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* tree-loop-distribution.c: Adjust the general comment. (NUM_PARTITION_THRESHOLD): New macro. (ssa_name_has_uses_outside_loop_p): Support loop nest distribution. (classify_partition): Skip builtin pattern of loop nest's inner loop. (merge_dep_scc_partitions): New parameter ignore_alias_p and use it in call to build_partition_graph. (finalize_partitions): New parameter. Make loop distribution more conservative by fusing more partitions. (distribute_loop): Don't do runtime alias check in case of loop nest distribution. (find_seed_stmts_for_distribution): New function. (prepare_perfect_loop_nest): New function. (pass_loop_distribution::execute): Refactor code finding seed stmts and loop nest into above functions. Support loop nest distribution. Adjust dump information accordingly. gcc/testsuite * gcc.dg/tree-ssa/ldist-7.c: Adjust test string. * gcc.dg/tree-ssa/ldist-16.c: Ditto. * gcc.dg/tree-ssa/ldist-25.c: Ditto. * gcc.dg/tree-ssa/ldist-33.c: New test. From-SVN: r253679
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