Discussion
Global value numbering differs from local value numbering in that it
Answer: A
Correct answer: works across the whole procedure rather than one block
Local value numbering assigns a number to each distinct computed value within a block and reuses it where the same value recurs. The global version extends this across the whole procedure, which requires reasoning about values flowing along different control paths - commonly done over static single assignment form, though that is a convenience rather than a requirement.
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