翻訳と辞書
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・ Instruction creep
・ Instruction cycle
・ Instruction in Latin
・ Instruction list
・ Instruction of Amenemope
・ Instruction of Ankhsheshonq
・ Instruction of Any
・ Instruction of Hardjedef
・ Instruction on transliteration of Belarusian geographical names with letters of Latin script
・ Instruction path length
・ Instruction pipelining
・ Instruction prefetch
・ Instruction register
・ Instruction scheduling
・ Instruction selection
Instruction set
・ Instruction set simulator
・ Instruction step
・ Instruction unit
・ Instruction window
・ Instruction-level parallelism
・ Instructional animation
・ Instructional capital
・ Instructional design
・ Instructional design coordinator
・ Instructional leadership
・ Instructional manipulation check
・ Instructional modeling
・ Instructional rounds
・ Instructional scaffolding


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Instruction set : ウィキペディア英語版
Instruction set

An instruction set, or instruction set architecture (ISA), is the part of the computer architecture related to programming, including the native data types, instructions, registers, addressing modes, memory architecture, interrupt and exception handling, and external I/O. An ISA includes a specification of the set of opcodes (machine language), and the native commands implemented by a particular processor.
==Overview==
Instruction set architecture is distinguished from the microarchitecture, which is the set of processor design techniques used to implement the instruction set. Computers with different microarchitectures can share a common instruction set. For example, the Intel Pentium and the AMD Athlon implement nearly identical versions of the x86 instruction set, but have radically different internal designs.
The concept of an ''architecture'', distinct from the design of a specific machine, was developed by Fred Brooks at IBM during the design phase of System/360.
Some virtual machines that support bytecode as their ISA such as Smalltalk, the Java virtual machine, and Microsoft's Common Language Runtime, implement this by translating the bytecode for commonly used code paths into native machine code. In addition, these virtual machines execute less frequently used code paths by interpretation (see: Just-in-time compilation). Transmeta implemented the x86 instruction set atop VLIW processors in this fashion.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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