2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Dorit Naishlos <dorit@il.ibm.com>
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* Loop and basic block vectorizer.
24 This file contains drivers for the three vectorizers:
25 (1) loop vectorizer (inter-iteration parallelism),
26 (2) loop-aware SLP (intra-iteration parallelism) (invoked by the loop
28 (3) BB vectorizer (out-of-loops), aka SLP
30 The rest of the vectorizer's code is organized as follows:
31 - tree-vect-loop.c - loop specific parts such as reductions, etc. These are
32 used by drivers (1) and (2).
33 - tree-vect-loop-manip.c - vectorizer's loop control-flow utilities, used by
35 - tree-vect-slp.c - BB vectorization specific analysis and transformation,
36 used by drivers (2) and (3).
37 - tree-vect-stmts.c - statements analysis and transformation (used by all).
38 - tree-vect-data-refs.c - vectorizer specific data-refs analysis and
39 manipulations (used by all).
40 - tree-vect-patterns.c - vectorizable code patterns detector (used by all)
42 Here's a poor attempt at illustrating that:
45 loop_vect() loop_aware_slp() slp_vect()
48 tree-vect-loop.c tree-vect-slp.c
53 tree-vect-stmts.c tree-vect-data-refs.c
60 #include "coretypes.h"
64 #include "tree-pretty-print.h"
65 #include "tree-flow.h"
66 #include "tree-dump.h"
68 #include "tree-vectorizer.h"
69 #include "tree-pass.h"
72 /* vect_dump will be set to stderr or dump_file if exist. */
75 /* vect_verbosity_level set to an invalid value
76 to mark that it's uninitialized. */
77 static enum vect_verbosity_levels vect_verbosity_level
= MAX_VERBOSITY_LEVEL
;
79 /* Loop or bb location. */
82 /* Vector mapping GIMPLE stmt to stmt_vec_info. */
83 VEC(vec_void_p
,heap
) *stmt_vec_info_vec
;
87 /* Function vect_set_dump_settings.
89 Fix the verbosity level of the vectorizer if the
90 requested level was not set explicitly using the flag
91 -ftree-vectorizer-verbose=N.
92 Decide where to print the debugging information (dump_file/stderr).
93 If the user defined the verbosity level, but there is no dump file,
94 print to stderr, otherwise print to the dump file. */
97 vect_set_dump_settings (bool slp
)
99 vect_dump
= dump_file
;
101 /* Check if the verbosity level was defined by the user: */
102 if (user_vect_verbosity_level
!= MAX_VERBOSITY_LEVEL
)
104 vect_verbosity_level
= user_vect_verbosity_level
;
105 /* Ignore user defined verbosity if dump flags require higher level of
109 if (((dump_flags
& TDF_DETAILS
)
110 && vect_verbosity_level
>= REPORT_DETAILS
)
111 || ((dump_flags
& TDF_STATS
)
112 && vect_verbosity_level
>= REPORT_UNVECTORIZED_LOCATIONS
))
117 /* If there is no dump file, print to stderr in case of loop
126 /* User didn't specify verbosity level: */
127 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
128 vect_verbosity_level
= REPORT_DETAILS
;
129 else if (dump_file
&& (dump_flags
& TDF_STATS
))
130 vect_verbosity_level
= REPORT_UNVECTORIZED_LOCATIONS
;
132 vect_verbosity_level
= REPORT_NONE
;
134 gcc_assert (dump_file
|| vect_verbosity_level
== REPORT_NONE
);
138 /* Function debug_loop_details.
140 For vectorization debug dumps. */
143 vect_print_dump_info (enum vect_verbosity_levels vl
)
145 if (vl
> vect_verbosity_level
)
148 if (!current_function_decl
|| !vect_dump
)
151 if (vect_location
== UNKNOWN_LOC
)
152 fprintf (vect_dump
, "\n%s:%d: note: ",
153 DECL_SOURCE_FILE (current_function_decl
),
154 DECL_SOURCE_LINE (current_function_decl
));
156 fprintf (vect_dump
, "\n%d: ", LOC_LINE (vect_location
));
162 /* Function vectorize_loops.
164 Entry point to loop vectorization phase. */
167 vectorize_loops (void)
170 unsigned int num_vectorized_loops
= 0;
171 unsigned int vect_loops_num
;
175 vect_loops_num
= number_of_loops ();
177 /* Bail out if there are no loops. */
178 if (vect_loops_num
<= 1)
181 /* Fix the verbosity level if not defined explicitly by the user. */
182 vect_set_dump_settings (false);
184 init_stmt_vec_info_vec ();
186 /* ----------- Analyze loops. ----------- */
188 /* If some loop was duplicated, it gets bigger number
189 than all previously defined loops. This fact allows us to run
190 only over initial loops skipping newly generated ones. */
191 FOR_EACH_LOOP (li
, loop
, 0)
192 if (optimize_loop_nest_for_speed_p (loop
))
194 loop_vec_info loop_vinfo
;
196 vect_location
= find_loop_location (loop
);
197 if (vect_location
!= UNKNOWN_LOC
198 && vect_verbosity_level
> REPORT_NONE
)
199 fprintf (vect_dump
, "\nAnalyzing loop at %s:%d\n",
200 LOC_FILE (vect_location
), LOC_LINE (vect_location
));
202 loop_vinfo
= vect_analyze_loop (loop
);
203 loop
->aux
= loop_vinfo
;
205 if (!loop_vinfo
|| !LOOP_VINFO_VECTORIZABLE_P (loop_vinfo
))
208 if (vect_location
!= UNKNOWN_LOC
209 && vect_verbosity_level
> REPORT_NONE
)
210 fprintf (vect_dump
, "\n\nVectorizing loop at %s:%d\n",
211 LOC_FILE (vect_location
), LOC_LINE (vect_location
));
213 vect_transform_loop (loop_vinfo
);
214 num_vectorized_loops
++;
217 vect_location
= UNKNOWN_LOC
;
219 statistics_counter_event (cfun
, "Vectorized loops", num_vectorized_loops
);
220 if (vect_print_dump_info (REPORT_UNVECTORIZED_LOCATIONS
)
221 || (num_vectorized_loops
> 0
222 && vect_print_dump_info (REPORT_VECTORIZED_LOCATIONS
)))
223 fprintf (vect_dump
, "vectorized %u loops in function.\n",
224 num_vectorized_loops
);
226 /* ----------- Finalize. ----------- */
228 mark_sym_for_renaming (gimple_vop (cfun
));
230 for (i
= 1; i
< vect_loops_num
; i
++)
232 loop_vec_info loop_vinfo
;
237 loop_vinfo
= (loop_vec_info
) loop
->aux
;
238 destroy_loop_vec_info (loop_vinfo
, true);
242 free_stmt_vec_info_vec ();
244 return num_vectorized_loops
> 0 ? TODO_cleanup_cfg
: 0;
248 /* Entry point to basic block SLP phase. */
251 execute_vect_slp (void)
255 /* Fix the verbosity level if not defined explicitly by the user. */
256 vect_set_dump_settings (true);
258 init_stmt_vec_info_vec ();
262 vect_location
= find_bb_location (bb
);
264 if (vect_slp_analyze_bb (bb
))
266 vect_slp_transform_bb (bb
);
268 if (vect_print_dump_info (REPORT_VECTORIZED_LOCATIONS
))
269 fprintf (vect_dump
, "basic block vectorized using SLP\n");
273 free_stmt_vec_info_vec ();
280 /* Apply SLP either if the vectorizer is on and the user didn't specify
281 whether to run SLP or not, or if the SLP flag was set by the user. */
282 return ((flag_tree_vectorize
!= 0 && flag_tree_slp_vectorize
!= 0)
283 || flag_tree_slp_vectorize
== 1);
286 struct gimple_opt_pass pass_slp_vectorize
=
291 gate_vect_slp
, /* gate */
292 execute_vect_slp
, /* execute */
295 0, /* static_pass_number */
296 TV_TREE_SLP_VECTORIZATION
, /* tv_id */
297 PROP_ssa
| PROP_cfg
, /* properties_required */
298 0, /* properties_provided */
299 0, /* properties_destroyed */
300 0, /* todo_flags_start */
304 | TODO_verify_stmts
/* todo_flags_finish */
309 /* Increase alignment of global arrays to improve vectorization potential.
311 - Consider also structs that have an array field.
312 - Use ipa analysis to prune arrays that can't be vectorized?
313 This should involve global alignment analysis and in the future also
317 increase_alignment (void)
319 struct varpool_node
*vnode
;
321 /* Increase the alignment of all global arrays for vectorization. */
322 FOR_EACH_DEFINED_VARIABLE (vnode
)
324 tree vectype
, decl
= vnode
->symbol
.decl
;
326 unsigned int alignment
;
329 if (TREE_CODE (t
) != ARRAY_TYPE
)
331 vectype
= get_vectype_for_scalar_type (strip_array_types (t
));
334 alignment
= TYPE_ALIGN (vectype
);
335 if (DECL_ALIGN (decl
) >= alignment
)
338 if (vect_can_force_dr_alignment_p (decl
, alignment
))
340 DECL_ALIGN (decl
) = TYPE_ALIGN (vectype
);
341 DECL_USER_ALIGN (decl
) = 1;
344 fprintf (dump_file
, "Increasing alignment of decl: ");
345 print_generic_expr (dump_file
, decl
, TDF_SLIM
);
346 fprintf (dump_file
, "\n");
355 gate_increase_alignment (void)
357 return flag_section_anchors
&& flag_tree_vectorize
;
361 struct simple_ipa_opt_pass pass_ipa_increase_alignment
=
365 "increase_alignment", /* name */
366 gate_increase_alignment
, /* gate */
367 increase_alignment
, /* execute */
370 0, /* static_pass_number */
371 TV_IPA_OPT
, /* tv_id */
372 0, /* properties_required */
373 0, /* properties_provided */
374 0, /* properties_destroyed */
375 0, /* todo_flags_start */
376 0 /* todo_flags_finish */