翻訳と辞書
Words near each other
・ thread language zero
・ thread-safe
・ threaded
・ threaded code
・ threading
・ three-finger salute
・ three-letter acronym
・ three-tier
・ throughput
・ thud
thumb
・ thumbnail
・ thunderbird
・ thunk
・ tia
・ tick
・ tick-list features
・ tickit
・ tickle
・ tickle a bug


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thumb : FOLDOC
Thumb
An extension to the Advanced RISC Machine architecture, announced on 06 March 1995 by Advanced RISC Machines Ltd. By identifying the critical subset of the ARM instruction set and encoding it into 16 bits, ARM has succeeded in reducing typical program size by 30-40% from ARM's already excellent code density. Since this Thumb instruction set uses less memory for program storage, cost is further reduced.
All Thumb-aware {processor cores} combine the capability to execute both the 32-bit ARM and the 16-bit Thumb instruction sets. Careful design of the Thumb instructions allow them to be decompressed into full ARM instructions transparently during normal instruction decoding without any performance penalty. This differs from other 32-bit processors, like the Intel 486SX, with a 16-bit data bus, which require two 16-bit memory accesses to execute every 32-bit instruction and so halve performance.
The patented Thumb decompressor has been carefully designed with only a


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