/* Given the condition statement COND, put it as the last statement
of GUARD_BB; EXIT_BB is the basic block to skip the loop;
Assumes that this is the single exit of the guarded loop.
- Returns the skip edge. */
+ Returns the skip edge, inserts new stmts on the COND_EXPR_STMT_LIST. */
static edge
-slpeel_add_loop_guard (basic_block guard_bb, tree cond, basic_block exit_bb,
- basic_block dom_bb)
+slpeel_add_loop_guard (basic_block guard_bb, tree cond,
+ gimple_seq cond_expr_stmt_list,
+ basic_block exit_bb, basic_block dom_bb)
{
gimple_stmt_iterator gsi;
edge new_e, enter_e;
gsi = gsi_last_bb (guard_bb);
cond = force_gimple_operand (cond, &gimplify_stmt_list, true, NULL_TREE);
+ if (gimplify_stmt_list)
+ gimple_seq_add_seq (&cond_expr_stmt_list, gimplify_stmt_list);
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);
+ if (cond_expr_stmt_list)
+ gsi_insert_seq_after (&gsi, cond_expr_stmt_list, GSI_NEW_STMT);
gsi = gsi_last_bb (guard_bb);
gsi_insert_after (&gsi, cond_stmt, GSI_NEW_STMT);
The second guard is:
if (FIRST_NITERS == NITERS) then skip the second loop.
+ If the optional COND_EXPR and COND_EXPR_STMT_LIST arguments are given
+ then the generated condition is combined with COND_EXPR and the
+ statements in COND_EXPR_STMT_LIST are emitted together with it.
+
FORNOW only simple loops are supported (see slpeel_can_duplicate_loop_p).
FORNOW the resulting code will not be in loop-closed-ssa form.
*/
slpeel_tree_peel_loop_to_edge (struct loop *loop,
edge e, tree first_niters,
tree niters, bool update_first_loop_count,
- unsigned int th, bool check_profitability)
+ unsigned int th, bool check_profitability,
+ tree cond_expr, gimple_seq cond_expr_stmt_list)
{
struct loop *new_loop = NULL, *first_loop, *second_loop;
edge skip_e;
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.
+ time. This check is combined with any pre-existing
+ check in COND_EXPR to avoid versioning.
Resulting CFG after prologue peeling would be:
pre_condition = fold_build2 (TRUTH_OR_EXPR, boolean_type_node,
cost_pre_condition, pre_condition);
}
+ if (cond_expr)
+ {
+ pre_condition =
+ fold_build2 (TRUTH_OR_EXPR, boolean_type_node,
+ pre_condition,
+ fold_build1 (TRUTH_NOT_EXPR, boolean_type_node,
+ cond_expr));
+ }
}
/* Prologue peeling. */
}
skip_e = slpeel_add_loop_guard (bb_before_first_loop, pre_condition,
+ cond_expr_stmt_list,
bb_before_second_loop, bb_before_first_loop);
slpeel_update_phi_nodes_for_guard1 (skip_e, first_loop,
first_loop == new_loop,
pre_condition =
fold_build2 (EQ_EXPR, boolean_type_node, first_niters, niters);
- skip_e = slpeel_add_loop_guard (bb_between_loops, pre_condition,
+ skip_e = slpeel_add_loop_guard (bb_between_loops, pre_condition, NULL,
bb_after_second_loop, bb_before_first_loop);
slpeel_update_phi_nodes_for_guard2 (skip_e, second_loop,
second_loop == new_loop, &new_exit_bb);
/* This function builds ni_name = number of iterations loop executes
- on the loop preheader. */
+ on the loop preheader. If SEQ is given the stmt is instead emitted
+ there. */
static tree
-vect_build_loop_niters (loop_vec_info loop_vinfo)
+vect_build_loop_niters (loop_vec_info loop_vinfo, gimple_seq seq)
{
tree ni_name, var;
gimple_seq stmts = NULL;
pe = loop_preheader_edge (loop);
if (stmts)
{
- basic_block new_bb = gsi_insert_seq_on_edge_immediate (pe, stmts);
- gcc_assert (!new_bb);
+ if (seq)
+ gimple_seq_add_seq (&seq, stmts);
+ else
+ {
+ basic_block new_bb = gsi_insert_seq_on_edge_immediate (pe, stmts);
+ gcc_assert (!new_bb);
+ }
}
return ni_name;
ratio = ni_name / vf
ratio_mult_vf_name = ratio * vf
- and places them at the loop preheader edge. */
+ and places them at the loop preheader edge or in COND_EXPR_STMT_LIST
+ if that is non-NULL. */
static void
vect_generate_tmps_on_preheader (loop_vec_info loop_vinfo,
tree *ni_name_ptr,
tree *ratio_mult_vf_name_ptr,
- tree *ratio_name_ptr)
+ tree *ratio_name_ptr,
+ gimple_seq cond_expr_stmt_list)
{
edge pe;
/* Generate temporary variable that contains
number of iterations loop executes. */
- ni_name = vect_build_loop_niters (loop_vinfo);
+ ni_name = vect_build_loop_niters (loop_vinfo, cond_expr_stmt_list);
log_vf = build_int_cst (TREE_TYPE (ni), exact_log2 (vf));
/* Create: ratio = ni >> log2(vf) */
stmts = NULL;
ratio_name = force_gimple_operand (ratio_name, &stmts, true, var);
- pe = loop_preheader_edge (loop);
- new_bb = gsi_insert_seq_on_edge_immediate (pe, stmts);
- gcc_assert (!new_bb);
+ if (cond_expr_stmt_list)
+ gimple_seq_add_seq (&cond_expr_stmt_list, stmts);
+ else
+ {
+ pe = loop_preheader_edge (loop);
+ new_bb = gsi_insert_seq_on_edge_immediate (pe, stmts);
+ gcc_assert (!new_bb);
+ }
}
/* Create: ratio_mult_vf = ratio << log2 (vf). */
stmts = NULL;
ratio_mult_vf_name = force_gimple_operand (ratio_mult_vf_name, &stmts,
true, var);
- pe = loop_preheader_edge (loop);
- new_bb = gsi_insert_seq_on_edge_immediate (pe, stmts);
- gcc_assert (!new_bb);
+ if (cond_expr_stmt_list)
+ gimple_seq_add_seq (&cond_expr_stmt_list, stmts);
+ else
+ {
+ pe = loop_preheader_edge (loop);
+ new_bb = gsi_insert_seq_on_edge_immediate (pe, stmts);
+ gcc_assert (!new_bb);
+ }
}
*ni_name_ptr = ni_name;
NITERS % VECTORIZATION_FACTOR times.
The original loop will later be made to iterate
- NITERS / VECTORIZATION_FACTOR times (this value is placed into RATIO). */
+ NITERS / VECTORIZATION_FACTOR times (this value is placed into RATIO).
+
+ COND_EXPR and COND_EXPR_STMT_LIST are combined with a new generated
+ test. */
void
-vect_do_peeling_for_loop_bound (loop_vec_info loop_vinfo, tree *ratio)
+vect_do_peeling_for_loop_bound (loop_vec_info loop_vinfo, tree *ratio,
+ tree cond_expr, gimple_seq cond_expr_stmt_list)
{
tree ni_name, ratio_mult_vf_name;
struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo);
ratio = ni_name / vf
ratio_mult_vf_name = ratio * vf */
vect_generate_tmps_on_preheader (loop_vinfo, &ni_name,
- &ratio_mult_vf_name, ratio);
+ &ratio_mult_vf_name, ratio,
+ cond_expr_stmt_list);
loop_num = loop->num;
peeling for alignment. */
if (!VEC_length (gimple, LOOP_VINFO_MAY_MISALIGN_STMTS (loop_vinfo))
&& !VEC_length (ddr_p, LOOP_VINFO_MAY_ALIAS_DDRS (loop_vinfo))
- && !LOOP_PEELING_FOR_ALIGNMENT (loop_vinfo))
+ && !LOOP_PEELING_FOR_ALIGNMENT (loop_vinfo)
+ && !cond_expr)
{
check_profitability = true;
new_loop = slpeel_tree_peel_loop_to_edge (loop, single_exit (loop),
ratio_mult_vf_name, ni_name, false,
- th, check_profitability);
+ th, check_profitability,
+ cond_expr, cond_expr_stmt_list);
gcc_assert (new_loop);
gcc_assert (loop_num == loop->num);
#ifdef ENABLE_CHECKING
tree niters_of_prolog_loop, ni_name;
tree n_iters;
struct loop *new_loop;
- bool check_profitability = false;
unsigned int th = 0;
int min_profitable_iters;
initialize_original_copy_tables ();
- ni_name = vect_build_loop_niters (loop_vinfo);
+ ni_name = vect_build_loop_niters (loop_vinfo, NULL);
niters_of_prolog_loop = vect_gen_niters_for_prolog_loop (loop_vinfo, ni_name);
- /* If cost model check not done during versioning. */
- if (!VEC_length (gimple, LOOP_VINFO_MAY_MISALIGN_STMTS (loop_vinfo))
- && !VEC_length (ddr_p, LOOP_VINFO_MAY_ALIAS_DDRS (loop_vinfo)))
- {
- check_profitability = true;
-
- /* Get profitability threshold for vectorized loop. */
- min_profitable_iters = LOOP_VINFO_COST_MODEL_MIN_ITERS (loop_vinfo);
-
- th = conservative_cost_threshold (loop_vinfo,
- min_profitable_iters);
- }
+ /* Get profitability threshold for vectorized loop. */
+ min_profitable_iters = LOOP_VINFO_COST_MODEL_MIN_ITERS (loop_vinfo);
+ th = conservative_cost_threshold (loop_vinfo,
+ min_profitable_iters);
/* Peel the prolog loop and iterate it niters_of_prolog_loop. */
new_loop =
slpeel_tree_peel_loop_to_edge (loop, loop_preheader_edge (loop),
niters_of_prolog_loop, ni_name, true,
- th, check_profitability);
+ th, true, NULL_TREE, NULL);
gcc_assert (new_loop);
#ifdef ENABLE_CHECKING
The test generated to check which version of loop is executed
is modified to also check for profitability as indicated by the
- cost model initially. */
+ cost model initially.
+
+ The versioning precondition(s) are placed in *COND_EXPR and
+ *COND_EXPR_STMT_LIST. If DO_VERSIONING is true versioning is
+ also performed, otherwise only the conditions are generated. */
void
-vect_loop_versioning (loop_vec_info loop_vinfo)
+vect_loop_versioning (loop_vec_info loop_vinfo, bool do_versioning,
+ tree *cond_expr, gimple_seq *cond_expr_stmt_list)
{
struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo);
struct loop *nloop;
- tree cond_expr = NULL_TREE;
- gimple_seq cond_expr_stmt_list = NULL;
basic_block condition_bb;
gimple_stmt_iterator gsi, cond_exp_gsi;
basic_block merge_bb;
th = conservative_cost_threshold (loop_vinfo,
min_profitable_iters);
- cond_expr =
+ *cond_expr =
fold_build2 (GT_EXPR, boolean_type_node, scalar_loop_iters,
build_int_cst (TREE_TYPE (scalar_loop_iters), th));
- cond_expr = force_gimple_operand (cond_expr, &cond_expr_stmt_list,
- false, NULL_TREE);
+ *cond_expr = force_gimple_operand (*cond_expr, cond_expr_stmt_list,
+ false, NULL_TREE);
if (VEC_length (gimple, LOOP_VINFO_MAY_MISALIGN_STMTS (loop_vinfo)))
- vect_create_cond_for_align_checks (loop_vinfo, &cond_expr,
- &cond_expr_stmt_list);
+ vect_create_cond_for_align_checks (loop_vinfo, cond_expr,
+ cond_expr_stmt_list);
if (VEC_length (ddr_p, LOOP_VINFO_MAY_ALIAS_DDRS (loop_vinfo)))
- vect_create_cond_for_alias_checks (loop_vinfo, &cond_expr,
- &cond_expr_stmt_list);
-
- cond_expr =
- fold_build2 (NE_EXPR, boolean_type_node, cond_expr, integer_zero_node);
- cond_expr =
- force_gimple_operand (cond_expr, &gimplify_stmt_list, true, NULL_TREE);
- gimple_seq_add_seq (&cond_expr_stmt_list, gimplify_stmt_list);
+ vect_create_cond_for_alias_checks (loop_vinfo, cond_expr,
+ cond_expr_stmt_list);
+
+ *cond_expr =
+ fold_build2 (NE_EXPR, boolean_type_node, *cond_expr, integer_zero_node);
+ *cond_expr =
+ force_gimple_operand (*cond_expr, &gimplify_stmt_list, true, NULL_TREE);
+ gimple_seq_add_seq (cond_expr_stmt_list, gimplify_stmt_list);
+
+ /* If we only needed the extra conditions and a new loop copy
+ bail out here. */
+ if (!do_versioning)
+ return;
initialize_original_copy_tables ();
- nloop = loop_version (loop, cond_expr, &condition_bb,
+ nloop = loop_version (loop, *cond_expr, &condition_bb,
prob, prob, REG_BR_PROB_BASE - prob, true);
free_original_copy_tables();
/* End loop-exit-fixes after versioning. */
update_ssa (TODO_update_ssa);
- if (cond_expr_stmt_list)
+ if (*cond_expr_stmt_list)
{
cond_exp_gsi = gsi_last_bb (condition_bb);
- gsi_insert_seq_before (&cond_exp_gsi, cond_expr_stmt_list, GSI_SAME_STMT);
+ gsi_insert_seq_before (&cond_exp_gsi, *cond_expr_stmt_list,
+ GSI_SAME_STMT);
+ *cond_expr_stmt_list = NULL;
}
+ *cond_expr = NULL_TREE;
}
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