1840710 - Implement Wasm SIMD for Aarch32

Status: NEW

(Core :: JavaScript: WebAssembly, enhancement, P3)

Description

[Yury Delendik (:yury)]

Currently we don't support Wasm SIMD on ARM even if the CPU has Neon support. It is old Android devices, and per telemetry "we have 10% of Android users on ARM32" (bug 1823968). The implementation of SIMD for a single platform requires significant effort. It was not done yet.

The previous stance was the implementation will not be performant/efficient, and will be not beneficial to advertise that engine supports SIMD. Though SIMD support/implementations are coming as a standard for all Wasm engines. It can be beneficial to implement the Wasm SIMD for ARM7 even it performance will be about the same as without SIMD -- less profiles to support within apps.

Comment 1

[Yury Delendik (:yury)]

Attachment: WIP: Bug 1840710 - Prototype SIMD support for ARM.

Change how FloatRegisters set is packed.

Adds/stubs all SIMD masm/asm operations.

Comment 2

[Yury Delendik (:yury)]

Attachment: WIP: Bug 1840710 - Extend FloatRegisterSet to have SIMD registers.

Comment 3

[Marco Castelluccio [:marco]]

This would be required if we decide we want to support ARM32 as well for translations on Android.