• Nico Hartmann's avatar
    Revert "Faster JS-to-Wasm calls" · de50785e
    Nico Hartmann authored
    This reverts commit 860fcb1b.
    
    Reason for revert: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux%20-%20arm%20-%20sim%20-%20lite/13831/overview
    
    Original change's description:
    > Faster JS-to-Wasm calls
    >
    > This replaces https://chromium-review.googlesource.com/c/v8/v8/+/2376165/.
    >
    > Currently JS-to-Wasm calls go through a wrapper/trampoline, built on
    > the basis of the signature of a Wasm function to call, and whose task
    > is to:
    > - set "thread_in_wasm_flag" to true
    > - convert the arguments from tagged types into Wasm native types
    > - calculate the address of the Wasm function to call and call it
    > - convert back the result from Wasm native types into tagged types
    > - reset "thread_in_wasm_flag" to false.
    >
    > This CL tries to improve the performance of JS-to-Wasm calls by
    > inlining the code of the JS-to-Wasm wrappers in the call site.
    >
    > It introduces a new IR operand, JSWasmCall, which replaces JSCall for
    > this kind of calls. A 'JSWasmCall' node is associated to
    > WasmCallParameters, which contain information about the signature of
    > the Wasm function to call.
    >
    > WasmWrapperGraphBuilder::BuildJSToWasmWrapper is modified to avoid generating code to convert the types for the arguments
    > of the Wasm function, when the conversion is not necessary.
    > The actual inlining of the graph generated for this wrapper happens in
    > the simplified-lowering phase.
    >
    > A new builtin, JSToWasmLazyDeoptContinuation, is introduced to manage
    > lazy deoptimizations that can happen if the Wasm function callee calls
    > back some JS code that invalidates the compiled JS caller function.
    >
    > Bug: v8:11092
    > Change-Id: I3174c1c1f59b39107b333d1929ecc0584486b8ad
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2557538
    > Reviewed-by: Igor Sheludko <ishell@chromium.org>
    > Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
    > Reviewed-by: Georg Neis (ooo until January 5) <neis@chromium.org>
    > Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
    > Reviewed-by: Maya Lekova <mslekova@chromium.org>
    > Reviewed-by: Andreas Haas <ahaas@chromium.org>
    > Commit-Queue: Paolo Severini <paolosev@microsoft.com>
    > Cr-Commit-Position: refs/heads/master@{#71824}
    
    TBR=neis@chromium.org,ahaas@chromium.org,jgruber@chromium.org,tebbi@chromium.org,ishell@chromium.org,mslekova@chromium.org,nicohartmann@chromium.org,paolosev@microsoft.com
    
    Change-Id: I214cbdee74c1a2aaad907ffc84662ed25631983e
    No-Presubmit: true
    No-Tree-Checks: true
    No-Try: true
    Bug: v8:11092
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2595438Reviewed-by: 's avatarNico Hartmann <nicohartmann@chromium.org>
    Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#71825}
    de50785e
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