Dynamically scheduling VLIW instructions
Very long instruction word (VLIW) machines potentially provide the most direct way to exploit instruction-level parallelism; however, they cannot be used to emulate current general-purpose instruction set architectures. In addition, programs scheduled for a particular implementation of a VLIW model cannot be guaranteed to be binary compatible with other implementations of the same machine model with a different number of functional units or functional units with different latencies. This paper describes-an architecture, named dynamically trace scheduled VLIW (DTSVLIW), that can be used to implement machines that execute code of current RISC or CISC instruction set architectures in a VLIW fashion, with backward code compatibility. Preliminary measurements of the DTSVLIW performance, obtained with an execution-driven simulator running the SPECint95 benchmark suite, are also presented. (C) 2000 Academic Press.
vliw dtsvliw dynamic instruction scheduling ilp