[WalterBright]

"spilling" usually means a variable is sometimes in a register, sometimes on the stack. "Enregistering" means it is full time in a register.

[titzer]

But what's a variable, really? After SSA renaming, optimization, SSA deconstruction, then liveness analysis, coalescing, and finally live-range splitting, variables are history and the register allocator is only dealing with live ranges, typically.