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The following introduces LOOP_VINFO_MAIN_LOOP_INFO alongside LOOP_VINFO_ORIG_LOOP_INFO so one can have both access to the main vectorized loop info and the preceeding vectorized epilogue. This is critical for correctness as we need to disallow never executed epilogues by costing in vect_analyze_loop_costing as we assume those do not exist when deciding to add a skip-vector edge during peeling. The patch also changes how multiple vector epilogues are handled - instead of the epilogue_vinfos array in the main loop info we now record the single epilogue_vinfo there and further epilogues in the epilogue_vinfo member of the epilogue info. This simplifies code. * tree-vectorizer.h (_loop_vec_info::main_loop_info): New. (LOOP_VINFO_MAIN_LOOP_INFO): Likewise. (_loop_vec_info::epilogue_vinfo): Change from epilogue_vinfos from array to single element. * tree-vect-loop.cc (_loop_vec_info::_loop_vec_info): Initialize main_loop_info and epilogue_vinfo. Remove epilogue_vinfos allocation. (_loop_vec_info::~_loop_vec_info): Do not release epilogue_vinfos. (vect_create_loop_vinfo): Rename parameter, set LOOP_VINFO_MAIN_LOOP_INFO. (vect_analyze_loop_1): Rename parameter. (vect_analyze_loop_costing): Properly distinguish between the main vector loop and the preceeding epilogue. (vect_analyze_loop): Change for epilogue_vinfos no longer being a vector. * tree-vect-loop-manip.cc (vect_do_peeling): Simplify and thereby handle a vector epilogue of a vector epilogue. |
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