• Sathya Gunasekaran's avatar
    Revert "[wasm] Refactor AtomicWait implementation" · 9945e908
    Sathya Gunasekaran authored
    This reverts commit 77d4e230.
    
    Reason for revert: verify csa build bot broken
    https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20verify%20csa/16218?
    
    Original change's description:
    > [wasm] Refactor AtomicWait implementation
    > 
    > The existing implementation included aspects that are not
    > straight-forward to implement in Liftoff and seemed inefficient:
    > * Convert the timeout in WebAssembly code from I64 to F64, just to
    >   convert it back in the runtime.
    >   * On 32-bit platforms this conversion needs an additional C-call.
    > * Split the I64 expected value from I64 into two I32 values in the
    >   wasm-compiler.
    >   * Ideally the int64-lowering takes care of 32-bit specific handling.
    > 
    > With this CL the timeout and the expected value are passed as I64 to
    > the runtime (a builtin moves the I64 into a bigint for that). The
    > int64-lowering takes care of 32-bit platforms. There are special
    > builtins for 32-bit platforms, but they are written such that ideally
    > also the int64-lowering could create them.
    > 
    > R=​jkummerow@chromium.org, binji@chromium.org
    > 
    > Bug: v8:10108
    > Change-Id: I2dbba5839779961b1c5bde4c23fc3f38f1895a52
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2071867
    > Commit-Queue: Andreas Haas <ahaas@chromium.org>
    > Reviewed-by: Clemens Backes <clemensb@chromium.org>
    > Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
    > Reviewed-by: Ben Smith <binji@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#66497}
    
    TBR=binji@chromium.org,jkummerow@chromium.org,ahaas@chromium.org,clemensb@chromium.org
    
    Change-Id: If284aa07eedddd2fbea4df8c53c7d371cac1d42e
    No-Presubmit: true
    No-Tree-Checks: true
    No-Try: true
    Bug: v8:10108
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2080250Reviewed-by: 's avatarSathya Gunasekaran  <gsathya@chromium.org>
    Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#66498}
    9945e908
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