As of Firefox 155, we intend to enable the WebAssembly wide arithmetic
proposal by default on all platforms.
*Summary:*
This proposal adds four new numeric instructions to WebAssembly that
perform 128-bit integer arithmetic: `i64.add128`, `i64.sub128`,
`i64.mul_wide_s`, and `i64.mul_wide_u`. These instructions are useful
for improving the performance of some workloads.
*Bugs:*
Tracker: https://bugzilla.mozilla.org/show_bug.cgi?id=wasm-wide-arithmetic
Enable by default: https://bugzilla.mozilla.org/show_bug.cgi?id=2062374
*Specification:*
https://github.com/WebAssembly/wide-arithmetic/
*Standards Body:*
W3C (WebAssembly CG & WG)
*Platform Coverage:*
All platforms
*Preference:*
javascript.options.wasm_wide_arithmetic
*DevTools Bug:*
N/A
*Extensions Bug:*
N/A
*Use Counter:*
N/A
*Standards-Position Discussion:*
None, covered by our blanket policy for Wasm proposals.
*Other Browsers:*
- Blink: Implemented, not yet shipped
(https://chromium-review.googlesource.com/c/v8/v8/+/7639297)
- WebKit: Implemented, not yet shipped
(https://bugs.webkit.org/show_bug.cgi?id=312213)
*web-platform-tests:*
None yet, but we run the official spec tests that will eventually be
upstreamed into WPT.
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