/* Loop Vectorization
- Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005, 2006, 2007 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/>. */
#ifndef GCC_TREE_VECTORIZER_H
#define GCC_TREE_VECTORIZER_H
enum dr_alignment_support {
dr_unaligned_unsupported,
dr_unaligned_supported,
- dr_unaligned_software_pipeline,
+ dr_explicit_realign,
+ dr_explicit_realign_optimized,
dr_aligned
};
/* Define type of def-use cross-iteration cycle. */
enum vect_def_type {
- vect_constant_def,
+ vect_constant_def = 1,
vect_invariant_def,
vect_loop_def,
vect_induction_def,
REPORT_DR_DETAILS,
REPORT_BAD_FORM_LOOPS,
REPORT_OUTER_LOOPS,
+ REPORT_SLP,
REPORT_DETAILS,
/* New verbosity levels should be added before this one. */
MAX_VERBOSITY_LEVEL
};
+/************************************************************************
+ SLP
+ ************************************************************************/
+
+/* A computation tree of an SLP instance. Each node corresponds to a group of
+ stmts to be packed in a SIMD stmt. */
+typedef struct _slp_tree {
+ /* Only binary and unary operations are supported. LEFT child corresponds to
+ the first operand and RIGHT child to the second if the operation is
+ binary. */
+ struct _slp_tree *left;
+ struct _slp_tree *right;
+ /* A group of scalar stmts to be vectorized together. */
+ VEC (tree, heap) *stmts;
+ /* Vectorized stmt/s. */
+ VEC (tree, heap) *vec_stmts;
+ /* Number of vector stmts that are created to replace the group of scalar
+ stmts. It is calculated during the transformation phase as the number of
+ scalar elements in one scalar iteration (GROUP_SIZE) multiplied by VF
+ divided by vector size. */
+ unsigned int vec_stmts_size;
+ /* Vectorization costs associated with SLP node. */
+ struct
+ {
+ int outside_of_loop; /* Statements generated outside loop. */
+ int inside_of_loop; /* Statements generated inside loop. */
+ } cost;
+} *slp_tree;
+
+
+/* SLP instance is a sequence of stmts in a loop that can be packed into
+ SIMD stmts. */
+typedef struct _slp_instance {
+ /* The root of SLP tree. */
+ slp_tree root;
+
+ /* Size of groups of scalar stmts that will be replaced by SIMD stmt/s. */
+ unsigned int group_size;
+
+ /* The unrolling factor required to vectorized this SLP instance. */
+ unsigned int unrolling_factor;
+
+ /* Vectorization costs associated with SLP instance. */
+ struct
+ {
+ int outside_of_loop; /* Statements generated outside loop. */
+ int inside_of_loop; /* Statements generated inside loop. */
+ } cost;
+} *slp_instance;
+
+DEF_VEC_P(slp_instance);
+DEF_VEC_ALLOC_P(slp_instance, heap);
+
+/* Access Functions. */
+#define SLP_INSTANCE_TREE(S) (S)->root
+#define SLP_INSTANCE_GROUP_SIZE(S) (S)->group_size
+#define SLP_INSTANCE_UNROLLING_FACTOR(S) (S)->unrolling_factor
+#define SLP_INSTANCE_OUTSIDE_OF_LOOP_COST(S) (S)->cost.outside_of_loop
+#define SLP_INSTANCE_INSIDE_OF_LOOP_COST(S) (S)->cost.inside_of_loop
+
+#define SLP_TREE_LEFT(S) (S)->left
+#define SLP_TREE_RIGHT(S) (S)->right
+#define SLP_TREE_SCALAR_STMTS(S) (S)->stmts
+#define SLP_TREE_VEC_STMTS(S) (S)->vec_stmts
+#define SLP_TREE_NUMBER_OF_VEC_STMTS(S) (S)->vec_stmts_size
+#define SLP_TREE_OUTSIDE_OF_LOOP_COST(S) (S)->cost.outside_of_loop
+#define SLP_TREE_INSIDE_OF_LOOP_COST(S) (S)->cost.inside_of_loop
+
/*-----------------------------------------------------------------*/
/* Info on vectorized loops. */
/*-----------------------------------------------------------------*/
/* The loop basic blocks. */
basic_block *bbs;
- /* The loop exit_condition. */
- tree exit_cond;
-
/* Number of iterations. */
tree num_iters;
+ /* Minimum number of iterations below which vectorization is expected to
+ not be profitable (as estimated by the cost model).
+ -1 indicates that vectorization will not be profitable.
+ FORNOW: This field is an int. Will be a tree in the future, to represent
+ values unknown at compile time. */
+ int min_profitable_iters;
+
/* Is the loop vectorizable? */
bool vectorizable;
/* All data dependences in the loop. */
VEC (ddr_p, heap) *ddrs;
+ /* Data Dependence Relations defining address ranges that are candidates
+ for a run-time aliasing check. */
+ VEC (ddr_p, heap) *may_alias_ddrs;
+
/* Statements in the loop that have data references that are candidates for a
runtime (loop versioning) misalignment check. */
VEC(tree,heap) *may_misalign_stmts;
/* The loop location in the source. */
LOC loop_line_number;
+
+ /* All interleaving chains of stores in the loop, represented by the first
+ stmt in the chain. */
+ VEC(tree, heap) *strided_stores;
+
+ /* All SLP instances in the loop. This is a subset of the set of STRIDED_STORES
+ of the loop. */
+ VEC(slp_instance, heap) *slp_instances;
+
+ /* The unrolling factor needed to SLP the loop. In case of that pure SLP is
+ applied to the loop, i.e., no unrolling is needed, this is 1. */
+ unsigned slp_unrolling_factor;
} *loop_vec_info;
/* Access Functions. */
#define LOOP_VINFO_LOOP(L) (L)->loop
#define LOOP_VINFO_BBS(L) (L)->bbs
-#define LOOP_VINFO_EXIT_COND(L) (L)->exit_cond
#define LOOP_VINFO_NITERS(L) (L)->num_iters
+#define LOOP_VINFO_COST_MODEL_MIN_ITERS(L) (L)->min_profitable_iters
#define LOOP_VINFO_VECTORIZABLE_P(L) (L)->vectorizable
#define LOOP_VINFO_VECT_FACTOR(L) (L)->vectorization_factor
#define LOOP_VINFO_PTR_MASK(L) (L)->ptr_mask
#define LOOP_VINFO_UNALIGNED_DR(L) (L)->unaligned_dr
#define LOOP_VINFO_MAY_MISALIGN_STMTS(L) (L)->may_misalign_stmts
#define LOOP_VINFO_LOC(L) (L)->loop_line_number
+#define LOOP_VINFO_MAY_ALIAS_DDRS(L) (L)->may_alias_ddrs
+#define LOOP_VINFO_STRIDED_STORES(L) (L)->strided_stores
+#define LOOP_VINFO_SLP_INSTANCES(L) (L)->slp_instances
+#define LOOP_VINFO_SLP_UNROLLING_FACTOR(L) (L)->slp_unrolling_factor
#define NITERS_KNOWN_P(n) \
(host_integerp ((n),0) \
#define LOOP_VINFO_NITERS_KNOWN_P(L) \
NITERS_KNOWN_P((L)->num_iters)
+static inline loop_vec_info
+loop_vec_info_for_loop (struct loop *loop)
+{
+ return (loop_vec_info) loop->aux;
+}
+
+static inline bool
+nested_in_vect_loop_p (struct loop *loop, tree stmt)
+{
+ return (loop->inner
+ && (loop->inner == (bb_for_stmt (stmt))->loop_father));
+}
+
/*-----------------------------------------------------------------*/
/* Info on vectorized defs. */
/*-----------------------------------------------------------------*/
induc_vec_info_type,
type_promotion_vec_info_type,
type_demotion_vec_info_type,
- type_conversion_vec_info_type
+ type_conversion_vec_info_type,
+ loop_exit_ctrl_vec_info_type
};
/* Indicates whether/how a variable is used in the loop. */
enum vect_relevant {
vect_unused_in_loop = 0,
+ vect_used_in_outer_by_reduction,
+ vect_used_in_outer,
/* defs that feed computations that end up (only) in a reduction. These
defs may be used by non-reduction stmts, but eventually, any
vect_used_in_loop
};
+/* The type of vectorization that can be applied to the stmt: regular loop-based
+ vectorization; pure SLP - the stmt is a part of SLP instances and does not
+ have uses outside SLP instances; or hybrid SLP and loop-based - the stmt is
+ a part of SLP instance and also must be loop-based vectorized, since it has
+ uses outside SLP sequences.
+
+ In the loop context the meanings of pure and hybrid SLP are slightly
+ different. By saying that pure SLP is applied to the loop, we mean that we
+ exploit only intra-iteration parallelism in the loop; i.e., the loop can be
+ vectorized without doing any conceptual unrolling, cause we don't pack
+ together stmts from different iterations, only within a single iteration.
+ Loop hybrid SLP means that we exploit both intra-iteration and
+ inter-iteration parallelism (e.g., number of elements in the vector is 4
+ and the slp-group-size is 2, in which case we don't have enough parallelism
+ within an iteration, so we obtain the rest of the parallelism from subsequent
+ iterations by unrolling the loop by 2). */
+enum slp_vect_type {
+ loop_vect = 0,
+ pure_slp,
+ hybrid
+};
+
+
typedef struct data_reference *dr_p;
DEF_VEC_P(dr_p);
DEF_VEC_ALLOC_P(dr_p,heap);
data-ref (array/pointer/struct access). A GIMPLE stmt is expected to have
at most one such data-ref. **/
- /* Information about the data-ref (access function, etc). */
+ /* Information about the data-ref (access function, etc),
+ relative to the inner-most containing loop. */
struct data_reference *data_ref_info;
+ /* Information about the data-ref relative to this loop
+ nest (the loop that is being considered for vectorization). */
+ tree dr_base_address;
+ tree dr_init;
+ tree dr_offset;
+ tree dr_step;
+ tree dr_aligned_to;
+
/* Stmt is part of some pattern (computation idiom) */
bool in_pattern_p;
/* For loads only, if there is a store with the same location, this field is
TRUE. */
bool read_write_dep;
+
+ /* Vectorization costs associated with statement. */
+ struct
+ {
+ int outside_of_loop; /* Statements generated outside loop. */
+ int inside_of_loop; /* Statements generated inside loop. */
+ } cost;
+
+ /* Whether the stmt is SLPed, loop-based vectorized, or both. */
+ enum slp_vect_type slp_type;
} *stmt_vec_info;
/* Access Functions. */
#define STMT_VINFO_VECTYPE(S) (S)->vectype
#define STMT_VINFO_VEC_STMT(S) (S)->vectorized_stmt
#define STMT_VINFO_DATA_REF(S) (S)->data_ref_info
+
+#define STMT_VINFO_DR_BASE_ADDRESS(S) (S)->dr_base_address
+#define STMT_VINFO_DR_INIT(S) (S)->dr_init
+#define STMT_VINFO_DR_OFFSET(S) (S)->dr_offset
+#define STMT_VINFO_DR_STEP(S) (S)->dr_step
+#define STMT_VINFO_DR_ALIGNED_TO(S) (S)->dr_aligned_to
+
#define STMT_VINFO_IN_PATTERN_P(S) (S)->in_pattern_p
#define STMT_VINFO_RELATED_STMT(S) (S)->related_stmt
#define STMT_VINFO_SAME_ALIGN_REFS(S) (S)->same_align_refs
#define STMT_VINFO_DR_GROUP_GAP(S) (S)->gap
#define STMT_VINFO_DR_GROUP_SAME_DR_STMT(S)(S)->same_dr_stmt
#define STMT_VINFO_DR_GROUP_READ_WRITE_DEPENDENCE(S) (S)->read_write_dep
+#define STMT_VINFO_STRIDED_ACCESS(S) ((S)->first_dr != NULL)
#define DR_GROUP_FIRST_DR(S) (S)->first_dr
#define DR_GROUP_NEXT_DR(S) (S)->next_dr
#define DR_GROUP_READ_WRITE_DEPENDENCE(S) (S)->read_write_dep
#define STMT_VINFO_RELEVANT_P(S) ((S)->relevant != vect_unused_in_loop)
+#define STMT_VINFO_OUTSIDE_OF_LOOP_COST(S) (S)->cost.outside_of_loop
+#define STMT_VINFO_INSIDE_OF_LOOP_COST(S) (S)->cost.inside_of_loop
+
+#define HYBRID_SLP_STMT(S) ((S)->slp_type == hybrid)
+#define PURE_SLP_STMT(S) ((S)->slp_type == pure_slp)
+#define STMT_SLP_TYPE(S) (S)->slp_type
+
+/* These are some defines for the initial implementation of the vectorizer's
+ cost model. These will later be target specific hooks. */
+
+/* Cost of conditional taken branch. */
+#ifndef TARG_COND_TAKEN_BRANCH_COST
+#define TARG_COND_TAKEN_BRANCH_COST 3
+#endif
+
+/* Cost of conditional not taken branch. */
+#ifndef TARG_COND_NOT_TAKEN_BRANCH_COST
+#define TARG_COND_NOT_TAKEN_BRANCH_COST 1
+#endif
+
+/* Cost of any scalar operation, excluding load and store. */
+#ifndef TARG_SCALAR_STMT_COST
+#define TARG_SCALAR_STMT_COST 1
+#endif
+
+/* Cost of scalar load. */
+#ifndef TARG_SCALAR_LOAD_COST
+#define TARG_SCALAR_LOAD_COST 1
+#endif
+
+/* Cost of scalar store. */
+#ifndef TARG_SCALAR_STORE_COST
+#define TARG_SCALAR_STORE_COST 1
+#endif
+
+/* Cost of any vector operation, excluding load, store or vector to scalar
+ operation. */
+#ifndef TARG_VEC_STMT_COST
+#define TARG_VEC_STMT_COST 1
+#endif
+
+/* Cost of vector to scalar operation. */
+#ifndef TARG_VEC_TO_SCALAR_COST
+#define TARG_VEC_TO_SCALAR_COST 1
+#endif
+
+/* Cost of scalar to vector operation. */
+#ifndef TARG_SCALAR_TO_VEC_COST
+#define TARG_SCALAR_TO_VEC_COST 1
+#endif
+
+/* Cost of aligned vector load. */
+#ifndef TARG_VEC_LOAD_COST
+#define TARG_VEC_LOAD_COST 1
+#endif
+
+/* Cost of misaligned vector load. */
+#ifndef TARG_VEC_UNALIGNED_LOAD_COST
+#define TARG_VEC_UNALIGNED_LOAD_COST 2
+#endif
+
+/* Cost of vector store. */
+#ifndef TARG_VEC_STORE_COST
+#define TARG_VEC_STORE_COST 1
+#endif
static inline void set_stmt_info (stmt_ann_t ann, stmt_vec_info stmt_info);
static inline stmt_vec_info vinfo_for_stmt (tree stmt);
return false;
}
+static inline bool
+is_loop_header_bb_p (basic_block bb)
+{
+ if (bb == (bb->loop_father)->header)
+ return true;
+ gcc_assert (EDGE_COUNT (bb->preds) == 1);
+ return false;
+}
+
+static inline void
+stmt_vinfo_set_inside_of_loop_cost (stmt_vec_info stmt_info, slp_tree slp_node,
+ int cost)
+{
+ if (slp_node)
+ SLP_TREE_INSIDE_OF_LOOP_COST (slp_node) = cost;
+ else
+ STMT_VINFO_INSIDE_OF_LOOP_COST (stmt_info) = cost;
+}
+
+static inline void
+stmt_vinfo_set_outside_of_loop_cost (stmt_vec_info stmt_info, slp_tree slp_node,
+ int cost)
+{
+ if (slp_node)
+ SLP_TREE_OUTSIDE_OF_LOOP_COST (slp_node) = cost;
+ else
+ STMT_VINFO_OUTSIDE_OF_LOOP_COST (stmt_info) = cost;
+}
+
+
/*-----------------------------------------------------------------*/
/* Info on data references alignment. */
/*-----------------------------------------------------------------*/
extern struct loop *slpeel_tree_peel_loop_to_edge
(struct loop *, edge, tree, tree, bool, unsigned int);
extern void slpeel_make_loop_iterate_ntimes (struct loop *, tree);
-extern bool slpeel_can_duplicate_loop_p (struct loop *, edge);
+extern bool slpeel_can_duplicate_loop_p (const struct loop *, const_edge);
#ifdef ENABLE_CHECKING
extern void slpeel_verify_cfg_after_peeling (struct loop *, struct loop *);
#endif
extern bool vect_is_simple_use (tree, loop_vec_info, tree *, tree *,
enum vect_def_type *);
extern bool vect_is_simple_iv_evolution (unsigned, tree, tree *, tree *);
-extern tree vect_is_simple_reduction (struct loop *, tree);
-extern bool vect_can_force_dr_alignment_p (tree, unsigned int);
+extern tree vect_is_simple_reduction (loop_vec_info, tree);
+extern bool vect_can_force_dr_alignment_p (const_tree, unsigned int);
extern enum dr_alignment_support vect_supportable_dr_alignment
(struct data_reference *);
extern bool reduction_code_for_scalar_code (enum tree_code, enum tree_code *);
extern bool supportable_widening_operation (enum tree_code, tree, tree,
tree *, tree *, enum tree_code *, enum tree_code *);
-extern bool supportable_narrowing_operation (enum tree_code, tree, tree,
- enum tree_code *);
+extern bool supportable_narrowing_operation (enum tree_code, const_tree,
+ const_tree, enum tree_code *);
/* Creation and deletion of loop and stmt info structs. */
extern loop_vec_info new_loop_vec_info (struct loop *loop);
-extern void destroy_loop_vec_info (loop_vec_info);
+extern void destroy_loop_vec_info (loop_vec_info, bool);
extern stmt_vec_info new_stmt_vec_info (tree stmt, loop_vec_info);
/** In tree-vect-analyze.c **/
/* Driver for analysis stage. */
extern loop_vec_info vect_analyze_loop (struct loop *);
-
+extern void vect_free_slp_tree (slp_tree);
+extern loop_vec_info vect_analyze_loop_form (struct loop *);
/** In tree-vect-patterns.c **/
/* Pattern recognition functions.
/** In tree-vect-transform.c **/
-extern bool vectorizable_load (tree, block_stmt_iterator *, tree *);
-extern bool vectorizable_store (tree, block_stmt_iterator *, tree *);
-extern bool vectorizable_operation (tree, block_stmt_iterator *, tree *);
+extern bool vectorizable_load (tree, block_stmt_iterator *, tree *, slp_tree);
+extern bool vectorizable_store (tree, block_stmt_iterator *, tree *, slp_tree);
+extern bool vectorizable_operation (tree, block_stmt_iterator *, tree *,
+ slp_tree);
extern bool vectorizable_type_promotion (tree, block_stmt_iterator *, tree *);
extern bool vectorizable_type_demotion (tree, block_stmt_iterator *, tree *);
extern bool vectorizable_conversion (tree, block_stmt_iterator *,
- tree *);
-extern bool vectorizable_assignment (tree, block_stmt_iterator *, tree *);
+ tree *, slp_tree);
+extern bool vectorizable_assignment (tree, block_stmt_iterator *, tree *,
+ slp_tree);
extern tree vectorizable_function (tree, tree, tree);
extern bool vectorizable_call (tree, block_stmt_iterator *, tree *);
extern bool vectorizable_condition (tree, block_stmt_iterator *, tree *);
extern bool vectorizable_live_operation (tree, block_stmt_iterator *, tree *);
extern bool vectorizable_reduction (tree, block_stmt_iterator *, tree *);
extern bool vectorizable_induction (tree, block_stmt_iterator *, tree *);
+extern int vect_estimate_min_profitable_iters (loop_vec_info);
+extern void vect_model_simple_cost (stmt_vec_info, int, enum vect_def_type *,
+ slp_tree);
+extern void vect_model_store_cost (stmt_vec_info, int, enum vect_def_type,
+ slp_tree);
+extern void vect_model_load_cost (stmt_vec_info, int, slp_tree);
/* Driver for transformation stage. */
extern void vect_transform_loop (loop_vec_info);
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