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The Thumb-2 instruction set covers almost all the functionality of the ARM instruction set. Thumb-2 is backwards compatible with the ARMv6 Thumb instruction Instead of using ARM instructions for some operations, as in traditional ARM processors, it uses the Thumb-2 instruction set for all operations. I am working on an ARM Cortex-M3 controller which has the Thumb-2 instruction set. Thumb mode is used to compress the instruction to a 16-bit size.ARM and Thumb-2 Instruction Set. Quick Reference Card. Operation. §. Assembler. S updates. Action. Notes. Multiply. Multiply. MUL{S} Rd, Rm, Rs. ARM Architecture Reference Manual, Thumb-2® Supplement (ARM DDI 0308) This chapter introduces the processor and instruction set.