Wikipedia
SIMD within a register (SWAR) is a technique for performing parallel operations on data contained in a processor register. SIMD stands for ''single instruction, multiple data'
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.
Usage examples of "swar".
Almoth Plain, near the great forest called the Paerish Swar, and one in the low mountains along the north of Toman Head, facing the Aryth Ocean.