cf5b92ef1e
PR tree-optimization/52272 * tree-ssa-loop-ivopts.c (struct iv_common_cand): New struct. (struct iv_common_cand_hasher): New struct. (iv_common_cand_hasher::hash): New function. (iv_common_cand_hasher::equal): New function. (struct ivopts_data): New fields, iv_common_cand_tab and iv_common_cands. (tree_ssa_iv_optimize_init): Initialize above fields. (record_common_cand, common_cand_cmp): New functions. (add_iv_candidate_derived_from_uses): New function. (add_iv_candidate_for_use): Record iv_common_cands derived from iv use in hash table, instead of adding candidates directly. (add_iv_candidate_for_uses): Call add_iv_candidate_derived_from_uses. (record_important_candidates): Add important candidates to iv uses' related_cands. Always keep related_cands for future use. (try_add_cand_for): Use iv uses' related_cands. (free_loop_data, tree_ssa_iv_optimize_finalize): Release new fields in struct ivopts_data, iv_common_cand_tab and iv_common_cands. From-SVN: r230647
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