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・ Orthognathic surgery
・ Orthogonal (novel)
・ Orthogonal array
・ Orthogonal array testing
・ Orthogonal basis
・ Orthogonal collocation
・ Orthogonal complement
・ Orthogonal convex hull
・ Orthogonal coordinates
・ Orthogonal Defect Classification
・ Orthogonal diagonalization
・ Orthogonal frequency-division multiple access
・ Orthogonal frequency-division multiplexing
・ Orthogonal functions
・ Orthogonal group
Orthogonal instruction set
・ Orthogonal matrix
・ Orthogonal polarization spectral imaging
・ Orthogonal polynomials
・ Orthogonal polynomials on the unit circle
・ Orthogonal Procrustes problem
・ Orthogonal symmetric Lie algebra
・ Orthogonal trajectory
・ Orthogonal transformation
・ Orthogonal wavelet
・ Orthogonality
・ Orthogonality (programming)
・ Orthogonality (term rewriting)
・ Orthogonality principle
・ Orthogonalization


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Orthogonal instruction set : ウィキペディア英語版
Orthogonal instruction set

In computer engineering, an orthogonal instruction set is an instruction set architecture where all instruction types can use all addressing modes. It is "orthogonal" in the sense that the instruction type and the addressing mode vary independently. An orthogonal instruction set does not impose a limitation that requires a certain instruction to use a specific register.
==Orthogonality in practice==
In many CISC computers, an instruction could access either registers or memory, usually in several different ways. This made the CISC machines easier to program, because rather than being required to remember thousands of individual instruction opcodes, an orthogonal instruction set allowed a programmer to instead remember just thirty to a hundred operation codes ("ADD", "SUBTRACT", "MULTIPLY", "DIVIDE", etc.) and a set of three to ten addressing modes ("FROM REGISTER 0", "FROM REGISTER 1", "FROM MEMORY", etc.). The DEC PDP-11 and Motorola 68000 computer architectures are examples of nearly orthogonal instruction sets, while the ARM11 and VAX are examples of CPUs with fully orthogonal instruction sets.

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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