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    • Daniel Clifford's avatar
      [ignition] Optimize reloading of registers before Dispatch · bd21c2bd
      Daniel Clifford authored
      Before this patch, the registers needed for bytecode dispatch in interpreter
      handlers were inconsistently stored in the interpreter frame and/or kept in
      values that remained live across calls.
      
      After this patch, these registers are explicitly reloaded after calls, making it
      possible to elide the spills of those registers before the call in many cases.
      
      Some highlights from the CL:
      
      * Added methods to the CSA and InterpreterAssembler to efficiently store and
        load Smis values and Smi interpreter registers on x64 without explicit
        tagging/untagging.
      
      * Created Variables for all of the interpreter-internal values that need to be
        reloaded before bytecode dispatch at the end of an interpreter handler.
      
      * The bytecode offset can be written out early in a handler by marking it
        has having a call along it's critical path. By moving this early in a
        handler, it becomes possible to use memory operands for pushes used to
        marshall parameters when making calls.
      
      Change-Id: Icf8d7798789f88a4489e06a7092616bbbb881577
      Reviewed-on: https://chromium-review.googlesource.com/442566
      Commit-Queue: Daniel Clifford <danno@chromium.org>
      Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
      Reviewed-by: 's avatarMichael Starzinger <mstarzinger@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#43260}
      bd21c2bd
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