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2005 PEVEIT Unit – ARM System Design. Thumb instruction set – v5 – 1. MANCHEstER. 1824. The University of Manchester. The Thumb instruction set t Outline 22 Aug 2008 Subset of the functionality of the ARM instruction set. ? Core has two execution states – ARM and Thumb. – Switch between them using BX The Thumb instruction set. The 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 32-bit ARM instruction that has the same effect on the processor model. This card lists all Thumb instructions available on Thumb-capable processors earlier than ARM®v6T2. In addition, it lists all Thumb-2 16-bit instructions. For example, code running in SVC mode can be either ARM or Thumb. The main difference between these two states is the instruction set, where instructions in24 Sep 2003 To reduce memory requirements and, thereby, cost, Advanced RISC Machines (ARM) created the Thumb instruction set as an option for their 1 Jul 2016 under "The Thumb instruction set" in section 1-34 of "ARM11TechnicalRefManual" it said that: "The Thumb instruction set is a subset of the most commonly used 32-bit ARM instructions.Thumb instructions are 16 bits long,and have a corresponding 32-bit ARM instruction that has the same effect on processor model." A stated aim for Thumb-2 was to achieve code density similar to Thumb with performance similar to the ARM instruction set on 32-bit ARM DDI 0029E. 5-1. 11. 1. Open Access. THUMB Instruction Set. This chapter describes the THUMB instruction set. Format Summary. 5-2. Opcode Summary. Some instructions use the least significant bit of the address to determine whether the code being branched to is Thumb code or ARM code. Before the introduction of 32-bit Thumb instructions, the Thumb instruction set was limited to a restricted subset of the functionality of the ARM instruction set.