/* Loop Vectorization
- Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Free Software
+ Foundation, Inc.
Contributed by Dorit Naishlos <dorit@il.ibm.com>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* Loop Vectorization Pass.
Since we only vectorize operations which vector form can be
expressed using existing tree codes, to verify that an operation is
supported, the vectorizer checks the relevant optab at the relevant
- machine_mode (e.g, add_optab->handlers[(int) V8HImode].insn_code). If
+ machine_mode (e.g, optab_handler (add_optab, V8HImode)->insn_code). If
the value found is CODE_FOR_nothing, then there's no target support, and
we can't vectorize the stmt.
#include "tree-data-ref.h"
#include "tree-scalar-evolution.h"
#include "input.h"
+#include "hashtab.h"
#include "tree-vectorizer.h"
#include "tree-pass.h"
-
-/*************************************************************************
- Simple Loop Peeling Utilities
- *************************************************************************/
-static struct loop *slpeel_tree_duplicate_loop_to_edge_cfg
- (struct loop *, struct loops *, edge);
-static void slpeel_update_phis_for_duplicate_loop
- (struct loop *, struct loop *, bool after);
-static void slpeel_update_phi_nodes_for_guard1
- (edge, struct loop *, bool, basic_block *, bitmap *);
-static void slpeel_update_phi_nodes_for_guard2
- (edge, struct loop *, bool, basic_block *);
-static edge slpeel_add_loop_guard (basic_block, tree, basic_block, basic_block);
-
-static void rename_use_op (use_operand_p);
-static void rename_variables_in_bb (basic_block);
-static void rename_variables_in_loop (struct loop *);
+#include "langhooks.h"
/*************************************************************************
General Vectorization Utilities
*************************************************************************/
-static void vect_set_dump_settings (void);
/* vect_dump will be set to stderr or dump_file if exist. */
FILE *vect_dump;
to mark that it's uninitialized. */
enum verbosity_levels vect_verbosity_level = MAX_VERBOSITY_LEVEL;
-/* Number of loops, at the beginning of vectorization. */
-unsigned int vect_loops_num;
-
/* Loop location. */
static LOC vect_loop_location;
/* Bitmap of virtual variables to be renamed. */
-bitmap vect_vnames_to_rename;
+bitmap vect_memsyms_to_rename;
+
+/* Vector mapping GIMPLE stmt to stmt_vec_info. */
+VEC(vec_void_p,heap) *stmt_vec_info_vec;
+
\f
/*************************************************************************
Simple Loop Peeling Utilities
/* Renames the variables in basic block BB. */
-static void
+void
rename_variables_in_bb (basic_block bb)
{
- tree phi;
- block_stmt_iterator bsi;
- tree stmt;
+ gimple_stmt_iterator gsi;
+ gimple stmt;
use_operand_p use_p;
ssa_op_iter iter;
edge e;
edge_iterator ei;
struct loop *loop = bb->loop_father;
- for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
- stmt = bsi_stmt (bsi);
- FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter,
- (SSA_OP_ALL_USES | SSA_OP_ALL_KILLS))
+ stmt = gsi_stmt (gsi);
+ FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_ALL_USES)
rename_use_op (use_p);
}
{
if (!flow_bb_inside_loop_p (loop, e->dest))
continue;
- for (phi = phi_nodes (e->dest); phi; phi = PHI_CHAIN (phi))
- rename_use_op (PHI_ARG_DEF_PTR_FROM_EDGE (phi, e));
+ for (gsi = gsi_start_phis (e->dest); !gsi_end_p (gsi); gsi_next (&gsi))
+ rename_use_op (PHI_ARG_DEF_PTR_FROM_EDGE (gsi_stmt (gsi), e));
}
}
/* Renames variables in new generated LOOP. */
-static void
+void
rename_variables_in_loop (struct loop *loop)
{
unsigned i;
struct loop *new_loop, bool after)
{
tree new_ssa_name;
- tree phi_new, phi_orig;
+ gimple phi_new, phi_orig;
tree def;
edge orig_loop_latch = loop_latch_edge (orig_loop);
edge orig_entry_e = loop_preheader_edge (orig_loop);
- edge new_loop_exit_e = new_loop->single_exit;
+ edge new_loop_exit_e = single_exit (new_loop);
edge new_loop_entry_e = loop_preheader_edge (new_loop);
edge entry_arg_e = (after ? orig_loop_latch : orig_entry_e);
+ gimple_stmt_iterator gsi_new, gsi_orig;
/*
step 1. For each loop-header-phi:
/* Scan the phis in the headers of the old and new loops
(they are organized in exactly the same order). */
- for (phi_new = phi_nodes (new_loop->header),
- phi_orig = phi_nodes (orig_loop->header);
- phi_new && phi_orig;
- phi_new = PHI_CHAIN (phi_new), phi_orig = PHI_CHAIN (phi_orig))
+ for (gsi_new = gsi_start_phis (new_loop->header),
+ gsi_orig = gsi_start_phis (orig_loop->header);
+ !gsi_end_p (gsi_new) && !gsi_end_p (gsi_orig);
+ gsi_next (&gsi_new), gsi_next (&gsi_orig))
{
+ phi_new = gsi_stmt (gsi_new);
+ phi_orig = gsi_stmt (gsi_orig);
+
/* step 1. */
def = PHI_ARG_DEF_FROM_EDGE (phi_orig, entry_arg_e);
add_phi_arg (phi_new, def, new_loop_entry_e);
I.E., the overall structure is:
loop1_preheader_bb:
- guard1 (goto loop1/merg1_bb)
+ guard1 (goto loop1/merge1_bb)
loop1
loop1_exit_bb:
guard2 (goto merge1_bb/merge2_bb)
In the context of the overall structure, we have:
loop1_preheader_bb:
- guard1 (goto loop1/merg1_bb)
+ guard1 (goto loop1/merge1_bb)
LOOP-> loop1
loop1_exit_bb:
guard2 (goto merge1_bb/merge2_bb)
bool is_new_loop, basic_block *new_exit_bb,
bitmap *defs)
{
- tree orig_phi, new_phi;
- tree update_phi, update_phi2;
+ gimple orig_phi, new_phi;
+ gimple update_phi, update_phi2;
tree guard_arg, loop_arg;
basic_block new_merge_bb = guard_edge->dest;
edge e = EDGE_SUCC (new_merge_bb, 0);
edge new_exit_e;
tree current_new_name;
tree name;
+ gimple_stmt_iterator gsi_orig, gsi_update;
/* Create new bb between loop and new_merge_bb. */
- *new_exit_bb = split_edge (loop->single_exit);
+ *new_exit_bb = split_edge (single_exit (loop));
new_exit_e = EDGE_SUCC (*new_exit_bb, 0);
- for (orig_phi = phi_nodes (orig_bb), update_phi = phi_nodes (update_bb);
- orig_phi && update_phi;
- orig_phi = PHI_CHAIN (orig_phi), update_phi = PHI_CHAIN (update_phi))
+ for (gsi_orig = gsi_start_phis (orig_bb),
+ gsi_update = gsi_start_phis (update_bb);
+ !gsi_end_p (gsi_orig) && !gsi_end_p (gsi_update);
+ gsi_next (&gsi_orig), gsi_next (&gsi_update))
{
+ orig_phi = gsi_stmt (gsi_orig);
+ update_phi = gsi_stmt (gsi_update);
+
/* Virtual phi; Mark it for renaming. We actually want to call
mar_sym_for_renaming, but since all ssa renaming datastructures
- are going to be freed before we get to call ssa_upate, we just
+ are going to be freed before we get to call ssa_update, we just
record this name for now in a bitmap, and will mark it for
renaming later. */
name = PHI_RESULT (orig_phi);
if (!is_gimple_reg (SSA_NAME_VAR (name)))
- bitmap_set_bit (vect_vnames_to_rename, SSA_NAME_VERSION (name));
+ bitmap_set_bit (vect_memsyms_to_rename, DECL_UID (SSA_NAME_VAR (name)));
/** 1. Handle new-merge-point phis **/
/** 2. Handle loop-closed-ssa-form phis **/
+ if (!is_gimple_reg (PHI_RESULT (orig_phi)))
+ continue;
+
/* 2.1. Generate new phi node in NEW_EXIT_BB: */
new_phi = create_phi_node (SSA_NAME_VAR (PHI_RESULT (orig_phi)),
*new_exit_bb);
/* 2.2. NEW_EXIT_BB has one incoming edge: the exit-edge of the loop. */
- add_phi_arg (new_phi, loop_arg, loop->single_exit);
+ add_phi_arg (new_phi, loop_arg, single_exit (loop));
/* 2.3. Update phi in successor of NEW_EXIT_BB: */
gcc_assert (PHI_ARG_DEF_FROM_EDGE (update_phi2, new_exit_e) == loop_arg);
set_current_def (current_new_name, PHI_RESULT (new_phi));
bitmap_set_bit (*defs, SSA_NAME_VERSION (current_new_name));
}
-
- set_phi_nodes (new_merge_bb, phi_reverse (phi_nodes (new_merge_bb)));
}
In the context of the overall structure, we have:
loop1_preheader_bb:
- guard1 (goto loop1/merg1_bb)
+ guard1 (goto loop1/merge1_bb)
loop1
loop1_exit_bb:
guard2 (goto merge1_bb/merge2_bb)
slpeel_update_phi_nodes_for_guard2 (edge guard_edge, struct loop *loop,
bool is_new_loop, basic_block *new_exit_bb)
{
- tree orig_phi, new_phi;
- tree update_phi, update_phi2;
+ gimple orig_phi, new_phi;
+ gimple update_phi, update_phi2;
tree guard_arg, loop_arg;
basic_block new_merge_bb = guard_edge->dest;
edge e = EDGE_SUCC (new_merge_bb, 0);
tree orig_def, orig_def_new_name;
tree new_name, new_name2;
tree arg;
+ gimple_stmt_iterator gsi;
/* Create new bb between loop and new_merge_bb. */
- *new_exit_bb = split_edge (loop->single_exit);
+ *new_exit_bb = split_edge (single_exit (loop));
new_exit_e = EDGE_SUCC (*new_exit_bb, 0);
- for (update_phi = phi_nodes (update_bb); update_phi;
- update_phi = PHI_CHAIN (update_phi))
+ for (gsi = gsi_start_phis (update_bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
+ update_phi = gsi_stmt (gsi);
orig_phi = update_phi;
orig_def = PHI_ARG_DEF_FROM_EDGE (orig_phi, e);
/* This loop-closed-phi actually doesn't represent a use
*new_exit_bb);
/* 2.2. NEW_EXIT_BB has one incoming edge: the exit-edge of the loop. */
- add_phi_arg (new_phi, loop_arg, loop->single_exit);
+ add_phi_arg (new_phi, loop_arg, single_exit (loop));
/* 2.3. Update phi in successor of NEW_EXIT_BB: */
gcc_assert (PHI_ARG_DEF_FROM_EDGE (update_phi2, new_exit_e) == loop_arg);
== guard_arg);
SET_PHI_ARG_DEF (update_phi2, guard_edge->dest_idx, PHI_RESULT (new_phi));
}
-
- set_phi_nodes (new_merge_bb, phi_reverse (phi_nodes (new_merge_bb)));
}
void
slpeel_make_loop_iterate_ntimes (struct loop *loop, tree niters)
{
- tree indx_before_incr, indx_after_incr, cond_stmt, cond;
- tree orig_cond;
- edge exit_edge = loop->single_exit;
- block_stmt_iterator loop_cond_bsi;
- block_stmt_iterator incr_bsi;
+ tree indx_before_incr, indx_after_incr;
+ gimple cond_stmt;
+ gimple orig_cond;
+ edge exit_edge = single_exit (loop);
+ gimple_stmt_iterator loop_cond_gsi;
+ gimple_stmt_iterator incr_gsi;
bool insert_after;
- tree begin_label = tree_block_label (loop->latch);
- tree exit_label = tree_block_label (loop->single_exit->dest);
tree init = build_int_cst (TREE_TYPE (niters), 0);
tree step = build_int_cst (TREE_TYPE (niters), 1);
- tree then_label;
- tree else_label;
LOC loop_loc;
+ enum tree_code code;
orig_cond = get_loop_exit_condition (loop);
gcc_assert (orig_cond);
- loop_cond_bsi = bsi_for_stmt (orig_cond);
+ loop_cond_gsi = gsi_for_stmt (orig_cond);
- standard_iv_increment_position (loop, &incr_bsi, &insert_after);
+ standard_iv_increment_position (loop, &incr_gsi, &insert_after);
create_iv (init, step, NULL_TREE, loop,
- &incr_bsi, insert_after, &indx_before_incr, &indx_after_incr);
+ &incr_gsi, insert_after, &indx_before_incr, &indx_after_incr);
- if (exit_edge->flags & EDGE_TRUE_VALUE) /* 'then' edge exits the loop. */
- {
- cond = build2 (GE_EXPR, boolean_type_node, indx_after_incr, niters);
- then_label = build1 (GOTO_EXPR, void_type_node, exit_label);
- else_label = build1 (GOTO_EXPR, void_type_node, begin_label);
- }
- else /* 'then' edge loops back. */
- {
- cond = build2 (LT_EXPR, boolean_type_node, indx_after_incr, niters);
- then_label = build1 (GOTO_EXPR, void_type_node, begin_label);
- else_label = build1 (GOTO_EXPR, void_type_node, exit_label);
- }
+ indx_after_incr = force_gimple_operand_gsi (&loop_cond_gsi, indx_after_incr,
+ true, NULL_TREE, true,
+ GSI_SAME_STMT);
+ niters = force_gimple_operand_gsi (&loop_cond_gsi, niters, true, NULL_TREE,
+ true, GSI_SAME_STMT);
- cond_stmt = build3 (COND_EXPR, TREE_TYPE (orig_cond), cond,
- then_label, else_label);
- bsi_insert_before (&loop_cond_bsi, cond_stmt, BSI_SAME_STMT);
+ code = (exit_edge->flags & EDGE_TRUE_VALUE) ? GE_EXPR : LT_EXPR;
+ cond_stmt = gimple_build_cond (code, indx_after_incr, niters, NULL_TREE,
+ NULL_TREE);
+
+ gsi_insert_before (&loop_cond_gsi, cond_stmt, GSI_SAME_STMT);
/* Remove old loop exit test: */
- bsi_remove (&loop_cond_bsi, true);
+ gsi_remove (&loop_cond_gsi, true);
loop_loc = find_loop_location (loop);
if (dump_file && (dump_flags & TDF_DETAILS))
if (loop_loc != UNKNOWN_LOC)
fprintf (dump_file, "\nloop at %s:%d: ",
LOC_FILE (loop_loc), LOC_LINE (loop_loc));
- print_generic_expr (dump_file, cond_stmt, TDF_SLIM);
+ print_gimple_stmt (dump_file, cond_stmt, 0, TDF_SLIM);
}
loop->nb_iterations = niters;
/* Given LOOP this function generates a new copy of it and puts it
on E which is either the entry or exit of LOOP. */
-static struct loop *
-slpeel_tree_duplicate_loop_to_edge_cfg (struct loop *loop, struct loops *loops,
- edge e)
+struct loop *
+slpeel_tree_duplicate_loop_to_edge_cfg (struct loop *loop, edge e)
{
struct loop *new_loop;
basic_block *new_bbs, *bbs;
bool at_exit;
bool was_imm_dom;
basic_block exit_dest;
- tree phi, phi_arg;
+ gimple phi;
+ tree phi_arg;
+ edge exit, new_exit;
+ gimple_stmt_iterator gsi;
- at_exit = (e == loop->single_exit);
+ at_exit = (e == single_exit (loop));
if (!at_exit && e != loop_preheader_edge (loop))
return NULL;
}
/* Generate new loop structure. */
- new_loop = duplicate_loop (loops, loop, loop->outer);
+ new_loop = duplicate_loop (loop, loop_outer (loop));
if (!new_loop)
{
free (bbs);
return NULL;
}
- exit_dest = loop->single_exit->dest;
+ exit_dest = single_exit (loop)->dest;
was_imm_dom = (get_immediate_dominator (CDI_DOMINATORS,
exit_dest) == loop->header ?
true : false);
new_bbs = XNEWVEC (basic_block, loop->num_nodes);
+ exit = single_exit (loop);
copy_bbs (bbs, loop->num_nodes, new_bbs,
- &loop->single_exit, 1, &new_loop->single_exit, NULL,
+ &exit, 1, &new_exit, NULL,
e->src);
/* Duplicating phi args at exit bbs as coming
also from exit of duplicated loop. */
- for (phi = phi_nodes (exit_dest); phi; phi = PHI_CHAIN (phi))
+ for (gsi = gsi_start_phis (exit_dest); !gsi_end_p (gsi); gsi_next (&gsi))
{
- phi_arg = PHI_ARG_DEF_FROM_EDGE (phi, loop->single_exit);
+ phi = gsi_stmt (gsi);
+ phi_arg = PHI_ARG_DEF_FROM_EDGE (phi, single_exit (loop));
if (phi_arg)
{
edge new_loop_exit_edge;
if (at_exit) /* Add the loop copy at exit. */
{
redirect_edge_and_branch_force (e, new_loop->header);
+ PENDING_STMT (e) = NULL;
set_immediate_dominator (CDI_DOMINATORS, new_loop->header, e->src);
if (was_imm_dom)
set_immediate_dominator (CDI_DOMINATORS, exit_dest, new_loop->header);
new_exit_e = EDGE_SUCC (new_loop->header, 1);
redirect_edge_and_branch_force (new_exit_e, loop->header);
+ PENDING_STMT (new_exit_e) = NULL;
set_immediate_dominator (CDI_DOMINATORS, loop->header,
new_exit_e->src);
/* We have to add phi args to the loop->header here as coming
from new_exit_e edge. */
- for (phi = phi_nodes (loop->header); phi; phi = PHI_CHAIN (phi))
+ for (gsi = gsi_start_phis (loop->header);
+ !gsi_end_p (gsi);
+ gsi_next (&gsi))
{
+ phi = gsi_stmt (gsi);
phi_arg = PHI_ARG_DEF_FROM_EDGE (phi, entry_e);
if (phi_arg)
add_phi_arg (phi, phi_arg, new_exit_e);
}
redirect_edge_and_branch_force (entry_e, new_loop->header);
+ PENDING_STMT (entry_e) = NULL;
set_immediate_dominator (CDI_DOMINATORS, new_loop->header, preheader);
}
static edge
slpeel_add_loop_guard (basic_block guard_bb, tree cond, basic_block exit_bb,
- basic_block dom_bb)
+ basic_block dom_bb)
{
- block_stmt_iterator bsi;
+ gimple_stmt_iterator gsi;
edge new_e, enter_e;
- tree cond_stmt, then_label, else_label;
+ gimple cond_stmt;
+ gimple_seq gimplify_stmt_list = NULL;
enter_e = EDGE_SUCC (guard_bb, 0);
enter_e->flags &= ~EDGE_FALLTHRU;
enter_e->flags |= EDGE_FALSE_VALUE;
- bsi = bsi_last (guard_bb);
-
- then_label = build1 (GOTO_EXPR, void_type_node,
- tree_block_label (exit_bb));
- else_label = build1 (GOTO_EXPR, void_type_node,
- tree_block_label (enter_e->dest));
- cond_stmt = build3 (COND_EXPR, void_type_node, cond,
- then_label, else_label);
- bsi_insert_after (&bsi, cond_stmt, BSI_NEW_STMT);
+ gsi = gsi_last_bb (guard_bb);
+
+ cond = force_gimple_operand (cond, &gimplify_stmt_list, true, NULL_TREE);
+ cond_stmt = gimple_build_cond (NE_EXPR,
+ cond, build_int_cst (TREE_TYPE (cond), 0),
+ NULL_TREE, NULL_TREE);
+ if (gimplify_stmt_list)
+ gsi_insert_seq_after (&gsi, gimplify_stmt_list, GSI_NEW_STMT);
+
+ gsi = gsi_last_bb (guard_bb);
+ gsi_insert_after (&gsi, cond_stmt, GSI_NEW_STMT);
+
/* Add new edge to connect guard block to the merge/loop-exit block. */
new_e = make_edge (guard_bb, exit_bb, EDGE_TRUE_VALUE);
set_immediate_dominator (CDI_DOMINATORS, exit_bb, dom_bb);
*/
bool
-slpeel_can_duplicate_loop_p (struct loop *loop, edge e)
+slpeel_can_duplicate_loop_p (const struct loop *loop, const_edge e)
{
- edge exit_e = loop->single_exit;
+ edge exit_e = single_exit (loop);
edge entry_e = loop_preheader_edge (loop);
- tree orig_cond = get_loop_exit_condition (loop);
- block_stmt_iterator loop_exit_bsi = bsi_last (exit_e->src);
+ gimple orig_cond = get_loop_exit_condition (loop);
+ gimple_stmt_iterator loop_exit_gsi = gsi_last_bb (exit_e->src);
if (need_ssa_update_p ())
return false;
if (loop->inner
/* All loops have an outer scope; the only case loop->outer is NULL is for
the function itself. */
- || !loop->outer
+ || !loop_outer (loop)
|| loop->num_nodes != 2
|| !empty_block_p (loop->latch)
- || !loop->single_exit
+ || !single_exit (loop)
/* Verify that new loop exit condition can be trivially modified. */
- || (!orig_cond || orig_cond != bsi_stmt (loop_exit_bsi))
+ || (!orig_cond || orig_cond != gsi_stmt (loop_exit_gsi))
|| (e != exit_e && e != entry_e))
return false;
slpeel_verify_cfg_after_peeling (struct loop *first_loop,
struct loop *second_loop)
{
- basic_block loop1_exit_bb = first_loop->single_exit->dest;
+ basic_block loop1_exit_bb = single_exit (first_loop)->dest;
basic_block loop2_entry_bb = loop_preheader_edge (second_loop)->src;
basic_block loop1_entry_bb = loop_preheader_edge (first_loop)->src;
/* A guard that controls whether the second_loop is to be executed or skipped
- is placed in first_loop->exit. first_loopt->exit therefore has two
+ is placed in first_loop->exit. first_loop->exit therefore has two
successors - one is the preheader of second_loop, and the other is a bb
after second_loop.
*/
gcc_assert (EDGE_COUNT (loop1_exit_bb->succs) == 2);
- /* 1. Verify that one of the successors of first_loopt->exit is the preheader
+ /* 1. Verify that one of the successors of first_loop->exit is the preheader
of second_loop. */
/* The preheader of new_loop is expected to have two predecessors:
|| (EDGE_PRED (loop2_entry_bb, 1)->src == loop1_exit_bb
&& EDGE_PRED (loop2_entry_bb, 0)->src == loop1_entry_bb)));
- /* Verify that the other successor of first_loopt->exit is after the
+ /* Verify that the other successor of first_loop->exit is after the
second_loop. */
/* TODO */
}
#endif
+/* If the run time cost model check determines that vectorization is
+ not profitable and hence scalar loop should be generated then set
+ FIRST_NITERS to prologue peeled iterations. This will allow all the
+ iterations to be executed in the prologue peeled scalar loop. */
+
+void
+set_prologue_iterations (basic_block bb_before_first_loop,
+ tree first_niters,
+ struct loop *loop,
+ unsigned int th)
+{
+ edge e;
+ basic_block cond_bb, then_bb;
+ tree var, prologue_after_cost_adjust_name;
+ gimple_stmt_iterator gsi;
+ gimple newphi;
+ edge e_true, e_false, e_fallthru;
+ gimple cond_stmt;
+ gimple_seq gimplify_stmt_list = NULL, stmts = NULL;
+ tree cost_pre_condition = NULL_TREE;
+ tree scalar_loop_iters =
+ unshare_expr (LOOP_VINFO_NITERS_UNCHANGED (loop_vec_info_for_loop (loop)));
+
+ e = single_pred_edge (bb_before_first_loop);
+ cond_bb = split_edge(e);
+
+ e = single_pred_edge (bb_before_first_loop);
+ then_bb = split_edge(e);
+ set_immediate_dominator (CDI_DOMINATORS, then_bb, cond_bb);
+
+ e_false = make_single_succ_edge (cond_bb, bb_before_first_loop,
+ EDGE_FALSE_VALUE);
+ set_immediate_dominator (CDI_DOMINATORS, bb_before_first_loop, cond_bb);
+
+ e_true = EDGE_PRED (then_bb, 0);
+ e_true->flags &= ~EDGE_FALLTHRU;
+ e_true->flags |= EDGE_TRUE_VALUE;
+
+ e_fallthru = EDGE_SUCC (then_bb, 0);
+
+ cost_pre_condition =
+ build2 (LE_EXPR, boolean_type_node, scalar_loop_iters,
+ build_int_cst (TREE_TYPE (scalar_loop_iters), th));
+ cost_pre_condition =
+ force_gimple_operand (cost_pre_condition, &gimplify_stmt_list,
+ true, NULL_TREE);
+ cond_stmt = gimple_build_cond (NE_EXPR, cost_pre_condition,
+ build_int_cst (TREE_TYPE (cost_pre_condition),
+ 0), NULL_TREE, NULL_TREE);
+
+ gsi = gsi_last_bb (cond_bb);
+ if (gimplify_stmt_list)
+ gsi_insert_seq_after (&gsi, gimplify_stmt_list, GSI_NEW_STMT);
+
+ gsi = gsi_last_bb (cond_bb);
+ gsi_insert_after (&gsi, cond_stmt, GSI_NEW_STMT);
+
+ var = create_tmp_var (TREE_TYPE (scalar_loop_iters),
+ "prologue_after_cost_adjust");
+ add_referenced_var (var);
+ prologue_after_cost_adjust_name =
+ force_gimple_operand (scalar_loop_iters, &stmts, false, var);
+
+ gsi = gsi_last_bb (then_bb);
+ if (stmts)
+ gsi_insert_seq_after (&gsi, stmts, GSI_NEW_STMT);
+
+ newphi = create_phi_node (var, bb_before_first_loop);
+ add_phi_arg (newphi, prologue_after_cost_adjust_name, e_fallthru);
+ add_phi_arg (newphi, first_niters, e_false);
+
+ first_niters = PHI_RESULT (newphi);
+}
+
+
/* Function slpeel_tree_peel_loop_to_edge.
Peel the first (last) iterations of LOOP into a new prolog (epilog) loop
that is placed on the entry (exit) edge E of LOOP. After this transformation
we have two loops one after the other - first-loop iterates FIRST_NITERS
times, and second-loop iterates the remainder NITERS - FIRST_NITERS times.
+ If the cost model indicates that it is profitable to emit a scalar
+ loop instead of the vector one, then the prolog (epilog) loop will iterate
+ for the entire unchanged scalar iterations of the loop.
Input:
- LOOP: the loop to be peeled.
for updating the loop bound of the first-loop to FIRST_NITERS. If it
is false, the caller of this function may want to take care of this
(this can be useful if we don't want new stmts added to first-loop).
+ - TH: cost model profitability threshold of iterations for vectorization.
+ - CHECK_PROFITABILITY: specify whether cost model check has not occurred
+ during versioning and hence needs to occur during
+ prologue generation or whether cost model check
+ has not occurred during prologue generation and hence
+ needs to occur during epilogue generation.
+
Output:
The function returns a pointer to the new loop-copy, or NULL if it failed
*/
struct loop*
-slpeel_tree_peel_loop_to_edge (struct loop *loop, struct loops *loops,
+slpeel_tree_peel_loop_to_edge (struct loop *loop,
edge e, tree first_niters,
- tree niters, bool update_first_loop_count)
+ tree niters, bool update_first_loop_count,
+ unsigned int th, bool check_profitability)
{
struct loop *new_loop = NULL, *first_loop, *second_loop;
edge skip_e;
- tree pre_condition;
+ tree pre_condition = NULL_TREE;
bitmap definitions;
basic_block bb_before_second_loop, bb_after_second_loop;
basic_block bb_before_first_loop;
basic_block bb_between_loops;
basic_block new_exit_bb;
- edge exit_e = loop->single_exit;
+ edge exit_e = single_exit (loop);
LOC loop_loc;
+ tree cost_pre_condition = NULL_TREE;
if (!slpeel_can_duplicate_loop_p (loop, e))
return NULL;
cfg_hooks->split_edge, the function tree_split_edge
is actually called and, when calling cfg_hooks->duplicate_block,
the function tree_duplicate_bb is called. */
- tree_register_cfg_hooks ();
+ gimple_register_cfg_hooks ();
/* 1. Generate a copy of LOOP and put it on E (E is the entry/exit of LOOP).
orig_exit_bb:
*/
- if (!(new_loop = slpeel_tree_duplicate_loop_to_edge_cfg (loop, loops, e)))
+ if (!(new_loop = slpeel_tree_duplicate_loop_to_edge_cfg (loop, e)))
{
loop_loc = find_loop_location (loop);
if (dump_file && (dump_flags & TDF_DETAILS))
rename_variables_in_loop (new_loop);
- /* 2. Add the guard that controls whether the first loop is executed.
- Resulting CFG would be:
+ /* 2. Add the guard code in one of the following ways:
- bb_before_first_loop:
- if (FIRST_NITERS == 0) GOTO bb_before_second_loop
- GOTO first-loop
+ 2.a Add the guard that controls whether the first loop is executed.
+ This occurs when this function is invoked for prologue or epilogue
+ generation and when the cost model check can be done at compile time.
- first_loop:
- do {
- } while ...
+ Resulting CFG would be:
- bb_before_second_loop:
+ bb_before_first_loop:
+ if (FIRST_NITERS == 0) GOTO bb_before_second_loop
+ GOTO first-loop
- second_loop:
- do {
- } while ...
+ first_loop:
+ do {
+ } while ...
- orig_exit_bb:
- */
+ bb_before_second_loop:
+
+ second_loop:
+ do {
+ } while ...
+
+ orig_exit_bb:
+
+ 2.b Add the cost model check that allows the prologue
+ to iterate for the entire unchanged scalar
+ iterations of the loop in the event that the cost
+ model indicates that the scalar loop is more
+ profitable than the vector one. This occurs when
+ this function is invoked for prologue generation
+ and the cost model check needs to be done at run
+ time.
+
+ Resulting CFG after prologue peeling would be:
+
+ if (scalar_loop_iterations <= th)
+ FIRST_NITERS = scalar_loop_iterations
+
+ bb_before_first_loop:
+ if (FIRST_NITERS == 0) GOTO bb_before_second_loop
+ GOTO first-loop
+
+ first_loop:
+ do {
+ } while ...
+
+ bb_before_second_loop:
+
+ second_loop:
+ do {
+ } while ...
+
+ orig_exit_bb:
+
+ 2.c Add the cost model check that allows the epilogue
+ to iterate for the entire unchanged scalar
+ iterations of the loop in the event that the cost
+ model indicates that the scalar loop is more
+ profitable than the vector one. This occurs when
+ this function is invoked for epilogue generation
+ and the cost model check needs to be done at run
+ time.
+
+ Resulting CFG after prologue peeling would be:
+
+ bb_before_first_loop:
+ if ((scalar_loop_iterations <= th)
+ ||
+ FIRST_NITERS == 0) GOTO bb_before_second_loop
+ GOTO first-loop
+
+ first_loop:
+ do {
+ } while ...
+
+ bb_before_second_loop:
+
+ second_loop:
+ do {
+ } while ...
+
+ orig_exit_bb:
+ */
bb_before_first_loop = split_edge (loop_preheader_edge (first_loop));
- bb_before_second_loop = split_edge (first_loop->single_exit);
+ bb_before_second_loop = split_edge (single_exit (first_loop));
+
+ /* Epilogue peeling. */
+ if (!update_first_loop_count)
+ {
+ pre_condition =
+ fold_build2 (LE_EXPR, boolean_type_node, first_niters,
+ build_int_cst (TREE_TYPE (first_niters), 0));
+ if (check_profitability)
+ {
+ tree scalar_loop_iters
+ = unshare_expr (LOOP_VINFO_NITERS_UNCHANGED
+ (loop_vec_info_for_loop (loop)));
+ cost_pre_condition =
+ build2 (LE_EXPR, boolean_type_node, scalar_loop_iters,
+ build_int_cst (TREE_TYPE (scalar_loop_iters), th));
+
+ pre_condition = fold_build2 (TRUTH_OR_EXPR, boolean_type_node,
+ cost_pre_condition, pre_condition);
+ }
+ }
+
+ /* Prologue peeling. */
+ else
+ {
+ if (check_profitability)
+ set_prologue_iterations (bb_before_first_loop, first_niters,
+ loop, th);
+
+ pre_condition =
+ fold_build2 (LE_EXPR, boolean_type_node, first_niters,
+ build_int_cst (TREE_TYPE (first_niters), 0));
+ }
- pre_condition =
- fold_build2 (LE_EXPR, boolean_type_node, first_niters,
- build_int_cst (TREE_TYPE (first_niters), 0));
skip_e = slpeel_add_loop_guard (bb_before_first_loop, pre_condition,
bb_before_second_loop, bb_before_first_loop);
slpeel_update_phi_nodes_for_guard1 (skip_e, first_loop,
*/
bb_between_loops = new_exit_bb;
- bb_after_second_loop = split_edge (second_loop->single_exit);
+ bb_after_second_loop = split_edge (single_exit (second_loop));
pre_condition =
fold_build2 (EQ_EXPR, boolean_type_node, first_niters, niters);
LOC
find_loop_location (struct loop *loop)
{
- tree node = NULL_TREE;
+ gimple stmt = NULL;
basic_block bb;
- block_stmt_iterator si;
+ gimple_stmt_iterator si;
if (!loop)
return UNKNOWN_LOC;
- node = get_loop_exit_condition (loop);
+ stmt = get_loop_exit_condition (loop);
- if (node && EXPR_P (node) && EXPR_HAS_LOCATION (node)
- && EXPR_FILENAME (node) && EXPR_LINENO (node))
- return EXPR_LOC (node);
+ if (stmt && gimple_location (stmt) != UNKNOWN_LOC)
+ return gimple_location (stmt);
/* If we got here the loop is probably not "well formed",
try to estimate the loop location */
bb = loop->header;
- for (si = bsi_start (bb); !bsi_end_p (si); bsi_next (&si))
+ for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
{
- node = bsi_stmt (si);
- if (node && EXPR_P (node) && EXPR_HAS_LOCATION (node))
- return EXPR_LOC (node);
+ stmt = gsi_stmt (si);
+ if (gimple_location (stmt) != UNKNOWN_LOC)
+ return gimple_location (stmt);
}
return UNKNOWN_LOC;
Create and initialize a new stmt_vec_info struct for STMT. */
stmt_vec_info
-new_stmt_vec_info (tree stmt, loop_vec_info loop_vinfo)
+new_stmt_vec_info (gimple stmt, loop_vec_info loop_vinfo)
{
stmt_vec_info res;
res = (stmt_vec_info) xcalloc (1, sizeof (struct _stmt_vec_info));
STMT_VINFO_IN_PATTERN_P (res) = false;
STMT_VINFO_RELATED_STMT (res) = NULL;
STMT_VINFO_DATA_REF (res) = NULL;
- if (TREE_CODE (stmt) == PHI_NODE)
+
+ STMT_VINFO_DR_BASE_ADDRESS (res) = NULL;
+ STMT_VINFO_DR_OFFSET (res) = NULL;
+ STMT_VINFO_DR_INIT (res) = NULL;
+ STMT_VINFO_DR_STEP (res) = NULL;
+ STMT_VINFO_DR_ALIGNED_TO (res) = NULL;
+
+ if (gimple_code (stmt) == GIMPLE_PHI
+ && is_loop_header_bb_p (gimple_bb (stmt)))
STMT_VINFO_DEF_TYPE (res) = vect_unknown_def_type;
else
STMT_VINFO_DEF_TYPE (res) = vect_loop_def;
STMT_VINFO_SAME_ALIGN_REFS (res) = VEC_alloc (dr_p, heap, 5);
+ STMT_VINFO_INSIDE_OF_LOOP_COST (res) = 0;
+ STMT_VINFO_OUTSIDE_OF_LOOP_COST (res) = 0;
+ STMT_SLP_TYPE (res) = 0;
+ DR_GROUP_FIRST_DR (res) = NULL;
+ DR_GROUP_NEXT_DR (res) = NULL;
+ DR_GROUP_SIZE (res) = 0;
+ DR_GROUP_STORE_COUNT (res) = 0;
+ DR_GROUP_GAP (res) = 0;
+ DR_GROUP_SAME_DR_STMT (res) = NULL;
+ DR_GROUP_READ_WRITE_DEPENDENCE (res) = false;
return res;
}
+/* Create a hash table for stmt_vec_info. */
+
+void
+init_stmt_vec_info_vec (void)
+{
+ gcc_assert (!stmt_vec_info_vec);
+ stmt_vec_info_vec = VEC_alloc (vec_void_p, heap, 50);
+}
+
+/* Free hash table for stmt_vec_info. */
+
+void
+free_stmt_vec_info_vec (void)
+{
+ gcc_assert (stmt_vec_info_vec);
+ VEC_free (vec_void_p, heap, stmt_vec_info_vec);
+}
+
+/* Free stmt vectorization related info. */
+
+void
+free_stmt_vec_info (gimple stmt)
+{
+ stmt_vec_info stmt_info = vinfo_for_stmt (stmt);
+
+ if (!stmt_info)
+ return;
+
+ VEC_free (dr_p, heap, STMT_VINFO_SAME_ALIGN_REFS (stmt_info));
+ set_vinfo_for_stmt (stmt, NULL);
+ free (stmt_info);
+}
+
+
+/* Function bb_in_loop_p
+
+ Used as predicate for dfs order traversal of the loop bbs. */
+
+static bool
+bb_in_loop_p (const_basic_block bb, const void *data)
+{
+ const struct loop *const loop = (const struct loop *)data;
+ if (flow_bb_inside_loop_p (loop, bb))
+ return true;
+ return false;
+}
+
/* Function new_loop_vec_info.
{
loop_vec_info res;
basic_block *bbs;
- block_stmt_iterator si;
- unsigned int i;
+ gimple_stmt_iterator si;
+ unsigned int i, nbbs;
res = (loop_vec_info) xcalloc (1, sizeof (struct _loop_vec_info));
+ LOOP_VINFO_LOOP (res) = loop;
bbs = get_loop_body (loop);
- /* Create stmt_info for all stmts in the loop. */
+ /* Create/Update stmt_info for all stmts in the loop. */
for (i = 0; i < loop->num_nodes; i++)
{
basic_block bb = bbs[i];
- tree phi;
- for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
- {
- stmt_ann_t ann = get_stmt_ann (phi);
- set_stmt_info (ann, new_stmt_vec_info (phi, res));
- }
-
- for (si = bsi_start (bb); !bsi_end_p (si); bsi_next (&si))
+ /* BBs in a nested inner-loop will have been already processed (because
+ we will have called vect_analyze_loop_form for any nested inner-loop).
+ Therefore, for stmts in an inner-loop we just want to update the
+ STMT_VINFO_LOOP_VINFO field of their stmt_info to point to the new
+ loop_info of the outer-loop we are currently considering to vectorize
+ (instead of the loop_info of the inner-loop).
+ For stmts in other BBs we need to create a stmt_info from scratch. */
+ if (bb->loop_father != loop)
+ {
+ /* Inner-loop bb. */
+ gcc_assert (loop->inner && bb->loop_father == loop->inner);
+ for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
+ {
+ gimple phi = gsi_stmt (si);
+ stmt_vec_info stmt_info = vinfo_for_stmt (phi);
+ loop_vec_info inner_loop_vinfo =
+ STMT_VINFO_LOOP_VINFO (stmt_info);
+ gcc_assert (loop->inner == LOOP_VINFO_LOOP (inner_loop_vinfo));
+ STMT_VINFO_LOOP_VINFO (stmt_info) = res;
+ }
+ for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
+ {
+ gimple stmt = gsi_stmt (si);
+ stmt_vec_info stmt_info = vinfo_for_stmt (stmt);
+ loop_vec_info inner_loop_vinfo =
+ STMT_VINFO_LOOP_VINFO (stmt_info);
+ gcc_assert (loop->inner == LOOP_VINFO_LOOP (inner_loop_vinfo));
+ STMT_VINFO_LOOP_VINFO (stmt_info) = res;
+ }
+ }
+ else
{
- tree stmt = bsi_stmt (si);
- stmt_ann_t ann;
+ /* bb in current nest. */
+ for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
+ {
+ gimple phi = gsi_stmt (si);
+ gimple_set_uid (phi, 0);
+ set_vinfo_for_stmt (phi, new_stmt_vec_info (phi, res));
+ }
- ann = stmt_ann (stmt);
- set_stmt_info (ann, new_stmt_vec_info (stmt, res));
+ for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
+ {
+ gimple stmt = gsi_stmt (si);
+ gimple_set_uid (stmt, 0);
+ set_vinfo_for_stmt (stmt, new_stmt_vec_info (stmt, res));
+ }
}
}
- LOOP_VINFO_LOOP (res) = loop;
+ /* CHECKME: We want to visit all BBs before their successors (except for
+ latch blocks, for which this assertion wouldn't hold). In the simple
+ case of the loop forms we allow, a dfs order of the BBs would the same
+ as reversed postorder traversal, so we are safe. */
+
+ free (bbs);
+ bbs = XCNEWVEC (basic_block, loop->num_nodes);
+ nbbs = dfs_enumerate_from (loop->header, 0, bb_in_loop_p,
+ bbs, loop->num_nodes, loop);
+ gcc_assert (nbbs == loop->num_nodes);
+
LOOP_VINFO_BBS (res) = bbs;
- LOOP_VINFO_EXIT_COND (res) = NULL;
LOOP_VINFO_NITERS (res) = NULL;
+ LOOP_VINFO_NITERS_UNCHANGED (res) = NULL;
+ LOOP_VINFO_COST_MODEL_MIN_ITERS (res) = 0;
LOOP_VINFO_VECTORIZABLE_P (res) = 0;
LOOP_PEELING_FOR_ALIGNMENT (res) = 0;
LOOP_VINFO_VECT_FACTOR (res) = 0;
LOOP_VINFO_DATAREFS (res) = VEC_alloc (data_reference_p, heap, 10);
LOOP_VINFO_DDRS (res) = VEC_alloc (ddr_p, heap, 10 * 10);
LOOP_VINFO_UNALIGNED_DR (res) = NULL;
- LOOP_VINFO_MAY_MISALIGN_STMTS (res)
- = VEC_alloc (tree, heap, PARAM_VALUE (PARAM_VECT_MAX_VERSION_CHECKS));
+ LOOP_VINFO_MAY_MISALIGN_STMTS (res) =
+ VEC_alloc (gimple, heap,
+ PARAM_VALUE (PARAM_VECT_MAX_VERSION_FOR_ALIGNMENT_CHECKS));
+ LOOP_VINFO_MAY_ALIAS_DDRS (res) =
+ VEC_alloc (ddr_p, heap,
+ PARAM_VALUE (PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS));
+ LOOP_VINFO_STRIDED_STORES (res) = VEC_alloc (gimple, heap, 10);
+ LOOP_VINFO_SLP_INSTANCES (res) = VEC_alloc (slp_instance, heap, 10);
+ LOOP_VINFO_SLP_UNROLLING_FACTOR (res) = 1;
return res;
}
stmts in the loop. */
void
-destroy_loop_vec_info (loop_vec_info loop_vinfo)
+destroy_loop_vec_info (loop_vec_info loop_vinfo, bool clean_stmts)
{
struct loop *loop;
basic_block *bbs;
int nbbs;
- block_stmt_iterator si;
+ gimple_stmt_iterator si;
int j;
+ VEC (slp_instance, heap) *slp_instances;
+ slp_instance instance;
if (!loop_vinfo)
return;
bbs = LOOP_VINFO_BBS (loop_vinfo);
nbbs = loop->num_nodes;
+ if (!clean_stmts)
+ {
+ free (LOOP_VINFO_BBS (loop_vinfo));
+ free_data_refs (LOOP_VINFO_DATAREFS (loop_vinfo));
+ free_dependence_relations (LOOP_VINFO_DDRS (loop_vinfo));
+ VEC_free (gimple, heap, LOOP_VINFO_MAY_MISALIGN_STMTS (loop_vinfo));
+
+ free (loop_vinfo);
+ loop->aux = NULL;
+ return;
+ }
+
for (j = 0; j < nbbs; j++)
{
basic_block bb = bbs[j];
- tree phi;
- stmt_vec_info stmt_info;
- for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
- {
- stmt_ann_t ann = stmt_ann (phi);
-
- stmt_info = vinfo_for_stmt (phi);
- free (stmt_info);
- set_stmt_info (ann, NULL);
- }
+ for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
+ free_stmt_vec_info (gsi_stmt (si));
- for (si = bsi_start (bb); !bsi_end_p (si); )
+ for (si = gsi_start_bb (bb); !gsi_end_p (si); )
{
- tree stmt = bsi_stmt (si);
- stmt_ann_t ann = stmt_ann (stmt);
+ gimple stmt = gsi_stmt (si);
stmt_vec_info stmt_info = vinfo_for_stmt (stmt);
if (stmt_info)
/* Check if this is a "pattern stmt" (introduced by the
vectorizer during the pattern recognition pass). */
bool remove_stmt_p = false;
- tree orig_stmt = STMT_VINFO_RELATED_STMT (stmt_info);
+ gimple orig_stmt = STMT_VINFO_RELATED_STMT (stmt_info);
if (orig_stmt)
{
stmt_vec_info orig_stmt_info = vinfo_for_stmt (orig_stmt);
}
/* Free stmt_vec_info. */
- VEC_free (dr_p, heap, STMT_VINFO_SAME_ALIGN_REFS (stmt_info));
- free (stmt_info);
- set_stmt_info (ann, NULL);
+ free_stmt_vec_info (stmt);
/* Remove dead "pattern stmts". */
if (remove_stmt_p)
- bsi_remove (&si, true);
+ gsi_remove (&si, true);
}
- bsi_next (&si);
+ gsi_next (&si);
}
}
free (LOOP_VINFO_BBS (loop_vinfo));
free_data_refs (LOOP_VINFO_DATAREFS (loop_vinfo));
free_dependence_relations (LOOP_VINFO_DDRS (loop_vinfo));
- VEC_free (tree, heap, LOOP_VINFO_MAY_MISALIGN_STMTS (loop_vinfo));
+ VEC_free (gimple, heap, LOOP_VINFO_MAY_MISALIGN_STMTS (loop_vinfo));
+ VEC_free (ddr_p, heap, LOOP_VINFO_MAY_ALIAS_DDRS (loop_vinfo));
+ slp_instances = LOOP_VINFO_SLP_INSTANCES (loop_vinfo);
+ for (j = 0; VEC_iterate (slp_instance, slp_instances, j, instance); j++)
+ vect_free_slp_instance (instance);
+
+ VEC_free (slp_instance, heap, LOOP_VINFO_SLP_INSTANCES (loop_vinfo));
+ VEC_free (gimple, heap, LOOP_VINFO_STRIDED_STORES (loop_vinfo));
free (loop_vinfo);
+ loop->aux = NULL;
}
on ALIGNMENT bit boundary. */
bool
-vect_can_force_dr_alignment_p (tree decl, unsigned int alignment)
+vect_can_force_dr_alignment_p (const_tree decl, unsigned int alignment)
{
if (TREE_CODE (decl) != VAR_DECL)
return false;
if (TREE_STATIC (decl))
return (alignment <= MAX_OFILE_ALIGNMENT);
else
- /* This is not 100% correct. The absolute correct stack alignment
- is STACK_BOUNDARY. We're supposed to hope, but not assume, that
- PREFERRED_STACK_BOUNDARY is honored by all translation units.
- However, until someone implements forced stack alignment, SSE
- isn't really usable without this. */
- return (alignment <= PREFERRED_STACK_BOUNDARY);
+ return (alignment <= MAX_STACK_ALIGNMENT);
}
int nunits;
tree vectype;
- if (nbytes == 0 || nbytes >= UNITS_PER_SIMD_WORD)
+ if (nbytes == 0 || nbytes >= UNITS_PER_SIMD_WORD (inner_mode))
return NULL_TREE;
- /* FORNOW: Only a single vector size per target (UNITS_PER_SIMD_WORD)
+ /* FORNOW: Only a single vector size per mode (UNITS_PER_SIMD_WORD)
is expected. */
- nunits = UNITS_PER_SIMD_WORD / nbytes;
+ nunits = UNITS_PER_SIMD_WORD (inner_mode) / nbytes;
vectype = build_vector_type (scalar_type, nunits);
if (vect_print_dump_info (REPORT_DETAILS))
enum dr_alignment_support
vect_supportable_dr_alignment (struct data_reference *dr)
{
- tree vectype = STMT_VINFO_VECTYPE (vinfo_for_stmt (DR_STMT (dr)));
+ gimple stmt = DR_STMT (dr);
+ stmt_vec_info stmt_info = vinfo_for_stmt (stmt);
+ tree vectype = STMT_VINFO_VECTYPE (stmt_info);
enum machine_mode mode = (int) TYPE_MODE (vectype);
+ struct loop *vect_loop = LOOP_VINFO_LOOP (STMT_VINFO_LOOP_VINFO (stmt_info));
+ bool nested_in_vect_loop = nested_in_vect_loop_p (vect_loop, stmt);
+ bool invariant_in_outerloop = false;
if (aligned_access_p (dr))
return dr_aligned;
+ if (nested_in_vect_loop)
+ {
+ tree outerloop_step = STMT_VINFO_DR_STEP (stmt_info);
+ invariant_in_outerloop =
+ (tree_int_cst_compare (outerloop_step, size_zero_node) == 0);
+ }
+
/* Possibly unaligned access. */
-
+
+ /* We can choose between using the implicit realignment scheme (generating
+ a misaligned_move stmt) and the explicit realignment scheme (generating
+ aligned loads with a REALIGN_LOAD). There are two variants to the explicit
+ realignment scheme: optimized, and unoptimized.
+ We can optimize the realignment only if the step between consecutive
+ vector loads is equal to the vector size. Since the vector memory
+ accesses advance in steps of VS (Vector Size) in the vectorized loop, it
+ is guaranteed that the misalignment amount remains the same throughout the
+ execution of the vectorized loop. Therefore, we can create the
+ "realignment token" (the permutation mask that is passed to REALIGN_LOAD)
+ at the loop preheader.
+
+ However, in the case of outer-loop vectorization, when vectorizing a
+ memory access in the inner-loop nested within the LOOP that is now being
+ vectorized, while it is guaranteed that the misalignment of the
+ vectorized memory access will remain the same in different outer-loop
+ iterations, it is *not* guaranteed that is will remain the same throughout
+ the execution of the inner-loop. This is because the inner-loop advances
+ with the original scalar step (and not in steps of VS). If the inner-loop
+ step happens to be a multiple of VS, then the misalignment remains fixed
+ and we can use the optimized realignment scheme. For example:
+
+ for (i=0; i<N; i++)
+ for (j=0; j<M; j++)
+ s += a[i+j];
+
+ When vectorizing the i-loop in the above example, the step between
+ consecutive vector loads is 1, and so the misalignment does not remain
+ fixed across the execution of the inner-loop, and the realignment cannot
+ be optimized (as illustrated in the following pseudo vectorized loop):
+
+ for (i=0; i<N; i+=4)
+ for (j=0; j<M; j++){
+ vs += vp[i+j]; // misalignment of &vp[i+j] is {0,1,2,3,0,1,2,3,...}
+ // when j is {0,1,2,3,4,5,6,7,...} respectively.
+ // (assuming that we start from an aligned address).
+ }
+
+ We therefore have to use the unoptimized realignment scheme:
+
+ for (i=0; i<N; i+=4)
+ for (j=k; j<M; j+=4)
+ vs += vp[i+j]; // misalignment of &vp[i+j] is always k (assuming
+ // that the misalignment of the initial address is
+ // 0).
+
+ The loop can then be vectorized as follows:
+
+ for (k=0; k<4; k++){
+ rt = get_realignment_token (&vp[k]);
+ for (i=0; i<N; i+=4){
+ v1 = vp[i+k];
+ for (j=k; j<M; j+=4){
+ v2 = vp[i+j+VS-1];
+ va = REALIGN_LOAD <v1,v2,rt>;
+ vs += va;
+ v1 = v2;
+ }
+ }
+ } */
+
if (DR_IS_READ (dr))
{
- if (vec_realign_load_optab->handlers[mode].insn_code != CODE_FOR_nothing
+ if (optab_handler (vec_realign_load_optab, mode)->insn_code !=
+ CODE_FOR_nothing
&& (!targetm.vectorize.builtin_mask_for_load
|| targetm.vectorize.builtin_mask_for_load ()))
- return dr_unaligned_software_pipeline;
+ {
+ tree vectype = STMT_VINFO_VECTYPE (stmt_info);
+ if (nested_in_vect_loop
+ && (TREE_INT_CST_LOW (DR_STEP (dr))
+ != GET_MODE_SIZE (TYPE_MODE (vectype))))
+ return dr_explicit_realign;
+ else
+ return dr_explicit_realign_optimized;
+ }
- if (movmisalign_optab->handlers[mode].insn_code != CODE_FOR_nothing)
+ if (optab_handler (movmisalign_optab, mode)->insn_code !=
+ CODE_FOR_nothing)
/* Can't software pipeline the loads, but can at least do them. */
return dr_unaligned_supported;
}
in reduction/induction computations). */
bool
-vect_is_simple_use (tree operand, loop_vec_info loop_vinfo, tree *def_stmt,
+vect_is_simple_use (tree operand, loop_vec_info loop_vinfo, gimple *def_stmt,
tree *def, enum vect_def_type *dt)
{
basic_block bb;
stmt_vec_info stmt_vinfo;
struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo);
- *def_stmt = NULL_TREE;
+ *def_stmt = NULL;
*def = NULL_TREE;
if (vect_print_dump_info (REPORT_DETAILS))
*dt = vect_constant_def;
return true;
}
-
+ if (is_gimple_min_invariant (operand))
+ {
+ *def = operand;
+ *dt = vect_invariant_def;
+ return true;
+ }
+
+ if (TREE_CODE (operand) == PAREN_EXPR)
+ {
+ if (vect_print_dump_info (REPORT_DETAILS))
+ fprintf (vect_dump, "non-associatable copy.");
+ operand = TREE_OPERAND (operand, 0);
+ }
if (TREE_CODE (operand) != SSA_NAME)
{
if (vect_print_dump_info (REPORT_DETAILS))
}
*def_stmt = SSA_NAME_DEF_STMT (operand);
- if (*def_stmt == NULL_TREE )
+ if (*def_stmt == NULL)
{
if (vect_print_dump_info (REPORT_DETAILS))
fprintf (vect_dump, "no def_stmt.");
if (vect_print_dump_info (REPORT_DETAILS))
{
fprintf (vect_dump, "def_stmt: ");
- print_generic_expr (vect_dump, *def_stmt, TDF_SLIM);
+ print_gimple_stmt (vect_dump, *def_stmt, 0, TDF_SLIM);
}
/* empty stmt is expected only in case of a function argument.
- (Otherwise - we expect a phi_node or a modify_expr). */
- if (IS_EMPTY_STMT (*def_stmt))
+ (Otherwise - we expect a phi_node or a GIMPLE_ASSIGN). */
+ if (gimple_nop_p (*def_stmt))
{
- tree arg = TREE_OPERAND (*def_stmt, 0);
- if (TREE_CODE (arg) == INTEGER_CST || TREE_CODE (arg) == REAL_CST)
- {
- *def = operand;
- *dt = vect_invariant_def;
- return true;
- }
-
- if (vect_print_dump_info (REPORT_DETAILS))
- fprintf (vect_dump, "Unexpected empty stmt.");
- return false;
+ *def = operand;
+ *dt = vect_invariant_def;
+ return true;
}
- bb = bb_for_stmt (*def_stmt);
+ bb = gimple_bb (*def_stmt);
if (!flow_bb_inside_loop_p (loop, bb))
*dt = vect_invariant_def;
else
return false;
}
- /* stmts inside the loop that have been identified as performing
- a reduction operation cannot have uses in the loop. */
- if (*dt == vect_reduction_def && TREE_CODE (*def_stmt) != PHI_NODE)
- {
- if (vect_print_dump_info (REPORT_DETAILS))
- fprintf (vect_dump, "reduction used in loop.");
- return false;
- }
-
if (vect_print_dump_info (REPORT_DETAILS))
fprintf (vect_dump, "type of def: %d.",*dt);
- switch (TREE_CODE (*def_stmt))
+ switch (gimple_code (*def_stmt))
{
- case PHI_NODE:
- *def = PHI_RESULT (*def_stmt);
- gcc_assert (*dt == vect_induction_def || *dt == vect_reduction_def
- || *dt == vect_invariant_def);
+ case GIMPLE_PHI:
+ *def = gimple_phi_result (*def_stmt);
break;
- case MODIFY_EXPR:
- *def = TREE_OPERAND (*def_stmt, 0);
- gcc_assert (*dt == vect_loop_def || *dt == vect_invariant_def);
+ case GIMPLE_ASSIGN:
+ *def = gimple_assign_lhs (*def_stmt);
break;
+ case GIMPLE_CALL:
+ *def = gimple_call_lhs (*def_stmt);
+ if (*def != NULL)
+ break;
+ /* FALLTHRU */
default:
if (vect_print_dump_info (REPORT_DETAILS))
fprintf (vect_dump, "unsupported defining stmt: ");
return false;
}
- if (*dt == vect_induction_def)
- {
- if (vect_print_dump_info (REPORT_DETAILS))
- fprintf (vect_dump, "induction not supported.");
- return false;
- }
-
return true;
}
widening operation that is supported by the target platform in
vector form (i.e., when operating on arguments of type VECTYPE).
- The two kinds of widening operations we currently support are
- NOP and WIDEN_MULT. This function checks if these oprations
- are supported by the target platform either directly (via vector
- tree-codes), or via target builtins.
+ Widening operations we currently support are NOP (CONVERT), FLOAT
+ and WIDEN_MULT. This function checks if these operations are supported
+ by the target platform either directly (via vector tree-codes), or via
+ target builtins.
Output:
- CODE1 and CODE2 are codes of vector operations to be used when
vectorizing the operation, if available.
- DECL1 and DECL2 are decls of target builtin functions to be used
when vectorizing the operation, if available. In this case,
- CODE1 and CODE2 are CALL_EXPR. */
+ CODE1 and CODE2 are CALL_EXPR.
+ - MULTI_STEP_CVT determines the number of required intermediate steps in
+ case of multi-step conversion (like char->short->int - in that case
+ MULTI_STEP_CVT will be 1).
+ - INTERM_TYPES contains the intermediate type required to perform the
+ widening operation (short in the above example). */
bool
-supportable_widening_operation (enum tree_code code, tree stmt, tree vectype,
+supportable_widening_operation (enum tree_code code, gimple stmt, tree vectype,
tree *decl1, tree *decl2,
- enum tree_code *code1, enum tree_code *code2)
+ enum tree_code *code1, enum tree_code *code2,
+ int *multi_step_cvt,
+ VEC (tree, heap) **interm_types)
{
stmt_vec_info stmt_info = vinfo_for_stmt (stmt);
+ loop_vec_info loop_info = STMT_VINFO_LOOP_VINFO (stmt_info);
+ struct loop *vect_loop = LOOP_VINFO_LOOP (loop_info);
bool ordered_p;
enum machine_mode vec_mode;
- enum insn_code icode1, icode2;
+ enum insn_code icode1 = 0, icode2 = 0;
optab optab1, optab2;
- tree expr = TREE_OPERAND (stmt, 1);
- tree type = TREE_TYPE (expr);
+ tree type = gimple_expr_type (stmt);
tree wide_vectype = get_vectype_for_scalar_type (type);
enum tree_code c1, c2;
- /* The result of a vectorized widening operation usually requires two vectors
+ /* The result of a vectorized widening operation usually requires two vectors
(because the widened results do not fit int one vector). The generated
vector results would normally be expected to be generated in the same
- order as in the original scalar computation. i.e. if 8 results are
+ order as in the original scalar computation, i.e. if 8 results are
generated in each vector iteration, they are to be organized as follows:
vect1: [res1,res2,res3,res4], vect2: [res5,res6,res7,res8].
However, in the special case that the result of the widening operation is
- used in a reduction copmutation only, the order doesn't matter (because
+ used in a reduction computation only, the order doesn't matter (because
when vectorizing a reduction we change the order of the computation).
- Some targets can take advatage of this and generate more efficient code.
+ Some targets can take advantage of this and generate more efficient code.
For example, targets like Altivec, that support widen_mult using a sequence
of {mult_even,mult_odd} generate the following vectors:
- vect1: [res1,res3,res5,res7], vect2: [res2,res4,res6,res8]. */
+ vect1: [res1,res3,res5,res7], vect2: [res2,res4,res6,res8].
- if (STMT_VINFO_RELEVANT (stmt_info) == vect_used_by_reduction)
+ When vectorizing outer-loops, we execute the inner-loop sequentially
+ (each vectorized inner-loop iteration contributes to VF outer-loop
+ iterations in parallel). We therefore don't allow to change the order
+ of the computation in the inner-loop during outer-loop vectorization. */
+
+ if (STMT_VINFO_RELEVANT (stmt_info) == vect_used_by_reduction
+ && !nested_in_vect_loop_p (vect_loop, stmt))
ordered_p = false;
else
ordered_p = true;
}
break;
- case NOP_EXPR:
+ CASE_CONVERT:
if (BYTES_BIG_ENDIAN)
{
c1 = VEC_UNPACK_HI_EXPR;
}
break;
+ case FLOAT_EXPR:
+ if (BYTES_BIG_ENDIAN)
+ {
+ c1 = VEC_UNPACK_FLOAT_HI_EXPR;
+ c2 = VEC_UNPACK_FLOAT_LO_EXPR;
+ }
+ else
+ {
+ c2 = VEC_UNPACK_FLOAT_HI_EXPR;
+ c1 = VEC_UNPACK_FLOAT_LO_EXPR;
+ }
+ break;
+
+ case FIX_TRUNC_EXPR:
+ /* ??? Not yet implemented due to missing VEC_UNPACK_FIX_TRUNC_HI_EXPR/
+ VEC_UNPACK_FIX_TRUNC_LO_EXPR tree codes and optabs used for
+ computing the operation. */
+ return false;
+
default:
gcc_unreachable ();
}
- *code1 = c1;
- *code2 = c2;
- optab1 = optab_for_tree_code (c1, vectype);
- optab2 = optab_for_tree_code (c2, vectype);
+ if (code == FIX_TRUNC_EXPR)
+ {
+ /* The signedness is determined from output operand. */
+ optab1 = optab_for_tree_code (c1, type, optab_default);
+ optab2 = optab_for_tree_code (c2, type, optab_default);
+ }
+ else
+ {
+ optab1 = optab_for_tree_code (c1, vectype, optab_default);
+ optab2 = optab_for_tree_code (c2, vectype, optab_default);
+ }
if (!optab1 || !optab2)
return false;
vec_mode = TYPE_MODE (vectype);
- if ((icode1 = optab1->handlers[(int) vec_mode].insn_code) == CODE_FOR_nothing
- || insn_data[icode1].operand[0].mode != TYPE_MODE (wide_vectype)
- || (icode2 = optab2->handlers[(int) vec_mode].insn_code)
+ if ((icode1 = optab_handler (optab1, vec_mode)->insn_code) == CODE_FOR_nothing
+ || (icode2 = optab_handler (optab2, vec_mode)->insn_code)
+ == CODE_FOR_nothing)
+ return false;
+
+ /* Check if it's a multi-step conversion that can be done using intermediate
+ types. */
+ if (insn_data[icode1].operand[0].mode != TYPE_MODE (wide_vectype)
+ || insn_data[icode2].operand[0].mode != TYPE_MODE (wide_vectype))
+ {
+ int i;
+ tree prev_type = vectype, intermediate_type;
+ enum machine_mode intermediate_mode, prev_mode = vec_mode;
+ optab optab3, optab4;
+
+ if (!CONVERT_EXPR_CODE_P (code))
+ return false;
+
+ *code1 = c1;
+ *code2 = c2;
+
+ /* We assume here that there will not be more than MAX_INTERM_CVT_STEPS
+ intermediate steps in promotion sequence. We try MAX_INTERM_CVT_STEPS
+ to get to NARROW_VECTYPE, and fail if we do not. */
+ *interm_types = VEC_alloc (tree, heap, MAX_INTERM_CVT_STEPS);
+ for (i = 0; i < 3; i++)
+ {
+ intermediate_mode = insn_data[icode1].operand[0].mode;
+ intermediate_type = lang_hooks.types.type_for_mode (intermediate_mode,
+ TYPE_UNSIGNED (prev_type));
+ optab3 = optab_for_tree_code (c1, intermediate_type, optab_default);
+ optab4 = optab_for_tree_code (c2, intermediate_type, optab_default);
+
+ if (!optab3 || !optab4
+ || (icode1 = optab1->handlers[(int) prev_mode].insn_code)
== CODE_FOR_nothing
- || insn_data[icode2].operand[0].mode != TYPE_MODE (wide_vectype))
+ || insn_data[icode1].operand[0].mode != intermediate_mode
+ || (icode2 = optab2->handlers[(int) prev_mode].insn_code)
+ == CODE_FOR_nothing
+ || insn_data[icode2].operand[0].mode != intermediate_mode
+ || (icode1 = optab3->handlers[(int) intermediate_mode].insn_code)
+ == CODE_FOR_nothing
+ || (icode2 = optab4->handlers[(int) intermediate_mode].insn_code)
+ == CODE_FOR_nothing)
+ return false;
+
+ VEC_quick_push (tree, *interm_types, intermediate_type);
+ (*multi_step_cvt)++;
+
+ if (insn_data[icode1].operand[0].mode == TYPE_MODE (wide_vectype)
+ && insn_data[icode2].operand[0].mode == TYPE_MODE (wide_vectype))
+ return true;
+
+ prev_type = intermediate_type;
+ prev_mode = intermediate_mode;
+ }
+
+ return false;
+ }
+
+ *code1 = c1;
+ *code2 = c2;
+ return true;
+}
+
+
+/* Function supportable_narrowing_operation
+
+ Check whether an operation represented by the code CODE is a
+ narrowing operation that is supported by the target platform in
+ vector form (i.e., when operating on arguments of type VECTYPE).
+
+ Narrowing operations we currently support are NOP (CONVERT) and
+ FIX_TRUNC. This function checks if these operations are supported by
+ the target platform directly via vector tree-codes.
+
+ Output:
+ - CODE1 is the code of a vector operation to be used when
+ vectorizing the operation, if available.
+ - MULTI_STEP_CVT determines the number of required intermediate steps in
+ case of multi-step conversion (like int->short->char - in that case
+ MULTI_STEP_CVT will be 1).
+ - INTERM_TYPES contains the intermediate type required to perform the
+ narrowing operation (short in the above example). */
+
+bool
+supportable_narrowing_operation (enum tree_code code,
+ const_gimple stmt, tree vectype,
+ enum tree_code *code1, int *multi_step_cvt,
+ VEC (tree, heap) **interm_types)
+{
+ enum machine_mode vec_mode;
+ enum insn_code icode1;
+ optab optab1, interm_optab;
+ tree type = gimple_expr_type (stmt);
+ tree narrow_vectype = get_vectype_for_scalar_type (type);
+ enum tree_code c1;
+ tree intermediate_type, prev_type;
+ int i;
+
+ switch (code)
+ {
+ CASE_CONVERT:
+ c1 = VEC_PACK_TRUNC_EXPR;
+ break;
+
+ case FIX_TRUNC_EXPR:
+ c1 = VEC_PACK_FIX_TRUNC_EXPR;
+ break;
+
+ case FLOAT_EXPR:
+ /* ??? Not yet implemented due to missing VEC_PACK_FLOAT_EXPR
+ tree code and optabs used for computing the operation. */
+ return false;
+
+ default:
+ gcc_unreachable ();
+ }
+
+ if (code == FIX_TRUNC_EXPR)
+ /* The signedness is determined from output operand. */
+ optab1 = optab_for_tree_code (c1, type, optab_default);
+ else
+ optab1 = optab_for_tree_code (c1, vectype, optab_default);
+
+ if (!optab1)
+ return false;
+
+ vec_mode = TYPE_MODE (vectype);
+ if ((icode1 = optab_handler (optab1, vec_mode)->insn_code)
+ == CODE_FOR_nothing)
return false;
+ /* Check if it's a multi-step conversion that can be done using intermediate
+ types. */
+ if (insn_data[icode1].operand[0].mode != TYPE_MODE (narrow_vectype))
+ {
+ enum machine_mode intermediate_mode, prev_mode = vec_mode;
+
+ *code1 = c1;
+ prev_type = vectype;
+ /* We assume here that there will not be more than MAX_INTERM_CVT_STEPS
+ intermediate steps in promotion sequence. We try MAX_INTERM_CVT_STEPS
+ to get to NARROW_VECTYPE, and fail if we do not. */
+ *interm_types = VEC_alloc (tree, heap, MAX_INTERM_CVT_STEPS);
+ for (i = 0; i < 3; i++)
+ {
+ intermediate_mode = insn_data[icode1].operand[0].mode;
+ intermediate_type = lang_hooks.types.type_for_mode (intermediate_mode,
+ TYPE_UNSIGNED (prev_type));
+ interm_optab = optab_for_tree_code (c1, intermediate_type,
+ optab_default);
+ if (!interm_optab
+ || (icode1 = optab1->handlers[(int) prev_mode].insn_code)
+ == CODE_FOR_nothing
+ || insn_data[icode1].operand[0].mode != intermediate_mode
+ || (icode1
+ = interm_optab->handlers[(int) intermediate_mode].insn_code)
+ == CODE_FOR_nothing)
+ return false;
+
+ VEC_quick_push (tree, *interm_types, intermediate_type);
+ (*multi_step_cvt)++;
+
+ if (insn_data[icode1].operand[0].mode == TYPE_MODE (narrow_vectype))
+ return true;
+
+ prev_type = intermediate_type;
+ prev_mode = intermediate_mode;
+ }
+
+ return false;
+ }
+
+ *code1 = c1;
return true;
}
}
}
+/* Error reporting helper for vect_is_simple_reduction below. GIMPLE statement
+ STMT is printed with a message MSG. */
+
+static void
+report_vect_op (gimple stmt, const char *msg)
+{
+ fprintf (vect_dump, "%s", msg);
+ print_gimple_stmt (vect_dump, stmt, 0, TDF_SLIM);
+}
/* Function vect_is_simple_reduction
- Detect a cross-iteration def-use cucle that represents a simple
+ Detect a cross-iteration def-use cycle that represents a simple
reduction computation. We look for the following pattern:
loop_header:
Condition 1 is tested here.
Conditions 2,3 are tested in vect_mark_stmts_to_be_vectorized. */
-tree
-vect_is_simple_reduction (struct loop *loop, tree phi)
+gimple
+vect_is_simple_reduction (loop_vec_info loop_info, gimple phi)
{
+ struct loop *loop = (gimple_bb (phi))->loop_father;
+ struct loop *vect_loop = LOOP_VINFO_LOOP (loop_info);
edge latch_e = loop_latch_edge (loop);
tree loop_arg = PHI_ARG_DEF_FROM_EDGE (phi, latch_e);
- tree def_stmt, def1, def2;
+ gimple def_stmt, def1, def2;
enum tree_code code;
- int op_type;
- tree operation, op1, op2;
+ tree op1, op2;
tree type;
+ int nloop_uses;
+ tree name;
+ imm_use_iterator imm_iter;
+ use_operand_p use_p;
- if (TREE_CODE (loop_arg) != SSA_NAME)
+ gcc_assert (loop == vect_loop || flow_loop_nested_p (vect_loop, loop));
+
+ name = PHI_RESULT (phi);
+ nloop_uses = 0;
+ FOR_EACH_IMM_USE_FAST (use_p, imm_iter, name)
{
- if (vect_print_dump_info (REPORT_DETAILS))
+ gimple use_stmt = USE_STMT (use_p);
+ if (flow_bb_inside_loop_p (loop, gimple_bb (use_stmt))
+ && vinfo_for_stmt (use_stmt)
+ && !is_pattern_stmt_p (vinfo_for_stmt (use_stmt)))
+ nloop_uses++;
+ if (nloop_uses > 1)
{
- fprintf (vect_dump, "reduction: not ssa_name: ");
- print_generic_expr (vect_dump, loop_arg, TDF_SLIM);
+ if (vect_print_dump_info (REPORT_DETAILS))
+ fprintf (vect_dump, "reduction used in loop.");
+ return NULL;
}
- return NULL_TREE;
+ }
+
+ if (TREE_CODE (loop_arg) != SSA_NAME)
+ {
+ if (vect_print_dump_info (REPORT_DETAILS))
+ {
+ fprintf (vect_dump, "reduction: not ssa_name: ");
+ print_generic_expr (vect_dump, loop_arg, TDF_SLIM);
+ }
+ return NULL;
}
def_stmt = SSA_NAME_DEF_STMT (loop_arg);
if (!def_stmt)
{
if (vect_print_dump_info (REPORT_DETAILS))
- fprintf (vect_dump, "reduction: no def_stmt.");
- return NULL_TREE;
+ fprintf (vect_dump, "reduction: no def_stmt.");
+ return NULL;
}
- if (TREE_CODE (def_stmt) != MODIFY_EXPR)
+ if (!is_gimple_assign (def_stmt))
{
if (vect_print_dump_info (REPORT_DETAILS))
- {
- print_generic_expr (vect_dump, def_stmt, TDF_SLIM);
- }
- return NULL_TREE;
+ print_gimple_stmt (vect_dump, def_stmt, 0, TDF_SLIM);
+ return NULL;
}
- operation = TREE_OPERAND (def_stmt, 1);
- code = TREE_CODE (operation);
+ name = gimple_assign_lhs (def_stmt);
+ nloop_uses = 0;
+ FOR_EACH_IMM_USE_FAST (use_p, imm_iter, name)
+ {
+ gimple use_stmt = USE_STMT (use_p);
+ if (flow_bb_inside_loop_p (loop, gimple_bb (use_stmt))
+ && vinfo_for_stmt (use_stmt)
+ && !is_pattern_stmt_p (vinfo_for_stmt (use_stmt)))
+ nloop_uses++;
+ if (nloop_uses > 1)
+ {
+ if (vect_print_dump_info (REPORT_DETAILS))
+ fprintf (vect_dump, "reduction used in loop.");
+ return NULL;
+ }
+ }
+
+ code = gimple_assign_rhs_code (def_stmt);
+
if (!commutative_tree_code (code) || !associative_tree_code (code))
{
if (vect_print_dump_info (REPORT_DETAILS))
- {
- fprintf (vect_dump, "reduction: not commutative/associative: ");
- print_generic_expr (vect_dump, operation, TDF_SLIM);
- }
- return NULL_TREE;
+ report_vect_op (def_stmt, "reduction: not commutative/associative: ");
+ return NULL;
}
- op_type = TREE_CODE_LENGTH (code);
- if (op_type != binary_op)
+ if (get_gimple_rhs_class (code) != GIMPLE_BINARY_RHS)
{
if (vect_print_dump_info (REPORT_DETAILS))
- {
- fprintf (vect_dump, "reduction: not binary operation: ");
- print_generic_expr (vect_dump, operation, TDF_SLIM);
- }
- return NULL_TREE;
+ report_vect_op (def_stmt, "reduction: not binary operation: ");
+ return NULL;
}
- op1 = TREE_OPERAND (operation, 0);
- op2 = TREE_OPERAND (operation, 1);
+ op1 = gimple_assign_rhs1 (def_stmt);
+ op2 = gimple_assign_rhs2 (def_stmt);
if (TREE_CODE (op1) != SSA_NAME || TREE_CODE (op2) != SSA_NAME)
{
if (vect_print_dump_info (REPORT_DETAILS))
- {
- fprintf (vect_dump, "reduction: uses not ssa_names: ");
- print_generic_expr (vect_dump, operation, TDF_SLIM);
- }
- return NULL_TREE;
+ report_vect_op (def_stmt, "reduction: uses not ssa_names: ");
+ return NULL;
}
/* Check that it's ok to change the order of the computation. */
- type = TREE_TYPE (operation);
+ type = TREE_TYPE (gimple_assign_lhs (def_stmt));
if (TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (TREE_TYPE (op1))
|| TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (TREE_TYPE (op2)))
{
fprintf (vect_dump, ",");
print_generic_expr (vect_dump, TREE_TYPE (op2), TDF_SLIM);
}
- return NULL_TREE;
+ return NULL;
}
+ /* Generally, when vectorizing a reduction we change the order of the
+ computation. This may change the behavior of the program in some
+ cases, so we need to check that this is ok. One exception is when
+ vectorizing an outer-loop: the inner-loop is executed sequentially,
+ and therefore vectorizing reductions in the inner-loop during
+ outer-loop vectorization is safe. */
+
/* CHECKME: check for !flag_finite_math_only too? */
- if (SCALAR_FLOAT_TYPE_P (type) && !flag_unsafe_math_optimizations)
+ if (SCALAR_FLOAT_TYPE_P (type) && !flag_associative_math
+ && !nested_in_vect_loop_p (vect_loop, def_stmt))
{
/* Changing the order of operations changes the semantics. */
if (vect_print_dump_info (REPORT_DETAILS))
- {
- fprintf (vect_dump, "reduction: unsafe fp math optimization: ");
- print_generic_expr (vect_dump, operation, TDF_SLIM);
- }
- return NULL_TREE;
+ report_vect_op (def_stmt, "reduction: unsafe fp math optimization: ");
+ return NULL;
}
- else if (INTEGRAL_TYPE_P (type) && !TYPE_UNSIGNED (type) && flag_trapv)
+ else if (INTEGRAL_TYPE_P (type) && TYPE_OVERFLOW_TRAPS (type)
+ && !nested_in_vect_loop_p (vect_loop, def_stmt))
{
/* Changing the order of operations changes the semantics. */
if (vect_print_dump_info (REPORT_DETAILS))
- {
- fprintf (vect_dump, "reduction: unsafe int math optimization: ");
- print_generic_expr (vect_dump, operation, TDF_SLIM);
- }
- return NULL_TREE;
+ report_vect_op (def_stmt, "reduction: unsafe int math optimization: ");
+ return NULL;
+ }
+ else if (SAT_FIXED_POINT_TYPE_P (type))
+ {
+ /* Changing the order of operations changes the semantics. */
+ if (vect_print_dump_info (REPORT_DETAILS))
+ report_vect_op (def_stmt,
+ "reduction: unsafe fixed-point math optimization: ");
+ return NULL;
}
/* reduction is safe. we're dealing with one of the following:
*/
def1 = SSA_NAME_DEF_STMT (op1);
def2 = SSA_NAME_DEF_STMT (op2);
- if (!def1 || !def2)
+ if (!def1 || !def2 || gimple_nop_p (def1) || gimple_nop_p (def2))
{
if (vect_print_dump_info (REPORT_DETAILS))
- {
- fprintf (vect_dump, "reduction: no defs for operands: ");
- print_generic_expr (vect_dump, operation, TDF_SLIM);
- }
- return NULL_TREE;
+ report_vect_op (def_stmt, "reduction: no defs for operands: ");
+ return NULL;
}
- if (TREE_CODE (def1) == MODIFY_EXPR
- && flow_bb_inside_loop_p (loop, bb_for_stmt (def1))
- && def2 == phi)
+
+ /* Check that one def is the reduction def, defined by PHI,
+ the other def is either defined in the loop ("vect_loop_def"),
+ or it's an induction (defined by a loop-header phi-node). */
+
+ if (def2 == phi
+ && flow_bb_inside_loop_p (loop, gimple_bb (def1))
+ && (is_gimple_assign (def1)
+ || STMT_VINFO_DEF_TYPE (vinfo_for_stmt (def1)) == vect_induction_def
+ || (gimple_code (def1) == GIMPLE_PHI
+ && STMT_VINFO_DEF_TYPE (vinfo_for_stmt (def1)) == vect_loop_def
+ && !is_loop_header_bb_p (gimple_bb (def1)))))
{
if (vect_print_dump_info (REPORT_DETAILS))
- {
- fprintf (vect_dump, "detected reduction:");
- print_generic_expr (vect_dump, operation, TDF_SLIM);
- }
+ report_vect_op (def_stmt, "detected reduction:");
return def_stmt;
}
- else if (TREE_CODE (def2) == MODIFY_EXPR
- && flow_bb_inside_loop_p (loop, bb_for_stmt (def2))
- && def1 == phi)
+ else if (def1 == phi
+ && flow_bb_inside_loop_p (loop, gimple_bb (def2))
+ && (is_gimple_assign (def2)
+ || STMT_VINFO_DEF_TYPE (vinfo_for_stmt (def2)) == vect_induction_def
+ || (gimple_code (def2) == GIMPLE_PHI
+ && STMT_VINFO_DEF_TYPE (vinfo_for_stmt (def2)) == vect_loop_def
+ && !is_loop_header_bb_p (gimple_bb (def2)))))
{
/* Swap operands (just for simplicity - so that the rest of the code
can assume that the reduction variable is always the last (second)
argument). */
if (vect_print_dump_info (REPORT_DETAILS))
- {
- fprintf (vect_dump, "detected reduction: need to swap operands:");
- print_generic_expr (vect_dump, operation, TDF_SLIM);
- }
- swap_tree_operands (def_stmt, &TREE_OPERAND (operation, 0),
- &TREE_OPERAND (operation, 1));
+ report_vect_op (def_stmt ,
+ "detected reduction: need to swap operands:");
+ swap_tree_operands (def_stmt, gimple_assign_rhs1_ptr (def_stmt),
+ gimple_assign_rhs2_ptr (def_stmt));
return def_stmt;
}
else
{
if (vect_print_dump_info (REPORT_DETAILS))
- {
- fprintf (vect_dump, "reduction: unknown pattern.");
- print_generic_expr (vect_dump, operation, TDF_SLIM);
- }
- return NULL_TREE;
+ report_vect_op (def_stmt, "reduction: unknown pattern.");
+ return NULL;
}
}
{
tree init_expr;
tree step_expr;
-
tree evolution_part = evolution_part_in_loop_num (access_fn, loop_nb);
/* When there is no evolution in this loop, the evolution function
return false;
step_expr = evolution_part;
- init_expr = unshare_expr (initial_condition_in_loop_num (access_fn,
- loop_nb));
+ init_expr = unshare_expr (initial_condition_in_loop_num (access_fn, loop_nb));
if (vect_print_dump_info (REPORT_DETAILS))
{
*step = step_expr;
if (TREE_CODE (step_expr) != INTEGER_CST)
- {
+ {
if (vect_print_dump_info (REPORT_DETAILS))
fprintf (vect_dump, "step unknown.");
return false;
Entry Point to loop vectorization phase. */
unsigned
-vectorize_loops (struct loops *loops)
+vectorize_loops (void)
{
unsigned int i;
unsigned int num_vectorized_loops = 0;
+ unsigned int vect_loops_num;
+ loop_iterator li;
+ struct loop *loop;
+
+ vect_loops_num = number_of_loops ();
+
+ /* Bail out if there are no loops. */
+ if (vect_loops_num <= 1)
+ return 0;
/* Fix the verbosity level if not defined explicitly by the user. */
vect_set_dump_settings ();
/* Allocate the bitmap that records which virtual variables that
need to be renamed. */
- vect_vnames_to_rename = BITMAP_ALLOC (NULL);
+ vect_memsyms_to_rename = BITMAP_ALLOC (NULL);
+
+ init_stmt_vec_info_vec ();
/* ----------- Analyze loops. ----------- */
/* If some loop was duplicated, it gets bigger number
than all previously defined loops. This fact allows us to run
only over initial loops skipping newly generated ones. */
- vect_loops_num = loops->num;
- for (i = 1; i < vect_loops_num; i++)
- {
- loop_vec_info loop_vinfo;
- struct loop *loop = loops->parray[i];
+ FOR_EACH_LOOP (li, loop, 0)
+ if (optimize_loop_nest_for_speed_p (loop))
+ {
+ loop_vec_info loop_vinfo;
- if (!loop)
- continue;
+ vect_loop_location = find_loop_location (loop);
+ loop_vinfo = vect_analyze_loop (loop);
+ loop->aux = loop_vinfo;
- vect_loop_location = find_loop_location (loop);
- loop_vinfo = vect_analyze_loop (loop);
- loop->aux = loop_vinfo;
-
- if (!loop_vinfo || !LOOP_VINFO_VECTORIZABLE_P (loop_vinfo))
- continue;
+ if (!loop_vinfo || !LOOP_VINFO_VECTORIZABLE_P (loop_vinfo))
+ continue;
- vect_transform_loop (loop_vinfo, loops);
- num_vectorized_loops++;
- }
+ vect_transform_loop (loop_vinfo);
+ num_vectorized_loops++;
+ }
vect_loop_location = UNKNOWN_LOC;
- if (vect_print_dump_info (REPORT_VECTORIZED_LOOPS))
+ statistics_counter_event (cfun, "Vectorized loops", num_vectorized_loops);
+ if (vect_print_dump_info (REPORT_UNVECTORIZED_LOOPS)
+ || (vect_print_dump_info (REPORT_VECTORIZED_LOOPS)
+ && num_vectorized_loops > 0))
fprintf (vect_dump, "vectorized %u loops in function.\n",
num_vectorized_loops);
/* ----------- Finalize. ----------- */
- BITMAP_FREE (vect_vnames_to_rename);
+ BITMAP_FREE (vect_memsyms_to_rename);
for (i = 1; i < vect_loops_num; i++)
{
- struct loop *loop = loops->parray[i];
loop_vec_info loop_vinfo;
+ loop = get_loop (i);
if (!loop)
continue;
- loop_vinfo = loop->aux;
- destroy_loop_vec_info (loop_vinfo);
+ loop_vinfo = (loop_vec_info) loop->aux;
+ destroy_loop_vec_info (loop_vinfo, true);
loop->aux = NULL;
}
+ free_stmt_vec_info_vec ();
+
return num_vectorized_loops > 0 ? TODO_cleanup_cfg : 0;
}
+
+/* Increase alignment of global arrays to improve vectorization potential.
+ TODO:
+ - Consider also structs that have an array field.
+ - Use ipa analysis to prune arrays that can't be vectorized?
+ This should involve global alignment analysis and in the future also
+ array padding. */
+
+static unsigned int
+increase_alignment (void)
+{
+ struct varpool_node *vnode;
+
+ /* Increase the alignment of all global arrays for vectorization. */
+ for (vnode = varpool_nodes_queue;
+ vnode;
+ vnode = vnode->next_needed)
+ {
+ tree vectype, decl = vnode->decl;
+ unsigned int alignment;
+
+ if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
+ continue;
+ vectype = get_vectype_for_scalar_type (TREE_TYPE (TREE_TYPE (decl)));
+ if (!vectype)
+ continue;
+ alignment = TYPE_ALIGN (vectype);
+ if (DECL_ALIGN (decl) >= alignment)
+ continue;
+
+ if (vect_can_force_dr_alignment_p (decl, alignment))
+ {
+ DECL_ALIGN (decl) = TYPE_ALIGN (vectype);
+ DECL_USER_ALIGN (decl) = 1;
+ if (dump_file)
+ {
+ fprintf (dump_file, "Increasing alignment of decl: ");
+ print_generic_expr (dump_file, decl, TDF_SLIM);
+ }
+ }
+ }
+ return 0;
+}
+
+static bool
+gate_increase_alignment (void)
+{
+ return flag_section_anchors && flag_tree_vectorize;
+}
+
+struct simple_ipa_opt_pass pass_ipa_increase_alignment =
+{
+ {
+ SIMPLE_IPA_PASS,
+ "increase_alignment", /* name */
+ gate_increase_alignment, /* gate */
+ increase_alignment, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ 0, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ 0 /* todo_flags_finish */
+ }
+};
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