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For the testcase in PR114855 VRP takes 320.41s (23%) (after mitigating backwards threader slowness). This is mostly due to the bitmap check in equiv_oracle::find_equiv_dom. The following turns this bitmap to tree view, trading the linear search for a O(log N) one which improves VRP time to 54.54s (5%). PR tree-optimization/114855 * value-relation.cc (equiv_oracle::equiv_oracle): Switch m_equiv_set to tree view.
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