Discussion
Instruction selection is the task of
Answer: C
Correct answer: choosing target instructions that implement the intermediate operations
Instruction selection maps each intermediate operation, or a pattern of several, onto the machine instructions that realise it - often with several valid choices differing in cost.
A three-address addition might become an add, a load-effective-address, or an increment, according to the operands and the addressing modes available. Because the choice depends entirely on the target's instruction set, it is a back-end task and one of the parts that must be rewritten when a compiler is retargeted.
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