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\label{fig:isordascto}OSR instrumentation at  LLVM IR level (in grey) version  of faster variant {\tt isordasc} (\myfigure\ref{fi:isord-example}). (\myfigure\ref{fi:isord-example}) instrumented for OSR. Instrumentation additions are in grey.  The original function entry block is unreachable after instrumentation and is eliminated (struck-through code fragments).