/* Rewrite a program in Normal form into SSA.
- Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
Free Software Foundation, Inc.
Contributed by Diego Novillo <dnovillo@redhat.com>
#include "diagnostic.h"
#include "bitmap.h"
#include "tree-flow.h"
-#include "tree-gimple.h"
+#include "gimple.h"
#include "tree-inline.h"
#include "varray.h"
#include "timevar.h"
#include "params.h"
#include "vecprim.h"
+
/* This file builds the SSA form for a function as described in:
R. Cytron, J. Ferrante, B. Rosen, M. Wegman, and K. Zadeck. Efficiently
Computing Static Single Assignment Form and the Control Dependence
associated with the current block. */
static VEC(tree,heap) *block_defs_stack;
+
/* Set of existing SSA names being replaced by update_ssa. */
static sbitmap old_ssa_names;
the operations done on them are presence tests. */
static sbitmap new_ssa_names;
-/* Symbols whose SSA form needs to be updated or created for the first
- time. */
-static bitmap syms_to_rename;
-
-/* Subset of SYMS_TO_RENAME. Contains all the GIMPLE register symbols
- that have been marked for renaming. */
-static bitmap regs_to_rename;
-
-/* Subset of SYMS_TO_RENAME. Contains all the memory symbols
- that have been marked for renaming. */
-static bitmap mem_syms_to_rename;
/* Set of SSA names that have been marked to be released after they
were registered in the replacement table. They will be finally
released after we finish updating the SSA web. */
static bitmap names_to_release;
-/* For each block, the PHI nodes that need to be rewritten are stored into
- these vectors. */
-typedef VEC(tree, heap) *tree_vec;
-DEF_VEC_P (tree_vec);
-DEF_VEC_ALLOC_P (tree_vec, heap);
-
-static VEC(tree_vec, heap) *phis_to_rewrite;
+static VEC(gimple_vec, heap) *phis_to_rewrite;
/* The bitmap of non-NULL elements of PHIS_TO_REWRITE. */
static bitmap blocks_with_phis_to_rewrite;
bitmap set;
};
+
/* NEW -> OLD_SET replacement table. If we are replacing several
existing SSA names O_1, O_2, ..., O_j with a new name N_i,
then REPL_TBL[N_i] = { O_1, O_2, ..., O_j }. */
static htab_t repl_tbl;
-/* true if register_new_name_mapping needs to initialize the data
- structures needed by update_ssa. */
-static bool need_to_initialize_update_ssa_p = true;
-
-/* true if update_ssa needs to update virtual operands. */
-static bool need_to_update_vops_p = false;
+/* The function the SSA updating data structures have been initialized for.
+ NULL if they need to be initialized by register_new_name_mapping. */
+static struct function *update_ssa_initialized_fn = NULL;
/* Statistics kept by update_ssa to use in the virtual mapping
heuristic. If the number of virtual mappings is beyond certain
ENUM_BITFIELD (need_phi_state) need_phi_state : 2;
/* Age of this record (so that info_for_ssa_name table can be cleared
- quicky); if AGE < CURRENT_INFO_FOR_SSA_NAME_AGE, then the fields
+ quickly); if AGE < CURRENT_INFO_FOR_SSA_NAME_AGE, then the fields
are assumed to be null. */
unsigned age;
};
};
-/* Use TREE_VISITED to keep track of which statements we want to
- rename. When renaming a subset of the variables, not all
- statements will be processed. This is decided in mark_def_sites. */
-#define REWRITE_THIS_STMT(T) TREE_VISITED (T)
-
-/* Use the unsigned flag to keep track of which statements we want to
- visit when marking new definition sites. This is slightly
- different than REWRITE_THIS_STMT: it's used by update_ssa to
- distinguish statements that need to have both uses and defs
- processed from those that only need to have their defs processed.
- Statements that define new SSA names only need to have their defs
- registered, but they don't need to have their uses renamed. */
-#define REGISTER_DEFS_IN_THIS_STMT(T) (T)->base.unsigned_flag
/* Prototypes for debugging functions. */
extern void dump_currdefs (FILE *);
extern void debug_currdefs (void);
+/* Return true if STMT needs to be rewritten. When renaming a subset
+ of the variables, not all statements will be processed. This is
+ decided in mark_def_sites. */
+
+static inline bool
+rewrite_uses_p (gimple stmt)
+{
+ return gimple_visited_p (stmt);
+}
+
+
+/* Set the rewrite marker on STMT to the value given by REWRITE_P. */
+
+static inline void
+set_rewrite_uses (gimple stmt, bool rewrite_p)
+{
+ gimple_set_visited (stmt, rewrite_p);
+}
+
+
+/* Return true if the DEFs created by statement STMT should be
+ registered when marking new definition sites. This is slightly
+ different than rewrite_uses_p: it's used by update_ssa to
+ distinguish statements that need to have both uses and defs
+ processed from those that only need to have their defs processed.
+ Statements that define new SSA names only need to have their defs
+ registered, but they don't need to have their uses renamed. */
+
+static inline bool
+register_defs_p (gimple stmt)
+{
+ return gimple_plf (stmt, GF_PLF_1) != 0;
+}
+
+
+/* If REGISTER_DEFS_P is true, mark STMT to have its DEFs registered. */
+
+static inline void
+set_register_defs (gimple stmt, bool register_defs_p)
+{
+ gimple_set_plf (stmt, GF_PLF_1, register_defs_p);
+}
+
+
/* Get the information associated with NAME. */
static inline ssa_name_info_p
info = VEC_index (ssa_name_info_p, info_for_ssa_name, ver);
if (info->age < current_info_for_ssa_name_age)
{
- info->need_phi_state = 0;
+ info->need_phi_state = NEED_PHI_STATE_UNKNOWN;
info->current_def = NULL_TREE;
info->age = current_info_for_ssa_name_age;
}
}
-/* Compute global livein information given the set of blockx where
+/* Compute global livein information given the set of blocks where
an object is locally live at the start of the block (LIVEIN)
and the set of blocks where the object is defined (DEF_BLOCKS).
for LIVEIN). */
void
-compute_global_livein (bitmap livein, bitmap def_blocks)
+compute_global_livein (bitmap livein ATTRIBUTE_UNUSED, bitmap def_blocks ATTRIBUTE_UNUSED)
{
basic_block bb, *worklist, *tos;
unsigned i;
static void
initialize_flags_in_bb (basic_block bb)
{
- tree phi, stmt;
- block_stmt_iterator bsi;
+ gimple stmt;
+ gimple_stmt_iterator gsi;
- for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
+ for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
- REWRITE_THIS_STMT (phi) = 0;
- REGISTER_DEFS_IN_THIS_STMT (phi) = 0;
+ gimple phi = gsi_stmt (gsi);
+ set_rewrite_uses (phi, false);
+ set_register_defs (phi, false);
}
- for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
- stmt = bsi_stmt (bsi);
+ stmt = gsi_stmt (gsi);
+
/* We are going to use the operand cache API, such as
SET_USE, SET_DEF, and FOR_EACH_IMM_USE_FAST. The operand
cache for each statement should be up-to-date. */
- gcc_assert (!stmt_modified_p (stmt));
- REWRITE_THIS_STMT (stmt) = 0;
- REGISTER_DEFS_IN_THIS_STMT (stmt) = 0;
+ gcc_assert (!gimple_modified_p (stmt));
+ set_rewrite_uses (stmt, false);
+ set_register_defs (stmt, false);
}
}
static inline bool
symbol_marked_for_renaming (tree sym)
{
- return bitmap_bit_p (syms_to_rename, DECL_UID (sym));
+ return bitmap_bit_p (SYMS_TO_RENAME (cfun), DECL_UID (sym));
}
is_old_name (tree name)
{
unsigned ver = SSA_NAME_VERSION (name);
+ if (!new_ssa_names)
+ return false;
return ver < new_ssa_names->n_bits && TEST_BIT (old_ssa_names, ver);
}
is_new_name (tree name)
{
unsigned ver = SSA_NAME_VERSION (name);
+ if (!new_ssa_names)
+ return false;
return ver < new_ssa_names->n_bits && TEST_BIT (new_ssa_names, ver);
}
}
-/* Return the names replaced by NEW (i.e., REPL_TBL[NEW].SET). */
+/* Return the names replaced by NEW_TREE (i.e., REPL_TBL[NEW_TREE].SET). */
static inline bitmap
-names_replaced_by (tree new)
+names_replaced_by (tree new_tree)
{
struct repl_map_d m;
void **slot;
- m.name = new;
+ m.name = new_tree;
slot = htab_find_slot (repl_tbl, (void *) &m, NO_INSERT);
/* If N was not registered in the replacement table, return NULL. */
}
-/* Add OLD to REPL_TBL[NEW].SET. */
+/* Add OLD to REPL_TBL[NEW_TREE].SET. */
static inline void
-add_to_repl_tbl (tree new, tree old)
+add_to_repl_tbl (tree new_tree, tree old)
{
struct repl_map_d m, *mp;
void **slot;
- m.name = new;
+ m.name = new_tree;
slot = htab_find_slot (repl_tbl, (void *) &m, INSERT);
if (*slot == NULL)
{
mp = XNEW (struct repl_map_d);
- mp->name = new;
+ mp->name = new_tree;
mp->set = BITMAP_ALLOC (NULL);
*slot = (void *) mp;
}
}
-/* Add a new mapping NEW -> OLD REPL_TBL. Every entry N_i in REPL_TBL
+/* Add a new mapping NEW_TREE -> OLD REPL_TBL. Every entry N_i in REPL_TBL
represents the set of names O_1 ... O_j replaced by N_i. This is
used by update_ssa and its helpers to introduce new SSA names in an
already formed SSA web. */
static void
-add_new_name_mapping (tree new, tree old)
+add_new_name_mapping (tree new_tree, tree old)
{
timevar_push (TV_TREE_SSA_INCREMENTAL);
- /* OLD and NEW must be different SSA names for the same symbol. */
- gcc_assert (new != old && SSA_NAME_VAR (new) == SSA_NAME_VAR (old));
+ /* OLD and NEW_TREE must be different SSA names for the same symbol. */
+ gcc_assert (new_tree != old && SSA_NAME_VAR (new_tree) == SSA_NAME_VAR (old));
/* If this mapping is for virtual names, we will need to update
virtual operands. If this is a mapping for .MEM, then we gather
the symbols associated with each name. */
- if (!is_gimple_reg (new))
+ if (!is_gimple_reg (new_tree))
{
tree sym;
- need_to_update_vops_p = true;
-
update_ssa_stats.num_virtual_mappings++;
update_ssa_stats.num_virtual_symbols++;
will make more sense to rename the symbols from scratch.
Otherwise, the insertion of PHI nodes for each of the old
names in these mappings will be very slow. */
- sym = SSA_NAME_VAR (new);
+ sym = SSA_NAME_VAR (new_tree);
bitmap_set_bit (update_ssa_stats.virtual_symbols, DECL_UID (sym));
}
}
/* Update the REPL_TBL table. */
- add_to_repl_tbl (new, old);
+ add_to_repl_tbl (new_tree, old);
/* If OLD had already been registered as a new name, then all the
- names that OLD replaces should also be replaced by NEW. */
+ names that OLD replaces should also be replaced by NEW_TREE. */
if (is_new_name (old))
- bitmap_ior_into (names_replaced_by (new), names_replaced_by (old));
+ bitmap_ior_into (names_replaced_by (new_tree), names_replaced_by (old));
- /* Register NEW and OLD in NEW_SSA_NAMES and OLD_SSA_NAMES,
+ /* Register NEW_TREE and OLD in NEW_SSA_NAMES and OLD_SSA_NAMES,
respectively. */
- SET_BIT (new_ssa_names, SSA_NAME_VERSION (new));
+ SET_BIT (new_ssa_names, SSA_NAME_VERSION (new_tree));
SET_BIT (old_ssa_names, SSA_NAME_VERSION (old));
/* Update mapping counter to use in the virtual mapping heuristic. */
static void
mark_def_sites (struct dom_walk_data *walk_data, basic_block bb,
- block_stmt_iterator bsi)
+ gimple_stmt_iterator gsi)
{
struct mark_def_sites_global_data *gd;
bitmap kills;
- tree stmt, def;
+ tree def;
+ gimple stmt;
use_operand_p use_p;
ssa_op_iter iter;
- stmt = bsi_stmt (bsi);
- update_stmt_if_modified (stmt);
+ /* Since this is the first time that we rewrite the program into SSA
+ form, force an operand scan on every statement. */
+ stmt = gsi_stmt (gsi);
+ update_stmt (stmt);
gd = (struct mark_def_sites_global_data *) walk_data->global_data;
kills = gd->kills;
gcc_assert (blocks_to_update == NULL);
- REGISTER_DEFS_IN_THIS_STMT (stmt) = 0;
- REWRITE_THIS_STMT (stmt) = 0;
+ set_register_defs (stmt, false);
+ set_rewrite_uses (stmt, false);
/* If a variable is used before being set, then the variable is live
across a block boundary, so mark it live-on-entry to BB. */
gcc_assert (DECL_P (sym));
if (!bitmap_bit_p (kills, DECL_UID (sym)))
set_livein_block (sym, bb);
- REWRITE_THIS_STMT (stmt) = 1;
+ set_rewrite_uses (stmt, true);
}
/* Now process the defs. Mark BB as the definition block and add
gcc_assert (DECL_P (def));
set_def_block (def, bb, false);
bitmap_set_bit (kills, DECL_UID (def));
- REGISTER_DEFS_IN_THIS_STMT (stmt) = 1;
+ set_register_defs (stmt, true);
}
/* If we found the statement interesting then also mark the block BB
as interesting. */
- if (REWRITE_THIS_STMT (stmt) || REGISTER_DEFS_IN_THIS_STMT (stmt))
+ if (rewrite_uses_p (stmt) || register_defs_p (stmt))
SET_BIT (gd->interesting_blocks, bb->index);
}
static int
cmp_dfsnum (const void *a, const void *b)
{
- const struct dom_dfsnum *da = a;
- const struct dom_dfsnum *db = b;
+ const struct dom_dfsnum *const da = (const struct dom_dfsnum *) a;
+ const struct dom_dfsnum *const db = (const struct dom_dfsnum *) b;
return (int) da->dfs_num - (int) db->dfs_num;
}
free (defs);
}
-/* Given a set of blocks with variable definitions (DEF_BLOCKS),
- return a bitmap with all the blocks in the iterated dominance
- frontier of the blocks in DEF_BLOCKS. DFS contains dominance
- frontier information as returned by compute_dominance_frontiers.
-
- The resulting set of blocks are the potential sites where PHI nodes
- are needed. The caller is responsible for freeing the memory
- allocated for the return value. */
-
-static bitmap
-compute_idf (bitmap def_blocks, bitmap *dfs)
-{
- bitmap_iterator bi;
- unsigned bb_index, i;
- VEC(int,heap) *work_stack;
- bitmap phi_insertion_points;
-
- work_stack = VEC_alloc (int, heap, n_basic_blocks);
- phi_insertion_points = BITMAP_ALLOC (NULL);
-
- /* Seed the work list with all the blocks in DEF_BLOCKS. We use
- VEC_quick_push here for speed. This is safe because we know that
- the number of definition blocks is no greater than the number of
- basic blocks, which is the initial capacity of WORK_STACK. */
- EXECUTE_IF_SET_IN_BITMAP (def_blocks, 0, bb_index, bi)
- VEC_quick_push (int, work_stack, bb_index);
-
- /* Pop a block off the worklist, add every block that appears in
- the original block's DF that we have not already processed to
- the worklist. Iterate until the worklist is empty. Blocks
- which are added to the worklist are potential sites for
- PHI nodes. */
- while (VEC_length (int, work_stack) > 0)
- {
- bb_index = VEC_pop (int, work_stack);
-
- /* Since the registration of NEW -> OLD name mappings is done
- separately from the call to update_ssa, when updating the SSA
- form, the basic blocks where new and/or old names are defined
- may have disappeared by CFG cleanup calls. In this case,
- we may pull a non-existing block from the work stack. */
- gcc_assert (bb_index < (unsigned) last_basic_block);
-
- EXECUTE_IF_AND_COMPL_IN_BITMAP (dfs[bb_index], phi_insertion_points,
- 0, i, bi)
- {
- /* Use a safe push because if there is a definition of VAR
- in every basic block, then WORK_STACK may eventually have
- more than N_BASIC_BLOCK entries. */
- VEC_safe_push (int, heap, work_stack, i);
- bitmap_set_bit (phi_insertion_points, i);
- }
- }
-
- VEC_free (int, heap, work_stack);
-
- return phi_insertion_points;
-}
-
-
/* Return the set of blocks where variable VAR is defined and the blocks
where VAR is live on entry (livein). Return NULL, if no entry is
found in DEF_BLOCKS. */
if (ddef == NULL_TREE)
{
- ddef = make_ssa_name (sym, build_empty_stmt ());
+ ddef = make_ssa_name (sym, gimple_build_nop ());
set_default_def (sym, ddef);
}
/* Marks phi node PHI in basic block BB for rewrite. */
static void
-mark_phi_for_rewrite (basic_block bb, tree phi)
+mark_phi_for_rewrite (basic_block bb, gimple phi)
{
- tree_vec phis;
+ gimple_vec phis;
unsigned i, idx = bb->index;
- if (REWRITE_THIS_STMT (phi))
+ if (rewrite_uses_p (phi))
return;
- REWRITE_THIS_STMT (phi) = 1;
+ set_rewrite_uses (phi, true);
if (!blocks_with_phis_to_rewrite)
return;
bitmap_set_bit (blocks_with_phis_to_rewrite, idx);
- VEC_reserve (tree_vec, heap, phis_to_rewrite, last_basic_block + 1);
- for (i = VEC_length (tree_vec, phis_to_rewrite); i <= idx; i++)
- VEC_quick_push (tree_vec, phis_to_rewrite, NULL);
+ VEC_reserve (gimple_vec, heap, phis_to_rewrite, last_basic_block + 1);
+ for (i = VEC_length (gimple_vec, phis_to_rewrite); i <= idx; i++)
+ VEC_quick_push (gimple_vec, phis_to_rewrite, NULL);
- phis = VEC_index (tree_vec, phis_to_rewrite, idx);
+ phis = VEC_index (gimple_vec, phis_to_rewrite, idx);
if (!phis)
- phis = VEC_alloc (tree, heap, 10);
+ phis = VEC_alloc (gimple, heap, 10);
- VEC_safe_push (tree, heap, phis, phi);
- VEC_replace (tree_vec, phis_to_rewrite, idx, phis);
+ VEC_safe_push (gimple, heap, phis, phi);
+ VEC_replace (gimple_vec, phis_to_rewrite, idx, phis);
}
{
unsigned bb_index;
edge e;
- tree phi;
+ gimple phi;
basic_block bb;
bitmap_iterator bi;
struct def_blocks_d *def_map;
if (update_p)
mark_block_for_update (bb);
- phi = NULL_TREE;
+ phi = NULL;
if (TREE_CODE (var) == SSA_NAME)
{
phi = create_phi_node (var, bb);
new_lhs = duplicate_ssa_name (var, phi);
- SET_PHI_RESULT (phi, new_lhs);
+ gimple_phi_set_result (phi, new_lhs);
add_new_name_mapping (new_lhs, var);
/* Add VAR to every argument slot of PHI. We need VAR in
}
else
{
- tree sym = DECL_P (var) ? var : SSA_NAME_VAR (var);
- phi = create_phi_node (sym, bb);
+ gcc_assert (DECL_P (var));
+ phi = create_phi_node (var, bb);
}
/* Mark this PHI node as interesting for update_ssa. */
- REGISTER_DEFS_IN_THIS_STMT (phi) = 1;
+ set_register_defs (phi, true);
mark_phi_for_rewrite (bb, phi);
}
}
rewrite_initialize_block (struct dom_walk_data *walk_data ATTRIBUTE_UNUSED,
basic_block bb)
{
- tree phi;
+ gimple phi;
+ gimple_stmt_iterator gsi;
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "\n\nRenaming block #%d\n\n", bb->index);
/* Step 1. Register new definitions for every PHI node in the block.
Conceptually, all the PHI nodes are executed in parallel and each PHI
node introduces a new version for the associated variable. */
- for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
+ for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
- tree result = PHI_RESULT (phi);
+ tree result;
+
+ phi = gsi_stmt (gsi);
+ result = gimple_phi_result (phi);
gcc_assert (is_gimple_reg (result));
register_new_def (result, SSA_NAME_VAR (result));
}
static void
rewrite_stmt (struct dom_walk_data *walk_data ATTRIBUTE_UNUSED,
- basic_block bb ATTRIBUTE_UNUSED, block_stmt_iterator si)
+ basic_block bb ATTRIBUTE_UNUSED, gimple_stmt_iterator si)
{
- tree stmt;
+ gimple stmt;
use_operand_p use_p;
def_operand_p def_p;
ssa_op_iter iter;
- stmt = bsi_stmt (si);
+ stmt = gsi_stmt (si);
/* If mark_def_sites decided that we don't need to rewrite this
statement, ignore it. */
gcc_assert (blocks_to_update == NULL);
- if (!REWRITE_THIS_STMT (stmt) && !REGISTER_DEFS_IN_THIS_STMT (stmt))
+ if (!rewrite_uses_p (stmt) && !register_defs_p (stmt))
return;
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file, "Renaming statement ");
- print_generic_stmt (dump_file, stmt, TDF_SLIM);
+ print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM);
fprintf (dump_file, "\n");
}
/* Step 1. Rewrite USES in the statement. */
- if (REWRITE_THIS_STMT (stmt))
+ if (rewrite_uses_p (stmt))
FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_USE)
{
tree var = USE_FROM_PTR (use_p);
}
/* Step 2. Register the statement's DEF operands. */
- if (REGISTER_DEFS_IN_THIS_STMT (stmt))
+ if (register_defs_p (stmt))
FOR_EACH_SSA_DEF_OPERAND (def_p, stmt, iter, SSA_OP_DEF)
{
tree var = DEF_FROM_PTR (def_p);
FOR_EACH_EDGE (e, ei, bb->succs)
{
- tree phi;
+ gimple phi;
+ gimple_stmt_iterator gsi;
- for (phi = phi_nodes (e->dest); phi; phi = PHI_CHAIN (phi))
+ for (gsi = gsi_start_phis (e->dest); !gsi_end_p (gsi);
+ gsi_next (&gsi))
{
tree currdef;
- currdef = get_reaching_def (SSA_NAME_VAR (PHI_RESULT (phi)));
+ phi = gsi_stmt (gsi);
+ currdef = get_reaching_def (SSA_NAME_VAR (gimple_phi_result (phi)));
add_phi_arg (phi, currdef, e);
}
}
fprintf (file, " ");
}
- fprintf (file, "}\n");
+ fprintf (file, "}");
}
else
- fprintf (file, "NIL\n");
+ fprintf (file, "NIL");
}
debug_decl_set (bitmap set)
{
dump_decl_set (stderr, set);
+ fprintf (stderr, "\n");
}
fprintf (file, "\n\nCurrent reaching definitions\n\n");
FOR_EACH_REFERENCED_VAR (var, i)
- if (syms_to_rename == NULL || bitmap_bit_p (syms_to_rename, DECL_UID (var)))
+ if (SYMS_TO_RENAME (cfun) == NULL
+ || bitmap_bit_p (SYMS_TO_RENAME (cfun), DECL_UID (var)))
{
fprintf (file, "CURRDEF (");
print_generic_expr (file, var, 0);
{
edge e;
edge_iterator ei;
- tree phi;
bool is_abnormal_phi;
+ gimple_stmt_iterator gsi;
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "\n\nRegistering new PHI nodes in block #%d\n\n",
register it as a new definition for its corresponding name. Also
register definitions for names whose underlying symbols are
marked for renaming. */
- for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
+ for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
tree lhs, lhs_sym;
+ gimple phi = gsi_stmt (gsi);
- if (!REGISTER_DEFS_IN_THIS_STMT (phi))
+ if (!register_defs_p (phi))
continue;
- lhs = PHI_RESULT (phi);
+ lhs = gimple_phi_result (phi);
lhs_sym = SSA_NAME_VAR (lhs);
if (symbol_marked_for_renaming (lhs_sym))
DEF_P. */
static inline void
-maybe_register_def (def_operand_p def_p, tree stmt)
+maybe_register_def (def_operand_p def_p, gimple stmt)
{
tree def = DEF_FROM_PTR (def_p);
tree sym = DECL_P (def) ? def : SSA_NAME_VAR (def);
static void
rewrite_update_stmt (struct dom_walk_data *walk_data ATTRIBUTE_UNUSED,
basic_block bb ATTRIBUTE_UNUSED,
- block_stmt_iterator si)
+ gimple_stmt_iterator si)
{
- stmt_ann_t ann;
- tree stmt;
+ gimple stmt;
use_operand_p use_p;
def_operand_p def_p;
ssa_op_iter iter;
- stmt = bsi_stmt (si);
- ann = stmt_ann (stmt);
+ stmt = gsi_stmt (si);
gcc_assert (bitmap_bit_p (blocks_to_update, bb->index));
/* Only update marked statements. */
- if (!REWRITE_THIS_STMT (stmt) && !REGISTER_DEFS_IN_THIS_STMT (stmt))
+ if (!rewrite_uses_p (stmt) && !register_defs_p (stmt))
return;
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file, "Updating SSA information for statement ");
- print_generic_stmt (dump_file, stmt, TDF_SLIM);
+ print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM);
fprintf (dump_file, "\n");
}
/* Rewrite USES included in OLD_SSA_NAMES and USES whose underlying
symbol is marked for renaming. */
- if (REWRITE_THIS_STMT (stmt))
- {
- FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_USE)
- maybe_replace_use (use_p);
-
- if (need_to_update_vops_p)
- FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_VIRTUAL_USES)
- maybe_replace_use (use_p);
- }
+ if (rewrite_uses_p (stmt))
+ FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_ALL_USES)
+ maybe_replace_use (use_p);
/* Register definitions of names in NEW_SSA_NAMES and OLD_SSA_NAMES.
Also register definitions for names whose underlying symbol is
marked for renaming. */
- if (REGISTER_DEFS_IN_THIS_STMT (stmt))
- {
- FOR_EACH_SSA_DEF_OPERAND (def_p, stmt, iter, SSA_OP_DEF)
- maybe_register_def (def_p, stmt);
-
- if (need_to_update_vops_p)
- FOR_EACH_SSA_DEF_OPERAND (def_p, stmt, iter, SSA_OP_VIRTUAL_DEFS)
- maybe_register_def (def_p, stmt);
- }
+ if (register_defs_p (stmt))
+ FOR_EACH_SSA_DEF_OPERAND (def_p, stmt, iter, SSA_OP_ALL_DEFS)
+ maybe_register_def (def_p, stmt);
}
FOR_EACH_EDGE (e, ei, bb->succs)
{
- tree phi;
- tree_vec phis;
+ gimple phi;
+ gimple_vec phis;
if (!bitmap_bit_p (blocks_with_phis_to_rewrite, e->dest->index))
continue;
- phis = VEC_index (tree_vec, phis_to_rewrite, e->dest->index);
- for (i = 0; VEC_iterate (tree, phis, i, phi); i++)
+ phis = VEC_index (gimple_vec, phis_to_rewrite, e->dest->index);
+ for (i = 0; VEC_iterate (gimple, phis, i, phi); i++)
{
tree arg, lhs_sym;
use_operand_p arg_p;
- gcc_assert (REWRITE_THIS_STMT (phi));
+ gcc_assert (rewrite_uses_p (phi));
arg_p = PHI_ARG_DEF_PTR_FROM_EDGE (phi, e);
arg = USE_FROM_PTR (arg_p);
if (arg && !DECL_P (arg) && TREE_CODE (arg) != SSA_NAME)
continue;
- lhs_sym = SSA_NAME_VAR (PHI_RESULT (phi));
+ lhs_sym = SSA_NAME_VAR (gimple_phi_result (phi));
if (arg == NULL_TREE)
{
cfun->gimple_df->in_ssa_p = true;
}
-
/* Main entry point into the SSA builder. The renaming process
proceeds in four main phases:
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
- 0, /* tv_id */
+ TV_NONE, /* tv_id */
PROP_cfg | PROP_referenced_vars, /* properties_required */
PROP_ssa, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
TODO_dump_func
+ | TODO_update_ssa_only_virtuals
| TODO_verify_ssa
| TODO_remove_unused_locals /* todo_flags_finish */
}
renamer. BLOCKS is the set of blocks that need updating. */
static void
-mark_def_interesting (tree var, tree stmt, basic_block bb, bool insert_phi_p)
+mark_def_interesting (tree var, gimple stmt, basic_block bb, bool insert_phi_p)
{
gcc_assert (bitmap_bit_p (blocks_to_update, bb->index));
- REGISTER_DEFS_IN_THIS_STMT (stmt) = 1;
+ set_register_defs (stmt, true);
if (insert_phi_p)
{
- bool is_phi_p = TREE_CODE (stmt) == PHI_NODE;
+ bool is_phi_p = gimple_code (stmt) == GIMPLE_PHI;
set_def_block (var, bb, is_phi_p);
nodes. */
static inline void
-mark_use_interesting (tree var, tree stmt, basic_block bb, bool insert_phi_p)
+mark_use_interesting (tree var, gimple stmt, basic_block bb, bool insert_phi_p)
{
- basic_block def_bb = bb_for_stmt (stmt);
+ basic_block def_bb = gimple_bb (stmt);
mark_block_for_update (def_bb);
mark_block_for_update (bb);
- if (TREE_CODE (stmt) == PHI_NODE)
+ if (gimple_code (stmt) == GIMPLE_PHI)
mark_phi_for_rewrite (def_bb, stmt);
else
- REWRITE_THIS_STMT (stmt) = 1;
+ set_rewrite_uses (stmt, true);
/* If VAR has not been defined in BB, then it is live-on-entry
to BB. Note that we cannot just use the block holding VAR's
prepare_block_for_update (basic_block bb, bool insert_phi_p)
{
basic_block son;
- block_stmt_iterator si;
- tree phi;
+ gimple_stmt_iterator si;
edge e;
edge_iterator ei;
/* Process PHI nodes marking interesting those that define or use
the symbols that we are interested in. */
- for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
+ for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
{
- tree lhs_sym, lhs = PHI_RESULT (phi);
+ gimple phi = gsi_stmt (si);
+ tree lhs_sym, lhs = gimple_phi_result (phi);
lhs_sym = DECL_P (lhs) ? lhs : SSA_NAME_VAR (lhs);
if (!symbol_marked_for_renaming (lhs_sym))
continue;
+
mark_def_interesting (lhs_sym, phi, bb, insert_phi_p);
/* Mark the uses in phi nodes as interesting. It would be more correct
block that also contains its definition, and thus insert a few more
phi nodes for it. */
FOR_EACH_EDGE (e, ei, bb->preds)
- {
- mark_use_interesting (lhs_sym, phi, e->src, insert_phi_p);
- }
+ mark_use_interesting (lhs_sym, phi, e->src, insert_phi_p);
}
/* Process the statements. */
- for (si = bsi_start (bb); !bsi_end_p (si); bsi_next (&si))
+ for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
{
- tree stmt;
+ gimple stmt;
ssa_op_iter i;
use_operand_p use_p;
def_operand_p def_p;
- stmt = bsi_stmt (si);
+ stmt = gsi_stmt (si);
FOR_EACH_SSA_USE_OPERAND (use_p, stmt, i, SSA_OP_ALL_USES)
{
FOR_EACH_IMM_USE_FAST (use_p, iter, name)
{
- tree stmt = USE_STMT (use_p);
- basic_block bb = bb_for_stmt (stmt);
+ gimple stmt = USE_STMT (use_p);
+ basic_block bb = gimple_bb (stmt);
- if (TREE_CODE (stmt) == PHI_NODE)
+ if (gimple_code (stmt) == GIMPLE_PHI)
{
int ix = PHI_ARG_INDEX_FROM_USE (use_p);
- edge e = PHI_ARG_EDGE (stmt, ix);
+ edge e = gimple_phi_arg_edge (stmt, ix);
mark_use_interesting (name, stmt, e->src, insert_phi_p);
}
else
static void
prepare_def_site_for (tree name, bool insert_phi_p)
{
- tree stmt;
+ gimple stmt;
basic_block bb;
gcc_assert (names_to_release == NULL
|| !bitmap_bit_p (names_to_release, SSA_NAME_VERSION (name)));
stmt = SSA_NAME_DEF_STMT (name);
- bb = bb_for_stmt (stmt);
+ bb = gimple_bb (stmt);
if (bb)
{
gcc_assert (bb->index < last_basic_block);
unsigned i = 0;
bitmap_iterator bi;
- if (!need_ssa_update_p ())
+ if (!need_ssa_update_p (cfun))
return;
if (new_ssa_names && sbitmap_first_set_bit (new_ssa_names) >= 0)
update_ssa_stats.num_virtual_symbols);
}
- if (syms_to_rename && !bitmap_empty_p (syms_to_rename))
+ if (!bitmap_empty_p (SYMS_TO_RENAME (cfun)))
{
fprintf (file, "\n\nSymbols to be put in SSA form\n\n");
- dump_decl_set (file, syms_to_rename);
+ dump_decl_set (file, SYMS_TO_RENAME (cfun));
+ fprintf (file, "\n");
}
if (names_to_release && !bitmap_empty_p (names_to_release))
/* Initialize data structures used for incremental SSA updates. */
static void
-init_update_ssa (void)
+init_update_ssa (struct function *fn)
{
/* Reserve more space than the current number of names. The calls to
add_new_name_mapping are typically done after creating new SSA
sbitmap_zero (new_ssa_names);
repl_tbl = htab_create (20, repl_map_hash, repl_map_eq, repl_map_free);
- need_to_initialize_update_ssa_p = false;
- need_to_update_vops_p = false;
- syms_to_rename = BITMAP_ALLOC (NULL);
- regs_to_rename = BITMAP_ALLOC (NULL);
- mem_syms_to_rename = BITMAP_ALLOC (NULL);
names_to_release = NULL;
memset (&update_ssa_stats, 0, sizeof (update_ssa_stats));
update_ssa_stats.virtual_symbols = BITMAP_ALLOC (NULL);
+ update_ssa_initialized_fn = fn;
}
htab_delete (repl_tbl);
repl_tbl = NULL;
- need_to_initialize_update_ssa_p = true;
- need_to_update_vops_p = false;
- BITMAP_FREE (syms_to_rename);
- BITMAP_FREE (regs_to_rename);
- BITMAP_FREE (mem_syms_to_rename);
+ bitmap_clear (SYMS_TO_RENAME (update_ssa_initialized_fn));
BITMAP_FREE (update_ssa_stats.virtual_symbols);
if (names_to_release)
if (blocks_with_phis_to_rewrite)
EXECUTE_IF_SET_IN_BITMAP (blocks_with_phis_to_rewrite, 0, i, bi)
{
- tree_vec phis = VEC_index (tree_vec, phis_to_rewrite, i);
+ gimple_vec phis = VEC_index (gimple_vec, phis_to_rewrite, i);
- VEC_free (tree, heap, phis);
- VEC_replace (tree_vec, phis_to_rewrite, i, NULL);
+ VEC_free (gimple, heap, phis);
+ VEC_replace (gimple_vec, phis_to_rewrite, i, NULL);
}
BITMAP_FREE (blocks_with_phis_to_rewrite);
BITMAP_FREE (blocks_to_update);
+ update_ssa_initialized_fn = NULL;
}
update_ssa's tables. */
tree
-create_new_def_for (tree old_name, tree stmt, def_operand_p def)
+create_new_def_for (tree old_name, gimple stmt, def_operand_p def)
{
tree new_name = duplicate_ssa_name (old_name, stmt);
SET_DEF (def, new_name);
- if (TREE_CODE (stmt) == PHI_NODE)
+ if (gimple_code (stmt) == GIMPLE_PHI)
{
edge e;
edge_iterator ei;
- basic_block bb = bb_for_stmt (stmt);
+ basic_block bb = gimple_bb (stmt);
/* If needed, mark NEW_NAME as occurring in an abnormal PHI node. */
FOR_EACH_EDGE (e, ei, bb->preds)
update_ssa. */
void
-register_new_name_mapping (tree new, tree old)
+register_new_name_mapping (tree new_tree, tree old)
{
- if (need_to_initialize_update_ssa_p)
- init_update_ssa ();
+ if (!update_ssa_initialized_fn)
+ init_update_ssa (cfun);
+
+ gcc_assert (update_ssa_initialized_fn == cfun);
- add_new_name_mapping (new, old);
+ add_new_name_mapping (new_tree, old);
}
void
mark_sym_for_renaming (tree sym)
{
- if (need_to_initialize_update_ssa_p)
- init_update_ssa ();
-
- /* FIXME. Why do we need this? */
- {
- subvar_t svars;
- if (var_can_have_subvars (sym) && (svars = get_subvars_for_var (sym)))
- {
- unsigned int i;
- tree subvar;
-
- for (i = 0; VEC_iterate (tree, svars, i, subvar); ++i)
- mark_sym_for_renaming (subvar);
- }
- }
-
- bitmap_set_bit (syms_to_rename, DECL_UID (sym));
-
- if (!is_gimple_reg (sym))
- {
- need_to_update_vops_p = true;
- if (memory_partition (sym))
- bitmap_set_bit (syms_to_rename, DECL_UID (memory_partition (sym)));
- }
+ bitmap_set_bit (SYMS_TO_RENAME (cfun), DECL_UID (sym));
}
if (set == NULL || bitmap_empty_p (set))
return;
- if (need_to_initialize_update_ssa_p)
- init_update_ssa ();
-
EXECUTE_IF_SET_IN_BITMAP (set, 0, i, bi)
mark_sym_for_renaming (referenced_var (i));
}
-/* Return true if there is any work to be done by update_ssa. */
+/* Return true if there is any work to be done by update_ssa
+ for function FN. */
bool
-need_ssa_update_p (void)
+need_ssa_update_p (struct function *fn)
{
- return syms_to_rename || old_ssa_names || new_ssa_names;
+ gcc_assert (fn != NULL);
+ return (update_ssa_initialized_fn == fn
+ || (fn->gimple_df
+ && !bitmap_empty_p (SYMS_TO_RENAME (fn))));
}
/* Return true if SSA name mappings have been registered for SSA updating. */
bool
name_mappings_registered_p (void)
{
+ if (!update_ssa_initialized_fn)
+ return false;
+
+ gcc_assert (update_ssa_initialized_fn == cfun);
+
return repl_tbl && htab_elements (repl_tbl) > 0;
}
/* Return true if name N has been registered in the replacement table. */
bool
-name_registered_for_update_p (tree n)
+name_registered_for_update_p (tree n ATTRIBUTE_UNUSED)
{
- if (!need_ssa_update_p ())
+ if (!update_ssa_initialized_fn)
return false;
- return is_new_name (n)
- || is_old_name (n)
- || symbol_marked_for_renaming (SSA_NAME_VAR (n));
+ gcc_assert (update_ssa_initialized_fn == cfun);
+
+ return is_new_name (n) || is_old_name (n);
}
bitmap ret;
sbitmap_iterator sbi;
+ gcc_assert (update_ssa_initialized_fn == NULL
+ || update_ssa_initialized_fn == cfun);
+
ret = BITMAP_ALLOC (NULL);
EXECUTE_IF_SET_IN_SBITMAP (old_ssa_names, 0, i, sbi)
bitmap_set_bit (ret, i);
void
release_ssa_name_after_update_ssa (tree name)
{
- gcc_assert (!need_to_initialize_update_ssa_p);
+ gcc_assert (cfun && update_ssa_initialized_fn == cfun);
if (names_to_release == NULL)
names_to_release = BITMAP_ALLOC (NULL);
bool insert_phi_p;
sbitmap_iterator sbi;
- if (!need_ssa_update_p ())
+ if (!need_ssa_update_p (cfun))
return;
timevar_push (TV_TREE_SSA_INCREMENTAL);
+ if (!update_ssa_initialized_fn)
+ init_update_ssa (cfun);
+ gcc_assert (update_ssa_initialized_fn == cfun);
+
blocks_with_phis_to_rewrite = BITMAP_ALLOC (NULL);
if (!phis_to_rewrite)
- phis_to_rewrite = VEC_alloc (tree_vec, heap, last_basic_block);
+ phis_to_rewrite = VEC_alloc (gimple_vec, heap, last_basic_block);
blocks_to_update = BITMAP_ALLOC (NULL);
/* Ensure that the dominance information is up-to-date. */
if (insert_phi_p && switch_virtuals_to_full_rewrite_p ())
switch_virtuals_to_full_rewrite ();
- /* If there are symbols to rename, identify those symbols that are
- GIMPLE registers into the set REGS_TO_RENAME and those that are
- memory symbols into the set MEM_SYMS_TO_RENAME. */
- if (!bitmap_empty_p (syms_to_rename))
- {
- unsigned i;
- bitmap_iterator bi;
-
- EXECUTE_IF_SET_IN_BITMAP (syms_to_rename, 0, i, bi)
- {
- tree sym = referenced_var (i);
- if (is_gimple_reg (sym))
- bitmap_set_bit (regs_to_rename, i);
- else
- {
- /* Memory partitioning information may have been
- computed after the symbol was marked for renaming,
- if SYM is inside a partition also mark the partition
- for renaming. */
- tree mpt = memory_partition (sym);
- if (mpt)
- bitmap_set_bit (syms_to_rename, DECL_UID (mpt));
- }
- }
-
- /* Memory symbols are those not in REGS_TO_RENAME. */
- bitmap_and_compl (mem_syms_to_rename, syms_to_rename, regs_to_rename);
- }
-
/* If there are names defined in the replacement table, prepare
definition and use sites for all the names in NEW_SSA_NAMES and
OLD_SSA_NAMES. */
removal, and there are no symbols to rename, then there's
nothing else to do. */
if (sbitmap_first_set_bit (new_ssa_names) < 0
- && bitmap_empty_p (syms_to_rename))
+ && bitmap_empty_p (SYMS_TO_RENAME (cfun)))
goto done;
}
/* Next, determine the block at which to start the renaming process. */
- if (!bitmap_empty_p (syms_to_rename))
+ if (!bitmap_empty_p (SYMS_TO_RENAME (cfun)))
{
/* If we have to rename some symbols from scratch, we need to
start the process at the root of the CFG. FIXME, it should
sbitmap_free (tmp);
}
- EXECUTE_IF_SET_IN_BITMAP (syms_to_rename, 0, i, bi)
+ EXECUTE_IF_SET_IN_BITMAP (SYMS_TO_RENAME (cfun), 0, i, bi)
insert_updated_phi_nodes_for (referenced_var (i), dfs, blocks_to_update,
update_flags);
EXECUTE_IF_SET_IN_SBITMAP (old_ssa_names, 0, i, sbi)
set_current_def (ssa_name (i), NULL_TREE);
- EXECUTE_IF_SET_IN_BITMAP (syms_to_rename, 0, i, bi)
+ EXECUTE_IF_SET_IN_BITMAP (SYMS_TO_RENAME (cfun), 0, i, bi)
set_current_def (referenced_var (i), NULL_TREE);
/* Now start the renaming process at START_BB. */
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