/* Translation of isl AST to Gimple.
- Copyright (C) 2014-2017 Free Software Foundation, Inc.
+ Copyright (C) 2014-2019 Free Software Foundation, Inc.
Contributed by Roman Gareev <gareevroman@gmail.com>.
This file is part of GCC.
#include "cfghooks.h"
#include "tree.h"
#include "gimple.h"
-#include "params.h"
+#include "ssa.h"
#include "fold-const.h"
#include "gimple-fold.h"
#include "gimple-iterator.h"
#include "gimple-pretty-print.h"
#include "cfganal.h"
#include "value-prof.h"
+#include "tree-ssa.h"
+#include "tree-vectorizer.h"
#include "graphite.h"
-/* We always try to use signed 128 bit types, but fall back to smaller types
- in case a platform does not provide types of these sizes. In the future we
- should use isl to derive the optimal type for each subexpression. */
-
-static int max_mode_int_precision =
- GET_MODE_PRECISION (mode_for_size (MAX_FIXED_MODE_SIZE, MODE_INT, 0));
-static int graphite_expression_type_precision = 128 <= max_mode_int_precision ?
- 128 : max_mode_int_precision;
-
struct ast_build_info
{
ast_build_info()
bool is_parallelizable;
};
-/* Converts a GMP constant VAL to a tree and returns it. */
-
-static tree
-gmp_cst_to_tree (tree type, mpz_t val)
-{
- tree t = type ? type : integer_type_node;
- mpz_t tmp;
-
- mpz_init (tmp);
- mpz_set (tmp, val);
- wide_int wi = wi::from_mpz (t, tmp, true);
- mpz_clear (tmp);
-
- return wide_int_to_tree (t, wi);
-}
-
-/* Verifies properties that GRAPHITE should maintain during translation. */
-
-static inline void
-graphite_verify (void)
-{
- checking_verify_loop_structure ();
- checking_verify_loop_closed_ssa (true);
-}
-
/* IVS_PARAMS maps isl's scattering and parameter identifiers
to corresponding trees. */
class translate_isl_ast_to_gimple
{
public:
- translate_isl_ast_to_gimple (sese_info_p r)
- : region (r), codegen_error (false) { }
+ translate_isl_ast_to_gimple (sese_info_p r);
edge translate_isl_ast (loop_p context_loop, __isl_keep isl_ast_node *node,
edge next_e, ivs_params &ip);
edge translate_isl_ast_node_for (loop_p context_loop,
tree gcc_expression_from_isl_ast_expr_id (tree type,
__isl_keep isl_ast_expr *expr_id,
ivs_params &ip);
+ widest_int widest_int_from_isl_expr_int (__isl_keep isl_ast_expr *expr);
tree gcc_expression_from_isl_expr_int (tree type,
__isl_take isl_ast_expr *expr);
tree gcc_expression_from_isl_expr_op (tree type,
__isl_keep isl_ast_node *node_for,
loop_p outer, tree type,
tree lb, tree ub, ivs_params &ip);
- edge graphite_create_new_loop_guard (edge entry_edge,
- __isl_keep isl_ast_node *node_for,
- tree *type,
- tree *lb, tree *ub, ivs_params &ip);
edge graphite_create_new_guard (edge entry_edge,
__isl_take isl_ast_expr *if_cond,
ivs_params &ip);
void build_iv_mapping (vec<tree> iv_map, gimple_poly_bb_p gbb,
__isl_keep isl_ast_expr *user_expr, ivs_params &ip,
sese_l ®ion);
- void translate_pending_phi_nodes (void);
void add_parameters_to_ivs_params (scop_p scop, ivs_params &ip);
__isl_give isl_ast_build *generate_isl_context (scop_p scop);
__isl_give isl_ast_node * scop_to_isl_ast (scop_p scop);
- bool is_valid_rename (tree rename, basic_block def_bb, basic_block use_bb,
- phi_node_kind, tree old_name, basic_block old_bb) const;
- tree get_rename (basic_block new_bb, tree old_name,
- basic_block old_bb, phi_node_kind) const;
tree get_rename_from_scev (tree old_name, gimple_seq *stmts, loop_p loop,
- basic_block new_bb, basic_block old_bb,
vec<tree> iv_map);
- basic_block get_def_bb_for_const (basic_block bb, basic_block old_bb) const;
- tree get_new_name (basic_block new_bb, tree op,
- basic_block old_bb, phi_node_kind) const;
- void collect_all_ssa_names (tree new_expr, vec<tree> *vec_ssa);
- bool copy_loop_phi_args (gphi *old_phi, init_back_edge_pair_t &ibp_old_bb,
- gphi *new_phi, init_back_edge_pair_t &ibp_new_bb,
- bool postpone);
- bool copy_loop_phi_nodes (basic_block bb, basic_block new_bb);
- bool add_close_phis_to_merge_points (gphi *old_phi, gphi *new_phi,
- tree default_value);
- tree add_close_phis_to_outer_loops (tree last_merge_name, edge merge_e,
- gimple *old_close_phi);
- bool copy_loop_close_phi_args (basic_block old_bb, basic_block new_bb,
- bool postpone);
- bool copy_loop_close_phi_nodes (basic_block old_bb, basic_block new_bb);
- bool copy_cond_phi_args (gphi *phi, gphi *new_phi, vec<tree> iv_map,
- bool postpone);
- bool copy_cond_phi_nodes (basic_block bb, basic_block new_bb,
- vec<tree> iv_map);
- bool graphite_copy_stmts_from_block (basic_block bb, basic_block new_bb,
+ void graphite_copy_stmts_from_block (basic_block bb, basic_block new_bb,
vec<tree> iv_map);
edge copy_bb_and_scalar_dependences (basic_block bb, edge next_e,
vec<tree> iv_map);
- edge edge_for_new_close_phis (basic_block bb);
- bool add_phi_arg_for_new_expr (tree old_phi_args[2], tree new_phi_args[2],
- edge old_bb_dominating_edge,
- edge old_bb_non_dominating_edge,
- gphi *phi, gphi *new_phi,
- basic_block new_bb);
- bool rename_uses (gimple *copy, gimple_stmt_iterator *gsi_tgt,
- basic_block old_bb, loop_p loop, vec<tree> iv_map);
void set_rename (tree old_name, tree expr);
- void set_rename_for_each_def (gimple *stmt);
void gsi_insert_earliest (gimple_seq seq);
- tree rename_all_uses (tree new_expr, basic_block new_bb, basic_block old_bb);
bool codegen_error_p () const { return codegen_error; }
+
+ void set_codegen_error ()
+ {
+ codegen_error = true;
+ gcc_assert (! flag_checking
+ || param_graphite_allow_codegen_errors);
+ }
+
bool is_constant (tree op) const
{
return TREE_CODE (op) == INTEGER_CST
/* A vector of all the edges at if_condition merge points. */
auto_vec<edge, 2> merge_points;
+
+ tree graphite_expr_type;
};
+translate_isl_ast_to_gimple::translate_isl_ast_to_gimple (sese_info_p r)
+ : region (r), codegen_error (false)
+{
+ /* We always try to use signed 128 bit types, but fall back to smaller types
+ in case a platform does not provide types of these sizes. In the future we
+ should use isl to derive the optimal type for each subexpression. */
+ int max_mode_int_precision
+ = GET_MODE_PRECISION (int_mode_for_size (MAX_FIXED_MODE_SIZE, 0).require ());
+ int graphite_expr_type_precision
+ = 128 <= max_mode_int_precision ? 128 : max_mode_int_precision;
+ graphite_expr_type
+ = build_nonstandard_integer_type (graphite_expr_type_precision, 0);
+}
+
/* Return the tree variable that corresponds to the given isl ast identifier
expression (an isl_ast_expr of type isl_ast_expr_id).
"Could not map isl_id to tree expression");
isl_ast_expr_free (expr_id);
tree t = res->second;
- tree *val = region->parameter_rename_map->get(t);
+ if (useless_type_conversion_p (type, TREE_TYPE (t)))
+ return t;
+ return fold_convert (type, t);
+}
+
+/* Converts an isl_ast_expr_int expression E to a widest_int.
+ Raises a code generation error when the constant doesn't fit. */
- if (!val)
- val = &t;
- return fold_convert (type, *val);
+widest_int translate_isl_ast_to_gimple::
+widest_int_from_isl_expr_int (__isl_keep isl_ast_expr *expr)
+{
+ gcc_assert (isl_ast_expr_get_type (expr) == isl_ast_expr_int);
+ isl_val *val = isl_ast_expr_get_val (expr);
+ size_t n = isl_val_n_abs_num_chunks (val, sizeof (HOST_WIDE_INT));
+ HOST_WIDE_INT *chunks = XALLOCAVEC (HOST_WIDE_INT, n);
+ if (n > WIDE_INT_MAX_ELTS
+ || isl_val_get_abs_num_chunks (val, sizeof (HOST_WIDE_INT), chunks) == -1)
+ {
+ isl_val_free (val);
+ set_codegen_error ();
+ return 0;
+ }
+ widest_int wi = widest_int::from_array (chunks, n, true);
+ if (isl_val_is_neg (val))
+ wi = -wi;
+ isl_val_free (val);
+ return wi;
}
/* Converts an isl_ast_expr_int expression E to a GCC expression tree of
- type TYPE. */
+ type TYPE. Raises a code generation error when the constant doesn't fit. */
tree translate_isl_ast_to_gimple::
gcc_expression_from_isl_expr_int (tree type, __isl_take isl_ast_expr *expr)
{
- gcc_assert (isl_ast_expr_get_type (expr) == isl_ast_expr_int);
- isl_val *val = isl_ast_expr_get_val (expr);
- mpz_t val_mpz_t;
- mpz_init (val_mpz_t);
- tree res;
- if (isl_val_get_num_gmp (val, val_mpz_t) == -1)
- res = NULL_TREE;
- else
- res = gmp_cst_to_tree (type, val_mpz_t);
- isl_val_free (val);
+ widest_int wi = widest_int_from_isl_expr_int (expr);
isl_ast_expr_free (expr);
- mpz_clear (val_mpz_t);
- return res;
+ if (codegen_error_p ())
+ return NULL_TREE;
+ if (wi::min_precision (wi, TYPE_SIGN (type)) > TYPE_PRECISION (type))
+ {
+ set_codegen_error ();
+ return NULL_TREE;
+ }
+ return wide_int_to_tree (type, wi);
}
/* Converts a binary isl_ast_expr_op expression E to a GCC expression tree of
tree translate_isl_ast_to_gimple::
binary_op_to_tree (tree type, __isl_take isl_ast_expr *expr, ivs_params &ip)
{
+ enum isl_ast_op_type expr_type = isl_ast_expr_get_op_type (expr);
isl_ast_expr *arg_expr = isl_ast_expr_get_op_arg (expr, 0);
tree tree_lhs_expr = gcc_expression_from_isl_expression (type, arg_expr, ip);
arg_expr = isl_ast_expr_get_op_arg (expr, 1);
- tree tree_rhs_expr = gcc_expression_from_isl_expression (type, arg_expr, ip);
-
- enum isl_ast_op_type expr_type = isl_ast_expr_get_op_type (expr);
isl_ast_expr_free (expr);
+ /* From our constraint generation we may get modulo operations that
+ we cannot represent explicitely but that are no-ops for TYPE.
+ Elide those. */
+ if ((expr_type == isl_ast_op_pdiv_r
+ || expr_type == isl_ast_op_zdiv_r
+ || expr_type == isl_ast_op_add)
+ && isl_ast_expr_get_type (arg_expr) == isl_ast_expr_int
+ && (wi::exact_log2 (widest_int_from_isl_expr_int (arg_expr))
+ >= TYPE_PRECISION (type)))
+ {
+ isl_ast_expr_free (arg_expr);
+ return tree_lhs_expr;
+ }
+
+ tree tree_rhs_expr = gcc_expression_from_isl_expression (type, arg_expr, ip);
if (codegen_error_p ())
return NULL_TREE;
return fold_build2 (MULT_EXPR, type, tree_lhs_expr, tree_rhs_expr);
case isl_ast_op_div:
- /* As isl operates on arbitrary precision numbers, we may end up with
- division by 2^64 that is folded to 0. */
- if (integer_zerop (tree_rhs_expr))
- {
- codegen_error = true;
- return NULL_TREE;
- }
return fold_build2 (EXACT_DIV_EXPR, type, tree_lhs_expr, tree_rhs_expr);
case isl_ast_op_pdiv_q:
- /* As isl operates on arbitrary precision numbers, we may end up with
- division by 2^64 that is folded to 0. */
- if (integer_zerop (tree_rhs_expr))
- {
- codegen_error = true;
- return NULL_TREE;
- }
return fold_build2 (TRUNC_DIV_EXPR, type, tree_lhs_expr, tree_rhs_expr);
case isl_ast_op_zdiv_r:
case isl_ast_op_pdiv_r:
- /* As isl operates on arbitrary precision numbers, we may end up with
- division by 2^64 that is folded to 0. */
- if (integer_zerop (tree_rhs_expr))
- {
- codegen_error = true;
- return NULL_TREE;
- }
return fold_build2 (TRUNC_MOD_EXPR, type, tree_lhs_expr, tree_rhs_expr);
case isl_ast_op_fdiv_q:
- /* As isl operates on arbitrary precision numbers, we may end up with
- division by 2^64 that is folded to 0. */
- if (integer_zerop (tree_rhs_expr))
- {
- codegen_error = true;
- return NULL_TREE;
- }
return fold_build2 (FLOOR_DIV_EXPR, type, tree_lhs_expr, tree_rhs_expr);
case isl_ast_op_and:
if (codegen_error_p ())
return NULL_TREE;
- return fold_build3 (COND_EXPR, type, a, b, c);
+ return fold_build3 (COND_EXPR, type, a,
+ rewrite_to_non_trapping_overflow (b),
+ rewrite_to_non_trapping_overflow (c));
}
/* Converts a unary isl_ast_expr_op expression E to a GCC expression tree of
return res;
}
-/* All loops generated by create_empty_loop_on_edge have the form of
- a post-test loop:
-
- do
-
- {
- body of the loop;
- } while (lower bound < upper bound);
-
- We create a new if region protecting the loop to be executed, if
- the execution count is zero (lower bound > upper bound). */
+/* Translates an isl_ast_node_for to Gimple. */
edge translate_isl_ast_to_gimple::
-graphite_create_new_loop_guard (edge entry_edge,
- __isl_keep isl_ast_node *node_for, tree *type,
- tree *lb, tree *ub, ivs_params &ip)
+translate_isl_ast_node_for (loop_p context_loop, __isl_keep isl_ast_node *node,
+ edge next_e, ivs_params &ip)
{
- gcc_assert (isl_ast_node_get_type (node_for) == isl_ast_node_for);
- tree cond_expr;
- edge exit_edge;
-
- *type =
- build_nonstandard_integer_type (graphite_expression_type_precision, 0);
- isl_ast_expr *for_init = isl_ast_node_for_get_init (node_for);
- *lb = gcc_expression_from_isl_expression (*type, for_init, ip);
+ gcc_assert (isl_ast_node_get_type (node) == isl_ast_node_for);
+ tree type = graphite_expr_type;
+ isl_ast_expr *for_init = isl_ast_node_for_get_init (node);
+ tree lb = gcc_expression_from_isl_expression (type, for_init, ip);
/* To fail code generation, we generate wrong code until we discard it. */
if (codegen_error_p ())
- *lb = integer_zero_node;
-
- isl_ast_expr *upper_bound = get_upper_bound (node_for);
- *ub = gcc_expression_from_isl_expression (*type, upper_bound, ip);
+ lb = integer_zero_node;
+ isl_ast_expr *upper_bound = get_upper_bound (node);
+ tree ub = gcc_expression_from_isl_expression (type, upper_bound, ip);
/* To fail code generation, we generate wrong code until we discard it. */
if (codegen_error_p ())
- *ub = integer_zero_node;
-
- /* When ub is simply a constant or a parameter, use lb <= ub. */
- if (TREE_CODE (*ub) == INTEGER_CST || TREE_CODE (*ub) == SSA_NAME)
- cond_expr = fold_build2 (LE_EXPR, boolean_type_node, *lb, *ub);
+ ub = integer_zero_node;
+
+ edge last_e = single_succ_edge (split_edge (next_e));
+
+ /* Compensate for the fact that we emit a do { } while loop from
+ a for ISL AST.
+ ??? We often miss constraints on niter because the SESE region
+ doesn't cover loop header copies. Ideally we'd add constraints
+ for all relevant dominating conditions. */
+ if (TREE_CODE (lb) == INTEGER_CST && TREE_CODE (ub) == INTEGER_CST
+ && tree_int_cst_compare (lb, ub) <= 0)
+ ;
else
{
- tree one = (POINTER_TYPE_P (*type)
- ? convert_to_ptrofftype (integer_one_node)
- : fold_convert (*type, integer_one_node));
+ tree one = build_one_cst (POINTER_TYPE_P (type) ? sizetype : type);
/* Adding +1 and using LT_EXPR helps with loop latches that have a
loop iteration count of "PARAMETER - 1". For PARAMETER == 0 this
becomes 2^k-1 due to integer overflow, and the condition lb <= ub
is true, even if we do not want this. However lb < ub + 1 is false,
as expected. */
- tree ub_one = fold_build2 (POINTER_TYPE_P (*type) ? POINTER_PLUS_EXPR
- : PLUS_EXPR, *type, *ub, one);
-
- cond_expr = fold_build2 (LT_EXPR, boolean_type_node, *lb, ub_one);
- }
-
- if (integer_onep (cond_expr))
- exit_edge = entry_edge;
- else
- exit_edge = create_empty_if_region_on_edge (entry_edge,
- unshare_expr (cond_expr));
-
- return exit_edge;
-}
-
-/* Translates an isl_ast_node_for to Gimple. */
-
-edge translate_isl_ast_to_gimple::
-translate_isl_ast_node_for (loop_p context_loop, __isl_keep isl_ast_node *node,
- edge next_e, ivs_params &ip)
-{
- gcc_assert (isl_ast_node_get_type (node) == isl_ast_node_for);
- tree type, lb, ub;
- edge last_e = graphite_create_new_loop_guard (next_e, node, &type,
- &lb, &ub, ip);
-
- if (last_e == next_e)
- {
- /* There was no guard generated. */
- last_e = single_succ_edge (split_edge (last_e));
-
- translate_isl_ast_for_loop (context_loop, node, next_e,
- type, lb, ub, ip);
- return last_e;
+ tree ub_one = fold_build2 (POINTER_TYPE_P (type)
+ ? POINTER_PLUS_EXPR : PLUS_EXPR,
+ type, unshare_expr (ub), one);
+ create_empty_if_region_on_edge (next_e,
+ fold_build2 (LT_EXPR, boolean_type_node,
+ unshare_expr (lb), ub_one));
+ next_e = get_true_edge_from_guard_bb (next_e->dest);
}
- edge true_e = get_true_edge_from_guard_bb (next_e->dest);
- merge_points.safe_push (last_e);
-
- last_e = single_succ_edge (split_edge (last_e));
- translate_isl_ast_for_loop (context_loop, node, true_e, type, lb, ub, ip);
-
+ translate_isl_ast_for_loop (context_loop, node, next_e,
+ type, lb, ub, ip);
return last_e;
}
for (i = 1; i < isl_ast_expr_get_op_n_arg (user_expr); i++)
{
arg_expr = isl_ast_expr_get_op_arg (user_expr, i);
- tree type =
- build_nonstandard_integer_type (graphite_expression_type_precision, 0);
+ tree type = graphite_expr_type;
tree t = gcc_expression_from_isl_expression (type, arg_expr, ip);
/* To fail code generation, we generate wrong code until we discard it. */
isl_ast_expr_free (user_expr);
basic_block old_bb = GBB_BB (gbb);
- if (dump_file)
+ if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file,
"[codegen] copying from bb_%d on edge (bb_%d, bb_%d)\n",
old_bb->index, next_e->src->index, next_e->dest->index);
print_loops_bb (dump_file, GBB_BB (gbb), 0, 3);
-
}
next_e = copy_bb_and_scalar_dependences (old_bb, next_e, iv_map);
if (codegen_error_p ())
return NULL;
- if (dump_file)
+ if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file, "[codegen] (after copy) new basic block\n");
print_loops_bb (dump_file, next_e->src, 0, 3);
graphite_create_new_guard (edge entry_edge, __isl_take isl_ast_expr *if_cond,
ivs_params &ip)
{
- tree type =
- build_nonstandard_integer_type (graphite_expression_type_precision, 0);
+ tree type = graphite_expr_type;
tree cond_expr = gcc_expression_from_isl_expression (type, if_cond, ip);
/* To fail code generation, we generate wrong code until we discard it. */
}
}
-/* Return true when BB contains loop close phi nodes. A loop close phi node is
- at the exit of loop which takes one argument that is the last value of the
- variable being used out of the loop. */
-
-static bool
-bb_contains_loop_close_phi_nodes (basic_block bb)
-{
- return single_pred_p (bb)
- && bb->loop_father != single_pred_edge (bb)->src->loop_father;
-}
-
-/* Return true when BB contains loop phi nodes. A loop phi node is the loop
- header containing phi nodes which has one init-edge and one back-edge. */
-
-static bool
-bb_contains_loop_phi_nodes (basic_block bb)
-{
- if (EDGE_COUNT (bb->preds) != 2)
- return false;
-
- unsigned depth = loop_depth (bb->loop_father);
-
- edge preds[2] = { (*bb->preds)[0], (*bb->preds)[1] };
-
- if (depth > loop_depth (preds[0]->src->loop_father)
- || depth > loop_depth (preds[1]->src->loop_father))
- return true;
-
- /* When one of the edges correspond to the same loop father and other
- doesn't. */
- if (bb->loop_father != preds[0]->src->loop_father
- && bb->loop_father == preds[1]->src->loop_father)
- return true;
-
- if (bb->loop_father != preds[1]->src->loop_father
- && bb->loop_father == preds[0]->src->loop_father)
- return true;
-
- return false;
-}
-
-/* Check if USE is defined in a basic block from where the definition of USE can
- propagate from all the paths. FIXME: Verify checks for virtual operands. */
-
-static bool
-is_loop_closed_ssa_use (basic_block bb, tree use)
-{
- if (TREE_CODE (use) != SSA_NAME || virtual_operand_p (use))
- return true;
-
- /* For close-phi nodes def always comes from a loop which has a back-edge. */
- if (bb_contains_loop_close_phi_nodes (bb))
- return true;
-
- gimple *def = SSA_NAME_DEF_STMT (use);
- basic_block def_bb = gimple_bb (def);
- return (!def_bb
- || flow_bb_inside_loop_p (def_bb->loop_father, bb));
-}
-
-/* Return the number of phi nodes in BB. */
-
-static int
-number_of_phi_nodes (basic_block bb)
-{
- int num_phis = 0;
- for (gphi_iterator psi = gsi_start_phis (bb); !gsi_end_p (psi);
- gsi_next (&psi))
- num_phis++;
- return num_phis;
-}
-
-/* Returns true if BB uses name in one of its PHIs. */
-
-static bool
-phi_uses_name (basic_block bb, tree name)
-{
- for (gphi_iterator psi = gsi_start_phis (bb); !gsi_end_p (psi);
- gsi_next (&psi))
- {
- gphi *phi = psi.phi ();
- for (unsigned i = 0; i < gimple_phi_num_args (phi); i++)
- {
- tree use_arg = gimple_phi_arg_def (phi, i);
- if (use_arg == name)
- return true;
- }
- }
- return false;
-}
-
-/* Return true if RENAME (defined in BB) is a valid use in NEW_BB. The
- definition should flow into use, and the use should respect the loop-closed
- SSA form. */
-
-bool translate_isl_ast_to_gimple::
-is_valid_rename (tree rename, basic_block def_bb, basic_block use_bb,
- phi_node_kind phi_kind, tree old_name, basic_block old_bb) const
-{
- /* The def of the rename must either dominate the uses or come from a
- back-edge. Also the def must respect the loop closed ssa form. */
- if (!is_loop_closed_ssa_use (use_bb, rename))
- {
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] rename not in loop closed ssa: ");
- print_generic_expr (dump_file, rename, 0);
- fprintf (dump_file, "\n");
- }
- return false;
- }
-
- if (dominated_by_p (CDI_DOMINATORS, use_bb, def_bb))
- return true;
-
- if (bb_contains_loop_phi_nodes (use_bb) && phi_kind == loop_phi)
- {
- /* The loop-header dominates the loop-body. */
- if (!dominated_by_p (CDI_DOMINATORS, def_bb, use_bb))
- return false;
-
- /* RENAME would be used in loop-phi. */
- gcc_assert (number_of_phi_nodes (use_bb));
-
- /* For definitions coming from back edges, we should check that
- old_name is used in a loop PHI node.
- FIXME: Verify if this is true. */
- if (phi_uses_name (old_bb, old_name))
- return true;
- }
- return false;
-}
-
-/* Returns the expression associated to OLD_NAME (which is used in OLD_BB), in
- NEW_BB from RENAME_MAP. PHI_KIND determines the kind of phi node. */
-
-tree translate_isl_ast_to_gimple::
-get_rename (basic_block new_bb, tree old_name, basic_block old_bb,
- phi_node_kind phi_kind) const
-{
- gcc_assert (TREE_CODE (old_name) == SSA_NAME);
- vec <tree> *renames = region->rename_map->get (old_name);
-
- if (!renames || renames->is_empty ())
- return NULL_TREE;
-
- if (1 == renames->length ())
- {
- tree rename = (*renames)[0];
- if (TREE_CODE (rename) == SSA_NAME)
- {
- basic_block bb = gimple_bb (SSA_NAME_DEF_STMT (rename));
- if (is_valid_rename (rename, bb, new_bb, phi_kind, old_name, old_bb)
- && (phi_kind == close_phi
- || flow_bb_inside_loop_p (bb->loop_father, new_bb)))
- return rename;
- return NULL_TREE;
- }
-
- if (is_constant (rename))
- return rename;
-
- return NULL_TREE;
- }
-
- /* More than one renames corresponding to the old_name. Find the rename for
- which the definition flows into usage at new_bb. */
- int i;
- tree t1 = NULL_TREE, t2;
- basic_block t1_bb = NULL;
- FOR_EACH_VEC_ELT (*renames, i, t2)
- {
- basic_block t2_bb = gimple_bb (SSA_NAME_DEF_STMT (t2));
-
- /* Defined in the same basic block as used. */
- if (t2_bb == new_bb)
- return t2;
-
- /* NEW_BB and T2_BB are in two unrelated if-clauses. */
- if (!dominated_by_p (CDI_DOMINATORS, new_bb, t2_bb))
- continue;
-
- if (!flow_bb_inside_loop_p (t2_bb->loop_father, new_bb))
- continue;
-
- /* Compute the nearest dominator. */
- if (!t1 || dominated_by_p (CDI_DOMINATORS, t2_bb, t1_bb))
- {
- t1_bb = t2_bb;
- t1 = t2;
- }
- }
-
- return t1;
-}
-
/* Register in RENAME_MAP the rename tuple (OLD_NAME, EXPR).
When OLD_NAME and EXPR are the same we assert. */
if (dump_file)
{
fprintf (dump_file, "[codegen] setting rename: old_name = ");
- print_generic_expr (dump_file, old_name, 0);
- fprintf (dump_file, ", new_name = ");
- print_generic_expr (dump_file, expr, 0);
+ print_generic_expr (dump_file, old_name);
+ fprintf (dump_file, ", new decl = ");
+ print_generic_expr (dump_file, expr);
fprintf (dump_file, "\n");
}
-
- if (old_name == expr)
- return;
-
- vec <tree> *renames = region->rename_map->get (old_name);
-
- if (renames)
- renames->safe_push (expr);
- else
- {
- vec<tree> r;
- r.create (2);
- r.safe_push (expr);
- region->rename_map->put (old_name, r);
- }
-
- tree t;
- int i;
- /* For a parameter of a scop we don't want to rename it. */
- FOR_EACH_VEC_ELT (region->params, i, t)
- if (old_name == t)
- region->parameter_rename_map->put(old_name, expr);
+ bool res = region->rename_map->put (old_name, expr);
+ gcc_assert (! res);
}
/* Return an iterator to the instructions comes last in the execution order.
FOR_EACH_VEC_ELT (stmts, i, use_stmt)
{
gcc_assert (gimple_code (use_stmt) != GIMPLE_PHI);
- gimple_stmt_iterator gsi_def_stmt = gsi_start_bb_nondebug (begin_bb);
+ gimple_stmt_iterator gsi_def_stmt = gsi_start_nondebug_bb (begin_bb);
use_operand_p use_p;
ssa_op_iter op_iter;
else if (gimple_code (gsi_stmt (gsi_def_stmt)) == GIMPLE_PHI)
{
gimple_stmt_iterator bsi
- = gsi_start_bb_nondebug (gsi_bb (gsi_def_stmt));
+ = gsi_start_nondebug_bb (gsi_bb (gsi_def_stmt));
/* Insert right after the PHI statements. */
gsi_insert_before (&bsi, use_stmt, GSI_NEW_STMT);
}
if (dump_file)
{
- fprintf (dump_file, "[codegen] inserting statement: ");
+ fprintf (dump_file, "[codegen] inserting statement in BB %d: ",
+ gimple_bb (use_stmt)->index);
print_gimple_stmt (dump_file, use_stmt, 0, TDF_VOPS | TDF_MEMSYMS);
- print_loops_bb (dump_file, gimple_bb (use_stmt), 0, 3);
}
}
}
-/* Collect all the operands of NEW_EXPR by recursively visiting each
- operand. */
-
-void translate_isl_ast_to_gimple::
-collect_all_ssa_names (tree new_expr, vec<tree> *vec_ssa)
-{
- if (new_expr == NULL_TREE)
- return;
-
- /* Rename all uses in new_expr. */
- if (TREE_CODE (new_expr) == SSA_NAME)
- {
- vec_ssa->safe_push (new_expr);
- return;
- }
-
- /* Iterate over SSA_NAMES in NEW_EXPR. */
- for (int i = 0; i < (TREE_CODE_LENGTH (TREE_CODE (new_expr))); i++)
- {
- tree op = TREE_OPERAND (new_expr, i);
- collect_all_ssa_names (op, vec_ssa);
- }
-}
-
-/* This is abridged version of the function copied from:
- tree.c:substitute_in_expr (tree exp, tree f, tree r). */
-
-static tree
-substitute_ssa_name (tree exp, tree f, tree r)
-{
- enum tree_code code = TREE_CODE (exp);
- tree op0, op1, op2, op3;
- tree new_tree;
-
- /* We handle TREE_LIST and COMPONENT_REF separately. */
- if (code == TREE_LIST)
- {
- op0 = substitute_ssa_name (TREE_CHAIN (exp), f, r);
- op1 = substitute_ssa_name (TREE_VALUE (exp), f, r);
- if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
- return exp;
-
- return tree_cons (TREE_PURPOSE (exp), op1, op0);
- }
- else if (code == COMPONENT_REF)
- {
- tree inner;
-
- /* If this expression is getting a value from a PLACEHOLDER_EXPR
- and it is the right field, replace it with R. */
- for (inner = TREE_OPERAND (exp, 0);
- REFERENCE_CLASS_P (inner);
- inner = TREE_OPERAND (inner, 0))
- ;
-
- /* The field. */
- op1 = TREE_OPERAND (exp, 1);
-
- if (TREE_CODE (inner) == PLACEHOLDER_EXPR && op1 == f)
- return r;
-
- /* If this expression hasn't been completed let, leave it alone. */
- if (TREE_CODE (inner) == PLACEHOLDER_EXPR && !TREE_TYPE (inner))
- return exp;
-
- op0 = substitute_ssa_name (TREE_OPERAND (exp, 0), f, r);
- if (op0 == TREE_OPERAND (exp, 0))
- return exp;
-
- new_tree
- = fold_build3 (COMPONENT_REF, TREE_TYPE (exp), op0, op1, NULL_TREE);
- }
- else
- switch (TREE_CODE_CLASS (code))
- {
- case tcc_constant:
- return exp;
-
- case tcc_declaration:
- if (exp == f)
- return r;
- else
- return exp;
-
- case tcc_expression:
- if (exp == f)
- return r;
-
- /* Fall through. */
-
- case tcc_exceptional:
- case tcc_unary:
- case tcc_binary:
- case tcc_comparison:
- case tcc_reference:
- switch (TREE_CODE_LENGTH (code))
- {
- case 0:
- if (exp == f)
- return r;
- return exp;
-
- case 1:
- op0 = substitute_ssa_name (TREE_OPERAND (exp, 0), f, r);
- if (op0 == TREE_OPERAND (exp, 0))
- return exp;
-
- new_tree = fold_build1 (code, TREE_TYPE (exp), op0);
- break;
-
- case 2:
- op0 = substitute_ssa_name (TREE_OPERAND (exp, 0), f, r);
- op1 = substitute_ssa_name (TREE_OPERAND (exp, 1), f, r);
-
- if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
- return exp;
-
- new_tree = fold_build2 (code, TREE_TYPE (exp), op0, op1);
- break;
-
- case 3:
- op0 = substitute_ssa_name (TREE_OPERAND (exp, 0), f, r);
- op1 = substitute_ssa_name (TREE_OPERAND (exp, 1), f, r);
- op2 = substitute_ssa_name (TREE_OPERAND (exp, 2), f, r);
-
- if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
- && op2 == TREE_OPERAND (exp, 2))
- return exp;
-
- new_tree = fold_build3 (code, TREE_TYPE (exp), op0, op1, op2);
- break;
-
- case 4:
- op0 = substitute_ssa_name (TREE_OPERAND (exp, 0), f, r);
- op1 = substitute_ssa_name (TREE_OPERAND (exp, 1), f, r);
- op2 = substitute_ssa_name (TREE_OPERAND (exp, 2), f, r);
- op3 = substitute_ssa_name (TREE_OPERAND (exp, 3), f, r);
-
- if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
- && op2 == TREE_OPERAND (exp, 2)
- && op3 == TREE_OPERAND (exp, 3))
- return exp;
-
- new_tree
- = fold (build4 (code, TREE_TYPE (exp), op0, op1, op2, op3));
- break;
-
- default:
- gcc_unreachable ();
- }
- break;
-
- case tcc_vl_exp:
- default:
- gcc_unreachable ();
- }
-
- TREE_READONLY (new_tree) |= TREE_READONLY (exp);
-
- if (code == INDIRECT_REF || code == ARRAY_REF || code == ARRAY_RANGE_REF)
- TREE_THIS_NOTRAP (new_tree) |= TREE_THIS_NOTRAP (exp);
-
- return new_tree;
-}
-
-/* Rename all the operands of NEW_EXPR by recursively visiting each operand. */
-
-tree translate_isl_ast_to_gimple::
-rename_all_uses (tree new_expr, basic_block new_bb, basic_block old_bb)
-{
- auto_vec<tree, 2> ssa_names;
- collect_all_ssa_names (new_expr, &ssa_names);
- tree t;
- int i;
- FOR_EACH_VEC_ELT (ssa_names, i, t)
- if (tree r = get_rename (new_bb, t, old_bb, unknown_phi))
- new_expr = substitute_ssa_name (new_expr, t, r);
-
- return new_expr;
-}
-
/* For ops which are scev_analyzeable, we can regenerate a new name from its
scalar evolution around LOOP. */
tree translate_isl_ast_to_gimple::
get_rename_from_scev (tree old_name, gimple_seq *stmts, loop_p loop,
- basic_block new_bb, basic_block old_bb,
vec<tree> iv_map)
{
- tree scev = scalar_evolution_in_region (region->region, loop, old_name);
+ tree scev = cached_scalar_evolution_in_region (region->region,
+ loop, old_name);
/* At this point we should know the exact scev for each
scalar SSA_NAME used in the scop: all the other scalar
tree new_expr;
if (chrec_contains_undetermined (scev))
{
- codegen_error = true;
+ set_codegen_error ();
return build_zero_cst (TREE_TYPE (old_name));
}
if (chrec_contains_undetermined (new_expr)
|| tree_contains_chrecs (new_expr, NULL))
{
- codegen_error = true;
+ set_codegen_error ();
return build_zero_cst (TREE_TYPE (old_name));
}
- if (TREE_CODE (new_expr) == SSA_NAME)
- {
- basic_block bb = gimple_bb (SSA_NAME_DEF_STMT (new_expr));
- if (bb && !dominated_by_p (CDI_DOMINATORS, new_bb, bb))
- {
- codegen_error = true;
- return build_zero_cst (TREE_TYPE (old_name));
- }
- }
-
- new_expr = rename_all_uses (new_expr, new_bb, old_bb);
-
- /* We check all the operands and all of them should dominate the use at
- new_expr. */
- auto_vec <tree, 2> new_ssa_names;
- collect_all_ssa_names (new_expr, &new_ssa_names);
- int i;
- tree new_ssa_name;
- FOR_EACH_VEC_ELT (new_ssa_names, i, new_ssa_name)
- {
- if (TREE_CODE (new_ssa_name) == SSA_NAME)
- {
- basic_block bb = gimple_bb (SSA_NAME_DEF_STMT (new_ssa_name));
- if (bb && !dominated_by_p (CDI_DOMINATORS, new_bb, bb))
- {
- codegen_error = true;
- return build_zero_cst (TREE_TYPE (old_name));
- }
- }
- }
-
/* Replace the old_name with the new_expr. */
return force_gimple_operand (unshare_expr (new_expr), stmts,
true, NULL_TREE);
}
-/* Renames the scalar uses of the statement COPY, using the
- substitution map RENAME_MAP, inserting the gimplification code at
- GSI_TGT, for the translation REGION, with the original copied
- statement in LOOP, and using the induction variable renaming map
- IV_MAP. Returns true when something has been renamed. */
-bool translate_isl_ast_to_gimple::
-rename_uses (gimple *copy, gimple_stmt_iterator *gsi_tgt, basic_block old_bb,
- loop_p loop, vec<tree> iv_map)
+/* Return true if STMT should be copied from region to the new code-generated
+ region. LABELs, CONDITIONS, induction-variables and region parameters need
+ not be copied. */
+
+static bool
+should_copy_to_new_region (gimple *stmt, sese_info_p region)
{
- bool changed = false;
-
- if (is_gimple_debug (copy))
- {
- if (gimple_debug_bind_p (copy))
- gimple_debug_bind_reset_value (copy);
- else if (gimple_debug_source_bind_p (copy))
- return false;
- else
- gcc_unreachable ();
-
- return false;
- }
-
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] renaming uses of stmt: ");
- print_gimple_stmt (dump_file, copy, 0, 0);
- }
-
- use_operand_p use_p;
- ssa_op_iter op_iter;
- FOR_EACH_SSA_USE_OPERAND (use_p, copy, op_iter, SSA_OP_USE)
- {
- tree old_name = USE_FROM_PTR (use_p);
-
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] renaming old_name = ");
- print_generic_expr (dump_file, old_name, 0);
- fprintf (dump_file, "\n");
- }
-
- if (TREE_CODE (old_name) != SSA_NAME
- || SSA_NAME_IS_DEFAULT_DEF (old_name))
- continue;
-
- changed = true;
- tree new_expr = get_rename (gsi_tgt->bb, old_name,
- old_bb, unknown_phi);
-
- if (new_expr)
- {
- tree type_old_name = TREE_TYPE (old_name);
- tree type_new_expr = TREE_TYPE (new_expr);
-
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] from rename_map: new_name = ");
- print_generic_expr (dump_file, new_expr, 0);
- fprintf (dump_file, "\n");
- }
-
- if (type_old_name != type_new_expr
- || TREE_CODE (new_expr) != SSA_NAME)
- {
- tree var = create_tmp_var (type_old_name, "var");
-
- if (!useless_type_conversion_p (type_old_name, type_new_expr))
- new_expr = fold_convert (type_old_name, new_expr);
-
- gimple_seq stmts;
- new_expr = force_gimple_operand (new_expr, &stmts, true, var);
- gsi_insert_earliest (stmts);
- }
-
- replace_exp (use_p, new_expr);
- continue;
- }
-
- gimple_seq stmts;
- new_expr = get_rename_from_scev (old_name, &stmts, loop, gimple_bb (copy),
- old_bb, iv_map);
- if (!new_expr || codegen_error_p ())
- return false;
-
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] not in rename map, scev: ");
- print_generic_expr (dump_file, new_expr, 0);
- fprintf (dump_file, "\n");
- }
-
- gsi_insert_earliest (stmts);
- replace_exp (use_p, new_expr);
-
- if (TREE_CODE (new_expr) == INTEGER_CST
- && is_gimple_assign (copy))
- {
- tree rhs = gimple_assign_rhs1 (copy);
-
- if (TREE_CODE (rhs) == ADDR_EXPR)
- recompute_tree_invariant_for_addr_expr (rhs);
- }
-
- set_rename (old_name, new_expr);
- }
-
- return changed;
-}
-
-/* Returns a basic block that could correspond to where a constant was defined
- in the original code. In the original code OLD_BB had the definition, we
- need to find which basic block out of the copies of old_bb, in the new
- region, should a definition correspond to if it has to reach BB. */
-
-basic_block translate_isl_ast_to_gimple::
-get_def_bb_for_const (basic_block bb, basic_block old_bb) const
-{
- vec <basic_block> *bbs = region->copied_bb_map->get (old_bb);
-
- if (!bbs || bbs->is_empty ())
- return NULL;
-
- if (1 == bbs->length ())
- return (*bbs)[0];
-
- int i;
- basic_block b1 = NULL, b2;
- FOR_EACH_VEC_ELT (*bbs, i, b2)
- {
- if (b2 == bb)
- return bb;
-
- /* BB and B2 are in two unrelated if-clauses. */
- if (!dominated_by_p (CDI_DOMINATORS, bb, b2))
- continue;
-
- /* Compute the nearest dominator. */
- if (!b1 || dominated_by_p (CDI_DOMINATORS, b2, b1))
- b1 = b2;
- }
-
- return b1;
-}
-
-/* Get the new name of OP (from OLD_BB) to be used in NEW_BB. PHI_KIND
- determines the kind of phi node. */
-
-tree translate_isl_ast_to_gimple::
-get_new_name (basic_block new_bb, tree op,
- basic_block old_bb, phi_node_kind phi_kind) const
-{
- /* For constants the names are the same. */
- if (TREE_CODE (op) != SSA_NAME)
- return op;
-
- return get_rename (new_bb, op, old_bb, phi_kind);
-}
-
-/* Return a debug location for OP. */
-
-static location_t
-get_loc (tree op)
-{
- location_t loc = UNKNOWN_LOCATION;
-
- if (TREE_CODE (op) == SSA_NAME)
- loc = gimple_location (SSA_NAME_DEF_STMT (op));
- return loc;
-}
-
-/* Returns the incoming edges of basic_block BB in the pair. The first edge is
- the init edge (from outside the loop) and the second one is the back edge
- from the same loop. */
-
-std::pair<edge, edge>
-get_edges (basic_block bb)
-{
- std::pair<edge, edge> edges;
- edge e;
- edge_iterator ei;
- FOR_EACH_EDGE (e, ei, bb->preds)
- if (bb->loop_father != e->src->loop_father)
- edges.first = e;
- else
- edges.second = e;
- return edges;
-}
-
-/* Copy the PHI arguments from OLD_PHI to the NEW_PHI. The arguments to NEW_PHI
- must be found unless they can be POSTPONEd for later. */
-
-bool translate_isl_ast_to_gimple::
-copy_loop_phi_args (gphi *old_phi, init_back_edge_pair_t &ibp_old_bb,
- gphi *new_phi, init_back_edge_pair_t &ibp_new_bb,
- bool postpone)
-{
- gcc_assert (gimple_phi_num_args (old_phi) == gimple_phi_num_args (new_phi));
-
- basic_block new_bb = gimple_bb (new_phi);
- for (unsigned i = 0; i < gimple_phi_num_args (old_phi); i++)
- {
- edge e;
- if (gimple_phi_arg_edge (old_phi, i) == ibp_old_bb.first)
- e = ibp_new_bb.first;
- else
- e = ibp_new_bb.second;
-
- tree old_name = gimple_phi_arg_def (old_phi, i);
- tree new_name = get_new_name (new_bb, old_name,
- gimple_bb (old_phi), loop_phi);
- if (new_name)
- {
- add_phi_arg (new_phi, new_name, e, get_loc (old_name));
- continue;
- }
-
- gimple *old_def_stmt = SSA_NAME_DEF_STMT (old_name);
- if (!old_def_stmt || gimple_code (old_def_stmt) == GIMPLE_NOP)
- /* If the phi arg was a function arg, or wasn't defined, just use the
- old name. */
- add_phi_arg (new_phi, old_name, e, get_loc (old_name));
- else if (postpone)
- {
- /* Postpone code gen for later for those back-edges we don't have the
- names yet. */
- region->incomplete_phis.safe_push (std::make_pair (old_phi, new_phi));
- if (dump_file)
- fprintf (dump_file, "[codegen] postpone loop phi nodes.\n");
- }
- else
- /* Either we should add the arg to phi or, we should postpone. */
- return false;
- }
- return true;
-}
-
-/* Copy loop phi nodes from BB to NEW_BB. */
-
-bool translate_isl_ast_to_gimple::
-copy_loop_phi_nodes (basic_block bb, basic_block new_bb)
-{
- if (dump_file)
- fprintf (dump_file, "[codegen] copying loop phi nodes in bb_%d.\n",
- new_bb->index);
-
- /* Loop phi nodes should have only two arguments. */
- gcc_assert (2 == EDGE_COUNT (bb->preds));
-
- /* First edge is the init edge and second is the back edge. */
- init_back_edge_pair_t ibp_old_bb = get_edges (bb);
-
- /* First edge is the init edge and second is the back edge. */
- init_back_edge_pair_t ibp_new_bb = get_edges (new_bb);
-
- for (gphi_iterator psi = gsi_start_phis (bb); !gsi_end_p (psi);
- gsi_next (&psi))
- {
- gphi *phi = psi.phi ();
- tree res = gimple_phi_result (phi);
- if (virtual_operand_p (res))
- continue;
- if (is_gimple_reg (res) && scev_analyzable_p (res, region->region))
- continue;
-
- gphi *new_phi = create_phi_node (SSA_NAME_VAR (res), new_bb);
- tree new_res = create_new_def_for (res, new_phi,
- gimple_phi_result_ptr (new_phi));
- set_rename (res, new_res);
- codegen_error = !copy_loop_phi_args (phi, ibp_old_bb, new_phi,
- ibp_new_bb, true);
- update_stmt (new_phi);
-
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] creating loop-phi node: ");
- print_gimple_stmt (dump_file, new_phi, 0, 0);
- }
- }
-
- return true;
-}
-
-/* Return the init value of PHI, the value coming from outside the loop. */
-
-static tree
-get_loop_init_value (gphi *phi)
-{
-
- loop_p loop = gimple_bb (phi)->loop_father;
-
- edge e;
- edge_iterator ei;
- FOR_EACH_EDGE (e, ei, gimple_bb (phi)->preds)
- if (e->src->loop_father != loop)
- return gimple_phi_arg_def (phi, e->dest_idx);
-
- return NULL_TREE;
-}
-
-/* Find the init value (the value which comes from outside the loop), of one of
- the operands of DEF which is defined by a loop phi. */
-
-static tree
-find_init_value (gimple *def)
-{
- if (gimple_code (def) == GIMPLE_PHI)
- return get_loop_init_value (as_a <gphi*> (def));
-
- if (gimple_vuse (def))
- return NULL_TREE;
-
- ssa_op_iter iter;
- use_operand_p use_p;
- FOR_EACH_SSA_USE_OPERAND (use_p, def, iter, SSA_OP_USE)
- {
- tree use = USE_FROM_PTR (use_p);
- if (TREE_CODE (use) == SSA_NAME)
- {
- if (tree res = find_init_value (SSA_NAME_DEF_STMT (use)))
- return res;
- }
- }
-
- return NULL_TREE;
-}
-
-/* Return the init value, the value coming from outside the loop. */
-
-static tree
-find_init_value_close_phi (gphi *phi)
-{
- gcc_assert (gimple_phi_num_args (phi) == 1);
- tree use_arg = gimple_phi_arg_def (phi, 0);
- gimple *def = SSA_NAME_DEF_STMT (use_arg);
- return find_init_value (def);
-}
-
-
-tree translate_isl_ast_to_gimple::
-add_close_phis_to_outer_loops (tree last_merge_name, edge last_e,
- gimple *old_close_phi)
-{
- sese_l &codegen_region = region->if_region->true_region->region;
- gimple *stmt = SSA_NAME_DEF_STMT (last_merge_name);
- basic_block bb = gimple_bb (stmt);
- if (!bb_in_sese_p (bb, codegen_region))
- return last_merge_name;
-
- loop_p loop = bb->loop_father;
- if (!loop_in_sese_p (loop, codegen_region))
- return last_merge_name;
-
- edge e = single_exit (loop);
-
- if (dominated_by_p (CDI_DOMINATORS, e->dest, last_e->src))
- return last_merge_name;
-
- tree old_name = gimple_phi_arg_def (old_close_phi, 0);
- tree old_close_phi_name = gimple_phi_result (old_close_phi);
-
- bb = e->dest;
- if (!bb_contains_loop_close_phi_nodes (bb) || !single_succ_p (bb))
- bb = split_edge (e);
-
- gphi *close_phi = create_phi_node (SSA_NAME_VAR (last_merge_name), bb);
- tree res = create_new_def_for (last_merge_name, close_phi,
- gimple_phi_result_ptr (close_phi));
- set_rename (old_close_phi_name, res);
- add_phi_arg (close_phi, last_merge_name, e, get_loc (old_name));
- last_merge_name = res;
-
- return add_close_phis_to_outer_loops (last_merge_name, last_e, old_close_phi);
-}
-
-/* Add phi nodes to all merge points of all the diamonds enclosing the loop of
- the close phi node PHI. */
-
-bool translate_isl_ast_to_gimple::
-add_close_phis_to_merge_points (gphi *old_close_phi, gphi *new_close_phi,
- tree default_value)
-{
- sese_l &codegen_region = region->if_region->true_region->region;
- basic_block default_value_bb = get_entry_bb (codegen_region);
- if (SSA_NAME == TREE_CODE (default_value))
- {
- gimple *stmt = SSA_NAME_DEF_STMT (default_value);
- if (!stmt || gimple_code (stmt) == GIMPLE_NOP)
- return false;
- default_value_bb = gimple_bb (stmt);
- }
-
- basic_block new_close_phi_bb = gimple_bb (new_close_phi);
-
- tree old_close_phi_name = gimple_phi_result (old_close_phi);
- tree new_close_phi_name = gimple_phi_result (new_close_phi);
- tree last_merge_name = new_close_phi_name;
- tree old_name = gimple_phi_arg_def (old_close_phi, 0);
-
- int i;
- edge merge_e;
- FOR_EACH_VEC_ELT_REVERSE (merge_points, i, merge_e)
- {
- basic_block new_merge_bb = merge_e->src;
- if (!dominated_by_p (CDI_DOMINATORS, new_merge_bb, default_value_bb))
- continue;
-
- last_merge_name = add_close_phis_to_outer_loops (last_merge_name, merge_e,
- old_close_phi);
-
- gphi *merge_phi = create_phi_node (SSA_NAME_VAR (old_close_phi_name), new_merge_bb);
- tree merge_res = create_new_def_for (old_close_phi_name, merge_phi,
- gimple_phi_result_ptr (merge_phi));
- set_rename (old_close_phi_name, merge_res);
-
- edge from_loop = NULL, from_default_value = NULL;
- edge e;
- edge_iterator ei;
- FOR_EACH_EDGE (e, ei, new_merge_bb->preds)
- if (dominated_by_p (CDI_DOMINATORS, e->src, new_close_phi_bb))
- from_loop = e;
- else
- from_default_value = e;
-
- /* Because CDI_POST_DOMINATORS are not updated, we only rely on
- CDI_DOMINATORS, which may not handle all cases where new_close_phi_bb
- is contained in another condition. */
- if (!from_default_value || !from_loop)
- return false;
-
- add_phi_arg (merge_phi, last_merge_name, from_loop, get_loc (old_name));
- add_phi_arg (merge_phi, default_value, from_default_value, get_loc (old_name));
-
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] Adding guard-phi: ");
- print_gimple_stmt (dump_file, merge_phi, 0, 0);
- }
-
- update_stmt (merge_phi);
- last_merge_name = merge_res;
- }
-
- return true;
-}
-
-/* Copy all the loop-close phi args from BB to NEW_BB. */
-
-bool translate_isl_ast_to_gimple::
-copy_loop_close_phi_args (basic_block old_bb, basic_block new_bb, bool postpone)
-{
- for (gphi_iterator psi = gsi_start_phis (old_bb); !gsi_end_p (psi);
- gsi_next (&psi))
- {
- gphi *old_close_phi = psi.phi ();
- tree res = gimple_phi_result (old_close_phi);
- if (virtual_operand_p (res))
- continue;
-
- if (is_gimple_reg (res) && scev_analyzable_p (res, region->region))
- /* Loop close phi nodes should not be scev_analyzable_p. */
- gcc_unreachable ();
-
- gphi *new_close_phi = create_phi_node (SSA_NAME_VAR (res), new_bb);
- tree new_res = create_new_def_for (res, new_close_phi,
- gimple_phi_result_ptr (new_close_phi));
- set_rename (res, new_res);
-
- tree old_name = gimple_phi_arg_def (old_close_phi, 0);
- tree new_name = get_new_name (new_bb, old_name, old_bb, close_phi);
-
- /* Predecessor basic blocks of a loop close phi should have been code
- generated before. FIXME: This is fixable by merging PHIs from inner
- loops as well. See: gfortran.dg/graphite/interchange-3.f90. */
- if (!new_name)
- return false;
-
- add_phi_arg (new_close_phi, new_name, single_pred_edge (new_bb),
- get_loc (old_name));
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] Adding loop close phi: ");
- print_gimple_stmt (dump_file, new_close_phi, 0, 0);
- }
-
- update_stmt (new_close_phi);
-
- /* When there is no loop guard around this codegenerated loop, there is no
- need to collect the close-phi arg. */
- if (merge_points.is_empty ())
- continue;
-
- /* Add a PHI in the succ_new_bb for each close phi of the loop. */
- tree default_value = find_init_value_close_phi (new_close_phi);
-
- /* A close phi must come from a loop-phi having a default value. */
- if (!default_value)
- {
- if (!postpone)
- return false;
-
- region->incomplete_phis.safe_push (std::make_pair (old_close_phi,
- new_close_phi));
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] postpone close phi nodes: ");
- print_gimple_stmt (dump_file, new_close_phi, 0, 0);
- }
- continue;
- }
-
- if (!add_close_phis_to_merge_points (old_close_phi, new_close_phi,
- default_value))
- return false;
- }
-
- return true;
-}
-
-/* Copy loop close phi nodes from BB to NEW_BB. */
-
-bool translate_isl_ast_to_gimple::
-copy_loop_close_phi_nodes (basic_block old_bb, basic_block new_bb)
-{
- if (dump_file)
- fprintf (dump_file, "[codegen] copying loop close phi nodes in bb_%d.\n",
- new_bb->index);
- /* Loop close phi nodes should have only one argument. */
- gcc_assert (1 == EDGE_COUNT (old_bb->preds));
-
- return copy_loop_close_phi_args (old_bb, new_bb, true);
-}
-
-
-/* Add NEW_NAME as the ARGNUM-th arg of NEW_PHI which is in NEW_BB.
- DOMINATING_PRED is the predecessor basic block of OLD_BB which dominates the
- other pred of OLD_BB as well. If no such basic block exists then it is NULL.
- NON_DOMINATING_PRED is a pred which does not dominate OLD_BB, it cannot be
- NULL.
-
- Case1: OLD_BB->preds {BB1, BB2} and BB1 does not dominate BB2 and vice versa.
- In this case DOMINATING_PRED = NULL.
-
- Case2: OLD_BB->preds {BB1, BB2} and BB1 dominates BB2.
-
- Returns true on successful copy of the args, false otherwise. */
-
-bool translate_isl_ast_to_gimple::
-add_phi_arg_for_new_expr (tree old_phi_args[2], tree new_phi_args[2],
- edge old_bb_dominating_edge,
- edge old_bb_non_dominating_edge,
- gphi *phi, gphi *new_phi,
- basic_block new_bb)
-{
- basic_block def_pred[2] = { NULL, NULL };
- int not_found_bb_index = -1;
- for (int i = 0; i < 2; i++)
- {
- /* If the corresponding def_bb could not be found the entry will be
- NULL. */
- if (TREE_CODE (old_phi_args[i]) == INTEGER_CST)
- def_pred[i] = get_def_bb_for_const (new_bb,
- gimple_phi_arg_edge (phi, i)->src);
- else if (new_phi_args[i] && (TREE_CODE (new_phi_args[i]) == SSA_NAME))
- def_pred[i] = gimple_bb (SSA_NAME_DEF_STMT (new_phi_args[i]));
-
- if (!def_pred[i])
- {
- /* When non are available bail out. */
- if (not_found_bb_index != -1)
- return false;
- not_found_bb_index = i;
- }
- }
-
- /* Here we are pattern matching on the structure of CFG w.r.t. old one. */
- if (old_bb_dominating_edge)
- {
- if (not_found_bb_index != -1)
- return false;
-
- basic_block new_pred1 = (*new_bb->preds)[0]->src;
- basic_block new_pred2 = (*new_bb->preds)[1]->src;
- vec <basic_block> *bbs
- = region->copied_bb_map->get (old_bb_non_dominating_edge->src);
-
- /* Could not find a mapping. */
- if (!bbs)
- return false;
-
- basic_block new_pred = NULL;
- basic_block b;
- int i;
- FOR_EACH_VEC_ELT (*bbs, i, b)
- {
- if (dominated_by_p (CDI_DOMINATORS, new_pred1, b))
- {
- /* FIXME: If we have already found new_pred then we have to
- disambiguate, bail out for now. */
- if (new_pred)
- return false;
- new_pred = new_pred1;
- }
- if (dominated_by_p (CDI_DOMINATORS, new_pred2, b))
- {
- /* FIXME: If we have already found new_pred then we have to either
- it dominates both or we have to disambiguate, bail out. */
- if (new_pred)
- return false;
- new_pred = new_pred2;
- }
- }
-
- if (!new_pred)
- return false;
-
- edge new_non_dominating_edge = find_edge (new_pred, new_bb);
- gcc_assert (new_non_dominating_edge);
- /* FIXME: Validate each args just like in loop-phis. */
- /* By the process of elimination we first insert insert phi-edge for
- non-dominating pred which is computed above and then we insert the
- remaining one. */
- int inserted_edge = 0;
- for (; inserted_edge < 2; inserted_edge++)
- {
- edge new_bb_pred_edge = gimple_phi_arg_edge (new_phi, inserted_edge);
- if (new_non_dominating_edge == new_bb_pred_edge)
- {
- add_phi_arg (new_phi, new_phi_args[inserted_edge],
- new_non_dominating_edge,
- get_loc (old_phi_args[inserted_edge]));
- break;
- }
- }
- if (inserted_edge == 2)
- return false;
-
- int edge_dominating = inserted_edge == 0 ? 1 : 0;
-
- edge new_dominating_edge = NULL;
- for (inserted_edge = 0; inserted_edge < 2; inserted_edge++)
- {
- edge e = gimple_phi_arg_edge (new_phi, inserted_edge);
- if (e != new_non_dominating_edge)
- {
- new_dominating_edge = e;
- add_phi_arg (new_phi, new_phi_args[edge_dominating],
- new_dominating_edge,
- get_loc (old_phi_args[inserted_edge]));
- break;
- }
- }
- gcc_assert (new_dominating_edge);
- }
- else
- {
- /* Classic diamond structure: both edges are non-dominating. We need to
- find one unique edge then the other can be found be elimination. If
- any definition (def_pred) dominates both the preds of new_bb then we
- bail out. Entries of def_pred maybe NULL, in that case we must
- uniquely find pred with help of only one entry. */
- edge new_e[2] = { NULL, NULL };
- for (int i = 0; i < 2; i++)
- {
- edge e;
- edge_iterator ei;
- FOR_EACH_EDGE (e, ei, new_bb->preds)
- if (def_pred[i]
- && dominated_by_p (CDI_DOMINATORS, e->src, def_pred[i]))
- {
- if (new_e[i])
- /* We do not know how to handle the case when def_pred
- dominates more than a predecessor. */
- return false;
- new_e[i] = e;
- }
- }
-
- gcc_assert (new_e[0] || new_e[1]);
-
- /* Find the other edge by process of elimination. */
- if (not_found_bb_index != -1)
- {
- gcc_assert (!new_e[not_found_bb_index]);
- int found_bb_index = not_found_bb_index == 1 ? 0 : 1;
- edge e;
- edge_iterator ei;
- FOR_EACH_EDGE (e, ei, new_bb->preds)
- {
- if (new_e[found_bb_index] == e)
- continue;
- new_e[not_found_bb_index] = e;
- }
- }
-
- /* Add edges to phi args. */
- for (int i = 0; i < 2; i++)
- add_phi_arg (new_phi, new_phi_args[i], new_e[i],
- get_loc (old_phi_args[i]));
- }
-
- return true;
-}
-
-/* Copy the arguments of cond-phi node PHI, to NEW_PHI in the codegenerated
- region. If postpone is true and it isn't possible to copy any arg of PHI,
- the PHI is added to the REGION->INCOMPLETE_PHIS to be codegenerated later.
- Returns false if the copying was unsuccessful. */
-
-bool translate_isl_ast_to_gimple::
-copy_cond_phi_args (gphi *phi, gphi *new_phi, vec<tree> iv_map, bool postpone)
-{
- if (dump_file)
- fprintf (dump_file, "[codegen] copying cond phi args.\n");
- gcc_assert (2 == gimple_phi_num_args (phi));
-
- basic_block new_bb = gimple_bb (new_phi);
- loop_p loop = gimple_bb (phi)->loop_father;
-
- basic_block old_bb = gimple_bb (phi);
- edge old_bb_non_dominating_edge = NULL, old_bb_dominating_edge = NULL;
-
- edge e;
- edge_iterator ei;
- FOR_EACH_EDGE (e, ei, old_bb->preds)
- if (!dominated_by_p (CDI_DOMINATORS, old_bb, e->src))
- old_bb_non_dominating_edge = e;
- else
- old_bb_dominating_edge = e;
-
- gcc_assert (!dominated_by_p (CDI_DOMINATORS, old_bb,
- old_bb_non_dominating_edge->src));
-
- tree new_phi_args[2];
- tree old_phi_args[2];
-
- for (unsigned i = 0; i < gimple_phi_num_args (phi); i++)
- {
- tree old_name = gimple_phi_arg_def (phi, i);
- tree new_name = get_new_name (new_bb, old_name, old_bb, cond_phi);
- old_phi_args[i] = old_name;
- if (new_name)
- {
- new_phi_args [i] = new_name;
- continue;
- }
-
- /* If the phi-arg was a parameter. */
- if (vec_find (region->params, old_name) != -1)
- {
- new_phi_args [i] = old_name;
- if (dump_file)
- {
- fprintf (dump_file,
- "[codegen] parameter argument to phi, new_expr: ");
- print_generic_expr (dump_file, new_phi_args[i], 0);
- fprintf (dump_file, "\n");
- }
- continue;
- }
-
- gimple *old_def_stmt = SSA_NAME_DEF_STMT (old_name);
- if (!old_def_stmt || gimple_code (old_def_stmt) == GIMPLE_NOP)
- /* FIXME: If the phi arg was a function arg, or wasn't defined, just use
- the old name. */
- return false;
-
- if (postpone)
- {
- /* If the phi-arg is scev-analyzeable but only in the first stage. */
- if (is_gimple_reg (old_name)
- && scev_analyzable_p (old_name, region->region))
- {
- gimple_seq stmts;
- tree new_expr = get_rename_from_scev (old_name, &stmts, loop,
- new_bb, old_bb, iv_map);
- if (codegen_error_p ())
- return false;
-
- gcc_assert (new_expr);
- if (dump_file)
- {
- fprintf (dump_file,
- "[codegen] scev analyzeable, new_expr: ");
- print_generic_expr (dump_file, new_expr, 0);
- fprintf (dump_file, "\n");
- }
- gsi_insert_earliest (stmts);
- new_phi_args[i] = new_expr;
- continue;
- }
-
- /* Postpone code gen for later for back-edges. */
- region->incomplete_phis.safe_push (std::make_pair (phi, new_phi));
-
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] postpone cond phi nodes: ");
- print_gimple_stmt (dump_file, new_phi, 0, 0);
- }
-
- new_phi_args [i] = NULL_TREE;
- continue;
- }
- else
- /* Either we should add the arg to phi or, we should postpone. */
- return false;
- }
-
- /* If none of the args have been determined in the first stage then wait until
- later. */
- if (postpone && !new_phi_args[0] && !new_phi_args[1])
- return true;
-
- return add_phi_arg_for_new_expr (old_phi_args, new_phi_args,
- old_bb_dominating_edge,
- old_bb_non_dominating_edge,
- phi, new_phi, new_bb);
-}
-
-/* Copy cond phi nodes from BB to NEW_BB. A cond-phi node is a basic block
- containing phi nodes coming from two predecessors, and none of them are back
- edges. */
-
-bool translate_isl_ast_to_gimple::
-copy_cond_phi_nodes (basic_block bb, basic_block new_bb, vec<tree> iv_map)
-{
-
- gcc_assert (!bb_contains_loop_close_phi_nodes (bb));
-
- /* TODO: Handle cond phi nodes with more than 2 predecessors. */
- if (EDGE_COUNT (bb->preds) != 2)
- return false;
-
- if (dump_file)
- fprintf (dump_file, "[codegen] copying cond phi nodes in bb_%d.\n",
- new_bb->index);
-
- for (gphi_iterator psi = gsi_start_phis (bb); !gsi_end_p (psi);
- gsi_next (&psi))
- {
- gphi *phi = psi.phi ();
- tree res = gimple_phi_result (phi);
- if (virtual_operand_p (res))
- continue;
-
- gphi *new_phi = create_phi_node (SSA_NAME_VAR (res), new_bb);
- tree new_res = create_new_def_for (res, new_phi,
- gimple_phi_result_ptr (new_phi));
- set_rename (res, new_res);
-
- if (!copy_cond_phi_args (phi, new_phi, iv_map, true))
- return false;
-
- update_stmt (new_phi);
- }
-
- return true;
-}
-
-/* Return true if STMT should be copied from region to the new code-generated
- region. LABELs, CONDITIONS, induction-variables and region parameters need
- not be copied. */
-
-static bool
-should_copy_to_new_region (gimple *stmt, sese_info_p region)
-{
- /* Do not copy labels or conditions. */
- if (gimple_code (stmt) == GIMPLE_LABEL
- || gimple_code (stmt) == GIMPLE_COND)
- return false;
+ /* Do not copy labels or conditions. */
+ if (gimple_code (stmt) == GIMPLE_LABEL
+ || gimple_code (stmt) == GIMPLE_COND)
+ return false;
tree lhs;
/* Do not copy induction variables. */
if (is_gimple_assign (stmt)
&& (lhs = gimple_assign_lhs (stmt))
&& TREE_CODE (lhs) == SSA_NAME
- && is_gimple_reg (lhs)
- && scev_analyzable_p (lhs, region->region))
- return false;
-
- /* Do not copy parameters that have been generated in the header of the
- scop. */
- if (is_gimple_assign (stmt)
- && (lhs = gimple_assign_lhs (stmt))
- && TREE_CODE (lhs) == SSA_NAME
- && region->parameter_rename_map->get(lhs))
+ && scev_analyzable_p (lhs, region->region)
+ /* But to code-generate liveouts - liveout PHI generation is
+ in generic sese.c code that cannot do code generation. */
+ && ! bitmap_bit_p (region->liveout, SSA_NAME_VERSION (lhs)))
return false;
return true;
}
-/* Create new names for all the definitions created by COPY and add replacement
- mappings for each new name. */
-
-void translate_isl_ast_to_gimple::
-set_rename_for_each_def (gimple *stmt)
-{
- def_operand_p def_p;
- ssa_op_iter op_iter;
- FOR_EACH_SSA_DEF_OPERAND (def_p, stmt, op_iter, SSA_OP_ALL_DEFS)
- {
- tree old_name = DEF_FROM_PTR (def_p);
- tree new_name = create_new_def_for (old_name, stmt, def_p);
- set_rename (old_name, new_name);
- }
-}
-
/* Duplicates the statements of basic block BB into basic block NEW_BB
and compute the new induction variables according to the IV_MAP. */
-bool translate_isl_ast_to_gimple::
+void translate_isl_ast_to_gimple::
graphite_copy_stmts_from_block (basic_block bb, basic_block new_bb,
vec<tree> iv_map)
{
/* Create a new copy of STMT and duplicate STMT's virtual
operands. */
gimple *copy = gimple_copy (stmt);
- gsi_insert_after (&gsi_tgt, copy, GSI_NEW_STMT);
- if (dump_file)
+ /* Rather than not copying debug stmts we reset them.
+ ??? Where we can rewrite uses without inserting new
+ stmts we could simply do that. */
+ if (is_gimple_debug (copy))
{
- fprintf (dump_file, "[codegen] inserting statement: ");
- print_gimple_stmt (dump_file, copy, 0, 0);
+ if (gimple_debug_bind_p (copy))
+ gimple_debug_bind_reset_value (copy);
+ else if (gimple_debug_source_bind_p (copy)
+ || gimple_debug_nonbind_marker_p (copy))
+ ;
+ else
+ gcc_unreachable ();
}
maybe_duplicate_eh_stmt (copy, stmt);
gimple_duplicate_stmt_histograms (cfun, copy, cfun, stmt);
/* Crete new names for each def in the copied stmt. */
- set_rename_for_each_def (copy);
-
- loop_p loop = bb->loop_father;
- if (rename_uses (copy, &gsi_tgt, bb, loop, iv_map))
+ def_operand_p def_p;
+ ssa_op_iter op_iter;
+ FOR_EACH_SSA_DEF_OPERAND (def_p, copy, op_iter, SSA_OP_ALL_DEFS)
{
- fold_stmt_inplace (&gsi_tgt);
- gcc_assert (gsi_stmt (gsi_tgt) == copy);
+ tree old_name = DEF_FROM_PTR (def_p);
+ create_new_def_for (old_name, copy, def_p);
}
- if (codegen_error_p ())
- return false;
+ gsi_insert_after (&gsi_tgt, copy, GSI_NEW_STMT);
+ if (dump_file)
+ {
+ fprintf (dump_file, "[codegen] inserting statement: ");
+ print_gimple_stmt (dump_file, copy, 0);
+ }
- /* For each SSA_NAME in the parameter_rename_map rename their usage. */
+ /* For each SCEV analyzable SSA_NAME, rename their usage. */
ssa_op_iter iter;
use_operand_p use_p;
if (!is_gimple_debug (copy))
- FOR_EACH_SSA_USE_OPERAND (use_p, copy, iter, SSA_OP_USE)
- {
- tree old_name = USE_FROM_PTR (use_p);
-
- if (TREE_CODE (old_name) != SSA_NAME
- || SSA_NAME_IS_DEFAULT_DEF (old_name))
- continue;
+ {
+ bool changed = false;
+ FOR_EACH_SSA_USE_OPERAND (use_p, copy, iter, SSA_OP_USE)
+ {
+ tree old_name = USE_FROM_PTR (use_p);
- tree *new_expr = region->parameter_rename_map->get (old_name);
- if (!new_expr)
- continue;
+ if (TREE_CODE (old_name) != SSA_NAME
+ || SSA_NAME_IS_DEFAULT_DEF (old_name)
+ || ! scev_analyzable_p (old_name, region->region))
+ continue;
- replace_exp (use_p, *new_expr);
- }
+ gimple_seq stmts = NULL;
+ tree new_name = get_rename_from_scev (old_name, &stmts,
+ bb->loop_father, iv_map);
+ if (! codegen_error_p ())
+ gsi_insert_earliest (stmts);
+ replace_exp (use_p, new_name);
+ changed = true;
+ }
+ if (changed)
+ fold_stmt_inplace (&gsi_tgt);
+ }
update_stmt (copy);
}
-
- return true;
}
-/* Given a basic block containing close-phi it returns the new basic block where
- to insert a copy of the close-phi nodes. All the uses in close phis should
- come from a single loop otherwise it returns NULL. */
-
-edge translate_isl_ast_to_gimple::
-edge_for_new_close_phis (basic_block bb)
-{
- /* Make sure that NEW_BB is the new_loop->exit->dest. We find the definition
- of close phi in the original code and then find the mapping of basic block
- defining that variable. If there are multiple close-phis and they are
- defined in different loops (in the original or in the new code) because of
- loop splitting, then we bail out. */
- loop_p new_loop = NULL;
- for (gphi_iterator psi = gsi_start_phis (bb); !gsi_end_p (psi);
- gsi_next (&psi))
- {
- gphi *phi = psi.phi ();
- tree name = gimple_phi_arg_def (phi, 0);
- basic_block old_loop_bb = gimple_bb (SSA_NAME_DEF_STMT (name));
-
- vec <basic_block> *bbs = region->copied_bb_map->get (old_loop_bb);
- if (!bbs || bbs->length () != 1)
- /* This is one of the places which shows preserving original structure
- is not always possible, as we may need to insert close PHI for a loop
- where the latch does not have any mapping, or the mapping is
- ambiguous. */
- return NULL;
-
- if (!new_loop)
- new_loop = (*bbs)[0]->loop_father;
- else if (new_loop != (*bbs)[0]->loop_father)
- return NULL;
- }
-
- if (!new_loop)
- return NULL;
-
- return single_exit (new_loop);
-}
-
/* Copies BB and includes in the copied BB all the statements that can
be reached following the use-def chains from the memory accesses,
and returns the next edge following this new block. */
edge translate_isl_ast_to_gimple::
copy_bb_and_scalar_dependences (basic_block bb, edge next_e, vec<tree> iv_map)
{
- int num_phis = number_of_phi_nodes (bb);
-
- if (region->copied_bb_map->get (bb))
- {
- /* FIXME: we should be able to handle phi nodes with args coming from
- outside the region. */
- if (num_phis)
- {
- codegen_error = true;
- return NULL;
- }
- }
-
- basic_block new_bb = NULL;
- if (bb_contains_loop_close_phi_nodes (bb))
+ basic_block new_bb = split_edge (next_e);
+ gimple_stmt_iterator gsi_tgt = gsi_last_bb (new_bb);
+ for (gphi_iterator psi = gsi_start_phis (bb); !gsi_end_p (psi);
+ gsi_next (&psi))
{
- if (dump_file)
- fprintf (dump_file, "[codegen] bb_%d contains close phi nodes.\n",
- bb->index);
+ gphi *phi = psi.phi ();
+ tree res = gimple_phi_result (phi);
+ if (virtual_operand_p (res)
+ || scev_analyzable_p (res, region->region))
+ continue;
- edge e = edge_for_new_close_phis (bb);
- if (!e)
+ tree new_phi_def;
+ tree *rename = region->rename_map->get (res);
+ if (! rename)
{
- codegen_error = true;
- return NULL;
+ new_phi_def = create_tmp_reg (TREE_TYPE (res));
+ set_rename (res, new_phi_def);
}
+ else
+ new_phi_def = *rename;
- basic_block phi_bb = e->dest;
-
- if (!bb_contains_loop_close_phi_nodes (phi_bb) || !single_succ_p (phi_bb))
- phi_bb = split_edge (e);
-
- gcc_assert (single_pred_edge (phi_bb)->src->loop_father
- != single_pred_edge (phi_bb)->dest->loop_father);
+ gassign *ass = gimple_build_assign (NULL_TREE, new_phi_def);
+ create_new_def_for (res, ass, NULL);
+ gsi_insert_after (&gsi_tgt, ass, GSI_NEW_STMT);
+ }
- if (!copy_loop_close_phi_nodes (bb, phi_bb))
- {
- codegen_error = true;
- return NULL;
- }
+ graphite_copy_stmts_from_block (bb, new_bb, iv_map);
- if (e == next_e)
- new_bb = phi_bb;
- else
- new_bb = split_edge (next_e);
- }
- else
+ /* Insert out-of SSA copies on the original BB outgoing edges. */
+ gsi_tgt = gsi_last_bb (new_bb);
+ basic_block bb_for_succs = bb;
+ if (bb_for_succs == bb_for_succs->loop_father->latch
+ && bb_in_sese_p (bb_for_succs, region->region)
+ && sese_trivially_empty_bb_p (bb_for_succs))
+ bb_for_succs = NULL;
+ while (bb_for_succs)
{
- new_bb = split_edge (next_e);
- if (num_phis > 0 && bb_contains_loop_phi_nodes (bb))
+ basic_block latch = NULL;
+ edge_iterator ei;
+ edge e;
+ FOR_EACH_EDGE (e, ei, bb_for_succs->succs)
{
- basic_block phi_bb = next_e->dest->loop_father->header;
-
- /* At this point we are unable to codegenerate by still preserving the SSA
- structure because maybe the loop is completely unrolled and the PHIs
- and cross-bb scalar dependencies are untrackable w.r.t. the original
- code. See gfortran.dg/graphite/pr29832.f90. */
- if (EDGE_COUNT (bb->preds) != EDGE_COUNT (phi_bb->preds))
- {
- codegen_error = true;
- return NULL;
- }
-
- /* In case isl did some loop peeling, like this:
-
- S_8(0);
- for (int c1 = 1; c1 <= 5; c1 += 1) {
- S_8(c1);
- }
- S_8(6);
-
- there should be no loop-phi nodes in S_8(0).
-
- FIXME: We need to reason about dynamic instances of S_8, i.e., the
- values of all scalar variables: for the moment we instantiate only
- SCEV analyzable expressions on the iteration domain, and we need to
- extend that to reductions that cannot be analyzed by SCEV. */
- if (!bb_in_sese_p (phi_bb, region->if_region->true_region->region))
- {
- codegen_error = true;
- return NULL;
- }
-
- if (dump_file)
- fprintf (dump_file, "[codegen] bb_%d contains loop phi nodes.\n",
- bb->index);
- if (!copy_loop_phi_nodes (bb, phi_bb))
+ for (gphi_iterator psi = gsi_start_phis (e->dest); !gsi_end_p (psi);
+ gsi_next (&psi))
{
- codegen_error = true;
- return NULL;
- }
- }
- else if (num_phis > 0)
- {
- if (dump_file)
- fprintf (dump_file, "[codegen] bb_%d contains cond phi nodes.\n",
- bb->index);
-
- basic_block phi_bb = single_pred (new_bb);
- loop_p loop_father = new_bb->loop_father;
+ gphi *phi = psi.phi ();
+ tree res = gimple_phi_result (phi);
+ if (virtual_operand_p (res)
+ || scev_analyzable_p (res, region->region))
+ continue;
- /* Move back until we find the block with two predecessors. */
- while (single_pred_p (phi_bb))
- phi_bb = single_pred_edge (phi_bb)->src;
+ tree new_phi_def;
+ tree *rename = region->rename_map->get (res);
+ if (! rename)
+ {
+ new_phi_def = create_tmp_reg (TREE_TYPE (res));
+ set_rename (res, new_phi_def);
+ }
+ else
+ new_phi_def = *rename;
- /* If a corresponding merge-point was not found, then abort codegen. */
- if (phi_bb->loop_father != loop_father
- || !bb_in_sese_p (phi_bb, region->if_region->true_region->region)
- || !copy_cond_phi_nodes (bb, phi_bb, iv_map))
- {
- codegen_error = true;
- return NULL;
+ tree arg = PHI_ARG_DEF_FROM_EDGE (phi, e);
+ if (TREE_CODE (arg) == SSA_NAME
+ && scev_analyzable_p (arg, region->region))
+ {
+ gimple_seq stmts = NULL;
+ tree new_name = get_rename_from_scev (arg, &stmts,
+ bb->loop_father,
+ iv_map);
+ if (! codegen_error_p ())
+ gsi_insert_earliest (stmts);
+ arg = new_name;
+ }
+ gassign *ass = gimple_build_assign (new_phi_def, arg);
+ gsi_insert_after (&gsi_tgt, ass, GSI_NEW_STMT);
}
+ if (e->dest == bb_for_succs->loop_father->latch
+ && bb_in_sese_p (e->dest, region->region)
+ && sese_trivially_empty_bb_p (e->dest))
+ latch = e->dest;
}
- }
-
- if (dump_file)
- fprintf (dump_file, "[codegen] copying from bb_%d to bb_%d.\n",
- bb->index, new_bb->index);
-
- vec <basic_block> *copied_bbs = region->copied_bb_map->get (bb);
- if (copied_bbs)
- copied_bbs->safe_push (new_bb);
- else
- {
- vec<basic_block> bbs;
- bbs.create (2);
- bbs.safe_push (new_bb);
- region->copied_bb_map->put (bb, bbs);
- }
-
- if (!graphite_copy_stmts_from_block (bb, new_bb, iv_map))
- {
- codegen_error = true;
- return NULL;
+ bb_for_succs = latch;
}
return single_succ_edge (new_bb);
}
-/* Patch the missing arguments of the phi nodes. */
-
-void translate_isl_ast_to_gimple::
-translate_pending_phi_nodes ()
-{
- int i;
- phi_rename *rename;
- FOR_EACH_VEC_ELT (region->incomplete_phis, i, rename)
- {
- gphi *old_phi = rename->first;
- gphi *new_phi = rename->second;
- basic_block old_bb = gimple_bb (old_phi);
- basic_block new_bb = gimple_bb (new_phi);
-
- /* First edge is the init edge and second is the back edge. */
- init_back_edge_pair_t ibp_old_bb = get_edges (old_bb);
- init_back_edge_pair_t ibp_new_bb = get_edges (new_bb);
-
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] translating pending old-phi: ");
- print_gimple_stmt (dump_file, old_phi, 0, 0);
- }
-
- auto_vec <tree, 1> iv_map;
- if (bb_contains_loop_phi_nodes (new_bb))
- codegen_error = !copy_loop_phi_args (old_phi, ibp_old_bb, new_phi,
- ibp_new_bb, false);
- else if (bb_contains_loop_close_phi_nodes (new_bb))
- codegen_error = !copy_loop_close_phi_args (old_bb, new_bb, false);
- else
- codegen_error = !copy_cond_phi_args (old_phi, new_phi, iv_map, false);
-
- if (dump_file)
- {
- fprintf (dump_file, "[codegen] to new-phi: ");
- print_gimple_stmt (dump_file, new_phi, 0, 0);
- }
- if (codegen_error_p ())
- return;
- }
-}
-
/* Add isl's parameter identifiers and corresponding trees to ivs_params. */
void translate_isl_ast_to_gimple::
{
sese_info_p region = scop->scop_info;
unsigned nb_parameters = isl_set_dim (scop->param_context, isl_dim_param);
- gcc_assert (nb_parameters == region->params.length ());
+ gcc_assert (nb_parameters == sese_nb_params (region));
unsigned i;
- for (i = 0; i < nb_parameters; i++)
+ tree param;
+ FOR_EACH_VEC_ELT (region->params, i, param)
{
isl_id *tmp_id = isl_set_get_dim_id (scop->param_context,
isl_dim_param, i);
- ip[tmp_id] = region->params[i];
+ ip[tmp_id] = param;
}
}
__isl_give isl_ast_node *translate_isl_ast_to_gimple::
scop_to_isl_ast (scop_p scop)
{
+ int old_err = isl_options_get_on_error (scop->isl_context);
+ int old_max_operations = isl_ctx_get_max_operations (scop->isl_context);
+ int max_operations = param_max_isl_operations;
+ if (max_operations)
+ isl_ctx_set_max_operations (scop->isl_context, max_operations);
+ isl_options_set_on_error (scop->isl_context, ISL_ON_ERROR_CONTINUE);
+
gcc_assert (scop->transformed_schedule);
/* Set the separate option to reduce control flow overhead. */
isl_ast_node *ast_isl = isl_ast_build_node_from_schedule
(context_isl, schedule);
isl_ast_build_free (context_isl);
- return ast_isl;
-}
-
-/* Copy def from sese REGION to the newly created TO_REGION. TR is defined by
- DEF_STMT. GSI points to entry basic block of the TO_REGION. */
-
-static void
-copy_def (tree tr, gimple *def_stmt, sese_info_p region, sese_info_p to_region,
- gimple_stmt_iterator *gsi)
-{
- if (!defined_in_sese_p (tr, region->region))
- return;
-
- ssa_op_iter iter;
- use_operand_p use_p;
- FOR_EACH_SSA_USE_OPERAND (use_p, def_stmt, iter, SSA_OP_USE)
- {
- tree use_tr = USE_FROM_PTR (use_p);
-
- /* Do not copy parameters that have been generated in the header of the
- scop. */
- if (region->parameter_rename_map->get(use_tr))
- continue;
-
- gimple *def_of_use = SSA_NAME_DEF_STMT (use_tr);
- if (!def_of_use)
- continue;
-
- copy_def (use_tr, def_of_use, region, to_region, gsi);
- }
-
- gimple *copy = gimple_copy (def_stmt);
- gsi_insert_after (gsi, copy, GSI_NEW_STMT);
- /* Create new names for all the definitions created by COPY and
- add replacement mappings for each new name. */
- def_operand_p def_p;
- ssa_op_iter op_iter;
- FOR_EACH_SSA_DEF_OPERAND (def_p, copy, op_iter, SSA_OP_ALL_DEFS)
+ isl_options_set_on_error (scop->isl_context, old_err);
+ isl_ctx_reset_operations (scop->isl_context);
+ isl_ctx_set_max_operations (scop->isl_context, old_max_operations);
+ if (isl_ctx_last_error (scop->isl_context) != isl_error_none)
{
- tree old_name = DEF_FROM_PTR (def_p);
- tree new_name = create_new_def_for (old_name, copy, def_p);
- region->parameter_rename_map->put(old_name, new_name);
+ if (dump_enabled_p ())
+ {
+ dump_user_location_t loc = find_loop_location
+ (scop->scop_info->region.entry->dest->loop_father);
+ if (isl_ctx_last_error (scop->isl_context) == isl_error_quota)
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, loc,
+ "loop nest not optimized, AST generation timed out "
+ "after %d operations [--param max-isl-operations]\n",
+ max_operations);
+ else
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, loc,
+ "loop nest not optimized, ISL AST generation "
+ "signalled an error\n");
+ }
+ isl_ast_node_free (ast_isl);
+ return NULL;
}
- update_stmt (copy);
+ return ast_isl;
}
+/* Generate out-of-SSA copies for the entry edge FALSE_ENTRY/TRUE_ENTRY
+ in REGION. */
+
static void
-copy_internal_parameters (sese_info_p region, sese_info_p to_region)
+generate_entry_out_of_ssa_copies (edge false_entry,
+ edge true_entry,
+ sese_info_p region)
{
- /* For all the parameters which definitino is in the if_region->false_region,
- insert code on true_region (if_region->true_region->entry). */
-
- int i;
- tree tr;
- gimple_stmt_iterator gsi = gsi_start_bb(to_region->region.entry->dest);
-
- FOR_EACH_VEC_ELT (region->params, i, tr)
+ gimple_stmt_iterator gsi_tgt = gsi_start_bb (true_entry->dest);
+ for (gphi_iterator psi = gsi_start_phis (false_entry->dest);
+ !gsi_end_p (psi); gsi_next (&psi))
{
- // If def is not in region.
- gimple *def_stmt = SSA_NAME_DEF_STMT (tr);
- if (def_stmt)
- copy_def (tr, def_stmt, region, to_region, &gsi);
+ gphi *phi = psi.phi ();
+ tree res = gimple_phi_result (phi);
+ if (virtual_operand_p (res))
+ continue;
+ /* When there's no out-of-SSA var registered do not bother
+ to create one. */
+ tree *rename = region->rename_map->get (res);
+ if (! rename)
+ continue;
+ tree new_phi_def = *rename;
+ gassign *ass = gimple_build_assign (new_phi_def,
+ PHI_ARG_DEF_FROM_EDGE (phi,
+ false_entry));
+ gsi_insert_after (&gsi_tgt, ass, GSI_NEW_STMT);
}
}
timevar_push (TV_GRAPHITE_CODE_GEN);
t.add_parameters_to_ivs_params (scop, ip);
root_node = t.scop_to_isl_ast (scop);
+ if (! root_node)
+ {
+ ivs_params_clear (ip);
+ timevar_pop (TV_GRAPHITE_CODE_GEN);
+ return false;
+ }
if (dump_file && (dump_flags & TDF_DETAILS))
{
print_isl_ast (dump_file, root_node);
}
- recompute_all_dominators ();
- graphite_verify ();
-
if_region = move_sese_in_condition (region);
region->if_region = if_region;
- recompute_all_dominators ();
loop_p context_loop = region->region.entry->src->loop_father;
-
- /* Copy all the parameters which are defined in the region. */
- copy_internal_parameters(if_region->false_region, if_region->true_region);
-
edge e = single_succ_edge (if_region->true_region->region.entry->dest);
basic_block bb = split_edge (e);
region->if_region->true_region->region.exit = single_succ_edge (bb);
t.translate_isl_ast (context_loop, root_node, e, ip);
- if (t.codegen_error_p ())
- {
+ if (! t.codegen_error_p ())
+ {
+ generate_entry_out_of_ssa_copies (if_region->false_region->region.entry,
+ if_region->true_region->region.entry,
+ region);
+ sese_insert_phis_for_liveouts (region,
+ if_region->region->region.exit->src,
+ if_region->false_region->region.exit,
+ if_region->true_region->region.exit);
if (dump_file)
- fprintf (dump_file, "codegen error: "
- "reverting back to the original code.\n");
- set_ifsese_condition (if_region, integer_zero_node);
+ fprintf (dump_file, "[codegen] isl AST to Gimple succeeded.\n");
}
- else
- {
- t.translate_pending_phi_nodes ();
- if (!t.codegen_error_p ())
- {
- sese_insert_phis_for_liveouts (region,
- if_region->region->region.exit->src,
- if_region->false_region->region.exit,
- if_region->true_region->region.exit);
- mark_virtual_operands_for_renaming (cfun);
- update_ssa (TODO_update_ssa);
-
- graphite_verify ();
- scev_reset ();
- recompute_all_dominators ();
- graphite_verify ();
-
- if (dump_file)
- fprintf (dump_file, "[codegen] isl AST to Gimple succeeded.\n");
- }
- else
+ if (t.codegen_error_p ())
+ {
+ if (dump_enabled_p ())
{
- if (dump_file)
- fprintf (dump_file, "[codegen] unsuccessful in translating"
- " pending phis, reverting back to the original code.\n");
- set_ifsese_condition (if_region, integer_zero_node);
+ dump_user_location_t loc = find_loop_location
+ (scop->scop_info->region.entry->dest->loop_father);
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, loc,
+ "loop nest not optimized, code generation error\n");
}
+
+ /* Remove the unreachable region. */
+ remove_edge_and_dominated_blocks (if_region->true_region->region.entry);
+ basic_block ifb = if_region->false_region->region.entry->src;
+ gimple_stmt_iterator gsi = gsi_last_bb (ifb);
+ gsi_remove (&gsi, true);
+ if_region->false_region->region.entry->flags &= ~EDGE_FALSE_VALUE;
+ if_region->false_region->region.entry->flags |= EDGE_FALLTHRU;
+ /* remove_edge_and_dominated_blocks marks loops for removal but
+ doesn't actually remove them (fix that...). */
+ loop_p loop;
+ FOR_EACH_LOOP (loop, LI_FROM_INNERMOST)
+ if (! loop->header)
+ delete_loop (loop);
}
+ /* We are delaying SSA update to after code-generating all SCOPs.
+ This is because we analyzed DRs and parameters on the unmodified
+ IL and thus rely on SSA update to pick up new dominating definitions
+ from for example SESE liveout PHIs. This is also for efficiency
+ as SSA update does work depending on the size of the function. */
+
free (if_region->true_region);
free (if_region->region);
free (if_region);
isl_ast_node_free (root_node);
timevar_pop (TV_GRAPHITE_CODE_GEN);
- if (dump_file && (dump_flags & TDF_DETAILS))
- {
- loop_p loop;
- int num_no_dependency = 0;
-
- FOR_EACH_LOOP (loop, 0)
- if (loop->can_be_parallel)
- num_no_dependency++;
-
- fprintf (dump_file, "%d loops carried no dependency.\n",
- num_no_dependency);
- }
-
return !t.codegen_error_p ();
}
projects / gcc.git / blobdiff