sentences:  Once introduced in order to avoid delays in talking to main memory, the global register file has itself become a delay that is worth avoiding.Just as the delays talking to memory while its price fell suggested a radical change in ISA (Instruction Set Architecture) from CISC to RISC, designers are considering whether the problems scaling in parallelism and the increasing delays talking to registers demands another switch in basic ISA.Among the ways to introduce a new ISA are the very long instruction word (VLIW) architectures, typified by the Itanium.