| /* Vectorizer |
| Copyright (C) 2003-2013 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 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* Loop and basic block vectorizer. |
| |
| This file contains drivers for the three vectorizers: |
| (1) loop vectorizer (inter-iteration parallelism), |
| (2) loop-aware SLP (intra-iteration parallelism) (invoked by the loop |
| vectorizer) |
| (3) BB vectorizer (out-of-loops), aka SLP |
| |
| The rest of the vectorizer's code is organized as follows: |
| - tree-vect-loop.c - loop specific parts such as reductions, etc. These are |
| used by drivers (1) and (2). |
| - tree-vect-loop-manip.c - vectorizer's loop control-flow utilities, used by |
| drivers (1) and (2). |
| - tree-vect-slp.c - BB vectorization specific analysis and transformation, |
| used by drivers (2) and (3). |
| - tree-vect-stmts.c - statements analysis and transformation (used by all). |
| - tree-vect-data-refs.c - vectorizer specific data-refs analysis and |
| manipulations (used by all). |
| - tree-vect-patterns.c - vectorizable code patterns detector (used by all) |
| |
| Here's a poor attempt at illustrating that: |
| |
| tree-vectorizer.c: |
| loop_vect() loop_aware_slp() slp_vect() |
| | / \ / |
| | / \ / |
| tree-vect-loop.c tree-vect-slp.c |
| | \ \ / / | |
| | \ \/ / | |
| | \ /\ / | |
| | \ / \ / | |
| tree-vect-stmts.c tree-vect-data-refs.c |
| \ / |
| tree-vect-patterns.c |
| */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "dumpfile.h" |
| #include "tm.h" |
| #include "ggc.h" |
| #include "tree.h" |
| #include "tree-pretty-print.h" |
| #include "tree-flow.h" |
| #include "cfgloop.h" |
| #include "tree-vectorizer.h" |
| #include "tree-pass.h" |
| |
| /* Loop or bb location. */ |
| LOC vect_location; |
| |
| /* Vector mapping GIMPLE stmt to stmt_vec_info. */ |
| vec<vec_void_p> stmt_vec_info_vec; |
| |
| |
| /* Function vectorize_loops. |
| |
| Entry point to loop vectorization phase. */ |
| |
| unsigned |
| vectorize_loops (void) |
| { |
| unsigned int i; |
| unsigned int num_vectorized_loops = 0; |
| unsigned int vect_loops_num; |
| loop_iterator li; |
| struct loop *loop; |
| |
| vect_loops_num = number_of_loops (); |
| |
| /* Bail out if there are no loops. */ |
| if (vect_loops_num <= 1) |
| return 0; |
| |
| init_stmt_vec_info_vec (); |
| |
| /* ----------- Analyze loops. ----------- */ |
| |
| /* If some loop was duplicated, it gets bigger number |
| than all previously defined loops. This fact allows us to run |
| only over initial loops skipping newly generated ones. */ |
| FOR_EACH_LOOP (li, loop, 0) |
| if (optimize_loop_nest_for_speed_p (loop)) |
| { |
| loop_vec_info loop_vinfo; |
| vect_location = find_loop_location (loop); |
| if (LOCATION_LOCUS (vect_location) != UNKNOWN_LOC |
| && dump_enabled_p ()) |
| dump_printf (MSG_ALL, "\nAnalyzing loop at %s:%d\n", |
| LOC_FILE (vect_location), LOC_LINE (vect_location)); |
| |
| loop_vinfo = vect_analyze_loop (loop); |
| loop->aux = loop_vinfo; |
| |
| if (!loop_vinfo || !LOOP_VINFO_VECTORIZABLE_P (loop_vinfo)) |
| continue; |
| |
| if (LOCATION_LOCUS (vect_location) != UNKNOWN_LOC |
| && dump_enabled_p ()) |
| dump_printf (MSG_ALL, "\n\nVectorizing loop at %s:%d\n", |
| LOC_FILE (vect_location), LOC_LINE (vect_location)); |
| vect_transform_loop (loop_vinfo); |
| num_vectorized_loops++; |
| } |
| |
| vect_location = UNKNOWN_LOC; |
| |
| statistics_counter_event (cfun, "Vectorized loops", num_vectorized_loops); |
| if (dump_enabled_p () |
| || (num_vectorized_loops > 0 && dump_enabled_p ())) |
| dump_printf_loc (MSG_ALL, vect_location, |
| "vectorized %u loops in function.\n", |
| num_vectorized_loops); |
| |
| /* ----------- Finalize. ----------- */ |
| |
| for (i = 1; i < vect_loops_num; i++) |
| { |
| loop_vec_info loop_vinfo; |
| |
| loop = get_loop (i); |
| if (!loop) |
| continue; |
| loop_vinfo = (loop_vec_info) loop->aux; |
| destroy_loop_vec_info (loop_vinfo, true); |
| loop->aux = NULL; |
| } |
| |
| free_stmt_vec_info_vec (); |
| |
| return num_vectorized_loops > 0 ? TODO_cleanup_cfg : 0; |
| } |
| |
| |
| /* Entry point to basic block SLP phase. */ |
| |
| static unsigned int |
| execute_vect_slp (void) |
| { |
| basic_block bb; |
| |
| init_stmt_vec_info_vec (); |
| |
| FOR_EACH_BB (bb) |
| { |
| vect_location = find_bb_location (bb); |
| |
| if (vect_slp_analyze_bb (bb)) |
| { |
| vect_slp_transform_bb (bb); |
| if (dump_enabled_p ()) |
| dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location, |
| "basic block vectorized using SLP\n"); |
| } |
| } |
| |
| free_stmt_vec_info_vec (); |
| return 0; |
| } |
| |
| static bool |
| gate_vect_slp (void) |
| { |
| /* Apply SLP either if the vectorizer is on and the user didn't specify |
| whether to run SLP or not, or if the SLP flag was set by the user. */ |
| return ((flag_tree_vectorize != 0 && flag_tree_slp_vectorize != 0) |
| || flag_tree_slp_vectorize == 1); |
| } |
| |
| struct gimple_opt_pass pass_slp_vectorize = |
| { |
| { |
| GIMPLE_PASS, |
| "slp", /* name */ |
| OPTGROUP_LOOP |
| | OPTGROUP_VEC, /* optinfo_flags */ |
| gate_vect_slp, /* gate */ |
| execute_vect_slp, /* execute */ |
| NULL, /* sub */ |
| NULL, /* next */ |
| 0, /* static_pass_number */ |
| TV_TREE_SLP_VECTORIZATION, /* tv_id */ |
| PROP_ssa | PROP_cfg, /* properties_required */ |
| 0, /* properties_provided */ |
| 0, /* properties_destroyed */ |
| 0, /* todo_flags_start */ |
| TODO_ggc_collect |
| | TODO_verify_ssa |
| | TODO_update_ssa |
| | TODO_verify_stmts /* todo_flags_finish */ |
| } |
| }; |
| |
| |
| /* Increase alignment of global arrays to improve vectorization potential. |
| TODO: |
| - Consider also structs that have an array field. |
| - Use ipa analysis to prune arrays that can't be vectorized? |
| This should involve global alignment analysis and in the future also |
| array padding. */ |
| |
| static unsigned int |
| increase_alignment (void) |
| { |
| struct varpool_node *vnode; |
| |
| vect_location = UNKNOWN_LOC; |
| |
| /* Increase the alignment of all global arrays for vectorization. */ |
| FOR_EACH_DEFINED_VARIABLE (vnode) |
| { |
| tree vectype, decl = vnode->symbol.decl; |
| tree t; |
| unsigned int alignment; |
| |
| t = TREE_TYPE(decl); |
| if (TREE_CODE (t) != ARRAY_TYPE) |
| continue; |
| vectype = get_vectype_for_scalar_type (strip_array_types (t)); |
| if (!vectype) |
| continue; |
| alignment = TYPE_ALIGN (vectype); |
| if (DECL_ALIGN (decl) >= alignment) |
| continue; |
| |
| if (vect_can_force_dr_alignment_p (decl, alignment)) |
| { |
| DECL_ALIGN (decl) = TYPE_ALIGN (vectype); |
| DECL_USER_ALIGN (decl) = 1; |
| dump_printf (MSG_NOTE, "Increasing alignment of decl: "); |
| dump_generic_expr (MSG_NOTE, TDF_SLIM, decl); |
| dump_printf (MSG_NOTE, "\n"); |
| } |
| } |
| return 0; |
| } |
| |
| |
| static bool |
| gate_increase_alignment (void) |
| { |
| return flag_section_anchors && flag_tree_vectorize; |
| } |
| |
| |
| struct simple_ipa_opt_pass pass_ipa_increase_alignment = |
| { |
| { |
| SIMPLE_IPA_PASS, |
| "increase_alignment", /* name */ |
| OPTGROUP_LOOP |
| | OPTGROUP_VEC, /* optinfo_flags */ |
| gate_increase_alignment, /* gate */ |
| increase_alignment, /* execute */ |
| NULL, /* sub */ |
| NULL, /* next */ |
| 0, /* static_pass_number */ |
| TV_IPA_OPT, /* tv_id */ |
| 0, /* properties_required */ |
| 0, /* properties_provided */ |
| 0, /* properties_destroyed */ |
| 0, /* todo_flags_start */ |
| 0 /* todo_flags_finish */ |
| } |
| }; |
