Coalesce SSA_NAMES together for the out-of-ssa pass.
Copyright (C) 2004-2024 Free Software Foundation, Inc.
Contributed by Andrew MacLeod <amacleod@redhat.com>
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/>.
This set of routines implements a coalesce_list. This is an object which
is used to track pairs of ssa_names which are desirable to coalesce
together to avoid copies. Costs are associated with each pair, and when
all desired information has been collected, the object can be used to
order the pairs for processing.
This structure defines a pair entry.
1.10.0