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gcc9
gcc9-value-prof.patch
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File gcc9-value-prof.patch of Package gcc9
# The patch is backport of following revisions: # git repo: https://github.com/marxin/gcc/tree/single-value-profile-gcc-9 # r272179 # r272143 # r272116 # r272114 # r272111 # r272108 # r272107 # r272106 # r272030 diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 29585cf15aa..af940fa66d4 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -12128,9 +12128,6 @@ will not try to thread through its block. Maximum number of nested calls to search for control dependencies during uninitialized variable analysis. -@item indir-call-topn-profile -Track top N target addresses in indirect-call profile. - @item max-once-peeled-insns The maximum number of insns of a peeled loop that rolls only once. diff --git a/gcc/gcov-counter.def b/gcc/gcov-counter.def index 3a0e620987a..b0596c8dc6b 100644 --- a/gcc/gcov-counter.def +++ b/gcc/gcov-counter.def @@ -49,6 +49,3 @@ DEF_GCOV_COUNTER(GCOV_COUNTER_IOR, "ior", _ior) /* Time profile collecting first run of a function */ DEF_GCOV_COUNTER(GCOV_TIME_PROFILER, "time_profiler", _time_profile) - -/* Top N value tracking for indirect calls. */ -DEF_GCOV_COUNTER(GCOV_COUNTER_ICALL_TOPNV, "indirect_call_topn", _icall_topn) diff --git a/gcc/gcov-io.h b/gcc/gcov-io.h index 9edb2923982..0f2905c17ec 100644 --- a/gcc/gcov-io.h +++ b/gcc/gcov-io.h @@ -266,11 +266,12 @@ GCOV_COUNTERS #define GCOV_N_VALUE_COUNTERS \ (GCOV_LAST_VALUE_COUNTER - GCOV_FIRST_VALUE_COUNTER + 1) -/* The number of hottest callees to be tracked. */ -#define GCOV_ICALL_TOPN_VAL 2 +/* Number of single value histogram values that live + on disk representation. */ +#define GCOV_DISK_SINGLE_VALUES 4 -/* The number of counter entries per icall callsite. */ -#define GCOV_ICALL_TOPN_NCOUNTS (1 + GCOV_ICALL_TOPN_VAL * 4) +/* Total number of single value counters. */ +#define GCOV_SINGLE_VALUE_COUNTERS (2 * GCOV_DISK_SINGLE_VALUES + 1) /* Convert a counter index to a tag. */ #define GCOV_TAG_FOR_COUNTER(COUNT) \ diff --git a/gcc/ipa-icf.c b/gcc/ipa-icf.c index e4c9dda0df1..91425022036 100644 --- a/gcc/ipa-icf.c +++ b/gcc/ipa-icf.c @@ -2768,20 +2768,20 @@ sem_item_optimizer::build_graph (void) void sem_item_optimizer::parse_nonsingleton_classes (void) { - unsigned int init_called_count = 0; + unsigned int counter = 0; for (unsigned i = 0; i < m_items.length (); i++) if (m_items[i]->cls->members.length () > 1) { m_items[i]->init (); - init_called_count++; + ++counter; } if (dump_file) - fprintf (dump_file, "Init called for %u items (%.2f%%).\n", - init_called_count, - m_items.length () ? 100.0f * init_called_count / m_items.length () - : 0.0f); + { + float f = m_items.length () ? 100.0f * counter / m_items.length () : 0.0f; + fprintf (dump_file, "Init called for %u items (%.2f%%).\n", counter, f); + } } /* Equality function for semantic items is used to subdivide existing @@ -3300,13 +3300,9 @@ sem_item_optimizer::dump_cong_classes (void) if (!dump_file) return; - fprintf (dump_file, - "Congruence classes: %u (unique hash values: %lu), with total: " - "%u items\n", m_classes_count, - (unsigned long) m_classes.elements (), m_items.length ()); - /* Histogram calculation. */ unsigned int max_index = 0; + unsigned int single_element_classes = 0; unsigned int* histogram = XCNEWVEC (unsigned int, m_items.length () + 1); for (hash_table<congruence_class_hash>::iterator it = m_classes.begin (); @@ -3318,21 +3314,25 @@ sem_item_optimizer::dump_cong_classes (void) if (c > max_index) max_index = c; + + if (c == 1) + ++single_element_classes; } + fprintf (dump_file, + "Congruence classes: %lu with total: %u items (in a non-singular " + "class: %u)\n", (unsigned long) m_classes.elements (), + m_items.length (), m_items.length () - single_element_classes); fprintf (dump_file, "Class size histogram [num of members]: number of classe number " "of classess\n"); - for (unsigned int i = 0; i <= max_index; i++) if (histogram[i]) - fprintf (dump_file, "[%u]: %u classes\n", i, histogram[i]); - - fprintf (dump_file, "\n\n"); + fprintf (dump_file, "%6u: %6u\n", i, histogram[i]); if (dump_flags & TDF_DETAILS) - for (hash_table<congruence_class_hash>::iterator it = m_classes.begin (); - it != m_classes.end (); ++it) + for (hash_table<congruence_class_hash>::iterator it = m_classes.begin (); + it != m_classes.end (); ++it) { fprintf (dump_file, " group: with %u classes:\n", (*it)->classes.length ()); diff --git a/gcc/ipa-profile.c b/gcc/ipa-profile.c index de9563d808c..c80ea7a9b95 100644 --- a/gcc/ipa-profile.c +++ b/gcc/ipa-profile.c @@ -191,17 +191,17 @@ ipa_profile_generate_summary (void) takes away bad histograms. */ if (h) { - /* counter 0 is target, counter 1 is number of execution we called target, - counter 2 is total number of executions. */ - if (h->hvalue.counters[2]) + gcov_type val, count, all; + if (get_most_common_single_value (NULL, "indirect call", + h, &val, &count, &all)) { struct cgraph_edge * e = node->get_edge (stmt); if (e && !e->indirect_unknown_callee) continue; - e->indirect_info->common_target_id - = h->hvalue.counters [0]; + + e->indirect_info->common_target_id = val; e->indirect_info->common_target_probability - = GCOV_COMPUTE_SCALE (h->hvalue.counters [1], h->hvalue.counters [2]); + = GCOV_COMPUTE_SCALE (count, all); if (e->indirect_info->common_target_probability > REG_BR_PROB_BASE) { if (dump_file) diff --git a/gcc/params.def b/gcc/params.def index 3c9c5fc0f13..f38798a60c4 100644 --- a/gcc/params.def +++ b/gcc/params.def @@ -992,14 +992,6 @@ DEFPARAM (PARAM_PROFILE_FUNC_INTERNAL_ID, "Use internal function id in profile lookup.", 0, 0, 1) -/* When the parameter is 1, track the most frequent N target - addresses in indirect-call profile. This disables - indirect_call_profiler_v3 which tracks single target. */ -DEFPARAM (PARAM_INDIR_CALL_TOPN_PROFILE, - "indir-call-topn-profile", - "Track top N target addresses in indirect-call profile.", - 0, 0, 1) - /* Avoid SLP vectorization of large basic blocks. */ DEFPARAM (PARAM_SLP_MAX_INSNS_IN_BB, "slp-max-insns-in-bb", diff --git a/gcc/profile.c b/gcc/profile.c index a1dba1ac8fb..9aff9ef2b21 100644 --- a/gcc/profile.c +++ b/gcc/profile.c @@ -172,7 +172,6 @@ instrument_values (histogram_values values) break; case HIST_TYPE_INDIR_CALL: - case HIST_TYPE_INDIR_CALL_TOPN: gimple_gen_ic_profiler (hist, t, 0); break; diff --git a/gcc/testsuite/gcc.dg/ipa/pr68035.c b/gcc/testsuite/gcc.dg/ipa/pr68035.c index a8cb77971f6..f6adad9f24d 100644 --- a/gcc/testsuite/gcc.dg/ipa/pr68035.c +++ b/gcc/testsuite/gcc.dg/ipa/pr68035.c @@ -105,4 +105,4 @@ list_49, }; -/* { dg-final { scan-ipa-dump "unique hash values: 51" "icf" } } */ +/* { dg-final { scan-ipa-dump "Congruence classes: 51" "icf" } } */ diff --git a/gcc/testsuite/gcc.dg/no_profile_instrument_function-attr-1.c b/gcc/testsuite/gcc.dg/no_profile_instrument_function-attr-1.c index 41d745532fa..0c7e0961824 100644 --- a/gcc/testsuite/gcc.dg/no_profile_instrument_function-attr-1.c +++ b/gcc/testsuite/gcc.dg/no_profile_instrument_function-attr-1.c @@ -19,6 +19,6 @@ int main () } /* { dg-final { scan-tree-dump-times "__gcov0\\.main.* = PROF_edge_counter" 1 "optimized"} } */ -/* { dg-final { scan-tree-dump-times "__gcov_indirect_call_profiler_v3" 1 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "__gcov_indirect_call_profiler_v" 1 "optimized" } } */ /* { dg-final { scan-tree-dump-times "__gcov_time_profiler_counter = " 1 "optimized" } } */ /* { dg-final { scan-tree-dump-times "__gcov_init" 1 "optimized" } } */ diff --git a/gcc/tree-profile.c b/gcc/tree-profile.c index 9b6f351a3d6..5ca4c3e80b6 100644 --- a/gcc/tree-profile.c +++ b/gcc/tree-profile.c @@ -101,11 +101,7 @@ init_ic_make_global_vars (void) ic_tuple_var = build_decl (UNKNOWN_LOCATION, VAR_DECL, - get_identifier ( - (PARAM_VALUE (PARAM_INDIR_CALL_TOPN_PROFILE) ? - "__gcov_indirect_call_topn" : - "__gcov_indirect_call")), - tuple_type); + get_identifier ("__gcov_indirect_call"), tuple_type); TREE_PUBLIC (ic_tuple_var) = 1; DECL_ARTIFICIAL (ic_tuple_var) = 1; DECL_INITIAL (ic_tuple_var) = NULL; @@ -169,10 +165,10 @@ gimple_init_gcov_profiler (void) = build_function_type_list (void_type_node, gcov_type_ptr, gcov_type_node, NULL_TREE); - fn_name = concat ("__gcov_one_value_profiler", fn_suffix, NULL); + fn_name = concat ("__gcov_one_value_profiler_v2", fn_suffix, NULL); tree_one_value_profiler_fn = build_fn_decl (fn_name, one_value_profiler_fn_type); - free (CONST_CAST (char *, fn_name)); + TREE_NOTHROW (tree_one_value_profiler_fn) = 1; DECL_ATTRIBUTES (tree_one_value_profiler_fn) = tree_cons (get_identifier ("leaf"), NULL, @@ -186,9 +182,7 @@ gimple_init_gcov_profiler (void) gcov_type_node, ptr_type_node, NULL_TREE); - profiler_fn_name = "__gcov_indirect_call_profiler_v3"; - if (PARAM_VALUE (PARAM_INDIR_CALL_TOPN_PROFILE)) - profiler_fn_name = "__gcov_indirect_call_topn_profiler"; + profiler_fn_name = "__gcov_indirect_call_profiler_v4"; tree_indirect_call_profiler_fn = build_fn_decl (profiler_fn_name, ic_profiler_fn_type); @@ -376,12 +370,6 @@ gimple_gen_ic_profiler (histogram_value value, unsigned tag, unsigned base) gimple_stmt_iterator gsi = gsi_for_stmt (stmt); tree ref_ptr = tree_coverage_counter_addr (tag, base); - if ( (PARAM_VALUE (PARAM_INDIR_CALL_TOPN_PROFILE) && - tag == GCOV_COUNTER_V_INDIR) || - (!PARAM_VALUE (PARAM_INDIR_CALL_TOPN_PROFILE) && - tag == GCOV_COUNTER_ICALL_TOPNV)) - return; - ref_ptr = force_gimple_operand_gsi (&gsi, ref_ptr, true, NULL_TREE, true, GSI_SAME_STMT); diff --git a/gcc/value-prof.c b/gcc/value-prof.c index 5013956cf86..6fda339a3c2 100644 --- a/gcc/value-prof.c +++ b/gcc/value-prof.c @@ -228,109 +228,77 @@ dump_histogram_value (FILE *dump_file, histogram_value hist) switch (hist->type) { case HIST_TYPE_INTERVAL: - fprintf (dump_file, "Interval counter range %d -- %d", - hist->hdata.intvl.int_start, - (hist->hdata.intvl.int_start - + hist->hdata.intvl.steps - 1)); if (hist->hvalue.counters) { - unsigned int i; - fprintf (dump_file, " ["); - for (i = 0; i < hist->hdata.intvl.steps; i++) - fprintf (dump_file, " %d:%" PRId64, - hist->hdata.intvl.int_start + i, - (int64_t) hist->hvalue.counters[i]); - fprintf (dump_file, " ] outside range:%" PRId64, - (int64_t) hist->hvalue.counters[i]); + fprintf (dump_file, "Interval counter range [%d,%d]: [", + hist->hdata.intvl.int_start, + (hist->hdata.intvl.int_start + + hist->hdata.intvl.steps - 1)); + + unsigned int i; + for (i = 0; i < hist->hdata.intvl.steps; i++) + { + fprintf (dump_file, "%d:%" PRId64, + hist->hdata.intvl.int_start + i, + (int64_t) hist->hvalue.counters[i]); + if (i != hist->hdata.intvl.steps - 1) + fprintf (dump_file, ", "); + } + fprintf (dump_file, "] outside range: %" PRId64 ".\n", + (int64_t) hist->hvalue.counters[i]); } - fprintf (dump_file, ".\n"); break; case HIST_TYPE_POW2: - fprintf (dump_file, "Pow2 counter "); if (hist->hvalue.counters) - { - fprintf (dump_file, "pow2:%" PRId64 - " nonpow2:%" PRId64, - (int64_t) hist->hvalue.counters[1], - (int64_t) hist->hvalue.counters[0]); - } - fprintf (dump_file, ".\n"); + fprintf (dump_file, "Pow2 counter pow2:%" PRId64 + " nonpow2:%" PRId64 ".\n", + (int64_t) hist->hvalue.counters[1], + (int64_t) hist->hvalue.counters[0]); break; case HIST_TYPE_SINGLE_VALUE: - fprintf (dump_file, "Single value "); + case HIST_TYPE_INDIR_CALL: if (hist->hvalue.counters) { - fprintf (dump_file, "value:%" PRId64 - " match:%" PRId64 - " wrong:%" PRId64, - (int64_t) hist->hvalue.counters[0], - (int64_t) hist->hvalue.counters[1], - (int64_t) hist->hvalue.counters[2]); + fprintf (dump_file, + (hist->type == HIST_TYPE_SINGLE_VALUE + ? "Single value counter " : "Indirect call counter")); + if (hist->hvalue.counters) + { + fprintf (dump_file, "all: %" PRId64 ", values: ", + (int64_t) hist->hvalue.counters[0]); + for (unsigned i = 0; i < GCOV_DISK_SINGLE_VALUES; i++) + { + fprintf (dump_file, "[%" PRId64 ":%" PRId64 "]", + (int64_t) hist->hvalue.counters[2 * i + 1], + (int64_t) hist->hvalue.counters[2 * i + 2]); + if (i != GCOV_DISK_SINGLE_VALUES - 1) + fprintf (dump_file, ", "); + } + fprintf (dump_file, ".\n"); + } } - fprintf (dump_file, ".\n"); break; case HIST_TYPE_AVERAGE: - fprintf (dump_file, "Average value "); if (hist->hvalue.counters) - { - fprintf (dump_file, "sum:%" PRId64 - " times:%" PRId64, - (int64_t) hist->hvalue.counters[0], - (int64_t) hist->hvalue.counters[1]); - } - fprintf (dump_file, ".\n"); + fprintf (dump_file, "Average value sum:%" PRId64 + " times:%" PRId64 ".\n", + (int64_t) hist->hvalue.counters[0], + (int64_t) hist->hvalue.counters[1]); break; case HIST_TYPE_IOR: - fprintf (dump_file, "IOR value "); if (hist->hvalue.counters) - { - fprintf (dump_file, "ior:%" PRId64, - (int64_t) hist->hvalue.counters[0]); - } - fprintf (dump_file, ".\n"); + fprintf (dump_file, "IOR value ior:%" PRId64 ".\n", + (int64_t) hist->hvalue.counters[0]); break; - case HIST_TYPE_INDIR_CALL: - fprintf (dump_file, "Indirect call "); - if (hist->hvalue.counters) - { - fprintf (dump_file, "value:%" PRId64 - " match:%" PRId64 - " all:%" PRId64, - (int64_t) hist->hvalue.counters[0], - (int64_t) hist->hvalue.counters[1], - (int64_t) hist->hvalue.counters[2]); - } - fprintf (dump_file, ".\n"); - break; case HIST_TYPE_TIME_PROFILE: - fprintf (dump_file, "Time profile "); if (hist->hvalue.counters) - { - fprintf (dump_file, "time:%" PRId64, - (int64_t) hist->hvalue.counters[0]); - } - fprintf (dump_file, ".\n"); - break; - case HIST_TYPE_INDIR_CALL_TOPN: - fprintf (dump_file, "Indirect call topn "); - if (hist->hvalue.counters) - { - int i; - - fprintf (dump_file, "accu:%" PRId64, hist->hvalue.counters[0]); - for (i = 1; i < (GCOV_ICALL_TOPN_VAL << 2); i += 2) - { - fprintf (dump_file, " target:%" PRId64 " value:%" PRId64, - (int64_t) hist->hvalue.counters[i], - (int64_t) hist->hvalue.counters[i+1]); - } - } - fprintf (dump_file, ".\n"); + fprintf (dump_file, "Time profile time:%" PRId64 ".\n", + (int64_t) hist->hvalue.counters[0]); break; case HIST_TYPE_MAX: gcc_unreachable (); @@ -363,7 +331,7 @@ stream_out_histogram_value (struct output_block *ob, histogram_value hist) /* When user uses an unsigned type with a big value, constant converted to gcov_type (a signed type) can be negative. */ gcov_type value = hist->hvalue.counters[i]; - if (hist->type == HIST_TYPE_SINGLE_VALUE && i == 0) + if (hist->type == HIST_TYPE_SINGLE_VALUE && i > 0) ; else gcc_assert (value >= 0); @@ -408,7 +376,7 @@ stream_in_histogram_value (struct lto_input_block *ib, gimple *stmt) case HIST_TYPE_SINGLE_VALUE: case HIST_TYPE_INDIR_CALL: - ncounters = 3; + ncounters = GCOV_SINGLE_VALUE_COUNTERS; break; case HIST_TYPE_IOR: @@ -416,10 +384,6 @@ stream_in_histogram_value (struct lto_input_block *ib, gimple *stmt) ncounters = 1; break; - case HIST_TYPE_INDIR_CALL_TOPN: - ncounters = (GCOV_ICALL_TOPN_VAL << 2) + 1; - break; - case HIST_TYPE_MAX: gcc_unreachable (); } @@ -749,6 +713,48 @@ gimple_divmod_fixed_value (gassign *stmt, tree value, profile_probability prob, return tmp2; } +/* Return most common value of SINGLE_VALUE histogram. If + there's a unique value, return true and set VALUE and COUNT + arguments. */ + +bool +get_most_common_single_value (gimple *stmt, const char *counter_type, + histogram_value hist, + gcov_type *value, gcov_type *count, + gcov_type *all) +{ + if (hist->hvalue.counters[2] == -1) + return false; + + *count = 0; + *value = 0; + + gcov_type read_all = hist->hvalue.counters[0]; + + for (unsigned i = 0; i < GCOV_DISK_SINGLE_VALUES; i++) + { + gcov_type v = hist->hvalue.counters[2 * i + 1]; + gcov_type c = hist->hvalue.counters[2 * i + 2]; + + /* Indirect calls can't be vereified. */ + if (stmt && check_counter (stmt, counter_type, &c, &read_all, + gimple_bb (stmt)->count)) + return false; + + *all = read_all; + + if (c > *count) + { + *value = v; + *count = c; + } + else if (c == *count && v > *value) + *value = v; + } + + return true; +} + /* Do transform 1) on INSN if applicable. */ static bool @@ -778,23 +784,19 @@ gimple_divmod_fixed_value_transform (gimple_stmt_iterator *si) if (!histogram) return false; + if (!get_most_common_single_value (stmt, "divmod", histogram, &val, &count, + &all)) + return false; + value = histogram->hvalue.value; - val = histogram->hvalue.counters[0]; - count = histogram->hvalue.counters[1]; - all = histogram->hvalue.counters[2]; gimple_remove_histogram_value (cfun, stmt, histogram); - /* We require that count is at least half of all; this means - that for the transformation to fire the value must be constant - at least 50% of time (and 75% gives the guarantee of usage). */ + /* We require that count is at least half of all. */ if (simple_cst_equal (gimple_assign_rhs2 (stmt), value) != 1 || 2 * count < all || optimize_bb_for_size_p (gimple_bb (stmt))) return false; - if (check_counter (stmt, "value", &count, &all, gimple_bb (stmt)->count)) - return false; - /* Compute probability of taking the optimal path. */ if (all > 0) prob = profile_probability::probability_in_gcov_type (count, all); @@ -1113,7 +1115,6 @@ gimple_mod_subtract_transform (gimple_stmt_iterator *si) count1 = histogram->hvalue.counters[0]; count2 = histogram->hvalue.counters[1]; - /* Compute probability of taking the optimal path. */ if (check_counter (stmt, "interval", &count1, &all, gimple_bb (stmt)->count)) { gimple_remove_histogram_value (cfun, stmt, histogram); @@ -1421,7 +1422,7 @@ gimple_ic_transform (gimple_stmt_iterator *gsi) { gcall *stmt; histogram_value histogram; - gcov_type val, count, all, bb_all; + gcov_type val, count, all; struct cgraph_node *direct_call; stmt = dyn_cast <gcall *> (gsi_stmt (*gsi)); @@ -1438,21 +1439,9 @@ gimple_ic_transform (gimple_stmt_iterator *gsi) if (!histogram) return false; - val = histogram->hvalue.counters [0]; - count = histogram->hvalue.counters [1]; - all = histogram->hvalue.counters [2]; - - bb_all = gimple_bb (stmt)->count.ipa ().to_gcov_type (); - /* The order of CHECK_COUNTER calls is important - - since check_counter can correct the third parameter - and we want to make count <= all <= bb_all. */ - if (check_counter (stmt, "ic", &all, &bb_all, gimple_bb (stmt)->count) - || check_counter (stmt, "ic", &count, &all, - profile_count::from_gcov_type (all))) - { - gimple_remove_histogram_value (cfun, stmt, histogram); - return false; - } + if (!get_most_common_single_value (NULL, "indirect call", histogram, &val, + &count, &all)) + return false; if (4 * count <= 3 * all) return false; @@ -1664,19 +1653,19 @@ gimple_stringops_transform (gimple_stmt_iterator *gsi) if (TREE_CODE (blck_size) == INTEGER_CST) return false; - histogram = gimple_histogram_value_of_type (cfun, stmt, HIST_TYPE_SINGLE_VALUE); + histogram = gimple_histogram_value_of_type (cfun, stmt, + HIST_TYPE_SINGLE_VALUE); if (!histogram) return false; - val = histogram->hvalue.counters[0]; - count = histogram->hvalue.counters[1]; - all = histogram->hvalue.counters[2]; + if (!get_most_common_single_value (stmt, "stringops", histogram, &val, + &count, &all)) + return false; + gimple_remove_histogram_value (cfun, stmt, histogram); - /* We require that count is at least half of all; this means - that for the transformation to fire the value must be constant - at least 80% of time. */ - if ((6 * count / 5) < all || optimize_bb_for_size_p (gimple_bb (stmt))) + /* We require that count is at least half of all. */ + if (2 * count < all || optimize_bb_for_size_p (gimple_bb (stmt))) return false; if (check_counter (stmt, "value", &count, &all, gimple_bb (stmt)->count)) return false; @@ -1865,12 +1854,8 @@ gimple_indirect_call_to_profile (gimple *stmt, histogram_values *values) values->reserve (3); - values->quick_push (gimple_alloc_histogram_value ( - cfun, - PARAM_VALUE (PARAM_INDIR_CALL_TOPN_PROFILE) ? - HIST_TYPE_INDIR_CALL_TOPN : - HIST_TYPE_INDIR_CALL, - stmt, callee)); + values->quick_push (gimple_alloc_histogram_value (cfun, HIST_TYPE_INDIR_CALL, + stmt, callee)); return; } @@ -1952,11 +1937,11 @@ gimple_find_values_to_profile (histogram_values *values) break; case HIST_TYPE_SINGLE_VALUE: - hist->n_counters = 3; + hist->n_counters = GCOV_SINGLE_VALUE_COUNTERS; break; - case HIST_TYPE_INDIR_CALL: - hist->n_counters = 3; + case HIST_TYPE_INDIR_CALL: + hist->n_counters = GCOV_SINGLE_VALUE_COUNTERS; break; case HIST_TYPE_TIME_PROFILE: @@ -1971,10 +1956,6 @@ gimple_find_values_to_profile (histogram_values *values) hist->n_counters = 1; break; - case HIST_TYPE_INDIR_CALL_TOPN: - hist->n_counters = GCOV_ICALL_TOPN_NCOUNTS; - break; - default: gcc_unreachable (); } diff --git a/gcc/value-prof.h b/gcc/value-prof.h index 1251fa95e31..25b03f7591a 100644 --- a/gcc/value-prof.h +++ b/gcc/value-prof.h @@ -33,8 +33,6 @@ enum hist_type HIST_TYPE_AVERAGE, /* Compute average value (sum of all values). */ HIST_TYPE_IOR, /* Used to compute expected alignment. */ HIST_TYPE_TIME_PROFILE, /* Used for time profile */ - HIST_TYPE_INDIR_CALL_TOPN, /* Tries to identify the top N most frequently - called functions in indirect call. */ HIST_TYPE_MAX }; @@ -92,6 +90,10 @@ void free_histograms (function *); void stringop_block_profile (gimple *, unsigned int *, HOST_WIDE_INT *); gcall *gimple_ic (gcall *, struct cgraph_node *, profile_probability); bool check_ic_target (gcall *, struct cgraph_node *); +bool get_most_common_single_value (gimple *stmt, const char *counter_type, + histogram_value hist, + gcov_type *value, gcov_type *count, + gcov_type *all); /* In tree-profile.c. */ diff --git a/libgcc/Makefile.in b/libgcc/Makefile.in index ea390a5bbea..33b83809cfc 100644 --- a/libgcc/Makefile.in +++ b/libgcc/Makefile.in @@ -888,20 +888,19 @@ include $(iterator) # Build libgcov components. LIBGCOV_MERGE = _gcov_merge_add _gcov_merge_single \ - _gcov_merge_ior _gcov_merge_time_profile _gcov_merge_icall_topn + _gcov_merge_ior _gcov_merge_time_profile LIBGCOV_PROFILER = _gcov_interval_profiler \ _gcov_interval_profiler_atomic \ _gcov_pow2_profiler \ _gcov_pow2_profiler_atomic \ - _gcov_one_value_profiler \ - _gcov_one_value_profiler_atomic \ + _gcov_one_value_profiler_v2 \ + _gcov_one_value_profiler_v2_atomic \ _gcov_average_profiler \ _gcov_average_profiler_atomic \ _gcov_ior_profiler \ _gcov_ior_profiler_atomic \ - _gcov_indirect_call_profiler_v3 \ - _gcov_time_profiler \ - _gcov_indirect_call_topn_profiler + _gcov_indirect_call_profiler_v4 \ + _gcov_time_profiler LIBGCOV_INTERFACE = _gcov_dump _gcov_flush _gcov_fork \ _gcov_execl _gcov_execlp \ _gcov_execle _gcov_execv _gcov_execvp _gcov_execve _gcov_reset diff --git a/libgcc/libgcov-driver.c b/libgcc/libgcov-driver.c index 5dc51df914f..f03868e34bb 100644 --- a/libgcc/libgcov-driver.c +++ b/libgcc/libgcov-driver.c @@ -415,84 +415,6 @@ merge_summary (int run_counted, struct gcov_summary *summary, } } -/* Sort N entries in VALUE_ARRAY in descending order. - Each entry in VALUE_ARRAY has two values. The sorting - is based on the second value. */ - -GCOV_LINKAGE void -gcov_sort_n_vals (gcov_type *value_array, int n) -{ - int j, k; - - for (j = 2; j < n; j += 2) - { - gcov_type cur_ent[2]; - - cur_ent[0] = value_array[j]; - cur_ent[1] = value_array[j + 1]; - k = j - 2; - while (k >= 0 && value_array[k + 1] < cur_ent[1]) - { - value_array[k + 2] = value_array[k]; - value_array[k + 3] = value_array[k+1]; - k -= 2; - } - value_array[k + 2] = cur_ent[0]; - value_array[k + 3] = cur_ent[1]; - } -} - -/* Sort the profile counters for all indirect call sites. Counters - for each call site are allocated in array COUNTERS. */ - -static void -gcov_sort_icall_topn_counter (const struct gcov_ctr_info *counters) -{ - int i; - gcov_type *values; - int n = counters->num; - - gcc_assert (!(n % GCOV_ICALL_TOPN_NCOUNTS)); - values = counters->values; - - for (i = 0; i < n; i += GCOV_ICALL_TOPN_NCOUNTS) - { - gcov_type *value_array = &values[i + 1]; - gcov_sort_n_vals (value_array, GCOV_ICALL_TOPN_NCOUNTS - 1); - } -} - -/* Sort topn indirect_call profile counters in GI_PTR. */ - -static void -gcov_sort_topn_counter_arrays (const struct gcov_info *gi_ptr) -{ - unsigned int i; - int f_ix; - const struct gcov_fn_info *gfi_ptr; - const struct gcov_ctr_info *ci_ptr; - - if (!gi_ptr->merge[GCOV_COUNTER_ICALL_TOPNV]) - return; - - for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions; f_ix++) - { - gfi_ptr = gi_ptr->functions[f_ix]; - ci_ptr = gfi_ptr->ctrs; - for (i = 0; i < GCOV_COUNTERS; i++) - { - if (!gi_ptr->merge[i]) - continue; - if (i == GCOV_COUNTER_ICALL_TOPNV) - { - gcov_sort_icall_topn_counter (ci_ptr); - break; - } - ci_ptr++; - } - } -} - /* Dump the coverage counts for one gcov_info object. We merge with existing counts when possible, to avoid growing the .da files ad infinitum. We use this program's checksum to make sure we only accumulate whole program @@ -510,8 +432,6 @@ dump_one_gcov (struct gcov_info *gi_ptr, struct gcov_filename *gf, fn_buffer = 0; - gcov_sort_topn_counter_arrays (gi_ptr); - error = gcov_exit_open_gcda_file (gi_ptr, gf); if (error == -1) return; diff --git a/libgcc/libgcov-merge.c b/libgcc/libgcov-merge.c index 046ed5718bb..f778cc4b6b7 100644 --- a/libgcc/libgcov-merge.c +++ b/libgcc/libgcov-merge.c @@ -35,7 +35,7 @@ void __gcov_merge_add (gcov_type *counters __attribute__ ((unused)), #ifdef L_gcov_merge_single void __gcov_merge_single (gcov_type *counters __attribute__ ((unused)), - unsigned n_counters __attribute__ ((unused))) {} + unsigned n_counters __attribute__ ((unused))) {} #endif #else @@ -85,103 +85,73 @@ __gcov_merge_time_profile (gcov_type *counters, unsigned n_counters) #endif /* L_gcov_merge_time_profile */ #ifdef L_gcov_merge_single + +static void +merge_single_value_set (gcov_type *counters) +{ + unsigned j; + gcov_type value, counter; + + /* First value is number of total executions of the profiler. */ + gcov_type all = gcov_get_counter_ignore_scaling (-1); + counters[0] += all; + ++counters; + + for (unsigned i = 0; i < GCOV_DISK_SINGLE_VALUES; i++) + { + value = gcov_get_counter_target (); + counter = gcov_get_counter_ignore_scaling (-1); + + if (counter == -1) + { + counters[1] = -1; + /* We can't return as we need to read all counters. */ + continue; + } + else if (counter == 0 || counters[1] == -1) + { + /* We can't return as we need to read all counters. */ + continue; + } + + for (j = 0; j < GCOV_DISK_SINGLE_VALUES; j++) + { + if (counters[2 * j] == value) + { + counters[2 * j + 1] += counter; + break; + } + else if (counters[2 * j + 1] == 0) + { + counters[2 * j] = value; + counters[2 * j + 1] = counter; + break; + } + } + + /* We haven't found a free slot for the value, mark overflow. */ + if (j == GCOV_DISK_SINGLE_VALUES) + counters[1] = -1; + } +} + /* The profile merging function for choosing the most common value. It is given an array COUNTERS of N_COUNTERS old counters and it reads the same number of counters from the gcov file. The counters - are split into 3-tuples where the members of the tuple have + are split into pairs where the members of the tuple have meanings: -- the stored candidate on the most common value of the measured entity -- counter - -- total number of evaluations of the value */ + */ void __gcov_merge_single (gcov_type *counters, unsigned n_counters) { - unsigned i, n_measures; - gcov_type value, counter, all; + gcc_assert (!(n_counters % GCOV_SINGLE_VALUE_COUNTERS)); - gcc_assert (!(n_counters % 3)); - n_measures = n_counters / 3; - for (i = 0; i < n_measures; i++, counters += 3) - { - value = gcov_get_counter_target (); - counter = gcov_get_counter (); - all = gcov_get_counter (); - - if (counters[0] == value) - counters[1] += counter; - else if (counter > counters[1]) - { - counters[0] = value; - counters[1] = counter - counters[1]; - } - else - counters[1] -= counter; - counters[2] += all; - } + for (unsigned i = 0; i < (n_counters / GCOV_SINGLE_VALUE_COUNTERS); i++) + merge_single_value_set (counters + (i * GCOV_SINGLE_VALUE_COUNTERS)); } #endif /* L_gcov_merge_single */ -#ifdef L_gcov_merge_icall_topn -/* The profile merging function used for merging indirect call counts - This function is given array COUNTERS of N_COUNTERS old counters and it - reads the same number of counters from the gcov file. */ - -void -__gcov_merge_icall_topn (gcov_type *counters, unsigned n_counters) -{ - unsigned i, j, k, m; - - gcc_assert (!(n_counters % GCOV_ICALL_TOPN_NCOUNTS)); - for (i = 0; i < n_counters; i += GCOV_ICALL_TOPN_NCOUNTS) - { - gcov_type *value_array = &counters[i + 1]; - unsigned tmp_size = 2 * (GCOV_ICALL_TOPN_NCOUNTS - 1); - gcov_type *tmp_array - = (gcov_type *) alloca (tmp_size * sizeof (gcov_type)); - - for (j = 0; j < tmp_size; j++) - tmp_array[j] = 0; - - for (j = 0; j < GCOV_ICALL_TOPN_NCOUNTS - 1; j += 2) - { - tmp_array[j] = value_array[j]; - tmp_array[j + 1] = value_array [j + 1]; - } - - /* Skip the number_of_eviction entry. */ - gcov_get_counter (); - for (k = 0; k < GCOV_ICALL_TOPN_NCOUNTS - 1; k += 2) - { - int found = 0; - gcov_type global_id = gcov_get_counter_target (); - gcov_type call_count = gcov_get_counter (); - for (m = 0; m < j; m += 2) - { - if (tmp_array[m] == global_id) - { - found = 1; - tmp_array[m + 1] += call_count; - break; - } - } - if (!found) - { - tmp_array[j] = global_id; - tmp_array[j + 1] = call_count; - j += 2; - } - } - /* Now sort the temp array */ - gcov_sort_n_vals (tmp_array, j); - - /* Now copy back the top half of the temp array */ - for (k = 0; k < GCOV_ICALL_TOPN_NCOUNTS - 1; k += 2) - { - value_array[k] = tmp_array[k]; - value_array[k + 1] = tmp_array[k + 1]; - } - } -} -#endif /* L_gcov_merge_icall_topn */ #endif /* inhibit_libc */ diff --git a/libgcc/libgcov-profiler.c b/libgcc/libgcov-profiler.c index 7116330252b..9ba65b90df3 100644 --- a/libgcc/libgcov-profiler.c +++ b/libgcc/libgcov-profiler.c @@ -112,40 +112,37 @@ __gcov_pow2_profiler_atomic (gcov_type *counters, gcov_type value) COUNTERS[1] is decremented. Otherwise COUNTERS[1] is set to one and VALUE is stored to COUNTERS[0]. This algorithm guarantees that if this function is called more than 50% of the time with one value, this value - will be in COUNTERS[0] in the end. - - In any case, COUNTERS[2] is incremented. If USE_ATOMIC is set to 1, - COUNTERS[2] is updated with an atomic instruction. */ + will be in COUNTERS[0] in the end. */ static inline void __gcov_one_value_profiler_body (gcov_type *counters, gcov_type value, int use_atomic) { - if (value == counters[0]) - counters[1]++; - else if (counters[1] == 0) + if (value == counters[1]) + counters[2]++; + else if (counters[2] == 0) { - counters[1] = 1; - counters[0] = value; + counters[2] = 1; + counters[1] = value; } else - counters[1]--; + counters[2]--; if (use_atomic) - __atomic_fetch_add (&counters[2], 1, __ATOMIC_RELAXED); + __atomic_fetch_add (&counters[0], 1, __ATOMIC_RELAXED); else - counters[2]++; + counters[0]++; } -#ifdef L_gcov_one_value_profiler +#ifdef L_gcov_one_value_profiler_v2 void -__gcov_one_value_profiler (gcov_type *counters, gcov_type value) +__gcov_one_value_profiler_v2 (gcov_type *counters, gcov_type value) { __gcov_one_value_profiler_body (counters, value, 0); } #endif -#if defined(L_gcov_one_value_profiler_atomic) && GCOV_SUPPORTS_ATOMIC +#if defined(L_gcov_one_value_profiler_v2_atomic) && GCOV_SUPPORTS_ATOMIC /* Update one value profilers (COUNTERS) for a given VALUE. @@ -157,146 +154,13 @@ __gcov_one_value_profiler (gcov_type *counters, gcov_type value) https://gcc.gnu.org/ml/gcc-patches/2016-08/msg00024.html. */ void -__gcov_one_value_profiler_atomic (gcov_type *counters, gcov_type value) +__gcov_one_value_profiler_v2_atomic (gcov_type *counters, gcov_type value) { __gcov_one_value_profiler_body (counters, value, 1); } #endif -#ifdef L_gcov_indirect_call_topn_profiler -/* Tries to keep track the most frequent N values in the counters where - N is specified by parameter TOPN_VAL. To track top N values, 2*N counter - entries are used. - counter[0] --- the accumative count of the number of times one entry in - in the counters gets evicted/replaced due to limited capacity. - When this value reaches a threshold, the bottom N values are - cleared. - counter[1] through counter[2*N] records the top 2*N values collected so far. - Each value is represented by two entries: count[2*i+1] is the ith value, and - count[2*i+2] is the number of times the value is seen. */ - -static void -__gcov_topn_value_profiler_body (gcov_type *counters, gcov_type value) -{ - unsigned i, found = 0, have_zero_count = 0; - gcov_type *entry; - gcov_type *lfu_entry = &counters[1]; - gcov_type *value_array = &counters[1]; - gcov_type *num_eviction = &counters[0]; - gcov_unsigned_t topn_val = GCOV_ICALL_TOPN_VAL; - - /* There are 2*topn_val values tracked, each value takes two slots in the - counter array. */ - for (i = 0; i < (topn_val << 2); i += 2) - { - entry = &value_array[i]; - if (entry[0] == value) - { - entry[1]++ ; - found = 1; - break; - } - else if (entry[1] == 0) - { - lfu_entry = entry; - have_zero_count = 1; - } - else if (entry[1] < lfu_entry[1]) - lfu_entry = entry; - } - - if (found) - return; - - /* lfu_entry is either an empty entry or an entry - with lowest count, which will be evicted. */ - lfu_entry[0] = value; - lfu_entry[1] = 1; - -#define GCOV_ICALL_COUNTER_CLEAR_THRESHOLD 3000 - - /* Too many evictions -- time to clear bottom entries to - avoid hot values bumping each other out. */ - if (!have_zero_count - && ++*num_eviction >= GCOV_ICALL_COUNTER_CLEAR_THRESHOLD) - { - unsigned i, j; - gcov_type *p, minv; - gcov_type* tmp_cnts - = (gcov_type *)alloca (topn_val * sizeof (gcov_type)); - - *num_eviction = 0; - - for (i = 0; i < topn_val; i++) - tmp_cnts[i] = 0; - - /* Find the largest topn_val values from the group of - 2*topn_val values and put them into tmp_cnts. */ - - for (i = 0; i < 2 * topn_val; i += 2) - { - p = 0; - for (j = 0; j < topn_val; j++) - { - if (!p || tmp_cnts[j] < *p) - p = &tmp_cnts[j]; - } - if (value_array[i + 1] > *p) - *p = value_array[i + 1]; - } - - minv = tmp_cnts[0]; - for (j = 1; j < topn_val; j++) - { - if (tmp_cnts[j] < minv) - minv = tmp_cnts[j]; - } - /* Zero out low value entries. */ - for (i = 0; i < 2 * topn_val; i += 2) - { - if (value_array[i + 1] < minv) - { - value_array[i] = 0; - value_array[i + 1] = 0; - } - } - } -} - -/* These two variables are used to actually track caller and callee. Keep - them in TLS memory so races are not common (they are written to often). - The variables are set directly by GCC instrumented code, so declaration - here must match one in tree-profile.c. */ - -#if defined(HAVE_CC_TLS) && !defined (USE_EMUTLS) -__thread -#endif -struct indirect_call_tuple __gcov_indirect_call_topn; - -#ifdef TARGET_VTABLE_USES_DESCRIPTORS -#define VTABLE_USES_DESCRIPTORS 1 -#else -#define VTABLE_USES_DESCRIPTORS 0 -#endif - -/* This fucntion is instrumented at function entry to track topn indirect - calls to CUR_FUNC. */ - -void -__gcov_indirect_call_topn_profiler (gcov_type value, void* cur_func) -{ - void *callee_func = __gcov_indirect_call_topn.callee; - /* If the C++ virtual tables contain function descriptors then one - function may have multiple descriptors and we need to dereference - the descriptors to see if they point to the same function. */ - if (cur_func == callee_func - || (VTABLE_USES_DESCRIPTORS && callee_func - && *(void **) cur_func == *(void **) callee_func)) - __gcov_topn_value_profiler_body (__gcov_indirect_call_topn.counters, value); -} -#endif - -#ifdef L_gcov_indirect_call_profiler_v3 +#ifdef L_gcov_indirect_call_profiler_v4 /* These two variables are used to actually track caller and callee. Keep them in TLS memory so races are not common (they are written to often). @@ -318,7 +182,7 @@ struct indirect_call_tuple __gcov_indirect_call; /* Tries to determine the most common value among its inputs. */ void -__gcov_indirect_call_profiler_v3 (gcov_type value, void* cur_func) +__gcov_indirect_call_profiler_v4 (gcov_type value, void* cur_func) { /* If the C++ virtual tables contain function descriptors then one function may have multiple descriptors and we need to dereference diff --git a/libgcc/libgcov-util.c b/libgcc/libgcov-util.c index ae0dd017204..45d46f2219e 100644 --- a/libgcc/libgcov-util.c +++ b/libgcc/libgcov-util.c @@ -740,25 +740,6 @@ __gcov_single_counter_op (gcov_type *counters, unsigned n_counters, } } -/* Performing FN upon indirect-call profile counters. */ - -static void -__gcov_icall_topn_counter_op (gcov_type *counters, unsigned n_counters, - counter_op_fn fn, void *data1, void *data2) -{ - unsigned i; - - gcc_assert (!(n_counters % GCOV_ICALL_TOPN_NCOUNTS)); - for (i = 0; i < n_counters; i += GCOV_ICALL_TOPN_NCOUNTS) - { - unsigned j; - gcov_type *value_array = &counters[i + 1]; - - for (j = 0; j < GCOV_ICALL_TOPN_NCOUNTS - 1; j += 2) - value_array[j + 1] = fn (value_array[j + 1], data1, data2); - } -} - /* Scaling the counter value V by multiplying *(float*) DATA1. */ static gcov_type diff --git a/libgcc/libgcov.h b/libgcc/libgcov.h index 993db8fb057..7f316146d49 100644 --- a/libgcc/libgcov.h +++ b/libgcc/libgcov.h @@ -102,7 +102,6 @@ typedef unsigned gcov_type_unsigned __attribute__ ((mode (QI))); #define gcov_read_unsigned __gcov_read_unsigned #define gcov_read_counter __gcov_read_counter #define gcov_read_summary __gcov_read_summary -#define gcov_sort_n_vals __gcov_sort_n_vals #else /* IN_GCOV_TOOL */ /* About the host. */ @@ -130,7 +129,6 @@ typedef unsigned gcov_position_t; #define L_gcov_merge_single 1 #define L_gcov_merge_ior 1 #define L_gcov_merge_time_profile 1 -#define L_gcov_merge_icall_topn 1 extern gcov_type gcov_read_counter_mem (); extern unsigned gcov_get_merge_weight (); @@ -267,26 +265,21 @@ extern void __gcov_merge_single (gcov_type *, unsigned) ATTRIBUTE_HIDDEN; /* The merge function that just ors the counters together. */ extern void __gcov_merge_ior (gcov_type *, unsigned) ATTRIBUTE_HIDDEN; -/* The merge function is used for topn indirect call counters. */ -extern void __gcov_merge_icall_topn (gcov_type *, unsigned) ATTRIBUTE_HIDDEN; - /* The profiler functions. */ extern void __gcov_interval_profiler (gcov_type *, gcov_type, int, unsigned); extern void __gcov_interval_profiler_atomic (gcov_type *, gcov_type, int, unsigned); extern void __gcov_pow2_profiler (gcov_type *, gcov_type); extern void __gcov_pow2_profiler_atomic (gcov_type *, gcov_type); -extern void __gcov_one_value_profiler (gcov_type *, gcov_type); -extern void __gcov_one_value_profiler_atomic (gcov_type *, gcov_type); -extern void __gcov_indirect_call_profiler_v3 (gcov_type, void *); +extern void __gcov_one_value_profiler_v2 (gcov_type *, gcov_type); +extern void __gcov_one_value_profiler_v2_atomic (gcov_type *, gcov_type); +extern void __gcov_indirect_call_profiler_v4 (gcov_type, void *); extern void __gcov_time_profiler (gcov_type *); extern void __gcov_time_profiler_atomic (gcov_type *); extern void __gcov_average_profiler (gcov_type *, gcov_type); extern void __gcov_average_profiler_atomic (gcov_type *, gcov_type); extern void __gcov_ior_profiler (gcov_type *, gcov_type); extern void __gcov_ior_profiler_atomic (gcov_type *, gcov_type); -extern void __gcov_indirect_call_topn_profiler (gcov_type, void *); -extern void gcov_sort_n_vals (gcov_type *, int); #ifndef inhibit_libc /* The wrappers around some library functions.. */ @@ -331,6 +324,29 @@ gcov_get_counter (void) #endif } +/* Similar function as gcov_get_counter(), but do not scale + when read value is equal to IGNORE_SCALING. */ + +static inline gcov_type +gcov_get_counter_ignore_scaling (gcov_type ignore_scaling ATTRIBUTE_UNUSED) +{ +#ifndef IN_GCOV_TOOL + /* This version is for reading count values in libgcov runtime: + we read from gcda files. */ + + return gcov_read_counter (); +#else + /* This version is for gcov-tool. We read the value from memory and + multiply it by the merge weight. */ + + gcov_type v = gcov_read_counter_mem (); + if (v != ignore_scaling) + v *= gcov_get_merge_weight (); + + return v; +#endif +} + /* Similar function as gcov_get_counter(), but handles target address counters. */
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