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In this section we discuss our implementation of the approach described in \mysection\ref{se:overview} in \tinyvm, a proof-of-concept virtual machine we developed as a playground to exercise our OSR techniques. TinyVM is based on LLVM's MCJIT compiler and supports interactive invocation of LLVM IR functions either generated at run-time or loaded from disk. The main design goal behind TinyVM is the creation of an interactive environment for IR manipulation and JIT-compilation of functions: for instance, it allows the user to insert OSR points in loaded functions, run optimization passes on them or display their CFGs, repeatedly invoke a function for a specified amount of times and so on. TinyVM supports dynamic library loading and linking, and comes with a helper component for MCJIT that simplifies tasks such as handling multiple IR modules, symbol resolution in presence of multiple versions of a function, and tracking native code and other machine-level generated object such as Stackmaps.  To explain how OSR can be encoded in IR, we consider the toy example of \myfigure\ref{fi:isord-example}. Function {\tt isord} checks whether an array of numbers is sorted according to some ordering given by a comparator. The scenario we explore is profile-driven optimization, where we dynamically divert control to a faster version if the number of iterations exceeds a certain threshold. To achieve this goal, we use deferred compilation by instrumenting {\tt isord} in \tinyvm\ with an open OSR, OSR at the beginning of the loop body,  as shown in \myfigure\ref{fig:isordfrom}. The %To place an open OSR, \tinyvm\ requires the following pieces of information: 1) a pointer to the   %LLVMContext& Context, OSRLibrary::OpenOSRInfo& info,  % OSRLibrary::OSRCond& cond, Value* profDataVal, OSRLibrary::DestFunGenerator destFunGenerator,  % std::vector *valuesToTransfer, OSRLibrary::OSRPointConfig &config  %Function* src, BasicBlock* src_bb, std::string* F1NewName, OSRLibrary::OSRCond &cond, int branchTakenProb  %OSR instrumentation produces function {\tt isordfrom} obtained from {\tt isord} by including   %includes extra code (in grey) that increments a counter ,   %The  generated stub calls a function inliner that generates a version of {\tt isord} where the comparator's body, pointed to by live variable {\tt c_osr}, is inlined in the loop body. The optimized version {\tt isordto} is shown in \myfigure\ref{fig:isordascto}. \ifdefined\noauthorea  \begin{figure}[t]