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Lameed and Hendren thus propose and implement in McVM two dynamic techniques for optimizing \feval\ instructions:  \begin{itemize}  \item {OSR-based specialization:} when a loop containing an feval \feval\  becomes hot, an open  OSR is fired. triggered: the OSR handler invokes a code generator that creates a specialized version of the interrupted function and diverts control to the optimized version.  \end{itemize}  \ifdefined\fullver