Discussion
Consider the following statements about code generation.
1. Instruction selection depends on the target instruction set.
2. Register allocation depends on the number of machine registers.
3. Both are independent of the source language being compiled.
Answer: C
All three hold. The back end sees only the intermediate representation and the machine description, which is precisely what allows one back end to serve several source languages. The machine description is the only thing that changes between targets.
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