This is what PNaCl (Portable Native Client) is trying to do. I'm skeptical though; PNaCl is still experimental in Chromium 29 (the current development version),

This is what PNaCl (Portable Native Client) is trying to do. I'm skeptical though; PNaCl is still experimental in Chromium 29 (the current development version), and requires the browser to download extra files outside of the Chromium package itself, probably because LLVM is quite bulky. If we're going to run high-performance code with the C memory model in a browser, I think asm.js is the best way to do it.