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Modern Compiler Implementation in C by Maia Ginsburg, Andrew W. Appel

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Instruction Selection

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in-struc-tion: a code that tells a computer to perform a particular operation

Webster’s Dictionary

The intermediate representation (Tree) language expresses only one operation in each tree node: memory fetch or store, addition or subtraction, conditional jump, and so on. A real machine instruction can often perform several of these primitive operations. For example, almost any machine can perform an add and a fetch in the same instruction, corresponding to the tree

Finding the appropriate machine instructions to implement ...

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