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    [Interpreter] Optimize equality check with null/undefined with a check on the map. · 9119d169
    mythria authored
    Equality with null/undefined is equivalent to a check on the undetectable bit
    on the map of the object. This would be more efficient than performing the entire
    comparison operation.
    
    This cl introduces:
    1. A new bytecode called TestUndetectable that checks if the object is null/undefined.
    2. Updates peeophole optimizer to emit TestUndetectable when a LdaNull/Undefined
    precedes equality check.
    4. TestUndetectable is transformed to ObjectIsUndetectable operator when building
    turbofan graph.
    
    BUG=v8:4280
    
    Review-Url: https://codereview.chromium.org/2547043002
    Cr-Commit-Position: refs/heads/master@{#41514}
    9119d169
bytecodes.h 41.8 KB