119 lines
3.8 KiB
C++
119 lines
3.8 KiB
C++
// RTL SSA classes related to changing instructions -*- C++ -*-
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// Copyright (C) 2020-2021 Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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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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//
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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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//
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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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namespace rtl_ssa {
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// A class that describes a change that we're considering making to an
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// instruction. There are three choices:
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//
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// (1) delete the instruction
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// (2) replace the instruction with a new instruction in-place
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// (3) replace the instruction with a new instruction at a different location
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//
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// Anything related to the "new instruction" is irrelevant for (1).
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//
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// The class doesn't actually change anything itself, it simply records
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// something that we might do.
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class insn_change
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{
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public:
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enum delete_action { DELETE };
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// Construct a possible change to INSN.
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insn_change (insn_info *insn);
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// Construct a possible deletion of INSN.
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insn_change (insn_info *insn, delete_action);
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// The instruction that we would change.
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insn_info *insn () const { return m_insn; }
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// The rtx_insn of the instruction that we would change.
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rtx_insn *rtl () const { return m_insn->rtl (); }
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// The basic block that contains insn ().
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bb_info *bb () const { return m_insn->bb (); }
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// The extended basic block that contains insn ().
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ebb_info *ebb () const { return m_insn->ebb (); }
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// The uid of the instruction that we would change.
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unsigned int insn_uid () const { return m_insn->uid (); }
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// The list of things that the original instruction defined and used.
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def_array old_defs () const { return m_insn->defs (); }
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use_array old_uses () const { return m_insn->uses (); }
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// The cost of the original instruction, as calculated by the target.
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unsigned int old_cost () const { return m_insn->cost (); }
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// Return true if the original instruction would simply be deleted,
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// rather than being replaced by a new instruction.
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bool is_deletion () const { return m_is_deletion; }
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// Print a description of the change to PP.
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void print (pretty_printer *pp) const;
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// Return an insn_change for deleting INSN.
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static insn_change delete_insn (insn_info *insn) { return { insn, DELETE }; }
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private:
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// The value returned by insn ().
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insn_info *m_insn;
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public:
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// The list of things that the new instruction would define and use.
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def_array new_defs;
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use_array new_uses;
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// The range of instructions after which the instruction could be placed.
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// The range can include INSN itself: placing the instruction after either
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// INSN or INSN->prev_nondebug_insn () is equivalent to not moving the
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// instruction.
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insn_range_info move_range;
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// The cost that the new instruction would have, as calculated by the target.
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unsigned int new_cost;
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private:
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// The value returned by is_deletion ().
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bool m_is_deletion;
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};
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// A class that represents a closure of the two-argument form of
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// insn_is_changing. See the comment above the one-argument form
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// for details.
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class insn_is_changing_closure
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{
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public:
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insn_is_changing_closure (array_slice<insn_change *const> changes);
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bool operator() (const insn_info *) const;
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private:
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array_slice<insn_change *const> m_changes;
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};
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void pp_insn_change (pretty_printer *, const insn_change &);
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}
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void dump (FILE *, const rtl_ssa::insn_change &);
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void DEBUG_FUNCTION debug (const rtl_ssa::insn_change &);
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