174 lines
6.2 KiB
C++
174 lines
6.2 KiB
C++
/* Header file for the GIMPLE fold_using_range interface.
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Copyright (C) 2019-2023 Free Software Foundation, Inc.
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Contributed by Andrew MacLeod <amacleod@redhat.com>
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and Aldy Hernandez <aldyh@redhat.com>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_GIMPLE_RANGE_FOLD_H
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#define GCC_GIMPLE_RANGE_FOLD_H
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// This file is the main include point for gimple range folding.
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// These routines will fold stmt S into the result range R.
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// Any ssa_names on the stmt will be calculated using the range_query
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// parameter via a call to range_of_expr.
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// If no range_query is provided, current global range info will be used.
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// The second variation specifies an edge, and stmt S is recalculated as if
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// it appeared on that edge.
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// Fold stmt S into range R using range query Q.
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bool fold_range (vrange &r, gimple *s, range_query *q = NULL);
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// Recalculate stmt S into R using range query Q as if it were on edge ON_EDGE.
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bool fold_range (vrange &v, gimple *s, edge on_edge, range_query *q = NULL);
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// These routines the operands to be specified when manually folding.
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// Any excess queries will be drawn from the current range_query.
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bool fold_range (vrange &r, gimple *s, vrange &r1);
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bool fold_range (vrange &r, gimple *s, vrange &r1, vrange &r2);
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bool fold_range (vrange &r, gimple *s, unsigned num_elements, vrange **vector);
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// Return the type of range which statement S calculates. If the type is
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// unsupported or no type can be determined, return NULL_TREE.
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inline tree
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gimple_range_type (const gimple *s)
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{
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tree lhs = gimple_get_lhs (s);
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tree type = NULL_TREE;
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if (lhs)
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type = TREE_TYPE (lhs);
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else
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{
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enum gimple_code code = gimple_code (s);
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if (code == GIMPLE_COND)
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type = boolean_type_node;
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else if (code == GIMPLE_PHI)
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type = TREE_TYPE (gimple_phi_result (s));
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else if (code == GIMPLE_CALL)
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{
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type = gimple_call_fntype (s);
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// If it has a type, get the return type.
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if (type)
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type = TREE_TYPE (type);
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}
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}
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if (type && Value_Range::supports_type_p (type))
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return type;
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return NULL_TREE;
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}
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// Return EXP if it is an SSA_NAME with a type supported by gimple ranges.
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inline tree
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gimple_range_ssa_p (tree exp)
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{
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if (exp && TREE_CODE (exp) == SSA_NAME &&
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!SSA_NAME_IS_VIRTUAL_OPERAND (exp) &&
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!SSA_NAME_OCCURS_IN_ABNORMAL_PHI (exp) &&
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Value_Range::supports_type_p (TREE_TYPE (exp)))
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return exp;
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return NULL_TREE;
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}
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// Return true if TYPE1 and TYPE2 are compatible range types.
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inline bool
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range_compatible_p (tree type1, tree type2)
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{
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// types_compatible_p requires conversion in both directions to be useless.
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// GIMPLE only requires a cast one way in order to be compatible.
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// Ranges really only need the sign and precision to be the same.
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return (TYPE_PRECISION (type1) == TYPE_PRECISION (type2)
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&& TYPE_SIGN (type1) == TYPE_SIGN (type2));
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}
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// Source of all operands for fold_using_range and gori_compute.
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// It abstracts out the source of an operand so it can come from a stmt or
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// and edge or anywhere a derived class of fur_source wants.
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// The default simply picks up ranges from the current range_query.
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class fur_source
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{
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public:
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fur_source (range_query *q = NULL);
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inline range_query *query () { return m_query; }
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inline class gori_compute *gori () { return m_gori; };
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virtual bool get_operand (vrange &r, tree expr);
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virtual bool get_phi_operand (vrange &r, tree expr, edge e);
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virtual relation_kind query_relation (tree op1, tree op2);
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virtual void register_relation (gimple *stmt, relation_kind k, tree op1,
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tree op2);
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virtual void register_relation (edge e, relation_kind k, tree op1,
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tree op2);
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void register_outgoing_edges (gcond *, irange &lhs_range, edge e0, edge e1);
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protected:
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range_query *m_query;
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gori_compute *m_gori;
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};
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// fur_stmt is the specification for drawing an operand from range_query Q
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// via a range_of_Expr call on stmt S.
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class fur_stmt : public fur_source
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{
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public:
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fur_stmt (gimple *s, range_query *q = NULL);
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virtual bool get_operand (vrange &r, tree expr) override;
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virtual bool get_phi_operand (vrange &r, tree expr, edge e) override;
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virtual relation_kind query_relation (tree op1, tree op2) override;
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private:
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gimple *m_stmt;
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};
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// This version of fur_source will pick a range from a stmt, and also register
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// dependencies via a gori_compute object. This is mostly an internal API.
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class fur_depend : public fur_stmt
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{
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public:
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fur_depend (gimple *s, gori_compute *gori, range_query *q = NULL);
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virtual void register_relation (gimple *stmt, relation_kind k, tree op1,
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tree op2) override;
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virtual void register_relation (edge e, relation_kind k, tree op1,
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tree op2) override;
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protected:
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relation_oracle *m_oracle;
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};
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// This class uses ranges to fold a gimple statement producing a range for
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// the LHS. The source of all operands is supplied via the fur_source class
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// which provides a range_query as well as a source location and any other
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// required information.
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class fold_using_range
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{
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public:
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bool fold_stmt (vrange &r, gimple *s, class fur_source &src,
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tree name = NULL_TREE);
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protected:
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bool range_of_range_op (vrange &r, gimple_range_op_handler &handler,
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fur_source &src);
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bool range_of_call (vrange &r, gcall *call, fur_source &src);
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bool range_of_cond_expr (vrange &r, gassign* cond, fur_source &src);
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bool range_of_address (irange &r, gimple *s, fur_source &src);
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bool range_of_phi (vrange &r, gphi *phi, fur_source &src);
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void range_of_ssa_name_with_loop_info (vrange &, tree, class loop *, gphi *,
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fur_source &src);
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void relation_fold_and_or (irange& lhs_range, gimple *s, fur_source &src);
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};
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#endif // GCC_GIMPLE_RANGE_FOLD_H
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