• bmeurer's avatar
    [turbofan] Add new JSFrameSpecialization reducer. · b0a852e8
    bmeurer authored
    The JSFrameSpecialization specializes an OSR graph to the current
    unoptimized frame on which we will perform the on-stack replacement.
    This is used for asm.js functions, where we cannot reuse the OSR code
    object anyway because of context specialization, and so we could as well
    specialize to the max instead.
    
    It works by replacing all OsrValues in the graph with their values in
    the JavaScriptFrame.
    
    The idea is that using this trick we get better performance without
    doing the unsound backpropagation of types to OsrValues later. This is
    the first step towards fixing OSR for TurboFan.
    
    R=jarin@chromium.org
    BUG=v8:4273
    LOG=n
    
    Review URL: https://codereview.chromium.org/1225683004
    
    Cr-Commit-Position: refs/heads/master@{#29476}
    b0a852e8
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