Difference between thumb and thumb2 instruction set

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The Cortex-M3 offers many new features including Thumb-2 Instruction Set and very low power consumption, low interrupt latency etc. I will cover those in future. The LPC1768 is microcontroller belongs to Cortex-M3 core. Overall, the most noticeable difference between M3 and M4 is the optional single-precision (IEEE-754) Floating Point Unit Thumb-ARM differences: • most Thumb instructions are unconditional - all ARM instructions are conditional • most Thumb instructions use a 2-address format - most ARM instructions use a 3-address format • Thumb instruction formats are less regular - a result of the denser encoding • Thumb has explicit shift opcodes Types of ARM Instruction Set. ARM architecture supports Thumb 16-bit and Thumb-2 32-bit instruction sets. Most of the ARM instructions use three operands. These instructions are classified based on their instructions format and operations which are listed as follows: i. Data processing 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 in ARM state are always 32-bit, and instructions in Thumb state are 16-bit (but can be 32-bit). Thumb-2 (16-bit and 32-bit instructions): extents Thumb-1 by adding more instructions and Answer (1 of 4): The ARM Thumb instruction set was created to increase performance, and reduce the size of compiled programs, to make ARM processors more competitive with other architectures, particularly for microcontroller applications where program space is critical.. Because the original ARM The most important difference between the Thumb ISA and the ARM ISA is that most 32-bit Thumb instructions are unconditional, whereas almost all ARM instructions can be conditional. However, Thumb-2 introduces a new If-Then ( IT) instruction that delivers much of the functionality of the condition field in ARM instructions. Thumb-ARM differences: most Thumb instructions are unconditional - all ARM instructions are conditional ARM System Design Thumb instruction set - v5 - 26 MANCHEstER 1824 The University of Manchester Thumb - ARM instruction mapping 001 imm8 15 012 11 10 op Rd/Rn 87 111 31 1628 27 26 2425 • Thumb-2 introduces 32-bit instructions that are intermixed with the 16-bit instructions. • 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 set. Any code that you have compiled to run on the ARMv6 thumb instruction set runs on the Thumb-2 ARM® and Thumb®-2 Instruction Set Quick Reference Card [ 16/65] ARM Fix undefined instruction exception handling What are advantages and disadvantages of Thumb instruction Thumb humb InstructionInstructionss cgu.edu.tw Resolving compilation issues in WEC2013 porting ' Part1 Difference between ARM instruction setThumb and Thumb-2 thumb instructions were introduced with armv4t which is the arm7tdmi basically, also arm is supported in this core. armv5t also supported the thumb i