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Asm.js is lower level than LLVM IR. In LLVM IR the data structures and memory allocation are still visible, in asm.js it's just opaque code working on a giant h
by jules 13y ago
Asm.js is lower level than LLVM IR. In LLVM IR the data structures and memory allocation are still visible, in asm.js it's just opaque code working on a giant heap array. For example think how you'd do pointer analysis on asm.js...
- pcwalton 13y agoThe optimizations are already done ahead of time, by Emscripten. There is no need to do them on the client, and doing so just increases compilation time for no reason. In fact, shipping the types to the client is harmful, because it increases the download size. This is one of the ways asm.js is, IMHO, a better bytecode than LLVM IR…
- Zarel 13y ago> In fact, shipping the types to the client is harmful, because it increases the download size To be fair, it's probably negligible compared to the download size impact of representing bytecode in a subset of JavaScript.