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\paragraph{OSR Instrumentation.}  We use deferred compilation by instrumenting {\tt isord} in \tinyvm\ with an open OSR 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, incrementing the hotness counter {\tt p.osr} and jumping 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}). Notice that maintaining the SSA form requires adjusting phi nodes. The stub (see \myfigure[...]) calls a code generator that that:  1) builds an optimized version of {\tt isord} by inlining the comparator comparator,  and 2) uses it to create the continuation function {\tt isordto} shown in \myfigure\ref{fig:isordascto}. \paragraph{Generation of Notice that instrumentation replaces  the Continuation Function.}  [...] function entry point, removes dead code, replaces live variables with the function parameters, and fixes phi nodes accordingly. Additions resulting from the IR instrumentation are in grey, while removals are struck-through.  \paragraph{x86-64 Lowering.}  [...]