• bmeurer's avatar
    [turbofan] Properly optimize instanceof (even in the presence of @@hasInstance). · 241c024c
    bmeurer authored
    This is the TurboFan counterpart of http://crrev.com/2504263004, but it
    is a bit more involved, since in TurboFan we always inline the appropriate
    call to the @@hasInstance handler, and by that we can optimize a lot more
    patterns of instanceof than Crankshaft, and even yield fast instanceof
    for custom @@hasInstance handlers (which we can now properly inline as
    well).
    
    Also we now properly optimize Function.prototype[@@hasInstance], even if
    the right hand side of an instanceof doesn't have the Function.prototype
    as its direct prototype.
    
    For the baseline case, we still rely on the global protector cell, but
    we can address that in a follow-up as well, and make it more robust in
    general.
    
    TEST=mjsunit/compiler/instanceof
    BUG=v8:5640
    R=yangguo@chromium.org
    
    Review-Url: https://codereview.chromium.org/2511223003
    Cr-Commit-Position: refs/heads/master@{#41092}
    241c024c
instanceof.js 2.54 KB