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During reverse-RPO natural loop discovery in WeakTopologicalOrdering, collapse each discovered loop body into its header using union-find with path compression, and skip over already-collapsed inner loops when walking immediate dominators in dominates(). This prevents outer loops from re-traversing inner loop bodies, bounding natural loop discovery to O(E alpha(N)) instead of O(N * depth) on deeply nested loops. Benchmark results across 16 WebAssembly modules (3 iterations, interleaved): - --constraint-analysis: - Geomean: 1.576s -> 1.564s (-0.7%) - Total time: 62.82s -> 62.40s (-0.7%) - --rse: - Geomean: 0.859s -> 0.853s (-0.7%) - Total time: 25.40s -> 25.06s (-1.3%)
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During reverse-RPO natural loop discovery in WeakTopologicalOrdering,
collapse each discovered loop body into its header using union-find with
path compression, and skip over already-collapsed inner loops when
walking immediate dominators in dominates(). This prevents outer loops
from re-traversing inner loop bodies, bounding natural loop discovery to
O(E alpha(N)) instead of O(N * depth) on deeply nested loops.
Benchmark results across 16 WebAssembly modules (3 iterations,
interleaved):