• bmeurer's avatar
    [turbofan] Add initial support for global specialization. · e16dd13d
    bmeurer authored
    Introduce a new JSGlobalSpecialization advanced reducer that runs
    during the initial inlining and context specialization, and specializes
    the graph to the globals of the native context.  Currently we assume
    that we do not inline cross native context, but long-term we will grab
    the global object from the JSLoadGlobal/JSStoreGlobal feedback (with the
    new global load/store ICs that are currently in the workings), and then
    this whole specialization will be fully compositional even across
    cross-context inlining.
    
    Note that we cannot really handle most of the stores to global object
    property cells because TurboFan doesn't have a mechanism to enforce
    certain representations.  Also note that we cannot yet fully benefit
    from the type feedback collected on the global object property cells,
    because the type system cannot deal with maps in a reasonable way.
    
    CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_nosnap_rel
    R=jarin@chromium.org
    BUG=v8:4470
    LOG=n
    
    Committed: https://crrev.com/6fbf7903f94924ea066af481719898bd9667b6eb
    Cr-Commit-Position: refs/heads/master@{#31139}
    
    Review URL: https://codereview.chromium.org/1387393002
    
    Cr-Commit-Position: refs/heads/master@{#31148}
    e16dd13d
call-runtime-tail.js 2.08 KB