34de39bfab
Make calls like new Array(n) new A(n) (where A is a subclass of Array) inlinable into TurboFan. We do this by speculatively checking that n is an unsigned integer that is not greater than JSArray::kInitialMaxFastElementArray, and then lowering the backing store allocation to a builtin call. The speculative optimization is either protected by the AllocationSite for the Array constructor invocation (if we have one), or by a newly introduced global protector cell that is used for Array constructor invocations that don't have an AllocationSite, i.e. the ones from Array#map, Array#filter, or from subclasses of Array. Next step will be to implement the backing store allocations inline in TurboFan, but that requires Loop support in the GraphAssembler, so it's done as a separate CL. This should further boost the performance. This boosts the ARES6 ML benchmark by up to 8% on the steady state, and also improves monomorphic Array#map calls by around 20-25% on the initial setup. Bug: v8:6399 Tbr: ulan@chromium.org Change-Id: I7c8bdecf7c814ce52db6ee3051c3206a4f7d4bb6 Reviewed-on: https://chromium-review.googlesource.com/704639 Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org> Reviewed-by: Michael Stanton <mvstanton@chromium.org> Cr-Commit-Position: refs/heads/master@{#48348} |
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| benchmarks | ||
| cctest | ||
| common | ||
| debugger | ||
| fuzzer | ||
| inspector | ||
| intl | ||
| js-perf-test | ||
| memory | ||
| message | ||
| mjsunit | ||
| mkgrokdump | ||
| mozilla | ||
| preparser | ||
| promises-aplus | ||
| test262 | ||
| unittests | ||
| wasm-spec-tests | ||
| webkit | ||
| bot_default.gyp | ||
| bot_default.isolate | ||
| BUILD.gn | ||
| default.gyp | ||
| default.isolate | ||
| optimize_for_size.gyp | ||
| optimize_for_size.isolate | ||
| perf.gyp | ||
| perf.isolate | ||