• bmeurer's avatar
    [ic] Also collect known map for relational comparison. · e56f265f
    bmeurer authored
    Previously we only collected the known map for equality comparisons. But
    if we also collect it for relational comparisons, we can inline a fast
    path of ToPrimitive on the objects, which is especially interesting
    since both sides have the same map.
    
    For now we only inline a very limited subset of ToPrimitive in
    Crankshaft, which is when the receiver map (and its prototype chain)
    doesn't have @@toPrimitive, and both valueOf and toString are the
    default versions on the %ObjectPrototype%. In this case the relational
    comparison would reduce to a string comparison of "[object CLASS]" with
    itself and so we can reduce that to a boolean constant plus map checks
    on both left and right hand side, plus code dependencies on the
    prototype chain. This repairs the regression on box2d.
    
    R=jkummerow@chromium.org
    BUG=chromium:534200
    LOG=n
    
    Review URL: https://codereview.chromium.org/1355113002
    
    Cr-Commit-Position: refs/heads/master@{#30852}
    e56f265f
compare-known-objects-slow.js 3.33 KB