• Santiago Aboy Solanes's avatar
    [interpreter] Merge nested loops that share the same header offset · 18b4b6b9
    Santiago Aboy Solanes authored
    This CL merges nested loops that share the same header offset with its
    parent loop, by not emitting JumpLoop bytecode for these inner loops.
    Instead, we generate a Jump to its parent's JumpToHeader (which in
    turn can be a JumpLoop or another Jump to its parent's JumpToHeader).
    
    Originally, every loop had a unique first Bytecode to jump to. Since
    IterationBody StackChecks are going to become implicit this will no
    longer be the case.
    
    As a note, this CL just sets the foundation that the follow-up CLs
    will build on top of. Since we have explicit StackChecks, and they
    are at the beginning of loops we do not have nested loops as of now.
    
    Bug: v8:10149, v8:9960
    Change-Id: I6daee4d2c6d6216f022228c87c4aa74e163997b2
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2062390
    Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
    Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
    Reviewed-by: 's avatarJakob Gruber <jgruber@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#66626}
    18b4b6b9
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