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Thumb-2 technology

Thumb-2 technology is available in the ARMv6T2 and later architectures. Thumb-2 technology is a major 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. The additional 32-bit Thumb instructions enable Thumb to cover most of the functionality of the ARM instruction set. The availability of 16-bit and 32-bit instructions enable Thumb-2 technology to combine the code density of earlier versions of Thumb with the performance of the ARM instruction set.

An important difference between the 32-bit Thumb instruction set and the ARM instruction set is that most 32-bit Thumb instructions are unconditional, whereas most ARM instructions can be conditional. The Thumb-2 technology introduces a conditional execution instruction, IT, that is a logical if-then-else operation that you can apply to subsequent instructions to make them conditional.

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