• Seth Brenith's avatar
    Revert "[torque] Support bitfield structs stored within Smis" · 4dc1fb4e
    Seth Brenith authored
    This reverts commit e5e4ea96.
    
    Reason for revert: mysterious performance regression chromium:1052756
    
    Original change's description:
    > [torque] Support bitfield structs stored within Smis
    >
    > This change moves the definition of the bits stored in DebugInfo::flags
    > to Torque, and updates the only Torque usage of that field to use more
    > natural syntax. This is intended as an example of common patterns found
    > in various other classes. Several supporting changes are required:
    >
    > 1. Add a new type representing a bitfield struct stored within a Smi. It
    >    is currently called SmiTagged, but I'm open to suggestions.
    > 2. Add an enum-style output for Torque bitfield structs whose bitfields
    >    occupy only one bit each.
    > 3. Add a new case to MachineOperatorReducer that makes the generated
    >    code for IncBlockCounter match with what was generated before this
    >    change.
    > 4. Add support for reporting these bitfields in the postmortem debugging
    >    API. The format matches existing bitfields but with an offset value
    >    that includes the SMI shift size.
    >
    > Bug: v8:7793
    > Change-Id: Icaecbe4a162da55d2d9a3a35a8ea85b285b2f1b7
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2028832
    > Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
    > Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
    > Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#66182}
    
    Bug: chromium:1052756, v8:7793
    Change-Id: I9e2897efbb6321124bf4952cf09de2f179f7310d
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2062569
    Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
    Reviewed-by: 's avatarTobias Tebbi <tebbi@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#66349}
    4dc1fb4e
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