Wasmtime Files

31.0.0

Released 2025-03-20.

Added

• Winch's implementation of the SIMD proposal for WebAssembly is now feature-complete (but still being fuzzed). #10180 #10170 #10203 #10202 #10210 #10213 #10224 #10205 #10226 #10228 #10236 #10241 #10243 #10247 #10271 #10284 #10288 #10296

• The pytorch implementation in wasmtime-wasi-nn now has GPU support. #10204

• Cranelift now supports emitting the AArch64 extr instruction. #10229

• Cranelift now supports emitting the x64 shld instruction. #10233

• Initial support for the stack-switching proposal has started to land, but it is not complete just yet. #10251 #10265 #10255

Changed

• Pulley's implementation of loads/stores to linear memory has changed to better support optimizations and reduction of interpreter opcodes in the final binary. #10154

• Cranelift's verifier now ensures that integers used as address types have the correct width. #10209

• Wasmtime and Cranelift's minimum supported version of Rust is now 1.83.0. #10264

• Wasmtime now mentions the filename when the input cannot be opened on the CLI. #10292

• All types are now generated in component::bindgen!, even if they're not reachable. #10311

• Tables allocated with the system allocator now use alloc_zeroed (aka calloc) for allocation. #10313

Fixed

• GC: the is-null-or-i31ref checks have been fixed. #10221

• GC: an incorrect assertion and canonicalized types for runtime usage has been fixed. #10223

• GC: subtype checks for imported globals during instantiation have been fixed. #10304

• GC: exposing references to wasm in the gc_alloc_raw libcall has been fixed. #10322

• Winch's fuel checks correctly sync fuel before the check now. #10231

• Winch's treatment of stores and other trapping ops has been fixed on AArch64. #10201

• Winch's handling of the shadow stack pointer has been fixed on AArch64. #10263

• Winch's handling of address calculations has been fixed on AArch64. #10297

• Winch's handling of multivalue return of constants has ben fixed. #10315