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SIMD - Single Instruction Multiple Data
By:Christine Martz
A single computer instruction that can perform an identical action, simultaneously, on multiple processors. SIMD allows a group of simple processors to all perform the same task at the same time, each with different data. Low level imaging maps well to SIMD because images consist of rectangular grids of pixels that are all processed the same way. SIMD extensions are used to greatly accelerate performance of 3D graphics. SIMD is used by Pentium III PROCESSORS geared to 3D graphics and multimedia. The first use of SIMD instructions was in vector supercomputers and was especially popularized by Cray in the 1970s.

Other Related Definitions for SIMD
"An instruction set for a computer where a single instruction acts on multiple data in parallel. Examples include Intel's MMX and Streaming SIMD, and Sun's VIS instruction set. SIMD is used in image and video processing where a single instruction acts on several pixels or transform coefficients in parallel." [jmcgowan]

"A type of CPU design that allows a single instruction to work with multiple pieces of data at once, so they can do several things at once. Each path through an instruction is called a vector. Thus, these are sometimes called Vector Processors. Intel's Pentium III includes SIMD capabilities." [scotsmist]

"A parallel processor where many processing elements (functional units) perform the same operations on different data. Often a central controller broadcasts the instruction stream to all the processing elements." [xlinx]
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