3daacdcd5f
2015-12-10 Jeff Law <law@redhat.com> PR tree-optimization/68619 * tree-ssa-dom.c (dom_opt_dom_walker::before_dom_children): Propgate return value from optimize_stmt. (dom_opt_dom_walker): Add new argument to dom_walker constructor. (pass_dominator:execute): If a block has an unreachable edge, remove all jump threads through any successor of the affected block. (record_equivalences_from_phis): Ignore alternative if the edge does not have EDGE_EXECUTABLE set. (single_incoming_edge_ignoring_loop_edges): Similarly. (optimize_stmt): If a gimple_code has a compile-time constant condition, return the edge taken for that constant value. Also change the condition to true/false as necessary. * domwalk.h (dom_walker::dom_walker): Add new argument skip_unreachable_blocks. Don't provide empty constructor body. (dom_walker::before_dom_children): Change return type. (dom_walker::bb_reachable): Declare new private method. (dom_walker::propagate_unreachable_to_edges): Likewise. (dom_walker::m_unreachable_dom): Declare new private data member. (dom_walker::m_skip_unreachable_blocks): Likewise. * domwalk.c: Include dumpfile.h. (dom_walker::dom_walker): New constructor. Initialize private data members. If needed, set EDGE_EXECUTABLE for all edges in the CFG, extracted from tree-ssa-sccvn.c. (dom_walker::bb_reachable): New method extracted from tree-ssa-sccvn.c (dom_walker::propagate_unreachable_to_edges): Likewise. (dom_walker::walk): Only call before_dom_children on reachable blocks. If before_dom_children returns an edge, then clear EDGE_EXECUTABLE for all other outgoing edges from the same block. For unreachable blocks, call propagate_unreachable_to_edges. Similarly, only call after_dom_children on reachable blocks. For unreachable blocks, conditionally clear m_unreachable_dom. * tree-ssa-sccvn.c (sccvn_dom_walker::unreachable_dom): Remove private data member. (sccvn_dom_walker::after_dom_children): Use methods from dom_walker class. (run_scc_vn): Likewise. (sccvn_dom_walker::before_dom_children): Likewise. Return the taken outgoing edge if a COND, SWITCH, or GOTO are optimized. * compare-elim.c (find_comparison_dom_walker::before_dom_children): Change return type to an edge. Always return NULL. * fwprop.c (single_def_use_dom_walker::before_dom_children): Likewise. * gimple-ssa-strength-reduction.c (find_candidates_dom_walker::before_dom_children): Likewise. * ipa-prop.c (analysis_dom_walker::before_dom_children): Likewise. (ipcp_modif_dom_walker::before_dom_children): Likewise. * tree-into-ssa.c (rewrite_dom_walker::before_dom_children): Likewise. (rewrite_update_dom_walker::before_dom_children): Likewise. (mark_def_dom_children::before_dom_children): Likewise. * tree-ssa-dse.c (dse_dom_walker::before_dom_children): Likewise. * tree-ssa-loop-im.c (invariantness_dom_walker::before_dom_children): Likewise. (move_computations_dom_walker::before_dom_walker): Likewise. * tree-ssa-phiopt.c (nontrapping_dom_walker::before_dom_children): Likewise. * tree-ssa-pre.c (eliminate_dom_walker::before_dom_children): Likewise. * tree-ssa-propagate.c (substitute_and_fold_dom_walker::before_dom_children): Likewise. * tree-ssa-strlen.c (strlen_dom_walker::before_dom_children): Likewise. * tree-ssa-uncprop.c (uncprop_dom_walker::before_dom_children): Likewise. PR tree-optimization/68619 * gcc.dg/tree-ssa/pr68619-1.c: New test. * gcc.dg/tree-ssa/pr68619-2.c: New test. * gcc.dg/tree-ssa/pr68619-3.c: New test. * gcc.dg/tree-ssa/pr68619-4.c: New test. * gcc.dg/tree-ssa/pr68619-5.c: New test. From-SVN: r231527 |
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