setSlot(slot, VarLoc{1<<uint8(vReg.num) | last.Registers, last.StackOffset})
		}
	}
	return changed
}

// varOffset returns the offset of slot within the user variable it was
// decomposed from. This has nothing to do with its stack offset.
func varOffset(slot LocalSlot) int64 {
	offset := slot.Off
	s := &slot
	for ; s.SplitOf != nil; s = s.SplitOf {
		offset += s.SplitOffset
	}