Stream: git-wasmtime

Topic: wasmtime / PR #14104 fuzz: enable SIMD for Winch on aarch64

Wasmtime GitHub notifications bot (Aug 10 2026 at 15:13):

4ktLuffy requested wasmtime-fuzz-reviewers for a review on PR #14104.

Wasmtime GitHub notifications bot (Aug 10 2026 at 15:13):

4ktLuffy opened PR #14104 from 4ktLuffy:fuzz-winch-aarch64-simd to bytecodealliance:main:

The fuzz config disables SIMD for Winch on aarch64, but Winch has supported it since #13970, which updated the spec tests and docs/stability-tiers.md (simd → :check: for aarch64 Winch) without touching crates/fuzzing. The disable dates from #12646 in February.

Checked on aarch64-apple-darwin: Winch and Cranelift agree on v128.const / i32x4.add / i32x4.mul / i32x4.splat / extract_lane, and cargo fuzz run instantiate with Winch forced did 61,405 runs in 300s with no crashes.

wide_arithmetic and threads stay disabled — still :cross_mark: for Winch aarch64 in the tier table. The AVX check just above is unaffected on aarch64, since codegen_flag("has_avx") returns None there and is_some_and short-circuits.

Wasmtime GitHub notifications bot (Aug 10 2026 at 15:13):

4ktLuffy requested fitzgen for a review on PR #14104.

Wasmtime GitHub notifications bot (Aug 10 2026 at 15:38):

:thumbs_up: alexcrichton submitted PR review.

Wasmtime GitHub notifications bot (Aug 10 2026 at 15:38):

alexcrichton added PR #14104 fuzz: enable SIMD for Winch on aarch64 to the merge queue.

Wasmtime GitHub notifications bot (Aug 10 2026 at 16:04):

:check: alexcrichton merged PR #14104.

Wasmtime GitHub notifications bot (Aug 10 2026 at 16:04):

alexcrichton removed PR #14104 fuzz: enable SIMD for Winch on aarch64 from the merge queue.

Last updated: Aug 30 2026 at 09:07 UTC