• Matthias Liedtke's avatar
    Revert "[maglev] Deopt on overflow in >>>" · 569e32af
    Matthias Liedtke authored
    This reverts commit 24e60017.
    
    Reason for revert: Change breaks maglev GC stress tests.
    
    Original change's description:
    > [maglev] Deopt on overflow in >>>
    >
    > Re-enable the int32 fast path for ShiftRightLogical, but account for
    > Maglev's missing signed/unsigned representation tracking by a)
    > removing rhs==0 as the identity value (a shift by 0 is still a
    > signed-unsigned conversion) and b) deoptimizing if the result cannot
    > be converted to a non-negative smi.
    >
    > Note this is not a deopt loop, since a non-smi result will change the
    > feedback to kSignedSmallInputs (from kSignedSmall).
    >
    > To fix this properly, we should track signed/unsigned representations
    > and convert the result to a heap number if it doesn't fit within smi
    > range.
    >
    > Bug: v8:7700
    > Change-Id: Ifd538d227a6f1290eb7f008d9bfad586ff91ea0f
    > Fixed: v8:13251
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3876366
    > Reviewed-by: Leszek Swirski <leszeks@chromium.org>
    > Commit-Queue: Jakob Linke <jgruber@chromium.org>
    > Cr-Commit-Position: refs/heads/main@{#83025}
    
    Bug: v8:7700
    Change-Id: Ibd4c29cc57b999e1cfcd040cee3228ea27a74029
    No-Presubmit: true
    No-Tree-Checks: true
    No-Try: true
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3876374
    Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
    Owners-Override: Leszek Swirski <leszeks@chromium.org>
    Commit-Queue: Matthias Liedtke <mliedtke@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#83029}
    569e32af
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