Bug 249038

Summary:	[WebAssembly SIMD] Emulate vector floating-point absolute value on Intel
Product:	WebKit	Reporter:	David Degazio <d_degazio>
Component:	WebAssembly	Assignee:	David Degazio <d_degazio>
Status:	RESOLVED FIXED
Severity:	Normal	Keywords:	InRadar
Priority:	P2
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
Bug Depends on:
Bug Blocks:	246345

Description David Degazio 2022-12-09 11:55:12 PST

Intel doesn't have an instruction for SIMD floating-point absolute value, so the WASM f32x4.abs and f64x2.abs opcodes are currently unsupported. We can emulate this feature by generating a vector bitmask and using it to clear the sign bits for all elements in a vector.

Comment 1 David Degazio 2022-12-09 11:56:52 PST

rdar://103189245

Comment 2 David Degazio 2022-12-09 12:40:46 PST

Pull request: https://github.com/WebKit/WebKit/pull/7402

Comment 3 EWS 2022-12-13 11:48:24 PST

Committed 257806@main (e2d9691a6968): <https://commits.webkit.org/257806@main>

Reviewed commits have been landed. Closing PR #7402 and removing active labels.