Lowest common denominator (computers) | Wikipedia audio article
Channel: Subhajit Sahu
Date: 2019-01-18

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Instruction_selection


00:01:25 Macro expansion
00:03:03 Graph covering
00:04:10 Lowest common denominator strategy



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- Socrates


SUMMARY
=======
In computer science, instruction selection is the stage of a compiler backend that transforms its middle-level intermediate representation (IR) into a low-level IR where each operation directly corresponds to an instruction available on the target machine. In a typical compiler, instruction selection precedes both instruction scheduling and register allocation; hence its output IR has an infinite set of pseudo-registers (often known as temporaries) and may still be – and typically is – subject to peephole optimization. Otherwise, it closely resembles the target machine code, bytecode, or assembly language.

For example, for the following sequence of middle-level IR codet1 = a
t2 = b
t3 = t1 + t2
a = t3
b = t1

a good instruction sequence for the x86 architecture is

For a comprehensive survey on instruction selection, see.