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PHP is the dominant server-side scripting language used to implement dynamic web content. Just-in-time compilation, as implemented in Facebook's state-of-the-art HipHopVM, helps mitigate the poor performance of PHP, but substantial overheads remain, especially for realistic, large-scale PHP applications. This paper analyzes such applications and shows that there is little opportunity for conventional...
In this work, we explore global history register (GHR) implementations for Tagged Geometric length (TAGE) style branch predictors with speculative updates. We break down the requirements to both update and recover TAGE predictors' history registers during normal operation and after mispeculation, discussing where various designs exhibit large checkpoint and/or operation overheads. To reduce these...
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