SIMD within a register (SWAR), also known by the name "packed SIMD"[1] is a technique for performing parallel operations on data contained in a processor register. SIMD stands for single instruction, multiple data. Flynn's 1972 taxonomy categorises SWAR as "pipelined processing".
Flynn's taxonomy
Single data stream
SISD
MISD
Multiple data streams
SIMD
MIMD
SIMD Subcategories[2]
Array processing (SIMT)
Pipelined processing (packed SIMD)
Associative processing (predicated/masked SIMD)
See also
SPMD
MPMD
Many modern general-purpose computer processors have some provisions for SIMD, in the form of a group of registers and instructions to make use of them. SWAR refers to the use of those registers and instructions, as opposed to using specialized processing engines designed to be better at SIMD operations. It also refers to the use of SIMD with general-purpose registers and instructions that were not meant to do it at the time, by way of various novel software tricks.[3]
^Miyaoka, Y.; Choi, J.; Togawa, N.; Yanagisawa, M.; Ohtsuki, T. (2002). An algorithm of hardware unit generation for processor core synthesis with packed SIMD type instructions. Asia-Pacific Conference on Circuits and Systems. Vol. 1. pp. 171–176. doi:10.1109/APCCAS.2002.1114930. hdl:2065/10689.
^Flynn, Michael J. (September 1972). "Some Computer Organizations and Their Effectiveness" (PDF). IEEE Transactions on Computers. C-21 (9): 948–960. doi:10.1109/TC.1972.5009071.
^Fisher, Randall J (2003). General-Purpose SIMD Within A Register: Parallel Processing on Consumer Microprocessors(PDF) (Ph.D.). Purdue University.
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