/* SSA-PRE for trees.
- Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
Contributed by Daniel Berlin <dan@dberlin.org> and Steven Bosscher
<stevenb@suse.de>
#include "system.h"
#include "coretypes.h"
#include "tm.h"
-#include "ggc.h"
#include "tree.h"
#include "basic-block.h"
#include "diagnostic.h"
+#include "tree-pretty-print.h"
+#include "gimple-pretty-print.h"
#include "tree-inline.h"
#include "tree-flow.h"
#include "gimple.h"
#include "fibheap.h"
#include "hashtab.h"
#include "tree-iterator.h"
-#include "real.h"
#include "alloc-pool.h"
#include "obstack.h"
#include "tree-pass.h"
case REFERENCE:
{
vn_reference_t ref = PRE_EXPR_REFERENCE (e);
- VEC (vn_reference_op_s, heap) *operands = ref->operands;
- vn_reference_op_t op;
-
- /* Try to simplify the translated expression if it is
- a call to a builtin function with at most two arguments. */
- op = VEC_index (vn_reference_op_s, operands, 0);
- if (op->opcode == CALL_EXPR
- && TREE_CODE (op->op0) == ADDR_EXPR
- && TREE_CODE (TREE_OPERAND (op->op0, 0)) == FUNCTION_DECL
- && DECL_BUILT_IN (TREE_OPERAND (op->op0, 0))
- && VEC_length (vn_reference_op_s, operands) >= 2
- && VEC_length (vn_reference_op_s, operands) <= 3)
- {
- vn_reference_op_t arg0, arg1 = NULL;
- bool anyconst = false;
- arg0 = VEC_index (vn_reference_op_s, operands, 1);
- if (VEC_length (vn_reference_op_s, operands) > 2)
- arg1 = VEC_index (vn_reference_op_s, operands, 2);
- if (TREE_CODE_CLASS (arg0->opcode) == tcc_constant
- || (arg0->opcode == ADDR_EXPR
- && is_gimple_min_invariant (arg0->op0)))
- anyconst = true;
- if (arg1
- && (TREE_CODE_CLASS (arg1->opcode) == tcc_constant
- || (arg1->opcode == ADDR_EXPR
- && is_gimple_min_invariant (arg1->op0))))
- anyconst = true;
- if (anyconst)
- {
- tree folded = build_call_expr (TREE_OPERAND (op->op0, 0),
- arg1 ? 2 : 1,
- arg0->op0,
- arg1 ? arg1->op0 : NULL);
- if (folded
- && TREE_CODE (folded) == NOP_EXPR)
- folded = TREE_OPERAND (folded, 0);
- if (folded
- && is_gimple_min_invariant (folded))
- return get_or_alloc_expr_for_constant (folded);
- }
- }
- return e;
- }
+ tree folded;
+ if ((folded = fully_constant_vn_reference_p (ref)))
+ return get_or_alloc_expr_for_constant (folded);
+ return e;
+ }
default:
return e;
}
that we will return. */
if (!pretemp || exprtype != TREE_TYPE (pretemp))
{
- pretemp = create_tmp_var (exprtype, "pretmp");
+ pretemp = create_tmp_reg (exprtype, "pretmp");
get_var_ann (pretemp);
}
+static pre_expr
+phi_translate (pre_expr expr, bitmap_set_t set1, bitmap_set_t set2,
+ basic_block pred, basic_block phiblock);
/* Translate EXPR using phis in PHIBLOCK, so that it has the values of
the phis in PRED. Return NULL if we can't find a leader for each part
of the translated expression. */
static pre_expr
-phi_translate (pre_expr expr, bitmap_set_t set1, bitmap_set_t set2,
- basic_block pred, basic_block phiblock)
+phi_translate_1 (pre_expr expr, bitmap_set_t set1, bitmap_set_t set2,
+ basic_block pred, basic_block phiblock)
{
- pre_expr oldexpr = expr;
- pre_expr phitrans;
-
- if (!expr)
- return NULL;
-
- /* Constants contain no values that need translation. */
- if (expr->kind == CONSTANT)
- return expr;
-
- if (value_id_constant_p (get_expr_value_id (expr)))
- return expr;
-
- phitrans = phi_trans_lookup (expr, pred);
- if (phitrans)
- return phitrans;
-
switch (expr->kind)
{
case NARY:
}
add_to_value (new_val_id, expr);
}
- phi_trans_add (oldexpr, expr, pred);
return expr;
}
break;
ref->type,
newoperands,
&newref, true);
- if (newref)
+ if (result)
VEC_free (vn_reference_op_s, heap, newoperands);
if (result && is_gimple_min_invariant (result))
add_to_value (new_val_id, expr);
}
VEC_free (vn_reference_op_s, heap, newoperands);
- phi_trans_add (oldexpr, expr, pred);
return expr;
}
break;
}
}
+/* Wrapper around phi_translate_1 providing caching functionality. */
+
+static pre_expr
+phi_translate (pre_expr expr, bitmap_set_t set1, bitmap_set_t set2,
+ basic_block pred, basic_block phiblock)
+{
+ pre_expr phitrans;
+
+ if (!expr)
+ return NULL;
+
+ /* Constants contain no values that need translation. */
+ if (expr->kind == CONSTANT)
+ return expr;
+
+ if (value_id_constant_p (get_expr_value_id (expr)))
+ return expr;
+
+ if (expr->kind != NAME)
+ {
+ phitrans = phi_trans_lookup (expr, pred);
+ if (phitrans)
+ return phitrans;
+ }
+
+ /* Translate. */
+ phitrans = phi_translate_1 (expr, set1, set2, pred, phiblock);
+
+ /* Don't add empty translations to the cache. Neither add
+ translations of NAMEs as those are cheap to translate. */
+ if (phitrans
+ && expr->kind != NAME)
+ phi_trans_add (expr, phitrans, pred);
+
+ return phitrans;
+}
+
+
/* For each expression in SET, translate the values through phi nodes
in PHIBLOCK using edge PHIBLOCK->PRED, and store the resulting
expressions in DEST. */
{
pre_expr translated;
translated = phi_translate (expr, set, NULL, pred, phiblock);
-
- /* Don't add empty translations to the cache */
if (!translated)
continue;
- phi_trans_add (expr, translated, pred);
-
/* We might end up with multiple expressions from SET being
translated to the same value. In this case we do not want
to retain the NARY or REFERENCE expression but prefer a NAME
/* Inserted expressions are placed onto this worklist, which is used
for performing quick dead code elimination of insertions we made
that didn't turn out to be necessary. */
-static VEC(gimple,heap) *inserted_exprs;
-static bitmap inserted_phi_names;
+static bitmap inserted_exprs;
/* Pool allocated fake store expressions are placed onto this
worklist, which, after performing dead code elimination, is walked
{
case CALL_EXPR:
{
- tree folded, sc = currop->op1;
+ tree folded, sc = NULL_TREE;
unsigned int nargs = 0;
- tree *args = XNEWVEC (tree, VEC_length (vn_reference_op_s,
- ref->operands) - 1);
+ tree fn, *args;
+ if (TREE_CODE (currop->op0) == FUNCTION_DECL)
+ fn = currop->op0;
+ else
+ {
+ pre_expr op0 = get_or_alloc_expr_for (currop->op0);
+ fn = find_or_generate_expression (block, op0, stmts, domstmt);
+ if (!fn)
+ return NULL_TREE;
+ }
+ if (currop->op1)
+ {
+ pre_expr scexpr = get_or_alloc_expr_for (currop->op1);
+ sc = find_or_generate_expression (block, scexpr, stmts, domstmt);
+ if (!sc)
+ return NULL_TREE;
+ }
+ args = XNEWVEC (tree, VEC_length (vn_reference_op_s,
+ ref->operands) - 1);
while (*operand < VEC_length (vn_reference_op_s, ref->operands))
{
args[nargs] = create_component_ref_by_pieces_1 (block, ref,
operand, stmts,
domstmt);
+ if (!args[nargs])
+ {
+ free (args);
+ return NULL_TREE;
+ }
nargs++;
}
folded = build_call_array (currop->type,
- TREE_CODE (currop->op0) == FUNCTION_DECL
- ? build_fold_addr_expr (currop->op0)
- : currop->op0,
+ (TREE_CODE (fn) == FUNCTION_DECL
+ ? build_fold_addr_expr (fn) : fn),
nargs, args);
free (args);
if (sc)
- {
- pre_expr scexpr = get_or_alloc_expr_for (sc);
- sc = find_or_generate_expression (block, scexpr, stmts, domstmt);
- if (!sc)
- return NULL_TREE;
- CALL_EXPR_STATIC_CHAIN (folded) = sc;
- }
+ CALL_EXPR_STATIC_CHAIN (folded) = sc;
return folded;
}
break;
return NULL_TREE;
if (genop2)
{
- op2expr = get_or_alloc_expr_for (genop2);
- genop2 = find_or_generate_expression (block, op2expr, stmts,
- domstmt);
- if (!genop2)
- return NULL_TREE;
+ /* Drop zero minimum index. */
+ if (tree_int_cst_equal (genop2, integer_zero_node))
+ genop2 = NULL_TREE;
+ else
+ {
+ op2expr = get_or_alloc_expr_for (genop2);
+ genop2 = find_or_generate_expression (block, op2expr, stmts,
+ domstmt);
+ if (!genop2)
+ return NULL_TREE;
+ }
}
if (genop3)
{
tree elmt_type = TREE_TYPE (TREE_TYPE (genop0));
- genop3 = size_binop (EXACT_DIV_EXPR, genop3,
- size_int (TYPE_ALIGN_UNIT (elmt_type)));
- op3expr = get_or_alloc_expr_for (genop3);
- genop3 = find_or_generate_expression (block, op3expr, stmts,
- domstmt);
- if (!genop3)
- return NULL_TREE;
+ /* We can't always put a size in units of the element alignment
+ here as the element alignment may be not visible. See
+ PR43783. Simply drop the element size for constant
+ sizes. */
+ if (tree_int_cst_equal (genop3, TYPE_SIZE_UNIT (elmt_type)))
+ genop3 = NULL_TREE;
+ else
+ {
+ genop3 = size_binop (EXACT_DIV_EXPR, genop3,
+ size_int (TYPE_ALIGN_UNIT (elmt_type)));
+ op3expr = get_or_alloc_expr_for (genop3);
+ genop3 = find_or_generate_expression (block, op3expr, stmts,
+ domstmt);
+ if (!genop3)
+ return NULL_TREE;
+ }
}
return build4 (currop->opcode, currop->type, genop0, genop1,
genop2, genop3);
tree forcedname = gimple_get_lhs (stmt);
pre_expr nameexpr;
- VEC_safe_push (gimple, heap, inserted_exprs, stmt);
if (TREE_CODE (forcedname) == SSA_NAME)
{
+ bitmap_set_bit (inserted_exprs, SSA_NAME_VERSION (forcedname));
VN_INFO_GET (forcedname)->valnum = forcedname;
VN_INFO (forcedname)->value_id = get_next_value_id ();
nameexpr = get_or_alloc_expr_for_name (forcedname);
that we will return. */
if (!pretemp || exprtype != TREE_TYPE (pretemp))
{
- pretemp = create_tmp_var (exprtype, "pretmp");
+ pretemp = create_tmp_reg (exprtype, "pretmp");
get_var_ann (pretemp);
}
temp = pretemp;
add_referenced_var (temp);
- if (TREE_CODE (exprtype) == COMPLEX_TYPE
- || TREE_CODE (exprtype) == VECTOR_TYPE)
- DECL_GIMPLE_REG_P (temp) = 1;
-
newstmt = gimple_build_assign (temp, folded);
name = make_ssa_name (temp, newstmt);
gimple_assign_set_lhs (newstmt, name);
gimple_set_plf (newstmt, NECESSARY, false);
gimple_seq_add_stmt (stmts, newstmt);
- VEC_safe_push (gimple, heap, inserted_exprs, newstmt);
+ bitmap_set_bit (inserted_exprs, SSA_NAME_VERSION (name));
/* All the symbols in NEWEXPR should be put into SSA form. */
mark_symbols_for_renaming (newstmt);
for (; !gsi_end_p (gsi); gsi_next (&gsi))
{
gimple stmt = gsi_stmt (gsi);
- VEC_safe_push (gimple, heap, inserted_exprs, stmt);
+ tree lhs = gimple_get_lhs (stmt);
+ if (TREE_CODE (lhs) == SSA_NAME)
+ bitmap_set_bit (inserted_exprs,
+ SSA_NAME_VERSION (lhs));
gimple_set_plf (stmt, NECESSARY, false);
}
gsi_insert_seq_on_edge (pred, stmts);
for (; !gsi_end_p (gsi); gsi_next (&gsi))
{
gimple stmt = gsi_stmt (gsi);
- VEC_safe_push (gimple, heap, inserted_exprs, stmt);
+ tree lhs = gimple_get_lhs (stmt);
+ if (TREE_CODE (lhs) == SSA_NAME)
+ bitmap_set_bit (inserted_exprs, SSA_NAME_VERSION (lhs));
gimple_set_plf (stmt, NECESSARY, false);
}
gsi_insert_seq_on_edge (pred, stmts);
gimple_set_plf (phi, NECESSARY, false);
VN_INFO_GET (gimple_phi_result (phi))->valnum = gimple_phi_result (phi);
VN_INFO (gimple_phi_result (phi))->value_id = val;
- VEC_safe_push (gimple, heap, inserted_exprs, phi);
- bitmap_set_bit (inserted_phi_names,
- SSA_NAME_VERSION (gimple_phi_result (phi)));
+ bitmap_set_bit (inserted_exprs, SSA_NAME_VERSION (gimple_phi_result (phi)));
FOR_EACH_EDGE (pred, ei, block->preds)
{
pre_expr ae = avail[pred->src->index];
replacing the PHI with a single copy if possible.
Do not touch inserted, single-argument or virtual PHIs. */
if (gimple_phi_num_args (phi) == 1
- || !is_gimple_reg (res)
- || bitmap_bit_p (inserted_phi_names, SSA_NAME_VERSION (res)))
+ || !is_gimple_reg (res))
{
gsi_next (&gsi);
continue;
remove_phi_node (&gsi, false);
+ if (!bitmap_bit_p (inserted_exprs, SSA_NAME_VERSION (res))
+ && TREE_CODE (sprime) == SSA_NAME)
+ gimple_set_plf (SSA_NAME_DEF_STMT (sprime), NECESSARY, true);
+
if (!useless_type_conversion_p (TREE_TYPE (res), TREE_TYPE (sprime)))
sprime = fold_convert (TREE_TYPE (res), sprime);
stmt = gimple_build_assign (res, sprime);
SSA_NAME_DEF_STMT (res) = stmt;
- if (TREE_CODE (sprime) == SSA_NAME)
- gimple_set_plf (SSA_NAME_DEF_STMT (sprime),
- NECESSARY, true);
+ gimple_set_plf (stmt, NECESSARY, gimple_plf (phi, NECESSARY));
+
gsi2 = gsi_after_labels (b);
gsi_insert_before (&gsi2, stmt, GSI_NEW_STMT);
/* Queue the copy for eventual removal. */
VEC_safe_push (gimple, heap, to_remove, stmt);
- pre_stats.eliminations++;
+ /* If we inserted this PHI node ourself, it's not an elimination. */
+ if (bitmap_bit_p (inserted_exprs, SSA_NAME_VERSION (res)))
+ pre_stats.phis--;
+ else
+ pre_stats.eliminations++;
}
}
for (i = 0; VEC_iterate (gimple, to_remove, i, stmt); ++i)
{
tree lhs = gimple_assign_lhs (stmt);
+ tree rhs = gimple_assign_rhs1 (stmt);
use_operand_p use_p;
gimple use_stmt;
/* If there is a single use only, propagate the equivalency
instead of keeping the copy. */
if (TREE_CODE (lhs) == SSA_NAME
+ && TREE_CODE (rhs) == SSA_NAME
&& single_imm_use (lhs, &use_p, &use_stmt)
- && may_propagate_copy (USE_FROM_PTR (use_p),
- gimple_assign_rhs1 (stmt)))
+ && may_propagate_copy (USE_FROM_PTR (use_p), rhs))
{
- SET_USE (use_p, gimple_assign_rhs1 (stmt));
+ SET_USE (use_p, rhs);
update_stmt (use_stmt);
+ if (bitmap_bit_p (inserted_exprs, SSA_NAME_VERSION (lhs))
+ && TREE_CODE (rhs) == SSA_NAME)
+ gimple_set_plf (SSA_NAME_DEF_STMT (rhs), NECESSARY, true);
}
/* If this is a store or a now unused copy, remove it. */
gsi = gsi_for_stmt (stmt);
unlink_stmt_vdef (stmt);
gsi_remove (&gsi, true);
+ if (TREE_CODE (lhs) == SSA_NAME)
+ bitmap_clear_bit (inserted_exprs, SSA_NAME_VERSION (lhs));
release_defs (stmt);
}
}
static void
remove_dead_inserted_code (void)
{
- VEC(gimple,heap) *worklist = NULL;
- int i;
+ bitmap worklist;
+ unsigned i;
+ bitmap_iterator bi;
gimple t;
- worklist = VEC_alloc (gimple, heap, VEC_length (gimple, inserted_exprs));
- for (i = 0; VEC_iterate (gimple, inserted_exprs, i, t); i++)
+ worklist = BITMAP_ALLOC (NULL);
+ EXECUTE_IF_SET_IN_BITMAP (inserted_exprs, 0, i, bi)
{
+ t = SSA_NAME_DEF_STMT (ssa_name (i));
if (gimple_plf (t, NECESSARY))
- VEC_quick_push (gimple, worklist, t);
+ bitmap_set_bit (worklist, i);
}
- while (VEC_length (gimple, worklist) > 0)
+ while (!bitmap_empty_p (worklist))
{
- t = VEC_pop (gimple, worklist);
+ i = bitmap_first_set_bit (worklist);
+ bitmap_clear_bit (worklist, i);
+ t = SSA_NAME_DEF_STMT (ssa_name (i));
/* PHI nodes are somewhat special in that each PHI alternative has
data and control dependencies. All the statements feeding the
{
unsigned k;
- VEC_reserve (gimple, heap, worklist, gimple_phi_num_args (t));
for (k = 0; k < gimple_phi_num_args (t); k++)
{
tree arg = PHI_ARG_DEF (t, k);
{
gimple n = mark_operand_necessary (arg);
if (n)
- VEC_quick_push (gimple, worklist, n);
+ bitmap_set_bit (worklist, SSA_NAME_VERSION (arg));
}
}
}
{
gimple n = mark_operand_necessary (use);
if (n)
- VEC_safe_push (gimple, heap, worklist, n);
+ bitmap_set_bit (worklist, SSA_NAME_VERSION (use));
}
}
}
- for (i = 0; VEC_iterate (gimple, inserted_exprs, i, t); i++)
+ EXECUTE_IF_SET_IN_BITMAP (inserted_exprs, 0, i, bi)
{
+ t = SSA_NAME_DEF_STMT (ssa_name (i));
if (!gimple_plf (t, NECESSARY))
{
gimple_stmt_iterator gsi;
}
}
}
- VEC_free (gimple, heap, worklist);
+ BITMAP_FREE (worklist);
}
/* Compute a reverse post-order in *POST_ORDER. If INCLUDE_ENTRY_EXIT is
int sp;
int post_order_num = 0;
sbitmap visited;
- int count;
if (include_entry_exit)
post_order[post_order_num++] = EXIT_BLOCK;
}
if (include_entry_exit)
- {
- post_order[post_order_num++] = ENTRY_BLOCK;
- count = post_order_num;
- }
- else
- count = post_order_num + 2;
+ post_order[post_order_num++] = ENTRY_BLOCK;
free (stack);
sbitmap_free (visited);
in_fre = do_fre;
- inserted_exprs = NULL;
+ inserted_exprs = BITMAP_ALLOC (NULL);
need_creation = NULL;
pretemp = NULL_TREE;
storetemp = NULL_TREE;
calculate_dominance_info (CDI_DOMINATORS);
bitmap_obstack_initialize (&grand_bitmap_obstack);
- inserted_phi_names = BITMAP_ALLOC (&grand_bitmap_obstack);
phi_translate_table = htab_create (5110, expr_pred_trans_hash,
expr_pred_trans_eq, free);
expression_to_id = htab_create (num_ssa_names * 3,
free (postorder);
VEC_free (bitmap_set_t, heap, value_expressions);
- VEC_free (gimple, heap, inserted_exprs);
+ BITMAP_FREE (inserted_exprs);
VEC_free (gimple, heap, need_creation);
bitmap_obstack_release (&grand_bitmap_obstack);
free_alloc_pool (bitmap_set_pool);
if (!run_scc_vn (do_fre))
{
if (!do_fre)
- {
- remove_dead_inserted_code ();
- loop_optimizer_finalize ();
- }
+ loop_optimizer_finalize ();
return 0;
}
+
init_pre (do_fre);
scev_initialize ();
-
/* Collect and value number expressions computed in each basic block. */
compute_avail ();
insert ();
}
+ /* Make sure to remove fake edges before committing our inserts.
+ This makes sure we don't end up with extra critical edges that
+ we would need to split. */
+ remove_fake_exit_edges ();
+ gsi_commit_edge_inserts ();
+
/* Remove all the redundant expressions. */
todo |= eliminate ();
statistics_counter_event (cfun, "Eliminated", pre_stats.eliminations);
statistics_counter_event (cfun, "Constified", pre_stats.constified);
- /* Make sure to remove fake edges before committing our inserts.
- This makes sure we don't end up with extra critical edges that
- we would need to split. */
- remove_fake_exit_edges ();
- gsi_commit_edge_inserts ();
-
clear_expression_ids ();
free_scc_vn ();
if (!do_fre)
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