gcc/tree-vectorizer.h

   1 /* Loop Vectorization
   2    Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
   3    Contributed by Dorit Naishlos <dorit@il.ibm.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_TREE_VECTORIZER_H
  23 #define GCC_TREE_VECTORIZER_H
  24
  25 #ifdef USE_MAPPED_LOCATION
  26   typedef source_location LOC;
  27   #define UNKNOWN_LOC UNKNOWN_LOCATION
  28   #define EXPR_LOC(e) EXPR_LOCATION(e)
  29   #define LOC_FILE(l) LOCATION_FILE (l)
  30   #define LOC_LINE(l) LOCATION_LINE (l)
  31 #else
  32   typedef source_locus LOC;
  33   #define UNKNOWN_LOC NULL
  34   #define EXPR_LOC(e) EXPR_LOCUS(e)
  35   #define LOC_FILE(l) (l)->file
  36   #define LOC_LINE(l) (l)->line
  37 #endif
  38
  39 /* Used for naming of new temporaries.  */
  40 enum vect_var_kind {
  41   vect_simple_var,
  42   vect_pointer_var
  43 };
  44
  45 /* Defines type of operation: unary or binary.  */
  46 enum operation_type {
  47   unary_op = 1,
  48   binary_op
  49 };
  50
  51 /* Define type of available alignment support.  */
  52 enum dr_alignment_support {
  53   dr_unaligned_unsupported,
  54   dr_unaligned_supported,
  55   dr_unaligned_software_pipeline,
  56   dr_aligned
  57 };
  58
  59 /* Define verbosity levels.  */
  60 enum verbosity_levels {
  61   REPORT_NONE,
  62   REPORT_VECTORIZED_LOOPS,
  63   REPORT_UNVECTORIZED_LOOPS,
  64   REPORT_ALIGNMENT,
  65   REPORT_BAD_FORM_LOOPS,
  66   REPORT_OUTER_LOOPS,
  67   REPORT_DETAILS,
  68   /* New verbosity levels should be added before this one.  */
  69   MAX_VERBOSITY_LEVEL
  70 };
  71
  72 /*-----------------------------------------------------------------*/
  73 /* Info on vectorized loops.                                       */
  74 /*-----------------------------------------------------------------*/
  75 typedef struct _loop_vec_info {
  76
  77   /* The loop to which this info struct refers to.  */
  78   struct loop *loop;
  79
  80   /* The loop basic blocks.  */
  81   basic_block *bbs;
  82
  83   /* The loop exit_condition.  */
  84   tree exit_cond;
  85
  86   /* Number of iterations.  */
  87   tree num_iters;
  88
  89   /* Is the loop vectorizable? */
  90   bool vectorizable;
  91
  92   /* Unrolling factor  */
  93   int vectorization_factor;
  94
  95   /* Unknown DRs according to which loop was peeled.  */
  96   struct data_reference *unaligned_dr;
  97
  98   /* If true, loop is peeled.
  99    unaligned_drs show in this case DRs used for peeling.  */
 100   bool do_peeling_for_alignment;
 101
 102   /* All data references in the loop that are being written to.  */
 103   varray_type data_ref_writes;
 104
 105   /* All data references in the loop that are being read from.  */
 106   varray_type data_ref_reads;
 107
 108   /* The loop location in the source.  */
 109   LOC loop_line_number;
 110 } *loop_vec_info;
 111
 112 /* Access Functions.  */
 113 #define LOOP_VINFO_LOOP(L)           (L)->loop
 114 #define LOOP_VINFO_BBS(L)            (L)->bbs
 115 #define LOOP_VINFO_EXIT_COND(L)      (L)->exit_cond
 116 #define LOOP_VINFO_NITERS(L)         (L)->num_iters
 117 #define LOOP_VINFO_VECTORIZABLE_P(L) (L)->vectorizable
 118 #define LOOP_VINFO_VECT_FACTOR(L)    (L)->vectorization_factor
 119 #define LOOP_VINFO_DATAREF_WRITES(L) (L)->data_ref_writes
 120 #define LOOP_VINFO_DATAREF_READS(L)  (L)->data_ref_reads
 121 #define LOOP_VINFO_INT_NITERS(L) (TREE_INT_CST_LOW ((L)->num_iters))
 122 #define LOOP_DO_PEELING_FOR_ALIGNMENT(L) (L)->do_peeling_for_alignment
 123 #define LOOP_VINFO_UNALIGNED_DR(L) (L)->unaligned_dr
 124 #define LOOP_VINFO_LOC(L)          (L)->loop_line_number
 125
 126 #define LOOP_LOC(L)    LOOP_VINFO_LOC(L)
 127
 128
 129 #define LOOP_VINFO_NITERS_KNOWN_P(L)                     \
 130 (host_integerp ((L)->num_iters,0)                        \
 131 && TREE_INT_CST_LOW ((L)->num_iters) > 0)
 132
 133 /*-----------------------------------------------------------------*/
 134 /* Info on vectorized defs.                                        */
 135 /*-----------------------------------------------------------------*/
 136 enum stmt_vec_info_type {
 137   undef_vec_info_type = 0,
 138   load_vec_info_type,
 139   store_vec_info_type,
 140   op_vec_info_type,
 141   assignment_vec_info_type
 142 };
 143
 144 typedef struct _stmt_vec_info {
 145
 146   enum stmt_vec_info_type type;
 147
 148   /* The stmt to which this info struct refers to.  */
 149   tree stmt;
 150
 151   /* The loop_vec_info with respect to which STMT is vectorized.  */
 152   loop_vec_info loop_vinfo;
 153
 154   /* Not all stmts in the loop need to be vectorized. e.g, the incrementation
 155      of the loop induction variable and computation of array indexes. relevant
 156      indicates whether the stmt needs to be vectorized.  */
 157   bool relevant;
 158
 159   /* The vector type to be used.  */
 160   tree vectype;
 161
 162   /* The vectorized version of the stmt.  */
 163   tree vectorized_stmt;
 164
 165
 166   /** The following is relevant only for stmts that contain a non-scalar
 167      data-ref (array/pointer/struct access). A GIMPLE stmt is expected to have
 168      at most one such data-ref.  **/
 169
 170   /* Information about the data-ref (access function, etc).  */
 171   struct data_reference *data_ref_info;
 172
 173   /* Aliasing information.  */
 174   tree memtag;
 175
 176   /** The following fields are used to store the information about
 177       data-reference. {base_address + initial_offset} is the first location
 178       accessed by data-ref in the loop, and step is the stride of data-ref in
 179       the loop in bytes;
 180       e.g.:
 181
 182                        Example 1                      Example 2
 183       data-ref         a[j].b[i][j]                   a + 4B (a is int*)
 184
 185       base_address     &a                             a
 186       initial_offset   j_0*D_j + i_0*D_i + C          4
 187       step             D_j                            4
 188
 189       data-reference structure info:
 190       base_name        a                              NULL
 191       access_fn        <access_fns of indexes of b>   (0, +, 1)
 192
 193   **/
 194   /* The above base_address, offset and step.  */
 195   tree base_address;
 196   tree initial_offset;
 197   tree step;
 198
 199   /* Alignment information. Whether the base of the data-reference is aligned
 200      to vectype.  */
 201   bool base_aligned_p;
 202   /* Alignment information. The offset of the data-reference from its base
 203      in bytes.  */
 204   tree misalignment;
 205 } *stmt_vec_info;
 206
 207 /* Access Functions.  */
 208 #define STMT_VINFO_TYPE(S)                (S)->type
 209 #define STMT_VINFO_STMT(S)                (S)->stmt
 210 #define STMT_VINFO_LOOP_VINFO(S)          (S)->loop_vinfo
 211 #define STMT_VINFO_RELEVANT_P(S)          (S)->relevant
 212 #define STMT_VINFO_VECTYPE(S)             (S)->vectype
 213 #define STMT_VINFO_VEC_STMT(S)            (S)->vectorized_stmt
 214 #define STMT_VINFO_DATA_REF(S)            (S)->data_ref_info
 215 #define STMT_VINFO_MEMTAG(S)              (S)->memtag
 216 #define STMT_VINFO_VECT_DR_BASE_ADDRESS(S)(S)->base_address
 217 #define STMT_VINFO_VECT_INIT_OFFSET(S)    (S)->initial_offset
 218 #define STMT_VINFO_VECT_STEP(S)           (S)->step
 219 #define STMT_VINFO_VECT_BASE_ALIGNED_P(S) (S)->base_aligned_p
 220 #define STMT_VINFO_VECT_MISALIGNMENT(S)   (S)->misalignment
 221
 222 static inline void set_stmt_info (stmt_ann_t ann, stmt_vec_info stmt_info);
 223 static inline stmt_vec_info vinfo_for_stmt (tree stmt);
 224
 225 static inline void
 226 set_stmt_info (stmt_ann_t ann, stmt_vec_info stmt_info)
 227 {
 228   if (ann)
 229     ann->common.aux = (char *) stmt_info;
 230 }
 231
 232 static inline stmt_vec_info
 233 vinfo_for_stmt (tree stmt)
 234 {
 235   stmt_ann_t ann = stmt_ann (stmt);
 236   return ann ? (stmt_vec_info) ann->common.aux : NULL;
 237 }
 238
 239 /*-----------------------------------------------------------------*/
 240 /* Info on data references alignment.                              */
 241 /*-----------------------------------------------------------------*/
 242
 243 /* The misalignment of the memory access in bytes.  */
 244 #define DR_MISALIGNMENT(DR)   (DR)->aux
 245
 246 static inline bool
 247 aligned_access_p (struct data_reference *data_ref_info)
 248 {
 249   return (DR_MISALIGNMENT (data_ref_info) == 0);
 250 }
 251
 252 static inline bool
 253 unknown_alignment_for_access_p (struct data_reference *data_ref_info)
 254 {
 255   return (DR_MISALIGNMENT (data_ref_info) == -1);
 256 }
 257
 258 /* Perform signed modulo, always returning a non-negative value.  */
 259 #define VECT_SMODULO(x,y) ((x) % (y) < 0 ? ((x) % (y) + (y)) : (x) % (y))
 260
 261 /* vect_dump will be set to stderr or dump_file if exist.  */
 262 extern FILE *vect_dump;
 263 extern enum verbosity_levels vect_verbosity_level;
 264
 265 /*-----------------------------------------------------------------*/
 266 /* Function prototypes.                                            */
 267 /*-----------------------------------------------------------------*/
 268
 269 /*************************************************************************
 270   Simple Loop Peeling Utilities - in tree-vectorizer.c
 271  *************************************************************************/
 272 /* Entry point for peeling of simple loops.
 273    Peel the first/last iterations of a loop.
 274    It can be used outside of the vectorizer for loops that are simple enough
 275    (see function documentation).  In the vectorizer it is used to peel the
 276    last few iterations when the loop bound is unknown or does not evenly
 277    divide by the vectorization factor, and to peel the first few iterations
 278    to force the alignment of data references in the loop.  */
 279 extern struct loop *slpeel_tree_peel_loop_to_edge
 280   (struct loop *, struct loops *, edge, tree, tree, bool);
 281 extern void slpeel_make_loop_iterate_ntimes (struct loop *, tree);
 282 extern bool slpeel_can_duplicate_loop_p (struct loop *, edge);
 283 #ifdef ENABLE_CHECKING
 284 extern void slpeel_verify_cfg_after_peeling (struct loop *, struct loop *);
 285 #endif
 286
 287
 288 /*************************************************************************
 289   General Vectorization Utilities
 290  *************************************************************************/
 291 /** In tree-vectorizer.c **/
 292 extern tree vect_strip_conversion (tree);
 293 extern tree get_vectype_for_scalar_type (tree);
 294 extern bool vect_is_simple_use (tree , loop_vec_info, tree *);
 295 extern bool vect_is_simple_iv_evolution (unsigned, tree, tree *, tree *);
 296 extern bool vect_can_force_dr_alignment_p (tree, unsigned int);
 297 extern enum dr_alignment_support vect_supportable_dr_alignment
 298   (struct data_reference *);
 299 /* Creation and deletion of loop and stmt info structs.  */
 300 extern loop_vec_info new_loop_vec_info (struct loop *loop);
 301 extern void destroy_loop_vec_info (loop_vec_info);
 302 extern stmt_vec_info new_stmt_vec_info (tree stmt, loop_vec_info);
 303 /* Main driver.  */
 304 extern void vectorize_loops (struct loops *);
 305
 306 /** In tree-vect-analyze.c  **/
 307 /* Driver for analysis stage.  */
 308 extern loop_vec_info vect_analyze_loop (struct loop *);
 309
 310 /** In tree-vect-transform.c  **/
 311 extern bool vectorizable_load (tree, block_stmt_iterator *, tree *);
 312 extern bool vectorizable_store (tree, block_stmt_iterator *, tree *);
 313 extern bool vectorizable_operation (tree, block_stmt_iterator *, tree *);
 314 extern bool vectorizable_assignment (tree, block_stmt_iterator *, tree *);
 315 /* Driver for transformation stage.  */
 316 extern void vect_transform_loop (loop_vec_info, struct loops *);
 317
 318 /*************************************************************************
 319   Vectorization Debug Information - in tree-vectorizer.c
 320  *************************************************************************/
 321 extern bool vect_print_dump_info (enum verbosity_levels, LOC);
 322 extern void vect_set_verbosity_level (const char *);
 323 extern LOC find_loop_location (struct loop *);
 324
 325 #endif  /* GCC_TREE_VECTORIZER_H  */