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// RTL SSA classes related to changing instructions -*- C++ -*-
// Copyright (C) 2020-2022 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
// GCC is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3, or (at your option) any later
// version.
//
// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with GCC; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
namespace rtl_ssa {
// A class that describes a change that we're considering making to an
// instruction. There are three choices:
//
// (1) delete the instruction
// (2) replace the instruction with a new instruction in-place
// (3) replace the instruction with a new instruction at a different location
//
// Anything related to the "new instruction" is irrelevant for (1).
//
// The class doesn't actually change anything itself, it simply records
// something that we might do.
class insn_change
{
public:
enum delete_action { DELETE };
// Construct a possible change to INSN.
insn_change (insn_info *insn);
// Construct a possible deletion of INSN.
insn_change (insn_info *insn, delete_action);
// The instruction that we would change.
insn_info *insn () const { return m_insn; }
// The rtx_insn of the instruction that we would change.
rtx_insn *rtl () const { return m_insn->rtl (); }
// The basic block that contains insn ().
bb_info *bb () const { return m_insn->bb (); }
// The extended basic block that contains insn ().
ebb_info *ebb () const { return m_insn->ebb (); }
// The uid of the instruction that we would change.
unsigned int insn_uid () const { return m_insn->uid (); }
// The list of things that the original instruction defined and used.
def_array old_defs () const { return m_insn->defs (); }
use_array old_uses () const { return m_insn->uses (); }
// The cost of the original instruction, as calculated by the target.
unsigned int old_cost () const { return m_insn->cost (); }
// Return true if the original instruction would simply be deleted,
// rather than being replaced by a new instruction.
bool is_deletion () const { return m_is_deletion; }
// Print a description of the change to PP.
void print (pretty_printer *pp) const;
// Return an insn_change for deleting INSN.
static insn_change delete_insn (insn_info *insn) { return { insn, DELETE }; }
private:
// The value returned by insn ().
insn_info *m_insn;
public:
// The list of things that the new instruction would define and use.
def_array new_defs;
use_array new_uses;
// The range of instructions after which the instruction could be placed.
// The range can include INSN itself: placing the instruction after either
// INSN or INSN->prev_nondebug_insn () is equivalent to not moving the
// instruction.
insn_range_info move_range;
// The cost that the new instruction would have, as calculated by the target.
unsigned int new_cost;
private:
// The value returned by is_deletion ().
bool m_is_deletion;
};
// A class that represents a closure of the two-argument form of
// insn_is_changing. See the comment above the one-argument form
// for details.
class insn_is_changing_closure
{
public:
insn_is_changing_closure (array_slice<insn_change *const> changes);
bool operator() (const insn_info *) const;
private:
array_slice<insn_change *const> m_changes;
};
void pp_insn_change (pretty_printer *, const insn_change &);
}
void dump (FILE *, const rtl_ssa::insn_change &);
void DEBUG_FUNCTION debug (const rtl_ssa::insn_change &);
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