Opcode: Difference between revisions

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Depending on architecture, the ''operands'' may be [[processor register|register]] values, values in the [[call stack|stack]], other [[memory]] values, [[I/O]] ports, etc., specified and accessed using more or less complex [[addressing mode]]s. The types of ''operations'' include [[arithmetic]]s, data copying, [[logical operation]]s, and program control, as well as special instructions (such as [[CPUID]] and others).
 
[[Assembly language]], or just ''assembly'', is a [[low-level programming language]], which uses [[Assembly language#Opcode mnemonics and extended mnemonics|mnemonic]]s, instructions and operands to represent [[machine code]]. This enhances the readability while still giving precise control over the machine instructions. Most programming is currently done using [[high-level programming language]]s,<ref name="tiobe">[http://www.tiobe.com/index.php/content/paperinfo/tpci/index.html TIOBE Software Popularity Index]</ref><ref name=langpop>http://langpop.com/</ref> which are typically easier to read and write. These languages need to be compiled (translated into assembly language), or run through other compiled programs.<ref name="asm">[http://www.swansontec.com/sprogram.htm Introduction to Assembly Language]</ref>
 
=={{Anchor|SIS}}Software instruction sets==