value_range *pop_value_range (tree var);
value_range *try_find_new_range (tree, tree op, tree_code code, tree limit);
+ void record_ranges_from_incoming_edge (basic_block);
+ void record_ranges_from_phis (basic_block);
+ void record_ranges_from_stmt (gimple *);
+
/* STACK holds the old VR. */
auto_vec<std::pair <tree, value_range*> > stack;
bitmap need_eh_cleanup;
return NULL;
}
-/* See if there is any new scope is entered with new VR and set that VR to
- ssa_name before visiting the statements in the scope. */
+/* If BB is reached by a single incoming edge (ignoring loop edges),
+ then derive ranges implied by traversing that edge. */
-edge
-evrp_dom_walker::before_dom_children (basic_block bb)
+void
+evrp_dom_walker::record_ranges_from_incoming_edge (basic_block bb)
{
- if (dump_file && (dump_flags & TDF_DETAILS))
- fprintf (dump_file, "Visiting BB%d\n", bb->index);
-
- stack.safe_push (std::make_pair (NULL_TREE, (value_range *)NULL));
-
+/* See if there is any new scope is entered with new VR and set that VR to
+ ssa_name before visiting the statements in the scope. */
edge pred_e = single_pred_edge_ignoring_loop_edges (bb, false);
if (pred_e)
{
push_value_range (vrs[i].first, vrs[i].second);
}
}
+}
+
+/* Record ranges from any PHI nodes at the start of basic block BB. */
+void
+evrp_dom_walker::record_ranges_from_phis (basic_block bb)
+{
/* Visit PHI stmts and discover any new VRs possible. */
bool has_unvisited_preds = false;
edge_iterator ei;
}
update_value_range (lhs, &vr_result);
- /* Mark PHIs whose lhs we fully propagate for removal. */
- tree val = op_with_constant_singleton_value_range (lhs);
- if (val && may_propagate_copy (lhs, val))
- {
- stmts_to_remove.safe_push (phi);
- continue;
- }
-
/* Set the SSA with the value range. */
if (INTEGRAL_TYPE_P (TREE_TYPE (lhs)))
{
vr_result.max) == 1)))
set_ptr_nonnull (lhs);
}
+}
+
+/* Record any ranges created by statement STMT. */
+
+void
+evrp_dom_walker::record_ranges_from_stmt (gimple *stmt)
+{
+ tree output = NULL_TREE;
+
+ if (dyn_cast <gcond *> (stmt))
+ ;
+ else if (stmt_interesting_for_vrp (stmt))
+ {
+ edge taken_edge;
+ value_range vr = VR_INITIALIZER;
+ extract_range_from_stmt (stmt, &taken_edge, &output, &vr);
+ if (output && (vr.type == VR_RANGE || vr.type == VR_ANTI_RANGE))
+ {
+ update_value_range (output, &vr);
+
+ /* Set the SSA with the value range. */
+ if (INTEGRAL_TYPE_P (TREE_TYPE (output)))
+ {
+ if ((vr.type == VR_RANGE || vr.type == VR_ANTI_RANGE)
+ && (TREE_CODE (vr.min) == INTEGER_CST)
+ && (TREE_CODE (vr.max) == INTEGER_CST))
+ set_range_info (output, vr.type,
+ wi::to_wide (vr.min),
+ wi::to_wide (vr.max));
+ }
+ else if (POINTER_TYPE_P (TREE_TYPE (output))
+ && ((vr.type == VR_RANGE
+ && range_includes_zero_p (vr.min, vr.max) == 0)
+ || (vr.type == VR_ANTI_RANGE
+ && range_includes_zero_p (vr.min, vr.max) == 1)))
+ set_ptr_nonnull (output);
+ }
+ else
+ set_defs_to_varying (stmt);
+ }
+ else
+ set_defs_to_varying (stmt);
+
+ /* See if we can derive a range for any of STMT's operands. */
+ tree op;
+ ssa_op_iter i;
+ FOR_EACH_SSA_TREE_OPERAND (op, stmt, i, SSA_OP_USE)
+ {
+ tree value;
+ enum tree_code comp_code;
+
+ /* If OP is used in such a way that we can infer a value
+ range for it, and we don't find a previous assertion for
+ it, create a new assertion location node for OP. */
+ if (infer_value_range (stmt, op, &comp_code, &value))
+ {
+ /* If we are able to infer a nonzero value range for OP,
+ then walk backwards through the use-def chain to see if OP
+ was set via a typecast.
+ If so, then we can also infer a nonzero value range
+ for the operand of the NOP_EXPR. */
+ if (comp_code == NE_EXPR && integer_zerop (value))
+ {
+ tree t = op;
+ gimple *def_stmt = SSA_NAME_DEF_STMT (t);
+ while (is_gimple_assign (def_stmt)
+ && CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (def_stmt))
+ && TREE_CODE (gimple_assign_rhs1 (def_stmt)) == SSA_NAME
+ && POINTER_TYPE_P
+ (TREE_TYPE (gimple_assign_rhs1 (def_stmt))))
+ {
+ t = gimple_assign_rhs1 (def_stmt);
+ def_stmt = SSA_NAME_DEF_STMT (t);
+
+ /* Add VR when (T COMP_CODE value) condition is true. */
+ value_range *op_range
+ = try_find_new_range (t, t, comp_code, value);
+ if (op_range)
+ push_value_range (t, op_range);
+ }
+ }
+ /* Add VR when (OP COMP_CODE value) condition is true. */
+ value_range *op_range = try_find_new_range (op, op,
+ comp_code, value);
+ if (op_range)
+ push_value_range (op, op_range);
+ }
+ }
+}
+
+edge
+evrp_dom_walker::before_dom_children (basic_block bb)
+{
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "Visiting BB%d\n", bb->index);
+
+ stack.safe_push (std::make_pair (NULL_TREE, (value_range *)NULL));
+ record_ranges_from_incoming_edge (bb);
+ record_ranges_from_phis (bb);
+
+ for (gphi_iterator gpi = gsi_start_phis (bb);
+ !gsi_end_p (gpi); gsi_next (&gpi))
+ {
+ gphi *phi = gpi.phi ();
+ tree lhs = PHI_RESULT (phi);
+ if (virtual_operand_p (lhs))
+ continue;
+
+ /* Mark PHIs whose lhs we fully propagate for removal. */
+ tree val = op_with_constant_singleton_value_range (lhs);
+ if (val && may_propagate_copy (lhs, val))
+ {
+ stmts_to_remove.safe_push (phi);
+ continue;
+ }
+ }
edge taken_edge = NULL;
print_gimple_stmt (dump_file, stmt, 0);
}
+ record_ranges_from_stmt (stmt);
if (gcond *cond = dyn_cast <gcond *> (stmt))
{
vrp_visit_cond_stmt (cond, &taken_edge);
}
else if (stmt_interesting_for_vrp (stmt))
{
- edge taken_edge;
value_range vr = VR_INITIALIZER;
- extract_range_from_stmt (stmt, &taken_edge, &output, &vr);
- if (output
- && (vr.type == VR_RANGE || vr.type == VR_ANTI_RANGE))
+ output = get_output_for_vrp (stmt);
+ if (output)
{
- update_value_range (output, &vr);
vr = *get_value_range (output);
/* Mark stmts whose output we fully propagate for removal. */
tree val;
- if ((val = op_with_constant_singleton_value_range (output))
+ if ((vr.type == VR_RANGE || vr.type == VR_ANTI_RANGE)
+ && (val = op_with_constant_singleton_value_range (output))
&& may_propagate_copy (output, val)
&& !stmt_could_throw_p (stmt)
&& !gimple_has_side_effects (stmt))
stmts_to_remove.safe_push (stmt);
continue;
}
-
- /* Set the SSA with the value range. */
- if (INTEGRAL_TYPE_P (TREE_TYPE (output)))
- {
- if ((vr.type == VR_RANGE
- || vr.type == VR_ANTI_RANGE)
- && (TREE_CODE (vr.min) == INTEGER_CST)
- && (TREE_CODE (vr.max) == INTEGER_CST))
- set_range_info (output, vr.type,
- wi::to_wide (vr.min),
- wi::to_wide (vr.max));
- }
- else if (POINTER_TYPE_P (TREE_TYPE (output))
- && ((vr.type == VR_RANGE
- && range_includes_zero_p (vr.min,
- vr.max) == 0)
- || (vr.type == VR_ANTI_RANGE
- && range_includes_zero_p (vr.min,
- vr.max) == 1)))
- set_ptr_nonnull (output);
- }
- else
- set_defs_to_varying (stmt);
- }
- else
- set_defs_to_varying (stmt);
-
- /* See if we can derive a range for any of STMT's operands. */
- tree op;
- ssa_op_iter i;
- FOR_EACH_SSA_TREE_OPERAND (op, stmt, i, SSA_OP_USE)
- {
- tree value;
- enum tree_code comp_code;
-
- /* If OP is used in such a way that we can infer a value
- range for it, and we don't find a previous assertion for
- it, create a new assertion location node for OP. */
- if (infer_value_range (stmt, op, &comp_code, &value))
- {
- /* If we are able to infer a nonzero value range for OP,
- then walk backwards through the use-def chain to see if OP
- was set via a typecast.
- If so, then we can also infer a nonzero value range
- for the operand of the NOP_EXPR. */
- if (comp_code == NE_EXPR && integer_zerop (value))
- {
- tree t = op;
- gimple *def_stmt = SSA_NAME_DEF_STMT (t);
- while (is_gimple_assign (def_stmt)
- && CONVERT_EXPR_CODE_P
- (gimple_assign_rhs_code (def_stmt))
- && TREE_CODE
- (gimple_assign_rhs1 (def_stmt)) == SSA_NAME
- && POINTER_TYPE_P
- (TREE_TYPE (gimple_assign_rhs1 (def_stmt))))
- {
- t = gimple_assign_rhs1 (def_stmt);
- def_stmt = SSA_NAME_DEF_STMT (t);
-
- /* Add VR when (T COMP_CODE value) condition is
- true. */
- value_range *op_range
- = try_find_new_range (t, t, comp_code, value);
- if (op_range)
- push_value_range (t, op_range);
- }
- }
- /* Add VR when (OP COMP_CODE value) condition is true. */
- value_range *op_range = try_find_new_range (op, op,
- comp_code, value);
- if (op_range)
- push_value_range (op, op_range);
}
}
}
/* Visit BB successor PHI nodes and replace PHI args. */
+ edge e;
+ edge_iterator ei;
FOR_EACH_EDGE (e, ei, bb->succs)
{
for (gphi_iterator gpi = gsi_start_phis (e->dest);
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