Comment by masklinn

Except FJCVTZS is not exclusively useful to javascript. Its behaviour is that of x86 rounding, which is what the JS spec encodes. So it’s also useful for x86 emulation / compatibility in general.

> If WebAssembly gets popular enough there will probably be hardware acceleration for it.

ARM already tried that back in the days with Jazelle. Plus much of the point of WASM is that you can compile it to machine code during loading.