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2017-10-13 Richard Biener <rguenther@suse.de> PR tree-optimization/82451 Revert 2017-10-02 Richard Biener <rguenther@suse.de> PR tree-optimization/82355 * graphite-isl-ast-to-gimple.c (build_iv_mapping): Also build a mapping for the enclosing loop but avoid generating one for the loop tree root. (copy_bb_and_scalar_dependences): Remove premature codegen error on PHIs in blocks duplicated into multiple places. * graphite-scop-detection.c (scop_detection::stmt_has_simple_data_refs_p): For a loop not in the region use it as loop and nest to analyze the DR in. (try_generate_gimple_bb): Likewise. * graphite-sese-to-poly.c (extract_affine_chrec): Adjust. (add_loop_constraints): For blocks in a loop not in the region create a dimension with a single iteration. * sese.h (gbb_loop_at_index): Remove assert. * cfgloop.c (loop_preheader_edge): For the loop tree root return the single successor of the entry block. * graphite-isl-ast-to-gimple.c (graphite_regenerate_ast_isl): Reset the SCEV hashtable and niters. * graphite-scop-detection.c (scop_detection::graphite_can_represent_scev): Add SCOP parameter, assert that we only have POLYNOMIAL_CHREC that vary in loops contained in the region. (scop_detection::graphite_can_represent_expr): Adjust. (scop_detection::stmt_has_simple_data_refs_p): For loops not in the region set loop to NULL. The nest is now the entry edge to the region. (try_generate_gimple_bb): Likewise. * sese.c (scalar_evolution_in_region): Adjust for instantiate_scev change. * tree-data-ref.h (graphite_find_data_references_in_stmt): Make nest parameter the edge into the region. (create_data_ref): Likewise. * tree-data-ref.c (dr_analyze_indices): Make nest parameter an entry edge into a region and adjust instantiate_scev calls. (create_data_ref): Likewise. (graphite_find_data_references_in_stmt): Likewise. (find_data_references_in_stmt): Pass the loop preheader edge from the nest argument. * tree-scalar-evolution.h (instantiate_scev): Make instantiate_below parameter the edge into the region. (instantiate_parameters): Use the loop preheader edge as entry. * tree-scalar-evolution.c (analyze_scalar_evolution): Handle NULL loop. (get_instantiated_value_entry): Make instantiate_below parameter the edge into the region. (instantiate_scev_name): Likewise. Adjust dominance checks, when we cannot use loop-based instantiation instantiate by walking use-def chains. (instantiate_scev_poly): Adjust. (instantiate_scev_binary): Likewise. (instantiate_scev_convert): Likewise. (instantiate_scev_not): Likewise. (instantiate_array_ref): Remove. (instantiate_scev_3): Likewise. (instantiate_scev_2): Likewise. (instantiate_scev_1): Likewise. (instantiate_scev_r): Do not blindly handle N-operand trees. Do not instantiate array-refs. Handle all constants and invariants. (instantiate_scev): Make instantiate_below parameter the edge into the region. (resolve_mixers): Use the loop preheader edge for the region parameter to instantiate_scev_r. * tree-ssa-loop-prefetch.c (determine_loop_nest_reuse): Adjust. * gcc.dg/graphite/pr82451.c: New testcase. * gfortran.dg/graphite/id-27.f90: Likewise. * gfortran.dg/graphite/pr82451.f: Likewise. From-SVN: r253707
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