The x86 instruction set includes string load, store, move, scan and compare instructions ( lods, stos, movs, scas and cmps ) which perform each operation to a specified size ( b for 8-bit byte, w for 16-bit word, d for 32-bit double word ) then increments / decrements ( depending on DF, direction flag ) the implicit address register ( si for lods, di for stos and scas, and both for movs and cmps ).
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