WebAssembly / simd

Branch of the spec repo scoped to discussion of SIMD in WebAssembly
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Fix usages of \extend in SIMD instructions #494

Closed ngzhian closed 3 years ago

ngzhian commented 3 years ago

\extend takes the bitwidth of type, but we have been passing the number of lanes, i.e. for i64x2, we should be passing 64, not 2.