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Thumb instruction set – v5 – 1 r all 'Thumb-aware' cores also support the ARM instruction set r most Thumb instructions use a 2-address format. ARM: a 32-bit constant, formed by right-rotating an 8-bit value by an even number of bits. SPm. SP for the processor mode specified by . Thumb: a ARM and Thumb are two different instruction sets supported by ARM cores Thumb mode allows for code to be smaller, and can potentially be faster if the targetThe Thumb instruction set is a subset of the most commonly used 32-bit ARM instructions. Thumb instructions are each 16 bits long, and have a corresponding The THUMB instruction set formats are shown in the following figure. All instructions in this format have an equivalent ARM instruction as shown in · The Thumb instruction set consists of 16-bit instructions that act as a compact shorthand for a subset of the 32-bit instructions of the standard ARM. Every Quick Reference Card for the ARM and Thumb-2 Instruction Set. Instruction Set Quick Reference Card. This document is only available in a PDF version.