[PATCH] [Power] Use AtomicExpandPass for fence insertion, and use lwsync where appropriate

Bill Schmidt wschmidt at linux.vnet.ibm.com
Fri Sep 5 08:38:46 PDT 2014

I've reviewed this against what gcc does, and your emitLeadingFence matches exactly.  As you've noted, what you're doing for emitTrailingFence is conservative.  GCC generates an isync in rs6000.c:rs6000_post_atomic_barrier() for these cases.

In short, the patch LGTM, and you can improve it later if desired.


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