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For the testcase in PR114855 at -O1 add_store_equivs shows up as the main sink for bitmap_set_bit because it uses a bitmap to mark all seen insns by UID to make sure the forward walk in memref_used_between_p will find the insn in question. Given we do have a CFG here the functions operation is questionable, given memref_used_between_p together with the walk of all insns is obviously quadratic in the worst case that whole thing should be re-done ... but, for the testcase, using a sbitmap of size get_max_uid () + 1 gets bitmap_set_bit off the profile and improves IRA time from 15.58s (8%) to 3.46s (2%). Now, given above quadraticness I wonder whether we should instead gate add_store_equivs on optimize > 1 or flag_expensive_optimizations. PR rtl-optimization/114855 * ira.cc (add_store_equivs): Use sbitmap for tracking visited insns.
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