On Dec 6, 2011, at 12:32 AM, Chris Lattner wrote: > > On Dec 5, 2011, at 7:44 PM, Dan Gohman wrote: > >> operands and opcodes. It's quite magical. > > It's actually not that magical. It's not magical from an LLVM perspective. But it is one of the areas where the popular mental model of LLVM IR as an assembly language breaks down. Undef is weirder than PHI nodes. Dan