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tree-vectorizer.h (vect_build_loop_niters): New parameter. 

* tree-vectorizer.h (vect_build_loop_niters): New parameter.
	* tree-vect-loop-manip.c (vect_build_loop_niters): New parameter.
	Set true to new parameter if new ssa variable is defined.
	(vect_gen_vector_loop_niters): Refactor.  Set range information
	for the new vector loop bound variable.
	(vect_do_peeling): Ditto.

From-SVN: r248958
This commit is contained in:
Bin Cheng 2017-06-07 10:53:02 +00:00 committed by Bin Cheng
parent ba00284ced
commit 7078979b29
3 changed files with 44 additions and 22 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
2017-06-07 Bin Cheng <bin.cheng@arm.com>
* tree-vectorizer.h (vect_build_loop_niters): New parameter.
* tree-vect-loop-manip.c (vect_build_loop_niters): New parameter.
Set true to new parameter if new ssa variable is defined.
(vect_gen_vector_loop_niters): Refactor. Set range information
for the new vector loop bound variable.
(vect_do_peeling): Ditto.
2017-06-07 Bin Cheng <bin.cheng@arm.com>
* tree-affine.c (ssa.h): Include header file.

55
gcc/tree-vect-loop-manip.c
View File

@ -1095,10 +1095,11 @@ vect_update_inits_of_drs (loop_vec_info loop_vinfo, tree niters)
/* This function builds ni_name = number of iterations. Statements
are emitted on the loop preheader edge. */
are emitted on the loop preheader edge. If NEW_VAR_P is not NULL, set
it to TRUE if new ssa_var is generated. */
tree
vect_build_loop_niters (loop_vec_info loop_vinfo)
vect_build_loop_niters (loop_vec_info loop_vinfo, bool *new_var_p)
{
tree ni = unshare_expr (LOOP_VINFO_NITERS (loop_vinfo));
if (TREE_CODE (ni) == INTEGER_CST)
@ -1112,7 +1113,11 @@ vect_build_loop_niters (loop_vec_info loop_vinfo)
var = create_tmp_var (TREE_TYPE (ni), "niters");
ni_name = force_gimple_operand (ni, &stmts, false, var);
if (stmts)
gsi_insert_seq_on_edge_immediate (pe, stmts);
{
gsi_insert_seq_on_edge_immediate (pe, stmts);
if (new_var_p != NULL)
*new_var_p = true;
}
return ni_name;
}
@ -1177,22 +1182,21 @@ vect_gen_vector_loop_niters (loop_vec_info loop_vinfo, tree niters,
tree *niters_vector_ptr, bool niters_no_overflow)
{
tree ni_minus_gap, var;
tree niters_vector;
tree niters_vector, type = TREE_TYPE (niters);
int vf = LOOP_VINFO_VECT_FACTOR (loop_vinfo);
edge pe = loop_preheader_edge (LOOP_VINFO_LOOP (loop_vinfo));
tree log_vf = build_int_cst (TREE_TYPE (niters), exact_log2 (vf));
tree log_vf = build_int_cst (type, exact_log2 (vf));
/* If epilogue loop is required because of data accesses with gaps, we
subtract one iteration from the total number of iterations here for
correct calculation of RATIO. */
if (LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo))
{
ni_minus_gap = fold_build2 (MINUS_EXPR, TREE_TYPE (niters),
niters,
build_one_cst (TREE_TYPE (niters)));
ni_minus_gap = fold_build2 (MINUS_EXPR, type, niters,
build_one_cst (type));
if (!is_gimple_val (ni_minus_gap))
{
var = create_tmp_var (TREE_TYPE (niters), "ni_gap");
var = create_tmp_var (type, "ni_gap");
gimple *stmts = NULL;
ni_minus_gap = force_gimple_operand (ni_minus_gap, &stmts,
true, var);
@ -1208,25 +1212,28 @@ vect_gen_vector_loop_niters (loop_vec_info loop_vinfo, tree niters,
(niters - vf) >> log2(vf) + 1 by using the fact that we know ratio
will be at least one. */
if (niters_no_overflow)
niters_vector = fold_build2 (RSHIFT_EXPR, TREE_TYPE (niters),
ni_minus_gap, log_vf);
niters_vector = fold_build2 (RSHIFT_EXPR, type, ni_minus_gap, log_vf);
else
niters_vector
= fold_build2 (PLUS_EXPR, TREE_TYPE (niters),
fold_build2 (RSHIFT_EXPR, TREE_TYPE (niters),
fold_build2 (MINUS_EXPR, TREE_TYPE (niters),
ni_minus_gap,
build_int_cst
(TREE_TYPE (niters), vf)),
= fold_build2 (PLUS_EXPR, type,
fold_build2 (RSHIFT_EXPR, type,
fold_build2 (MINUS_EXPR, type, ni_minus_gap,
build_int_cst (type, vf)),
log_vf),
build_int_cst (TREE_TYPE (niters), 1));
build_int_cst (type, 1));
if (!is_gimple_val (niters_vector))
{
var = create_tmp_var (TREE_TYPE (niters), "bnd");
gimple *stmts = NULL;
var = create_tmp_var (type, "bnd");
gimple_seq stmts = NULL;
niters_vector = force_gimple_operand (niters_vector, &stmts, true, var);
gsi_insert_seq_on_edge_immediate (pe, stmts);
/* Peeling algorithm guarantees that vector loop bound is at least ONE,
we set range information to make niters analyzer's life easier. */
if (stmts != NULL)
set_range_info (niters_vector, VR_RANGE, build_int_cst (type, 1),
fold_build2 (RSHIFT_EXPR, type,
TYPE_MAX_VALUE (type), log_vf));
}
*niters_vector_ptr = niters_vector;
@ -1771,7 +1778,13 @@ vect_do_peeling (loop_vec_info loop_vinfo, tree niters, tree nitersm1,
LOOP_VINFO_NITERSM1 (loop_vinfo)
= fold_build2 (MINUS_EXPR, type,
LOOP_VINFO_NITERSM1 (loop_vinfo), niters_prolog);
niters = vect_build_loop_niters (loop_vinfo);
bool new_var_p = false;
niters = vect_build_loop_niters (loop_vinfo, &new_var_p);
/* It's guaranteed that vector loop bound before vectorization is at
least VF, so set range information for newly generated var. */
if (new_var_p)
set_range_info (niters, VR_RANGE,
build_int_cst (type, vf), TYPE_MAX_VALUE (type));
/* Prolog iterates at most bound_prolog times, latch iterates at
most bound_prolog - 1 times. */

2
gcc/tree-vectorizer.h
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@ -1150,7 +1150,7 @@ extern gimple *vect_force_simple_reduction (loop_vec_info, gimple *,
bool *, bool);
/* Drive for loop analysis stage. */
extern loop_vec_info vect_analyze_loop (struct loop *, loop_vec_info);
extern tree vect_build_loop_niters (loop_vec_info);
extern tree vect_build_loop_niters (loop_vec_info, bool * = NULL);
extern void vect_gen_vector_loop_niters (loop_vec_info, tree, tree *, bool);
/* Drive for loop transformation stage. */
extern struct loop *vect_transform_loop (loop_vec_info);