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% !TEX root = article.tex  On-Stack Replacement (OSR) is a technique for dynamically diverting transferring  execution between different versions of a function at run time. %suspending the execution of a function and continuing with a different version of the code.   OSR is typically used in virtual machines to interrupt a long-running function and recompile it at a higher optimization level, or to replace it with a different one when a speculative assumption made during its compilation no longer holds.