WebAssembly Bulk Memory Operations

Category: JavaScript
Type: New or changed feature
Status: Enabled by default (Chrome 75)
Intent stage: Prepare to ship

Breaking change: No
Enterprise impact: None
Spec maturity: Incubation
Web Platform Tests: No

WPT details: WebAssembly core tests here: https://cs.chromium.org/chromium/src/v8/test/mjsunit/wasm/bulk-memory-spec/. WPT doesn't currently have wasm core tests.

Summary

Adds a memmove type opcode to WebAssembly and enhances existing data sections to support importable base.This allows better optimization of large memcpy/memmove operations. Data section improvement will make shared libraries work better, especially with threads.

Standards & signals

Specification: https://github.com/WebAssembly/bulk-memory-operations
Firefox: In development
Safari: No signal
Web developers: No signals
Tracking bug: https://bugs.chromium.org/p/v8/issues/detail?id=7747

Ecosystem

Web Platform Tests: https://wpt.fyi/results/?q=webassembly-bulk-memory-operations
Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+WebAssembly%20Bulk%20Memory%20Operations
MDN Web Docs: https://developer.mozilla.org/en-US/search?q=WebAssembly%20Bulk%20Memory%20Operations
Baseline status: https://webstatus.dev/?q=WebAssembly%20Bulk%20Memory%20Operations

Docs: https://github.com/WebAssembly/bulk-memory-operations/blob/master/proposals/bulk-memory-operations/Overview.md

Explainers: https://github.com/WebAssembly/bulk-memory-operations/blob/master/proposals/bulk-memory-operations/Overview.md

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