This CL introduces new operators JSFulfillPromise and JSPromiseResolve,
corresponding to the specification operations with the same name, and
uses that to lower calls to Promise.resolve() builtin to JSPromiseResolve.
We also optimize JSPromiseResolve and JSResolvePromise further based on
information found about the value/resolution in the graph. This applies
to both Promise.resolve() builtin calls and implicit resolve operations
in async functions and async generators.
On a very simple microbenchmark like
console.time('resolve');
for (let i = 0; i < 1e8; ++i) Promise.resolve({i});
console.timeEnd('resolve');
this CL reduces the execution time from around 3049ms to around 947ms,
which is a pretty significant 3x improvement. On the wikipedia benchmark
we observe an improvement around 2% with this CL.
Bug: v8:7253
Change-Id: Ic69086cdc1b724f35dbe83305795539c562ab817
Reviewed-on: https://chromium-review.googlesource.com/913488
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51387}
