
Our goal is to dramatically increase the performance of uniprocessors through the exploitation of instruction level parallelism, i.e. that parallelism which exists amongst the machine instructions of a program. Speculative execution may help a lot, but, it is argued, both branch prediction and eager execution are insufficient to achieve performances in speedup factors in the tens (with respect to sequential execution), with reasonable hardware costs. A new form of code execution, Disjoint Eager Execution (DEE), is proposed which uses less hardware than pure eager execution, and has more performance than pure branch prediction; DEE is a continuum between branch prediction and eager execution. DEE is shown to be optimal, when processing resources are constrained. Branches are predicted in DEE, but the predictions should be made in parallel in order to obtain high performance. This is not allowed, however, by the use of the standard instruction stream model, the dynamic model (the order is as indicated by the contents of the Program Counter). The use of the static instruction stream is proposed instead. The static instruction stream oreder is the same as the order of the code in memory, and is independent of the execution of branches. It allows reduced branch dependencies, as well. It is argued that a new version, Levo, of an old machine model, CONDEL-2, will be able to attain massive Instruction Level Parallelism.
| citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 5 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Average | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Average |
