perf: hoist loop variable in minimizer to improve performance#172
perf: hoist loop variable in minimizer to improve performance#172Tugamer89 wants to merge 1 commit into
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Hoisted the `transitions == null` check out of the loop over `alphabetArray` in `Minimizer.java` by using `Arrays.fill(targets, -1)` when `transitions == null`. This micro-optimization prevents repeated null checks inside the loop and improves execution speed when building minimal DFA. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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What:
Hoisted a loop-invariant condition (
transitions == null) out of an internal loop iterating over thealphabetArraywithin thesplitGroupmethod ofMinimizer.java. Whentransitionsis null, the target array is populated directly usingArrays.fill(targets, -1), bypassing the iteration entirely.Why:
To eliminate repeated and redundant null checks inside a hot loop during the minimization phase of DFA processing.
Impact:
Improves execution speed of the
splitGroupprocessing algorithm and decreases the time taken to iterate. Although a micro-optimization, it provides a localized performance boost during the creation of minimal DFAs with no regressions.Measurement:
Run
mvn test -Dmaven.compiler.source=21 -Dmaven.compiler.target=21 -Dmaven.compiler.release=21to verify that all functional correctness remains intact. Profile execution of DFA minimization over a large number of states to observe the time delta in thesplitGroupoperations.PR created automatically by Jules for task 8056675081996951829 started by @Tugamer89