Properties of Rescheduling Size Invariance for Dynamic Rescheduling-Based VLIW Cross-Generation Compatibility

The object-code compatibility problem in VLIW architectures stems from their statically scheduled nature. Dynamic rescheduling (DR) [1] is a technique to solve the compatibility problem in VLIWs. DR reschedules program code pages at rst-time page faults i.e., when the code pages are accessed for the rst time during execution. Treating a page of code as the unit of rescheduling makes it susceptible to hazard of changes in the page-size during the process of rescheduling. This paper proves that the changes in the page-size are only due to insertion and/or deletion of NOPs in the code. Further, it presents an ISA encoding called list encoding, which does not require explicit encoding of the NOPs in the code. A property of the encoding called rescheduling-size invariance (RSI) is presented and it is proved that the list encoding satis es this property.