WebAssembly is mostly about being a faster-to-parse version of asm.js. asm.js is an easier-to-optimize subset of Javascript. If it were easy to transform any ar

WebAssembly is mostly about being a faster-to-parse version of asm.js. asm.js is an easier-to-optimize subset of Javascript. If it were easy to transform any arbitrary Javascript into asm.js, then browser makers would just apply that transformation themselves (or more likely, write the optimizations so they don't target only a subset).