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\paragraph{OSR Instrumentation in IR.}  To defer the compilation of the continuation function until the comparator is known at run time, we used \osrkit\ to instrument {\tt isord} with an open OSR point at the beginning of the loop body, as shown in \myfigure\ref{fig:isordfrom}. Portions added to the original code by OSR istrumentation are highlighted in grey.  %The figure illustrates how the original {\tt isord} code is instrumented by \tinyvm, highlighting in grey the added portions.   A new basic block is placed at the beginning of the loop body, which increments a hotness counter {\tt p.osr} and jumps to an OSR-firing block if the counter reaches the threshold (1000 iterations in this example). The OSR block contains a tail call to the target generation stub, which receives as parameters the four live variables at the OSR point ({\tt v}, {\tt n}, {\tt i}, {\tt c}). An additional user-defined pointer may be used to provide the stub with profile data collected in the base function. function (none in this example).  Notice that maintaining the SSA form requires \osrkit\ to adjust $\phi$-nodes. The stub (see \myfigure\ref{fig:isordstub}) calls a code generator that: 1) builds an optimized version of {\tt isord} by inlining the comparator (which is known when the OSR is fired), and 2) uses it to create the continuation function {\tt isordto} shown in \myfigure\ref{fig:isordascto}. The stub passes to the code generator as built-in parameters: 1) a pointer to the {\tt isord} IR code, a pointer to the  basic block in {\tt isord} from which the OSR is fired, and 3) the LLVM context for code generation. The stub terminates with a tail call to {\tt isordto}. To generate the continuation function from the optimized version created by the inliner, \osrkit\ replaced the function entry point, removed dead code, replaced live variables with the function parameters, and fixed $\phi$-nodes accordingly. Additions resulting from the IR instrumentation are in grey, while removals are struck-through. \ifdefined\noauthorea  \begin{figure}[t]