• Benedikt Meurer's avatar
    [turbofan] Optimize index checking for DataView accesses. · 69985ac5
    Benedikt Meurer authored
    Use CheckBounds and reduce the number of checks required to sanitize the
    indices for DataView accesses in optimized code. Also constant-fold the
    [[ByteLength]] if the DataView is a known compile-time constant (similar
    to what we do for TypedArrays already). This further improves performance
    of DataViews by 2-7% depending on the exact test case.
    
    With this change DataView and TypedArray accesses themselves are mostly
    on par performance wise.
    
    Since this CL introduces proper CheckBounds for the DataViews, instead
    of the hand-craftet bounds checks, it is expected to regress performance
    when untrusted code mitigations are on, since DataViews are also guarded
    in optimized now. Without untrusted code mitigations, there's no negative
    performance impact.
    
    Tbr: sigurds@chromium.org
    Bug: chromium:225811, chromium:876005
    Change-Id: I4a69f81124635c9ba2c7e4c2dc912e2fd601061a
    Reviewed-on: https://chromium-review.googlesource.com/1186408Reviewed-by: 's avatarBenedikt Meurer <bmeurer@chromium.org>
    Reviewed-by: 's avatarSigurd Schneider <sigurds@chromium.org>
    Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#55346}
    69985ac5
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