[wasm] Bail R2R for all SIMD parameter sizes, not just SIMD16#130391
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Vector2 (TYP_SIMD8) and Vector3 (TYP_SIMD12) parameters are lowered to
i32 in the wasm signature, the same as Vector128 (TYP_SIMD16), but the
argument-spill prolog only bailed R2R for TYP_SIMD16. As a result a
method with an 8-byte SIMD parameter (e.g. System.Numerics.Matrix3x2
.CreateRotation(float, Vector2)) emitted an f64.store fed by the i32
parameter local, producing an invalid module that fails wasm
validation ("type mismatch: expected f64, found i32").
Broaden the parameter bail in genBeginFnProlog from `== TYP_SIMD16` to
`varTypeIsSIMD(...)` so SIMD8/SIMD12/SIMD16 parameters are all sent to
the interpreter until SIMD parameters are supported in the wasm calling
convention. This is a follow-up to the SIMD16 bail added in dotnet#130101 and
lets System.Private.CoreLib produce a valid R2R image.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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Pull request overview
This PR updates the WASM JIT’s R2R-bail logic to treat all SIMD-typed parameters (e.g., TYP_SIMD8/TYP_SIMD12/TYP_SIMD16) as unsupported for WASM ReadyToRun codegen, ensuring crossgen2 doesn’t emit invalid WASM modules when such parameters are present.
Changes:
- Broadened the prolog check from
TypeGet() == TYP_SIMD16tovarTypeIsSIMD(TypeGet()), so any SIMD parameter triggersNYI_WASM_SIMD(...). - Updated the associated comment and NYI message to reflect the generalized “SIMD parameter” behavior.
AndyAyersMS
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Jul 9, 2026
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Hopefully we get ABI support for SIMD types soon.
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/ba-g x64 timeouts are not related to wasm only change |
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Vector2 (
TYP_SIMD8) and Vector3 (TYP_SIMD12) parameters are lowered toi32in the wasm signature, the same as Vector128 (TYP_SIMD16), but the argument-spill prolog ingenBeginFnPrologonly bailed R2R forTYP_SIMD16.As a result, a method with an 8-byte SIMD parameter — e.g.
System.Numerics.Matrix3x2.CreateRotation(float, Vector2)— emitted anf64.storefed by thei32parameter local, producing an invalid module that fails wasm validation:This currently prevents
System.Private.CoreLibfrom producing a valid R2R image (both single-file and composite).Fix
Broaden the parameter bail from
== TYP_SIMD16tovarTypeIsSIMD(...)soSIMD8/SIMD12/SIMD16parameters are all sent to the interpreter until SIMD parameters are supported in the wasm calling convention.This is a direct follow-up to the SIMD16 parameter bail added in #130101 ("Fix a few missing SIMD bail outs that prevent SPC from validating") — it was the same class of bug, just missed for the smaller SIMD sizes.
Validation
With this change, crossgen2
--targetos wasi --targetarch wasmonSystem.Private.CoreLib(and a composite including it) produces a module that passeswasm-tools validate --features all. Verified locally on macOS/arm64.Note
This change was authored with the assistance of GitHub Copilot.