This chapter concludes the book by taking a look at more recent developments in multiscalar processing. These include topics such as incorporating fault tolerance, the use of trace-based threads, hierarchical multiscalar processor, and a commercial implementation of the multiscalar processor. Fault tolerance can be easily incorporated at the PU level by executing the same thread in adjacent PUs and comparing the two sets of results. The use of trace-based threads reduces hardware complexity, and also allows threads to be formed at run-time, thereby providing object code compatibility. Features such as these are likely to provide an edge for the multiscalar paradigm in its quest for becoming the paradigm of choice for next-generation processors. The chapter concludes by covering a commercial implementation named Merlot from NEC.
KeywordsFault Tolerance Multiple Thread Control Flow Graph Conditional Branch Commercial Implementation
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