cfganal.c (single_pred_edge_ignoring_loop_edges): New function extracted from tree-ssa-dom.c.
* cfganal.c (single_pred_edge_ignoring_loop_edges): New function extracted from tree-ssa-dom.c. * cfganal.h (single_pred_edge_ignoring_loop_edges): Prototype. * tree-ssa-dom.c (single_incoming_edge_ignoring_loop_edges): Remove. (record_equivalences_from_incoming_edge): Add additional argument to single_pred_edge_ignoring_loop_edges call. * tree-ssa-uncprop.c (single_incoming_edge_ignoring_loop_edges): Remove. (uncprop_dom_walker::before_dom_children): Add additional argument to single_pred_edge_ignoring_loop_edges call. * tree-ssa-sccvn.c (sccvn_dom_walker::before_dom_children): Use single_pred_edge_ignoring_loop_edges rather than open coding. * tree-vrp.c (evrp_dom_walker::before_dom_children): Similarly. From-SVN: r254383
This commit is contained in:
parent
6362654793
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2965f1274c
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@ -1,3 +1,18 @@
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2017-11-03 Jeff Law <law@redhat.com>
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* cfganal.c (single_pred_edge_ignoring_loop_edges): New function
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extracted from tree-ssa-dom.c.
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* cfganal.h (single_pred_edge_ignoring_loop_edges): Prototype.
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* tree-ssa-dom.c (single_incoming_edge_ignoring_loop_edges): Remove.
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(record_equivalences_from_incoming_edge): Add additional argument
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to single_pred_edge_ignoring_loop_edges call.
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* tree-ssa-uncprop.c (single_incoming_edge_ignoring_loop_edges): Remove.
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(uncprop_dom_walker::before_dom_children): Add additional argument
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to single_pred_edge_ignoring_loop_edges call.
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* tree-ssa-sccvn.c (sccvn_dom_walker::before_dom_children): Use
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single_pred_edge_ignoring_loop_edges rather than open coding.
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* tree-vrp.c (evrp_dom_walker::before_dom_children): Similarly.
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2017-11-03 Marc Glisse <marc.glisse@inria.fr>
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* match.pd (-(-A)): Rewrite.
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@ -1554,3 +1554,42 @@ single_pred_before_succ_order (void)
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#undef MARK_VISITED
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#undef VISITED_P
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}
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/* Ignoring loop backedges, if BB has precisely one incoming edge then
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return that edge. Otherwise return NULL.
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When IGNORE_NOT_EXECUTABLE is true, also ignore edges that are not marked
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as executable. */
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edge
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single_pred_edge_ignoring_loop_edges (basic_block bb,
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bool ignore_not_executable)
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{
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edge retval = NULL;
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edge e;
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edge_iterator ei;
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FOR_EACH_EDGE (e, ei, bb->preds)
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{
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/* A loop back edge can be identified by the destination of
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the edge dominating the source of the edge. */
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if (dominated_by_p (CDI_DOMINATORS, e->src, e->dest))
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continue;
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/* We can safely ignore edges that are not executable. */
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if (ignore_not_executable
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&& (e->flags & EDGE_EXECUTABLE) == 0)
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continue;
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/* If we have already seen a non-loop edge, then we must have
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multiple incoming non-loop edges and thus we return NULL. */
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if (retval)
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return NULL;
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/* This is the first non-loop incoming edge we have found. Record
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it. */
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retval = e;
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}
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return retval;
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}
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@ -77,5 +77,8 @@ extern void bitmap_intersection_of_preds (sbitmap, sbitmap *, basic_block);
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extern void bitmap_union_of_succs (sbitmap, sbitmap *, basic_block);
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extern void bitmap_union_of_preds (sbitmap, sbitmap *, basic_block);
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extern basic_block * single_pred_before_succ_order (void);
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extern edge single_incoming_edge_ignoring_loop_edges (basic_block, bool);
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extern edge single_pred_edge_ignoring_loop_edges (basic_block, bool);
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#endif /* GCC_CFGANAL_H */
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@ -113,7 +113,6 @@ static void eliminate_redundant_computations (gimple_stmt_iterator *,
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class avail_exprs_stack *);
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static void record_equivalences_from_stmt (gimple *, int,
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class avail_exprs_stack *);
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static edge single_incoming_edge_ignoring_loop_edges (basic_block);
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static void dump_dominator_optimization_stats (FILE *file,
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hash_table<expr_elt_hasher> *);
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@ -1057,39 +1056,6 @@ record_equivalences_from_phis (basic_block bb)
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}
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}
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/* Ignoring loop backedges, if BB has precisely one incoming edge then
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return that edge. Otherwise return NULL. */
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static edge
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single_incoming_edge_ignoring_loop_edges (basic_block bb)
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{
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edge retval = NULL;
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edge e;
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edge_iterator ei;
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FOR_EACH_EDGE (e, ei, bb->preds)
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{
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/* A loop back edge can be identified by the destination of
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the edge dominating the source of the edge. */
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if (dominated_by_p (CDI_DOMINATORS, e->src, e->dest))
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continue;
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/* We can safely ignore edges that are not executable. */
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if ((e->flags & EDGE_EXECUTABLE) == 0)
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continue;
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/* If we have already seen a non-loop edge, then we must have
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multiple incoming non-loop edges and thus we return NULL. */
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if (retval)
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return NULL;
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/* This is the first non-loop incoming edge we have found. Record
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it. */
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retval = e;
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}
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return retval;
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}
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/* Record any equivalences created by the incoming edge to BB into
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CONST_AND_COPIES and AVAIL_EXPRS_STACK. If BB has more than one
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incoming edge, then no equivalence is created. */
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@ -1107,7 +1073,7 @@ record_equivalences_from_incoming_edge (basic_block bb,
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the parent was followed. */
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parent = get_immediate_dominator (CDI_DOMINATORS, bb);
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e = single_incoming_edge_ignoring_loop_edges (bb);
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e = single_pred_edge_ignoring_loop_edges (bb, true);
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/* If we had a single incoming edge from our parent block, then enter
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any data associated with the edge into our tables. */
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@ -4847,34 +4847,18 @@ sccvn_dom_walker::after_dom_children (basic_block bb)
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edge
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sccvn_dom_walker::before_dom_children (basic_block bb)
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{
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edge e;
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edge_iterator ei;
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if (dump_file && (dump_flags & TDF_DETAILS))
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fprintf (dump_file, "Visiting BB %d\n", bb->index);
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/* If we have a single predecessor record the equivalence from a
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possible condition on the predecessor edge. */
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edge pred_e = NULL;
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FOR_EACH_EDGE (e, ei, bb->preds)
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{
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/* Ignore simple backedges from this to allow recording conditions
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in loop headers. */
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if (dominated_by_p (CDI_DOMINATORS, e->src, e->dest))
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continue;
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if (! pred_e)
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pred_e = e;
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else
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{
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pred_e = NULL;
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break;
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}
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}
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edge pred_e = single_pred_edge_ignoring_loop_edges (bb, false);
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if (pred_e)
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{
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/* Check if there are multiple executable successor edges in
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the source block. Otherwise there is no additional info
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to be recorded. */
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edge_iterator ei;
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edge e2;
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FOR_EACH_EDGE (e2, ei, pred_e->src->succs)
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if (e2 != pred_e
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@ -408,40 +408,10 @@ uncprop_into_successor_phis (basic_block bb)
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}
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}
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/* Ignoring loop backedges, if BB has precisely one incoming edge then
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return that edge. Otherwise return NULL. */
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static edge
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single_incoming_edge_ignoring_loop_edges (basic_block bb)
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{
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edge retval = NULL;
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edge e;
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edge_iterator ei;
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FOR_EACH_EDGE (e, ei, bb->preds)
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{
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/* A loop back edge can be identified by the destination of
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the edge dominating the source of the edge. */
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if (dominated_by_p (CDI_DOMINATORS, e->src, e->dest))
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continue;
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/* If we have already seen a non-loop edge, then we must have
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multiple incoming non-loop edges and thus we return NULL. */
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if (retval)
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return NULL;
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/* This is the first non-loop incoming edge we have found. Record
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it. */
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retval = e;
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}
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return retval;
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}
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edge
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uncprop_dom_walker::before_dom_children (basic_block bb)
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{
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basic_block parent;
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edge e;
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bool recorded = false;
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/* If this block is dominated by a single incoming edge and that edge
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parent = get_immediate_dominator (CDI_DOMINATORS, bb);
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if (parent)
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{
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e = single_incoming_edge_ignoring_loop_edges (bb);
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edge e = single_pred_edge_ignoring_loop_edges (bb, false);
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if (e && e->src == parent && e->aux)
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{
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@ -10970,33 +10970,17 @@ evrp_dom_walker::try_find_new_range (tree name,
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edge
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evrp_dom_walker::before_dom_children (basic_block bb)
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{
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tree op0 = NULL_TREE;
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edge_iterator ei;
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edge e;
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if (dump_file && (dump_flags & TDF_DETAILS))
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fprintf (dump_file, "Visiting BB%d\n", bb->index);
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stack.safe_push (std::make_pair (NULL_TREE, (value_range *)NULL));
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edge pred_e = NULL;
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FOR_EACH_EDGE (e, ei, bb->preds)
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{
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/* Ignore simple backedges from this to allow recording conditions
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in loop headers. */
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if (dominated_by_p (CDI_DOMINATORS, e->src, e->dest))
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continue;
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if (! pred_e)
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pred_e = e;
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else
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{
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pred_e = NULL;
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break;
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}
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}
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edge pred_e = single_pred_edge_ignoring_loop_edges (bb, false);
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if (pred_e)
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{
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gimple *stmt = last_stmt (pred_e->src);
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tree op0 = NULL_TREE;
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if (stmt
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&& gimple_code (stmt) == GIMPLE_COND
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&& (op0 = gimple_cond_lhs (stmt))
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/* Visit PHI stmts and discover any new VRs possible. */
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bool has_unvisited_preds = false;
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edge_iterator ei;
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edge e;
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FOR_EACH_EDGE (e, ei, bb->preds)
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if (e->flags & EDGE_EXECUTABLE
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&& !(e->src->flags & BB_VISITED))
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