Instruction set architecture: Difference between revisions

Revision as of 12:39, 23 September 2024

Revision as of 20:22, 9 November 2024

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====Data handling and memory operations====

*''Set'' a [[processor register|register]] to a fixed constant value.

*''Copy'' data from a memory ___location or a register to a memory ___location or a register (a machine instruction is often called ''move''; however, the term is misleading). They are used to store the contents of a register, the contents of another memory ___location or the result of a computation, or to retrieve stored data to perform a computation on it later. They are often called [[load–store unit|''load'' andor ''store'']] operations.

*''Read'' andor ''write'' data from hardware devices.

====Arithmetic and logic operations====

*''Add'', ''subtract'', ''multiply'', or ''divide'' the values of two registers, placing the result in a register, possibly setting one or more [[flag (computingprogramming)|condition codes]] in a [[status register]].{{Sfn|Hennessy|Patterson|2003|p=108}}

**''{{vanchor|increment}}'', ''{{vanchor|decrement}}'' in some ISAs, saving operand fetch in trivial cases.

*Perform [[bitwise operation]]s, e.g., taking the ''[[logical conjunction|conjunction]]'' and ''[[logical disjunction|disjunction]]'' of corresponding bits in a pair of registers, taking the ''[[logical negation|negation]]'' of each bit in a register.