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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]
In computing, a vector processor or array processor is a central processing unit (CPU) that implements an instruction set where its instructions are designed to operate efficiently and effectively on large one-dimensional arrays of data called vectors.
Multiple autonomous processors simultaneously executing the same program (but at independent points, rather than in the lockstep that SIMD imposes) on different data. [19] Also termed single process, multiple data [ 17 ] - the use of this terminology for SPMD is technically incorrect, as SPMD is a parallel execution model and assumes multiple ...
Here, c[i:i+3] represents the four array elements from c[i] to c[i+3] and the vector processor can perform four operations for a single vector instruction. Since the four vector operations complete in roughly the same time as one scalar instruction, the vector approach can run up to four times faster than the original code.
7-stage integer, 6-stage vector Multi-core, multithreading, 4 hardware-based simultaneous threads per core which can't be disabled unlike regular HyperThreading , Time-multiplexed multithreading, 61 cores per chip, 244 threads per chip, 30.5 MB L2 cache , 300 W TDP, Turbo Boost , in-order dual-issue pipelines, coprocessor , Floating-point ...
Vector processors, some SIMD ISAs (such as AVX2 and AVX-512) and GPUs in general make heavy use of predication, applying one bit of a conditional mask vector to the corresponding elements in the vector registers being processed, whereas scalar predication in scalar instruction sets only need the one predicate bit.
A superscalar processor (or multiple-issue processor [1]) is a CPU that implements a form of parallelism called instruction-level parallelism within a single processor. [2] In contrast to a scalar processor, which can execute at most one single instruction per clock cycle, a superscalar processor can execute or start executing more than one ...
A later processor that used vector processing is the Cell Processor used in the Playstation 3, which was developed by IBM in cooperation with Toshiba and Sony. It uses a number of SIMD processors (a NUMA architecture, each with independent local store and controlled by a general purpose CPU) and is geared towards the huge datasets required by ...