search for: __c11_compare_exchange_strong

...e optimisation opportunities that LLVM *would* be able to exploit if it saw the control flow earlier. For example the return value of the C++11 and C11 compare_exchange operations is actually whether the exchange succeeded, which leads to some common idioms in Clang-produced IR. >From "if(__c11_compare_exchange_strong(...))": %loaded = cmpxchg i32* %addr, i32 %oldval, i32 %newval seq_cst seq_cst %success = icmp eq i32 %loaded, %oldval br i1 %success, label %true, label %false the control-flow here should be something like: loop: %loaded = load linked i32* %addr seq_cst %trystore...