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나머지

ARM의 Thumb Mode

by 무늬만학생 2012. 1. 19.
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Many of the complex functions performed in a single, albeit slow, instruction in a CISC processor may require two, three, or more simpler instructions in a RISC.
Except in the most speed-critical of embedded devices, the cost of memory is much more critical than the execution speed of the processor. To reduce memory requirements and, thereby, cost, Advanced RISC Machines (ARM) created the Thumb instruction set as an option for their RISC processor cores.



Based upon the available instruction set, any code written in C could be executed successfully in Thumb state. However, device drivers and exception handlers must often be written at least partly in ARM state. 
 
http://skyul.tistory.com/54

http://eetimes.com/discussion/other/4024632/Introduction-to-ARM-thumb 

 
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