Discussion
Peephole optimization is form of
Answer: B
Peephole optimization is a form of local optimization.
It examines a small sliding window of consecutive instructions, the 'peephole', and replaces patterns with shorter or faster equivalents: removing redundant loads and stores, unreachable code or jumps to jumps, and simplifying algebra. It looks only at a small local region.
Loop optimization works on whole loops, dataflow analysis on the whole procedure, and constant folding is one particular transformation that peephole optimization may perform, not the category it belongs to.
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