In computer science, instruction selection is the stage of a compiler backend that transforms its tree-based middle-level intermediate representation (IR) into a low-level IR very close to its final target language. In a typical compiler, it precedes both instruction scheduling and register allocation, so its output IR has an infinite set of pseudoregisters and may still be subject to peephole optimization; otherwise, it closely resembles the target machine code, bytecode, or assembly language. It works by "covering" the intermediate representation with as few tiles as possible. A tile is a template that matches a portion of the IR tree and can be implemented with a single target instruction.
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Famous quotes containing the words instruction and/or selection:
“A little instruction in the elements of chartography—a little practice in the use of the compass and the spirit level, a topographical map of the town common, an excursion with a road map—would have given me a fat round earth in place of my paper ghost.”
—Mary Antin (1881–1949)
“Judge Ginsburg’s selection should be a model—chosen on merit and not ideology, despite some naysaying, with little advance publicity. Her treatment could begin to overturn a terrible precedent: that is, that the most terrifying sentence among the accomplished in America has become, “Honey—the White House is on the phone.””
—Anna Quindlen (b. 1952)