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2014 Mar 07
3
[LLVMdev] [RFC] Add second "failure" AtomicOrdering to cmpxchg instruction
Hi all,
The C++11 (& C11) compare_exchange functions with explicit memory
order allow you to specify two sets of semantics, one for when the
exchange actually happens and one for when it fails. Unfortunately, at
the moment the LLVM IR "cmpxchg" instruction only has one ordering,
which means we get sub-optimal codegen.
This probably affects all architectures which use