Compile time code paths

[Jeremie Pelletier]

If a function has both an asm and D implementations inside its body, and the D 
version can be executed at compile time, but the asm one is much faster at 
runtime. Is it possible to have the compiler use the D code path at compile 
time (ie to fill in enums and whatnot), and have the asm version available at 
runtime.