/* Routines for expanding from SSA form to RTL.
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/* Routines for expanding from SSA form to RTL.
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Copyright (C) 2009 Free Software Foundation, Inc.
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Copyright (C) 2009 Free Software Foundation, Inc.
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This file is part of GCC.
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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
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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any later version.
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GCC is distributed in the hope that it will be useful,
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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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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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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<http://www.gnu.org/licenses/>. */
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#ifndef _SSAEXPAND_H
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#ifndef _SSAEXPAND_H
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#define _SSAEXPAND_H 1
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#define _SSAEXPAND_H 1
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#include "tree-ssa-live.h"
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#include "tree-ssa-live.h"
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/* This structure (of which only a singleton SA exists) is used to
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/* This structure (of which only a singleton SA exists) is used to
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pass around information between the outof-SSA functions, cfgexpand
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pass around information between the outof-SSA functions, cfgexpand
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and expand itself. */
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and expand itself. */
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struct ssaexpand
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struct ssaexpand
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{
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{
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/* The computed partitions of SSA names are stored here. */
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/* The computed partitions of SSA names are stored here. */
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var_map map;
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var_map map;
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/* For an SSA name version V bit V is set iff TER decided that
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/* For an SSA name version V bit V is set iff TER decided that
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its definition should be forwarded. */
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its definition should be forwarded. */
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bitmap values;
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bitmap values;
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/* For a partition number I partition_to_pseudo[I] contains the
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/* For a partition number I partition_to_pseudo[I] contains the
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RTL expression of the allocated space of it (either a MEM or
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RTL expression of the allocated space of it (either a MEM or
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a pseudos REG). */
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a pseudos REG). */
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rtx *partition_to_pseudo;
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rtx *partition_to_pseudo;
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/* If partition I contains an SSA name that has a default def,
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/* If partition I contains an SSA name that has a default def,
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bit I will be set in this bitmap. */
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bit I will be set in this bitmap. */
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bitmap partition_has_default_def;
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bitmap partition_has_default_def;
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};
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};
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/* This is the singleton described above. */
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/* This is the singleton described above. */
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extern struct ssaexpand SA;
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extern struct ssaexpand SA;
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/* Returns the RTX expression representing the storage of the outof-SSA
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/* Returns the RTX expression representing the storage of the outof-SSA
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partition that the SSA name EXP is a member of. */
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partition that the SSA name EXP is a member of. */
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static inline rtx
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static inline rtx
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get_rtx_for_ssa_name (tree exp)
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get_rtx_for_ssa_name (tree exp)
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{
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{
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int p = partition_find (SA.map->var_partition, SSA_NAME_VERSION (exp));
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int p = partition_find (SA.map->var_partition, SSA_NAME_VERSION (exp));
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if (SA.map->partition_to_view)
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if (SA.map->partition_to_view)
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p = SA.map->partition_to_view[p];
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p = SA.map->partition_to_view[p];
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gcc_assert (p != NO_PARTITION);
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gcc_assert (p != NO_PARTITION);
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return SA.partition_to_pseudo[p];
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return SA.partition_to_pseudo[p];
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}
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}
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/* If TER decided to forward the definition of SSA name EXP this function
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/* If TER decided to forward the definition of SSA name EXP this function
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returns the defining statement, otherwise NULL. */
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returns the defining statement, otherwise NULL. */
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static inline gimple
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static inline gimple
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get_gimple_for_ssa_name (tree exp)
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get_gimple_for_ssa_name (tree exp)
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{
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{
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int v = SSA_NAME_VERSION (exp);
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int v = SSA_NAME_VERSION (exp);
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if (SA.values && bitmap_bit_p (SA.values, v))
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if (SA.values && bitmap_bit_p (SA.values, v))
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return SSA_NAME_DEF_STMT (exp);
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return SSA_NAME_DEF_STMT (exp);
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return NULL;
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return NULL;
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}
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}
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/* In tree-outof-ssa.c. */
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/* In tree-outof-ssa.c. */
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void finish_out_of_ssa (struct ssaexpand *sa);
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void finish_out_of_ssa (struct ssaexpand *sa);
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unsigned int rewrite_out_of_ssa (struct ssaexpand *sa);
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unsigned int rewrite_out_of_ssa (struct ssaexpand *sa);
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void expand_phi_nodes (struct ssaexpand *sa);
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void expand_phi_nodes (struct ssaexpand *sa);
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#endif
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#endif
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