unsigned int lidx;
slp_tree node, load;
+ if (SLP_INSTANCE_LOADS (slp_instn).is_empty ())
+ return false;
+
/* Compare all the permutation sequences to the first one. We know
that at least one load is permuted. */
node = SLP_INSTANCE_LOADS (slp_instn)[0];
/* Gather loads in the SLP graph NODE and populate the INST loads array. */
static void
-vect_gather_slp_loads (slp_instance inst, slp_tree node,
+vect_gather_slp_loads (vec<slp_tree> &loads, slp_tree node,
hash_set<slp_tree> &visited)
{
if (visited.add (node))
stmt_vec_info stmt_info = SLP_TREE_SCALAR_STMTS (node)[0];
if (STMT_VINFO_GROUPED_ACCESS (stmt_info)
&& DR_IS_READ (STMT_VINFO_DATA_REF (stmt_info)))
- SLP_INSTANCE_LOADS (inst).safe_push (node);
+ loads.safe_push (node);
}
else
{
unsigned i;
slp_tree child;
FOR_EACH_VEC_ELT (SLP_TREE_CHILDREN (node), i, child)
- vect_gather_slp_loads (inst, child, visited);
+ vect_gather_slp_loads (loads, child, visited);
}
}
vect_gather_slp_loads (slp_instance inst, slp_tree node)
{
hash_set<slp_tree> visited;
- vect_gather_slp_loads (inst, node, visited);
-}
-
-/* Check if the required load permutations in the SLP instance
- SLP_INSTN are supported. */
-
-static bool
-vect_supported_load_permutation_p (vec_info *vinfo, slp_instance slp_instn)
-{
- unsigned int group_size = SLP_INSTANCE_GROUP_SIZE (slp_instn);
- unsigned int i, j, k, next;
- slp_tree node;
-
- if (dump_enabled_p ())
- {
- dump_printf_loc (MSG_NOTE, vect_location, "Load permutation ");
- FOR_EACH_VEC_ELT (SLP_INSTANCE_LOADS (slp_instn), i, node)
- if (node->load_permutation.exists ())
- FOR_EACH_VEC_ELT (node->load_permutation, j, next)
- dump_printf (MSG_NOTE, "%d ", next);
- else
- for (k = 0; k < group_size; ++k)
- dump_printf (MSG_NOTE, "%d ", k);
- dump_printf (MSG_NOTE, "\n");
- }
-
- /* In case of reduction every load permutation is allowed, since the order
- of the reduction statements is not important (as opposed to the case of
- grouped stores). The only condition we need to check is that all the
- load nodes are of the same size and have the same permutation (and then
- rearrange all the nodes of the SLP instance according to this
- permutation). */
-
- /* Check that all the load nodes are of the same size. */
- /* ??? Can't we assert this? */
- FOR_EACH_VEC_ELT (SLP_INSTANCE_LOADS (slp_instn), i, node)
- if (SLP_TREE_SCALAR_STMTS (node).length () != (unsigned) group_size)
- return false;
-
- node = SLP_INSTANCE_TREE (slp_instn);
- stmt_vec_info stmt_info = SLP_TREE_SCALAR_STMTS (node)[0];
-
- /* Reduction (there are no data-refs in the root).
- In reduction chain the order of the loads is not important. */
- if (!STMT_VINFO_DATA_REF (stmt_info)
- && !REDUC_GROUP_FIRST_ELEMENT (stmt_info))
- vect_attempt_slp_rearrange_stmts (slp_instn);
-
- /* In basic block vectorization we allow any subchain of an interleaving
- chain.
- FORNOW: not supported in loop SLP because of realignment compications. */
- if (is_a <bb_vec_info> (vinfo))
- {
- /* Check whether the loads in an instance form a subchain and thus
- no permutation is necessary. */
- FOR_EACH_VEC_ELT (SLP_INSTANCE_LOADS (slp_instn), i, node)
- {
- if (!SLP_TREE_LOAD_PERMUTATION (node).exists ())
- continue;
- bool subchain_p = true;
- stmt_vec_info next_load_info = NULL;
- stmt_vec_info load_info;
- FOR_EACH_VEC_ELT (SLP_TREE_SCALAR_STMTS (node), j, load_info)
- {
- if (j != 0
- && (next_load_info != load_info
- || DR_GROUP_GAP (load_info) != 1))
- {
- subchain_p = false;
- break;
- }
- next_load_info = DR_GROUP_NEXT_ELEMENT (load_info);
- }
- if (subchain_p)
- SLP_TREE_LOAD_PERMUTATION (node).release ();
- else
- {
- stmt_vec_info group_info = SLP_TREE_SCALAR_STMTS (node)[0];
- group_info = DR_GROUP_FIRST_ELEMENT (group_info);
- unsigned HOST_WIDE_INT nunits;
- unsigned k, maxk = 0;
- FOR_EACH_VEC_ELT (SLP_TREE_LOAD_PERMUTATION (node), j, k)
- if (k > maxk)
- maxk = k;
- /* In BB vectorization we may not actually use a loaded vector
- accessing elements in excess of DR_GROUP_SIZE. */
- tree vectype = STMT_VINFO_VECTYPE (group_info);
- if (!TYPE_VECTOR_SUBPARTS (vectype).is_constant (&nunits)
- || maxk >= (DR_GROUP_SIZE (group_info) & ~(nunits - 1)))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "BB vectorization with gaps at the end of "
- "a load is not supported\n");
- return false;
- }
-
- /* Verify the permutation can be generated. */
- vec<tree> tem;
- unsigned n_perms;
- if (!vect_transform_slp_perm_load (vinfo, node, tem, NULL,
- 1, true, &n_perms))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION,
- vect_location,
- "unsupported load permutation\n");
- return false;
- }
- }
- }
- return true;
- }
-
- /* For loop vectorization verify we can generate the permutation. Be
- conservative about the vectorization factor, there are permutations
- that will use three vector inputs only starting from a specific factor
- and the vectorization factor is not yet final.
- ??? The SLP instance unrolling factor might not be the maximum one. */
- unsigned n_perms;
- poly_uint64 test_vf
- = force_common_multiple (SLP_INSTANCE_UNROLLING_FACTOR (slp_instn),
- LOOP_VINFO_VECT_FACTOR
- (as_a <loop_vec_info> (vinfo)));
- FOR_EACH_VEC_ELT (SLP_INSTANCE_LOADS (slp_instn), i, node)
- if (node->load_permutation.exists ()
- && !vect_transform_slp_perm_load (vinfo, node, vNULL, NULL, test_vf,
- true, &n_perms))
- return false;
-
- return true;
+ vect_gather_slp_loads (SLP_INSTANCE_LOADS (inst), node, visited);
}
"SLP size %u vs. limit %u.\n",
tree_size, max_tree_size);
- /* Compute the load permutation. */
+ /* Check whether any load is possibly permuted. */
slp_tree load_node;
bool loads_permuted = false;
FOR_EACH_VEC_ELT (SLP_INSTANCE_LOADS (new_instance), i, load_node)
continue;
unsigned j;
stmt_vec_info load_info;
- bool this_load_permuted = false;
- stmt_vec_info first_stmt_info = DR_GROUP_FIRST_ELEMENT
- (SLP_TREE_SCALAR_STMTS (load_node)[0]);
FOR_EACH_VEC_ELT (SLP_TREE_SCALAR_STMTS (load_node), j, load_info)
if (SLP_TREE_LOAD_PERMUTATION (load_node)[j] != j)
{
- this_load_permuted = true;
+ loads_permuted = true;
break;
}
- if (!this_load_permuted
- /* The load requires permutation when unrolling exposes
- a gap either because the group is larger than the SLP
- group-size or because there is a gap between the groups. */
- && (known_eq (unrolling_factor, 1U)
- || (group_size == DR_GROUP_SIZE (first_stmt_info)
- && DR_GROUP_GAP (first_stmt_info) == 0)))
- {
- SLP_TREE_LOAD_PERMUTATION (load_node).release ();
- continue;
- }
- loads_permuted = true;
- }
-
- if (loads_permuted)
- {
- if (!vect_supported_load_permutation_p (vinfo, new_instance))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "Build SLP failed: unsupported load "
- "permutation %G", stmt_info->stmt);
- vect_free_slp_instance (new_instance, false);
- return false;
- }
}
- /* If the loads and stores can be handled with load/store-lan
+ /* If the loads and stores can be handled with load/store-lane
instructions do not generate this SLP instance. */
if (is_a <loop_vec_info> (vinfo)
&& loads_permuted
vect_free_slp_tree ((*it).second, false);
delete bst_map;
+ /* Optimize permutations in SLP reductions. */
+ slp_instance instance;
+ FOR_EACH_VEC_ELT (vinfo->slp_instances, i, instance)
+ {
+ slp_tree node = SLP_INSTANCE_TREE (instance);
+ stmt_vec_info stmt_info = SLP_TREE_SCALAR_STMTS (node)[0];
+ /* Reduction (there are no data-refs in the root).
+ In reduction chain the order of the loads is not important. */
+ if (!STMT_VINFO_DATA_REF (stmt_info)
+ && !REDUC_GROUP_FIRST_ELEMENT (stmt_info))
+ vect_attempt_slp_rearrange_stmts (instance);
+ }
+
+ /* Gather all loads in the SLP graph. */
+ hash_set<slp_tree> visited;
+ FOR_EACH_VEC_ELT (vinfo->slp_instances, i, instance)
+ vect_gather_slp_loads (vinfo->slp_loads, SLP_INSTANCE_TREE (instance),
+ visited);
+
return opt_result::success ();
}
+void
+vect_optimize_slp (vec_info *vinfo)
+{
+ slp_tree node;
+ unsigned i;
+ FOR_EACH_VEC_ELT (vinfo->slp_loads, i, node)
+ {
+ if (!SLP_TREE_LOAD_PERMUTATION (node).exists ())
+ continue;
+
+ /* In basic block vectorization we allow any subchain of an interleaving
+ chain.
+ FORNOW: not in loop SLP because of realignment complications. */
+ if (is_a <bb_vec_info> (vinfo))
+ {
+ bool subchain_p = true;
+ stmt_vec_info next_load_info = NULL;
+ stmt_vec_info load_info;
+ unsigned j;
+ FOR_EACH_VEC_ELT (SLP_TREE_SCALAR_STMTS (node), j, load_info)
+ {
+ if (j != 0
+ && (next_load_info != load_info
+ || DR_GROUP_GAP (load_info) != 1))
+ {
+ subchain_p = false;
+ break;
+ }
+ next_load_info = DR_GROUP_NEXT_ELEMENT (load_info);
+ }
+ if (subchain_p)
+ {
+ SLP_TREE_LOAD_PERMUTATION (node).release ();
+ continue;
+ }
+ }
+ else
+ {
+ stmt_vec_info load_info;
+ bool this_load_permuted = false;
+ unsigned j;
+ FOR_EACH_VEC_ELT (SLP_TREE_SCALAR_STMTS (node), j, load_info)
+ if (SLP_TREE_LOAD_PERMUTATION (node)[j] != j)
+ {
+ this_load_permuted = true;
+ break;
+ }
+ stmt_vec_info first_stmt_info
+ = DR_GROUP_FIRST_ELEMENT (SLP_TREE_SCALAR_STMTS (node)[0]);
+ if (!this_load_permuted
+ /* The load requires permutation when unrolling exposes
+ a gap either because the group is larger than the SLP
+ group-size or because there is a gap between the groups. */
+ && (known_eq (LOOP_VINFO_VECT_FACTOR (as_a <loop_vec_info> (vinfo)), 1U)
+ || ((SLP_TREE_SCALAR_STMTS (node).length ()
+ == DR_GROUP_SIZE (first_stmt_info))
+ && DR_GROUP_GAP (first_stmt_info) == 0)))
+ {
+ SLP_TREE_LOAD_PERMUTATION (node).release ();
+ continue;
+ }
+ }
+ }
+}
+
/* For each possible SLP instance decide whether to SLP it and calculate overall
unrolling factor needed to SLP the loop. Return TRUE if decided to SLP at
return false;
}
+ /* Optimize permutations. */
+ vect_optimize_slp (bb_vinfo);
+
vect_record_base_alignments (bb_vinfo);
/* Analyze and verify the alignment of data references and the
projects / gcc.git / commitdiff