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Each execution unit is not a separate processor (or a core if the processor is a multi-core processor), but an execution resource within a single CPU such as an arithmetic logic unit. While a superscalar CPU is typically also pipelined , superscalar and pipelining execution are considered different performance enhancement techniques.
Because the wave-like propagation of data through a systolic array resembles the pulse of the human circulatory system, the name systolic was coined from medical terminology. A significant benefit of systolic arrays is that all operand data and partial results are contained within (passing through) the processor array.
A wide-issue architecture is a computer processor that issues more than one instruction per clock cycle. [1] They can be considered in three broad types: Statically-scheduled superscalar architectures execute instructions in the order presented; the hardware logic determines which instructions are ready and safe to dispatch on each clock cycle.
A superscalar processor allows the execution of a number of instructions simultaneously in the core of the processor itself, although this behavior is not to be confused with a multi-processor system. Most modern processors are superscalar. In a superscalar processor multiple instructions are dispatched from the same thread.
In the outline above the processor processes parts of a single instruction at a time. Computer programs could be executed faster if multiple instructions were processed simultaneously. This is what superscalar processors achieve, by replicating functional units such as ALUs. The replication of functional units was only made possible when the ...
A scalar processor is classified as a single instruction, single data processor in Flynn's taxonomy.The Intel 486 is an example of a scalar processor. It is to be contrasted with a vector processor where a single instruction operates simultaneously on multiple data items (and thus is referred to as a single instruction, multiple data processor). [2]
It is common for modern processing units to have multiple parallel functional units within its execution units, which is referred to as superscalar design. [6] The simplest arrangement is to use a single bus manager unit to manage the memory interface and the others to perform calculations. Additionally, modern execution units are usually ...
Very long instruction word (VLIW) refers to instruction set architectures that are designed to exploit instruction-level parallelism (ILP). A VLIW processor allows programs to explicitly specify instructions to execute in parallel, whereas conventional central processing units (CPUs) mostly allow programs to specify instructions to execute in sequence only.