WebAssembly / simd

Branch of the spec repo scoped to discussion of SIMD in WebAssembly
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[spectext] Add i64x2.widen_{low,high}_i32x4_{s,u} to syntax #447

Closed ngzhian closed 3 years ago

ngzhian commented 3 years ago

This is a simple change, validation and execution is already shape-agnostic, so we only need to add it to the syntax.

Instructions were merged in #290.