From 9d36dec1109ff9dc6c3a707f976c952c2cd1ddbb Mon Sep 17 00:00:00 2001 From: Martin Liska Date: Fri, 28 Aug 2020 10:26:13 +0200 Subject: [PATCH] Add if-chain to switch conversion pass. gcc/ChangeLog: PR tree-optimization/14799 PR ipa/88702 * Makefile.in: Add gimple-if-to-switch.o. * dbgcnt.def (DEBUG_COUNTER): Add new debug counter. * passes.def: Include new pass_if_to_switch pass. * timevar.def (TV_TREE_IF_TO_SWITCH): New timevar. * tree-pass.h (make_pass_if_to_switch): New. * tree-ssa-reassoc.c (struct operand_entry): Move to the header. (dump_range_entry): Move to header file. (debug_range_entry): Likewise. (no_side_effect_bb): Make it global. * tree-switch-conversion.h (simple_cluster::simple_cluster): Add inline for couple of functions in order to prevent error about multiple defined symbols. * gimple-if-to-switch.cc: New file. * tree-ssa-reassoc.h: New file. gcc/testsuite/ChangeLog: PR tree-optimization/14799 PR ipa/88702 * gcc.dg/tree-ssa/pr96480.c: Disable if-to-switch conversion. * gcc.dg/tree-ssa/reassoc-32.c: Likewise. * g++.dg/tree-ssa/if-to-switch-1.C: New test. * gcc.dg/tree-ssa/if-to-switch-1.c: New test. * gcc.dg/tree-ssa/if-to-switch-2.c: New test. * gcc.dg/tree-ssa/if-to-switch-3.c: New test. * gcc.dg/tree-ssa/if-to-switch-4.c: New test. * gcc.dg/tree-ssa/if-to-switch-5.c: New test. * gcc.dg/tree-ssa/if-to-switch-6.c: New test. * gcc.dg/tree-ssa/if-to-switch-7.c: New test. * gcc.dg/tree-ssa/if-to-switch-8.c: New test. --- gcc/Makefile.in | 1 + gcc/dbgcnt.def | 1 + gcc/gimple-if-to-switch.cc | 566 ++++++++++++++++++ gcc/passes.def | 1 + .../g++.dg/tree-ssa/if-to-switch-1.C | 25 + .../gcc.dg/tree-ssa/if-to-switch-1.c | 35 ++ .../gcc.dg/tree-ssa/if-to-switch-2.c | 11 + .../gcc.dg/tree-ssa/if-to-switch-3.c | 11 + .../gcc.dg/tree-ssa/if-to-switch-4.c | 36 ++ .../gcc.dg/tree-ssa/if-to-switch-5.c | 12 + .../gcc.dg/tree-ssa/if-to-switch-6.c | 42 ++ .../gcc.dg/tree-ssa/if-to-switch-7.c | 25 + .../gcc.dg/tree-ssa/if-to-switch-8.c | 27 + gcc/testsuite/gcc.dg/tree-ssa/pr96480.c | 2 +- gcc/testsuite/gcc.dg/tree-ssa/reassoc-32.c | 2 +- gcc/timevar.def | 1 + gcc/tree-pass.h | 1 + gcc/tree-ssa-reassoc.c | 27 +- gcc/tree-ssa-reassoc.h | 48 ++ gcc/tree-switch-conversion.h | 24 +- 20 files changed, 866 insertions(+), 32 deletions(-) create mode 100644 gcc/gimple-if-to-switch.cc create mode 100644 gcc/testsuite/g++.dg/tree-ssa/if-to-switch-1.C create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-1.c create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-2.c create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-3.c create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-4.c create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-5.c create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-6.c create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-7.c create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-8.c create mode 100644 gcc/tree-ssa-reassoc.h diff --git a/gcc/Makefile.in b/gcc/Makefile.in index 778ec09c75d..16be66fefc6 100644 --- a/gcc/Makefile.in +++ b/gcc/Makefile.in @@ -1364,6 +1364,7 @@ OBJS = \ gimple-array-bounds.o \ gimple-builder.o \ gimple-expr.o \ + gimple-if-to-switch.o \ gimple-iterator.o \ gimple-fold.o \ gimple-laddress.o \ diff --git a/gcc/dbgcnt.def b/gcc/dbgcnt.def index a5b6bb66a6c..c0744b23f65 100644 --- a/gcc/dbgcnt.def +++ b/gcc/dbgcnt.def @@ -170,6 +170,7 @@ DEBUG_COUNTER (if_after_combine) DEBUG_COUNTER (if_after_reload) DEBUG_COUNTER (if_conversion) DEBUG_COUNTER (if_conversion_tree) +DEBUG_COUNTER (if_to_switch) DEBUG_COUNTER (ipa_cp_bits) DEBUG_COUNTER (ipa_cp_values) DEBUG_COUNTER (ipa_cp_vr) diff --git a/gcc/gimple-if-to-switch.cc b/gcc/gimple-if-to-switch.cc new file mode 100644 index 00000000000..d132064fb9b --- /dev/null +++ b/gcc/gimple-if-to-switch.cc @@ -0,0 +1,566 @@ +/* If-elseif-else to switch conversion pass + Copyright (C) 2020 Free Software Foundation, Inc. + +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 +. */ + +/* Algorithm of the pass runs in the following steps: + a) We walk basic blocks in DOMINATOR order so that we first reach + a first condition of a future switch. + b) We follow false edges of a if-else-chain and we record chain + of GIMPLE conditions. These blocks are only used for comparison + of a common SSA_NAME and we do not allow any side effect. + c) We remove all basic blocks (except first) of such chain and + GIMPLE switch replaces the condition in the first basic block. + d) We move all GIMPLE statements in the removed blocks into the + first one. */ + +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "backend.h" +#include "rtl.h" +#include "tree.h" +#include "gimple.h" +#include "tree-pass.h" +#include "ssa.h" +#include "gimple-pretty-print.h" +#include "fold-const.h" +#include "gimple-iterator.h" +#include "tree-cfg.h" +#include "tree-dfa.h" +#include "tree-cfgcleanup.h" +#include "alias.h" +#include "tree-ssa-loop.h" +#include "diagnostic.h" +#include "cfghooks.h" +#include "tree-into-ssa.h" +#include "cfganal.h" +#include "dbgcnt.h" +#include "target.h" +#include "alloc-pool.h" +#include "tree-switch-conversion.h" +#include "tree-ssa-reassoc.h" + +using namespace tree_switch_conversion; + +struct condition_info +{ + typedef vec> mapping_vec; + + condition_info (gcond *cond): m_cond (cond), m_bb (gimple_bb (cond)), + m_forwarder_bb (NULL), m_ranges (), m_true_edge (NULL), m_false_edge (NULL), + m_true_edge_phi_mapping (), m_false_edge_phi_mapping () + { + m_ranges.create (0); + } + + /* Recond PHI mapping for an original edge E and save these into + vector VEC. */ + void record_phi_mapping (edge e, mapping_vec *vec); + + gcond *m_cond; + basic_block m_bb; + basic_block m_forwarder_bb; + vec m_ranges; + edge m_true_edge; + edge m_false_edge; + mapping_vec m_true_edge_phi_mapping; + mapping_vec m_false_edge_phi_mapping; +}; + +/* Recond PHI mapping for an original edge E and save these into vector VEC. */ + +void +condition_info::record_phi_mapping (edge e, mapping_vec *vec) +{ + for (gphi_iterator gsi = gsi_start_phis (e->dest); !gsi_end_p (gsi); + gsi_next (&gsi)) + { + gphi *phi = gsi.phi (); + if (!virtual_operand_p (gimple_phi_result (phi))) + { + tree arg = PHI_ARG_DEF_FROM_EDGE (phi, e); + vec->safe_push (std::make_pair (phi, arg)); + } + } +} + +/* Master structure for one if to switch conversion candidate. */ + +struct if_chain +{ + /* Default constructor. */ + if_chain (): m_entries () + { + m_entries.create (2); + } + + /* Default destructor. */ + ~if_chain () + { + m_entries.release (); + } + + /* Verify that all case ranges do not overlap. */ + bool check_non_overlapping_cases (); + + /* Return true when the switch can be expanded with a jump table or + a bit test (at least partially). */ + bool is_beneficial (); + + /* If chain entries. */ + vec m_entries; +}; + +/* Compare two case ranges by minimum value. */ + +static int +range_cmp (const void *a, const void *b) +{ + const range_entry *re1 = *(const range_entry * const *) a; + const range_entry *re2 = *(const range_entry * const *) b; + + return tree_int_cst_compare (re1->low, re2->low); +} + +/* Verify that all case ranges do not overlap. */ + +bool +if_chain::check_non_overlapping_cases () +{ + auto_vec all_ranges; + for (unsigned i = 0; i < m_entries.length (); i++) + for (unsigned j = 0; j < m_entries[i]->m_ranges.length (); j++) + all_ranges.safe_push (&m_entries[i]->m_ranges[j]); + + all_ranges.qsort (range_cmp); + + for (unsigned i = 0; i < all_ranges.length () - 1; i++) + { + range_entry *left = all_ranges[i]; + range_entry *right = all_ranges[i + 1]; + if (tree_int_cst_le (left->low, right->low) + && tree_int_cst_le (right->low, left->high)) + return false; + } + + return true; +} + +/* Compare clusters by minimum value. */ + +static int +cluster_cmp (const void *a, const void *b) +{ + simple_cluster *sc1 = *(simple_cluster * const *) a; + simple_cluster *sc2 = *(simple_cluster * const *) b; + + return tree_int_cst_compare (sc1->get_low (), sc2->get_high ()); +} + +/* Dump constructed CLUSTERS with prefix MESSAGE. */ + +static void +dump_clusters (vec *clusters, const char *message) +{ + if (dump_file) + { + fprintf (dump_file, ";; %s: ", message); + for (unsigned i = 0; i < clusters->length (); i++) + (*clusters)[i]->dump (dump_file, dump_flags & TDF_DETAILS); + fprintf (dump_file, "\n"); + } +} + +/* Return true when the switch can be expanded with a jump table or + a bit test (at least partially). */ + +bool +if_chain::is_beneficial () +{ + profile_probability prob = profile_probability::uninitialized (); + + auto_vec clusters; + clusters.create (m_entries.length ()); + + for (unsigned i = 0; i < m_entries.length (); i++) + { + condition_info *info = m_entries[i]; + for (unsigned j = 0; j < info->m_ranges.length (); j++) + { + range_entry *range = &info->m_ranges[j]; + basic_block bb = info->m_true_edge->dest; + bool has_forwarder = !info->m_true_edge_phi_mapping.is_empty (); + clusters.safe_push (new simple_cluster (range->low, range->high, + NULL_TREE, bb, prob, + has_forwarder)); + } + } + + /* Sort clusters and merge them. */ + auto_vec filtered_clusters; + filtered_clusters.create (16); + clusters.qsort (cluster_cmp); + simple_cluster *left = static_cast (clusters[0]); + filtered_clusters.safe_push (left); + + for (unsigned i = 1; i < clusters.length (); i++) + { + simple_cluster *right = static_cast (clusters[i]); + tree type = TREE_TYPE (left->get_low ()); + if (!left->m_has_forward_bb + && !right->m_has_forward_bb + && left->m_case_bb == right->m_case_bb) + { + if (wi::eq_p (wi::to_wide (right->get_low ()) - wi::to_wide + (left->get_high ()), wi::one (TYPE_PRECISION (type)))) + { + left->set_high (right->get_high ()); + continue; + } + } + + left = static_cast (clusters[i]); + filtered_clusters.safe_push (left); + } + + dump_clusters (&filtered_clusters, "Canonical GIMPLE case clusters"); + + vec output + = jump_table_cluster::find_jump_tables (filtered_clusters); + bool r = output.length () < filtered_clusters.length (); + if (r) + dump_clusters (&output, "JT can be built"); + output.release (); + if (r) + return true; + + output = bit_test_cluster::find_bit_tests (filtered_clusters); + r = output.length () < filtered_clusters.length (); + if (r) + dump_clusters (&output, "BT can be built"); + output.release (); + return r; +} + +/* Build case label with MIN and MAX values of a given basic block DEST. */ + +static tree +build_case_label (tree index_type, tree min, tree max, basic_block dest) +{ + if (min != NULL_TREE && index_type != TREE_TYPE (min)) + min = fold_convert (index_type, min); + if (max != NULL_TREE && index_type != TREE_TYPE (max)) + max = fold_convert (index_type, max); + + tree label = gimple_block_label (dest); + return build_case_label (min, min == max ? NULL_TREE : max, label); +} + +/* Compare two integer constants. */ + +static int +label_cmp (const void *a, const void *b) +{ + const_tree l1 = *(const const_tree *) a; + const_tree l2 = *(const const_tree *) b; + + return tree_int_cst_compare (CASE_LOW (l1), CASE_LOW (l2)); +} + +/* Convert a given if CHAIN into a switch GIMPLE statement. */ + +static void +convert_if_conditions_to_switch (if_chain *chain) +{ + if (!dbg_cnt (if_to_switch)) + return; + + auto_vec labels; + unsigned entries = chain->m_entries.length (); + condition_info *first_cond = chain->m_entries[0]; + condition_info *last_cond = chain->m_entries[entries - 1]; + + edge default_edge = last_cond->m_false_edge; + basic_block default_bb = default_edge->dest; + + gimple_stmt_iterator gsi = gsi_for_stmt (first_cond->m_cond); + tree index_type = TREE_TYPE (first_cond->m_ranges[0].exp); + for (unsigned i = 0; i < entries; i++) + { + condition_info *info = chain->m_entries[i]; + basic_block case_bb = info->m_true_edge->dest; + + /* Create a forwarder block if needed. */ + if (!info->m_true_edge_phi_mapping.is_empty ()) + { + info->m_forwarder_bb = split_edge (info->m_true_edge); + case_bb = info->m_forwarder_bb; + } + + for (unsigned j = 0; j < info->m_ranges.length (); j++) + labels.safe_push (build_case_label (index_type, + info->m_ranges[j].low, + info->m_ranges[j].high, + case_bb)); + default_bb = info->m_false_edge->dest; + + if (i == 0) + { + remove_edge (first_cond->m_true_edge); + remove_edge (first_cond->m_false_edge); + } + else + delete_basic_block (info->m_bb); + + make_edge (first_cond->m_bb, case_bb, 0); + } + + labels.qsort (label_cmp); + + edge e = find_edge (first_cond->m_bb, default_bb); + if (e == NULL) + e = make_edge (first_cond->m_bb, default_bb, 0); + gswitch *s + = gimple_build_switch (first_cond->m_ranges[0].exp, + build_case_label (index_type, NULL_TREE, + NULL_TREE, default_bb), + labels); + + gsi_remove (&gsi, true); + gsi_insert_before (&gsi, s, GSI_NEW_STMT); + + if (dump_file) + { + fprintf (dump_file, "Expanded into a new gimple STMT: "); + print_gimple_stmt (dump_file, s, 0, TDF_SLIM); + putc ('\n', dump_file); + } + + /* Fill up missing PHI node arguments. */ + for (unsigned i = 0; i < chain->m_entries.length (); ++i) + { + condition_info *info = chain->m_entries[i]; + for (unsigned j = 0; j < info->m_true_edge_phi_mapping.length (); ++j) + { + std::pair item = info->m_true_edge_phi_mapping[j]; + add_phi_arg (item.first, item.second, + single_succ_edge (info->m_forwarder_bb), + UNKNOWN_LOCATION); + } + } + + /* Fill up missing PHI nodes for the default BB. */ + for (unsigned j = 0; j < last_cond->m_false_edge_phi_mapping.length (); ++j) + { + std::pair item = last_cond->m_false_edge_phi_mapping[j]; + add_phi_arg (item.first, item.second, e, UNKNOWN_LOCATION); + } +} + +/* Identify an index variable used in BB in a GIMPLE condition. + Save information about the condition into CONDITIONS_IN_BBS. */ + +static void +find_conditions (basic_block bb, + hash_map *conditions_in_bbs) +{ + gimple_stmt_iterator gsi = gsi_last_nondebug_bb (bb); + if (gsi_end_p (gsi)) + return; + + gcond *cond = dyn_cast (gsi_stmt (gsi)); + if (cond == NULL) + return; + + if (!no_side_effect_bb (bb)) + return; + + tree lhs = gimple_cond_lhs (cond); + tree rhs = gimple_cond_rhs (cond); + tree_code code = gimple_cond_code (cond); + + condition_info info (cond); + + gassign *def; + if (code == NE_EXPR + && TREE_CODE (lhs) == SSA_NAME + && (def = dyn_cast (SSA_NAME_DEF_STMT (lhs))) != NULL + && integer_zerop (rhs)) + { + enum tree_code rhs_code = gimple_assign_rhs_code (def); + if (rhs_code == BIT_IOR_EXPR) + { + info.m_ranges.safe_grow (2, true); + init_range_entry (&info.m_ranges[0], gimple_assign_rhs1 (def), NULL); + init_range_entry (&info.m_ranges[1], gimple_assign_rhs2 (def), NULL); + } + } + else + { + info.m_ranges.safe_grow (1, true); + init_range_entry (&info.m_ranges[0], NULL_TREE, cond); + } + + /* All identified ranges must have equal expression and IN_P flag. */ + if (!info.m_ranges.is_empty ()) + { + edge true_edge, false_edge; + tree expr = info.m_ranges[0].exp; + bool in_p = info.m_ranges[0].in_p; + + extract_true_false_edges_from_block (bb, &true_edge, &false_edge); + info.m_true_edge = in_p ? true_edge : false_edge; + info.m_false_edge = in_p ? false_edge : true_edge; + + for (unsigned i = 0; i < info.m_ranges.length (); ++i) + if (info.m_ranges[i].exp == NULL_TREE + || info.m_ranges[i].low == NULL_TREE + || info.m_ranges[i].high == NULL_TREE) + return; + + for (unsigned i = 1; i < info.m_ranges.length (); ++i) + if (info.m_ranges[i].exp != expr + || info.m_ranges[i].in_p != in_p) + return; + + info.record_phi_mapping (info.m_true_edge, + &info.m_true_edge_phi_mapping); + info.record_phi_mapping (info.m_false_edge, + &info.m_false_edge_phi_mapping); + conditions_in_bbs->put (bb, info); + } + +} + +namespace { + +const pass_data pass_data_if_to_switch = +{ + GIMPLE_PASS, /* type */ + "iftoswitch", /* name */ + OPTGROUP_NONE, /* optinfo_flags */ + TV_TREE_IF_TO_SWITCH, /* tv_id */ + ( PROP_cfg | PROP_ssa ), /* properties_required */ + 0, /* properties_provided */ + 0, /* properties_destroyed */ + 0, /* todo_flags_start */ + TODO_cleanup_cfg | TODO_update_ssa /* todo_flags_finish */ +}; + +class pass_if_to_switch : public gimple_opt_pass +{ +public: + pass_if_to_switch (gcc::context *ctxt) + : gimple_opt_pass (pass_data_if_to_switch, ctxt) + {} + + /* opt_pass methods: */ + virtual bool gate (function *) + { + return (jump_table_cluster::is_enabled () + || bit_test_cluster::is_enabled ()); + } + + virtual unsigned int execute (function *); + +}; // class pass_if_to_switch + +unsigned int +pass_if_to_switch::execute (function *fun) +{ + auto_vec all_candidates; + hash_map conditions_in_bbs; + + basic_block bb; + FOR_EACH_BB_FN (bb, fun) + find_conditions (bb, &conditions_in_bbs); + + if (conditions_in_bbs.is_empty ()) + return 0; + + int *rpo = XNEWVEC (int, n_basic_blocks_for_fn (fun)); + unsigned n = pre_and_rev_post_order_compute_fn (fun, NULL, rpo, false); + + auto_bitmap seen_bbs; + for (int i = n - 1; i >= 0; --i) + { + basic_block bb = BASIC_BLOCK_FOR_FN (fun, rpo[i]); + if (bitmap_bit_p (seen_bbs, bb->index)) + continue; + + bitmap_set_bit (seen_bbs, bb->index); + condition_info *info = conditions_in_bbs.get (bb); + if (info) + { + if_chain *chain = new if_chain (); + chain->m_entries.safe_push (info); + /* Try to find a chain starting in this BB. */ + while (true) + { + if (!single_pred_p (gimple_bb (info->m_cond))) + break; + edge e = single_pred_edge (gimple_bb (info->m_cond)); + condition_info *info2 = conditions_in_bbs.get (e->src); + if (!info2 || info->m_ranges[0].exp != info2->m_ranges[0].exp) + break; + + chain->m_entries.safe_push (info2); + bitmap_set_bit (seen_bbs, e->src->index); + info = info2; + } + + chain->m_entries.reverse (); + if (chain->m_entries.length () >= 3 + && chain->check_non_overlapping_cases () + && chain->is_beneficial ()) + { + gcond *cond = chain->m_entries[0]->m_cond; + if (dump_enabled_p ()) + dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, cond, + "Condition chain with %d BBs " + "transformed into a switch statement.\n", + chain->m_entries.length ()); + all_candidates.safe_push (chain); + } + } + } + + for (unsigned i = 0; i < all_candidates.length (); i++) + { + convert_if_conditions_to_switch (all_candidates[i]); + delete all_candidates[i]; + } + + free (rpo); + + if (!all_candidates.is_empty ()) + { + free_dominance_info (CDI_DOMINATORS); + mark_virtual_operands_for_renaming (fun); + } + + return 0; +} + +} // anon namespace + +gimple_opt_pass * +make_pass_if_to_switch (gcc::context *ctxt) +{ + return new pass_if_to_switch (ctxt); +} diff --git a/gcc/passes.def b/gcc/passes.def index fc56e695b60..21b2e2af0f7 100644 --- a/gcc/passes.def +++ b/gcc/passes.def @@ -94,6 +94,7 @@ along with GCC; see the file COPYING3. If not see NEXT_PASS (pass_phiopt, true /* early_p */); NEXT_PASS (pass_modref); NEXT_PASS (pass_tail_recursion); + NEXT_PASS (pass_if_to_switch); NEXT_PASS (pass_convert_switch); NEXT_PASS (pass_cleanup_eh); NEXT_PASS (pass_profile); diff --git a/gcc/testsuite/g++.dg/tree-ssa/if-to-switch-1.C b/gcc/testsuite/g++.dg/tree-ssa/if-to-switch-1.C new file mode 100644 index 00000000000..88505e8869f --- /dev/null +++ b/gcc/testsuite/g++.dg/tree-ssa/if-to-switch-1.C @@ -0,0 +1,25 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-iftoswitch-optimized" } */ + +void fancy_abort(const char *, int, const char *); + +enum machine_mode +{ + MODE_FLOAT, + MODE_DECIMAL_FLOAT, + MODE_COMPLEX_INT, + MODE_COMPLEX_FLOAT, + MODE_VECTOR_BOOL, + MODE_VECTOR_FLOAT +} extern const mode_class; + +void tree_node() { + if (mode_class) + mode_class == MODE_FLOAT || mode_class == MODE_DECIMAL_FLOAT || + mode_class == MODE_COMPLEX_FLOAT || mode_class == MODE_VECTOR_FLOAT + ? fancy_abort("aaa", 2, __FUNCTION__), + 0 : 0; + int g = 0; +} + +/* { dg-final { scan-tree-dump "Condition chain with 3 BBs transformed into a switch statement." "iftoswitch" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-1.c b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-1.c new file mode 100644 index 00000000000..92df4e93bfa --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-1.c @@ -0,0 +1,35 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-iftoswitch-optimized" } */ + +int global; +int foo (); + +int main(int argc, char **argv) +{ + if (argc == 1) + foo (); + else if (argc == 2) + { + global += 1; + } + else if (argc == 3) + { + foo (); + foo (); + } + else if (argc == 4) + { + foo (); + } + else if (argc == 5) + { + global = 2; + } + else + global -= 123; + + global -= 12; + return 0; +} + +/* { dg-final { scan-tree-dump "Condition chain with 5 BBs transformed into a switch statement." "iftoswitch" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-2.c b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-2.c new file mode 100644 index 00000000000..36e62ae5be1 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-2.c @@ -0,0 +1,11 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-iftoswitch-optimized" } */ + +int IsHTMLWhitespaceNoRange(int aChar) +{ + return aChar == 0x0001 || aChar == 0x000A || + aChar == 0x000C || aChar == 0x000E || + aChar == 0x0020; +} + +/* { dg-final { scan-tree-dump "Condition chain with 3 BBs transformed into a switch statement." "iftoswitch" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-3.c b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-3.c new file mode 100644 index 00000000000..9a4ce160238 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-3.c @@ -0,0 +1,11 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-iftoswitch-optimized" } */ + +int IsHTMLWhitespace(int aChar) +{ + return aChar == 0x0009 || aChar == 0x000A || + aChar == 0x000C || aChar == 0x000D || + aChar == 0x0020 || aChar == 0x0030; +} + +/* { dg-final { scan-tree-dump "Condition chain with 3 BBs transformed into a switch statement." "iftoswitch" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-4.c b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-4.c new file mode 100644 index 00000000000..6a035883457 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-4.c @@ -0,0 +1,36 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-iftoswitch-optimized" } */ + +int global; +int foo (); + +int main(int argc, char **argv) +{ + if (argc == 1) + foo (); + else if (argc == 2) + { + global += 1; + } + else if (argc == 3) + { + foo (); + foo (); + } + else if (argc == 4) + { + foo (); + } + /* This will be removed with EVRP. */ + else if (argc == 1) + { + global = 2; + } + else + global -= 123; + + global -= 12; + return 0; +} + +/* { dg-final { scan-tree-dump-not "Condition chain" "iftoswitch" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-5.c b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-5.c new file mode 100644 index 00000000000..7734a58500b --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-5.c @@ -0,0 +1,12 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-iftoswitch-optimized" } */ + +int crud (unsigned char c) +{ + return (((((((((((int) c == 46) || (int) c == 44) + || (int) c == 58) || (int) c == 59) || (int) c == 60) + || (int) c == 62) || (int) c == 34) || (int) c == 92) + || (int) c == 39) != 0); +} + +/* { dg-final { scan-tree-dump "Condition chain with 5 BBs transformed into a switch statement." "iftoswitch" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-6.c b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-6.c new file mode 100644 index 00000000000..464b1fbd124 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-6.c @@ -0,0 +1,42 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-iftoswitch-optimized" } */ + +int global; +int foo (); + +int main(int argc, char **argv) +{ + if (argc >= 1 && argc <= 10) + foo (); + else if (argc == 12) + { + global += 1; + } + else if (argc == 13) + { + foo (); + foo (); + } + else if (argc == 14) + { + foo (); + } + /* This will be removed with EVRP. */ + else if (argc == 5) + { + global = 2; + } + /* This will be removed with EVRP. */ + else if (argc >= 7 && argc <= 9) + { + global = 2; + } + + else + global -= 123; + + global -= 12; + return 0; +} + +/* { dg-final { scan-tree-dump-not "Condition chain" "iftoswitch" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-7.c b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-7.c new file mode 100644 index 00000000000..4a176f1a613 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-7.c @@ -0,0 +1,25 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-iftoswitch-optimized" } */ + +int global; + +int foo(int a) +{ + int x = 0; + for (unsigned i = 0; i < a; i++) + { + if (a == 2) + { + global += 123; + x = 1; + } + else if (a == 3) + x = 2; + else if (a == 10) + x = 3; + } + + return x; +} + +/* { dg-final { scan-tree-dump-not "Condition chain " "iftoswitch" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-8.c b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-8.c new file mode 100644 index 00000000000..f43ce7daf78 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/if-to-switch-8.c @@ -0,0 +1,27 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-iftoswitch-optimized" } */ + +int global; +int global1; +int global2; +int global3; + +int foo(int a, int b) +{ + int x = 0; + for (unsigned i = 0; i < a; i++) + { + if (b == 1) + global += 2; + else if (a == 2) + global = 123; + else if (a == 3) + global1 = 1234; + else if (a == 10) + global2 = 12345; + else if (a == 1) + global2 = 123456; + } +} + +/* { dg-final { scan-tree-dump-not "Condition chain" "iftoswitch" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr96480.c b/gcc/testsuite/gcc.dg/tree-ssa/pr96480.c index f2a91ef9909..cc04721c1df 100644 --- a/gcc/testsuite/gcc.dg/tree-ssa/pr96480.c +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr96480.c @@ -1,6 +1,6 @@ /* PR tree-optimization/96480 */ /* { dg-do compile } */ -/* { dg-options "-O2 -fdump-tree-optimized" } */ +/* { dg-options "-O2 -fdump-tree-optimized -fno-bit-tests" } */ /* { dg-final { scan-tree-dump " = _\[0-9]* <= 3;" "optimized" } } */ int v[4]; diff --git a/gcc/testsuite/gcc.dg/tree-ssa/reassoc-32.c b/gcc/testsuite/gcc.dg/tree-ssa/reassoc-32.c index 944362ad076..093e7a57a27 100644 --- a/gcc/testsuite/gcc.dg/tree-ssa/reassoc-32.c +++ b/gcc/testsuite/gcc.dg/tree-ssa/reassoc-32.c @@ -1,6 +1,6 @@ /* { dg-do run { target { ! "m68k*-*-* mmix*-*-* bfin*-*-* v850*-*-* moxie*-*-* cris*-*-* m32c*-*-* fr30*-*-* mcore*-*-* powerpc*-*-* xtensa*-*-*"} } } */ -/* { dg-options "-O2 -fno-inline -fdump-tree-reassoc1-details --param logical-op-non-short-circuit=1" } */ +/* { dg-options "-O2 -fno-inline -fdump-tree-reassoc1-details --param logical-op-non-short-circuit=1 -fno-bit-tests" } */ /* { dg-additional-options "-mbranch-cost=2" { target branch_cost } } */ diff --git a/gcc/timevar.def b/gcc/timevar.def index a3031799700..1cf2300ecda 100644 --- a/gcc/timevar.def +++ b/gcc/timevar.def @@ -293,6 +293,7 @@ DEFTIMEVAR (TV_VAR_TRACKING , "variable tracking") DEFTIMEVAR (TV_VAR_TRACKING_DATAFLOW , "var-tracking dataflow") DEFTIMEVAR (TV_VAR_TRACKING_EMIT , "var-tracking emit") DEFTIMEVAR (TV_TREE_IFCOMBINE , "tree if-combine") +DEFTIMEVAR (TV_TREE_IF_TO_SWITCH , "if to switch conversion") DEFTIMEVAR (TV_TREE_UNINIT , "uninit var analysis") DEFTIMEVAR (TV_PLUGIN_INIT , "plugin initialization") DEFTIMEVAR (TV_PLUGIN_RUN , "plugin execution") diff --git a/gcc/tree-pass.h b/gcc/tree-pass.h index cc4870e9711..450a379bac7 100644 --- a/gcc/tree-pass.h +++ b/gcc/tree-pass.h @@ -379,6 +379,7 @@ extern gimple_opt_pass *make_pass_empty_loop (gcc::context *ctxt); extern gimple_opt_pass *make_pass_graphite (gcc::context *ctxt); extern gimple_opt_pass *make_pass_graphite_transforms (gcc::context *ctxt); extern gimple_opt_pass *make_pass_if_conversion (gcc::context *ctxt); +extern gimple_opt_pass *make_pass_if_to_switch (gcc::context *ctxt); extern gimple_opt_pass *make_pass_loop_distribution (gcc::context *ctxt); extern gimple_opt_pass *make_pass_vectorize (gcc::context *ctxt); extern gimple_opt_pass *make_pass_simduid_cleanup (gcc::context *ctxt); diff --git a/gcc/tree-ssa-reassoc.c b/gcc/tree-ssa-reassoc.c index 89adafae32c..e594230436d 100644 --- a/gcc/tree-ssa-reassoc.c +++ b/gcc/tree-ssa-reassoc.c @@ -51,6 +51,7 @@ along with GCC; see the file COPYING3. If not see #include "builtins.h" #include "gimplify.h" #include "case-cfn-macros.h" +#include "tree-ssa-reassoc.h" /* This is a simple global reassociation pass. It is, in part, based on the LLVM pass of the same name (They do some things more/less @@ -188,15 +189,6 @@ static struct int pows_created; } reassociate_stats; -/* Operator, rank pair. */ -struct operand_entry -{ - unsigned int rank; - unsigned int id; - tree op; - unsigned int count; - gimple *stmt_to_insert; -}; static object_allocator operand_entry_pool ("operand entry pool"); @@ -226,7 +218,7 @@ static bool reassoc_stmt_dominates_stmt_p (gimple *, gimple *); /* Wrapper around gsi_remove, which adjusts gimple_uid of debug stmts possibly added by gsi_remove. */ -bool +static bool reassoc_remove_stmt (gimple_stmt_iterator *gsi) { gimple *stmt = gsi_stmt (*gsi); @@ -2408,18 +2400,7 @@ optimize_ops_list (enum tree_code opcode, For more information see comments above fold_test_range in fold-const.c, this implementation is for GIMPLE. */ -struct range_entry -{ - tree exp; - tree low; - tree high; - bool in_p; - bool strict_overflow_p; - unsigned int idx, next; -}; -void dump_range_entry (FILE *file, struct range_entry *r); -void debug_range_entry (struct range_entry *r); /* Dump the range entry R to FILE, skipping its expression if SKIP_EXP. */ @@ -2449,7 +2430,7 @@ debug_range_entry (struct range_entry *r) an SSA_NAME and STMT argument is ignored, otherwise STMT argument should be a GIMPLE_COND. */ -static void +void init_range_entry (struct range_entry *r, tree exp, gimple *stmt) { int in_p; @@ -4286,7 +4267,7 @@ suitable_cond_bb (basic_block bb, basic_block test_bb, basic_block *other_bb, range test optimization, all SSA_NAMEs set in the bb are consumed in the bb and there are no PHIs. */ -static bool +bool no_side_effect_bb (basic_block bb) { gimple_stmt_iterator gsi; diff --git a/gcc/tree-ssa-reassoc.h b/gcc/tree-ssa-reassoc.h new file mode 100644 index 00000000000..dc7f59f1eca --- /dev/null +++ b/gcc/tree-ssa-reassoc.h @@ -0,0 +1,48 @@ +/* Reassociation for trees. + Copyright (C) 2020 Free Software Foundation, Inc. + +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 +. */ + +#ifndef GCC_SSA_REASSOC_H +#define GCC_SSA_REASSOC_H + +/* Operator, rank pair. */ +struct operand_entry +{ + unsigned int rank; + unsigned int id; + tree op; + unsigned int count; + gimple *stmt_to_insert; +}; + +struct range_entry +{ + tree exp; + tree low; + tree high; + bool in_p; + bool strict_overflow_p; + unsigned int idx, next; +}; + +void dump_range_entry (FILE *file, struct range_entry *r); +void debug_range_entry (struct range_entry *r); +void init_range_entry (struct range_entry *r, tree exp, gimple *stmt); +bool no_side_effect_bb (basic_block bb); + +#endif /* GCC_SSA_REASSOC_H */ diff --git a/gcc/tree-switch-conversion.h b/gcc/tree-switch-conversion.h index 7515e952eb3..62cfde168c8 100644 --- a/gcc/tree-switch-conversion.h +++ b/gcc/tree-switch-conversion.h @@ -48,8 +48,8 @@ class cluster { public: /* Constructor. */ - cluster (tree case_label_expr, basic_block case_bb, profile_probability prob, - profile_probability subtree_prob); + inline cluster (tree case_label_expr, basic_block case_bb, + profile_probability prob, profile_probability subtree_prob); /* Destructor. */ virtual ~cluster () @@ -121,8 +121,9 @@ class simple_cluster: public cluster { public: /* Constructor. */ - simple_cluster (tree low, tree high, tree case_label_expr, - basic_block case_bb, profile_probability prob); + inline simple_cluster (tree low, tree high, tree case_label_expr, + basic_block case_bb, profile_probability prob, + bool has_forward_bb = false); /* Destructor. */ ~simple_cluster () @@ -146,6 +147,11 @@ public: return m_high; } + void set_high (tree high) + { + m_high = high; + } + void debug () { @@ -182,12 +188,16 @@ public: /* True if case is a range. */ bool m_range_p; + + /* True if the case will use a forwarder BB. */ + bool m_has_forward_bb; }; simple_cluster::simple_cluster (tree low, tree high, tree case_label_expr, - basic_block case_bb, profile_probability prob): + basic_block case_bb, profile_probability prob, + bool has_forward_bb): cluster (case_label_expr, case_bb, prob, prob), - m_low (low), m_high (high) + m_low (low), m_high (high), m_has_forward_bb (has_forward_bb) { m_range_p = m_high != NULL; if (m_high == NULL) @@ -271,7 +281,7 @@ public: static inline unsigned int case_values_threshold (void); /* Return whether jump table expansion is allowed. */ - static bool is_enabled (void); + static inline bool is_enabled (void); }; /* A GIMPLE switch statement can be expanded to a short sequence of bit-wise -- 2.29.2