llvm.org/D6431

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