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\fi  \paragraph{x86-64 Lowering.}  The final step to be performed before execution is native code generation for {\tt isordfrom}, {\tt isordstub}, and {\tt isordto}. In \myfigure\ref{fig:isordx86-64}. \myfigure\ref{fig:isordx86-64} shows.  \subsection{Instrumentation API}  \label{se:instrum-api}