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\begin{enumerate}  \item An analysis pass for \feval\ instructions in the IIR representation of a function  \item An extension for the IIR compiler to track the correspondence between IIR and IR objects at \feval\ calls  \item An inserter component to insert OSR points in the IRgenerated  for IIR locations annotated during the analysis pass \item A callback optimizer triggered at OSR points, which in turn is made of:  \begin{enumerate}  \item A profile-driven IIR generator to replace \feval\ calls with direct calls