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The functionality of the Thumb instruction set is a subset of the functionality of the 32-bit ARM instruction set. A processor that is executing Thumb The ARM Thumb instruction set was created to increase performance, and reduce the size of compiled programs, to make ARM processors more competitive withThe Thumb instruction set provides most of the functionality required in a typical application. Arithmetic and logical operations, load/store data movements, For example, THUMB instruction set has shorter immediate and offset field comparing to ARM instruction set. It also sacrifices several features that ARM Thumb-2 is an enhancement to the 16-bit Thumb instruction set. It adds 32-bit instructions that can be freely intermixed with 16-bit instructions in a program. What is Thumb? t Thumb is: r a compressed, 16-bit representation of a subset of the ARM instruction set.