[spectext] Add double precision conversion

WebAssembly / simd

Branch of the spec repo scoped to discussion of SIMD in WebAssembly

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[spectext] Add double precision conversion #482

Closed ngzhian closed 3 years ago

ngzhian commented 3 years ago

Instructions were added in #383.

Consolidate conversion operations (vcvtop) more, merging int-int widening operations.

Drive-by fix extmul definition in syntax (shouldn't include the shape).

ngzhian commented 3 years ago

Rebased and force push to fix merge conflict. index-instructions.rst has some extadd instructions from #476 because I didn't properly add the generated index before merging.