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mcclellan compile: more efficient discovery of accel

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Alex Coyte 2016-04-14 12:30:46 +10:00 committed by Matthew Barr
parent d7774f3d69
commit 9fa11b48b0
1 changed files with 41 additions and 32 deletions
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73
src/nfa/mcclellancompile_accel.cpp
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@ -272,8 +272,6 @@ map<dstate_id_t, AccelScheme> populateAccelerationInfo(const raw_dfa &rdfa,
DEBUG_PRINTF("sds %hu\n", sds_proxy);
for (size_t i = 0; i < rdfa.states.size(); i++) {
AccelScheme ei = strat.find_escape_strings(i);
if (i == DEAD_STATE) {
continue;
}
@ -281,8 +279,7 @@ map<dstate_id_t, AccelScheme> populateAccelerationInfo(const raw_dfa &rdfa,
/* Note on report acceleration states: While we can't accelerate while we
* are spamming out callbacks, the QR code paths don't raise reports
* during scanning so they can accelerate report states. */
if (generates_callbacks(rdfa.kind)
&& !rdfa.states[i].reports.empty()) {
if (generates_callbacks(rdfa.kind) && !rdfa.states[i].reports.empty()) {
continue;
}
@ -290,6 +287,7 @@ map<dstate_id_t, AccelScheme> populateAccelerationInfo(const raw_dfa &rdfa,
: ACCEL_DFA_MAX_STOP_CHAR;
DEBUG_PRINTF("inspecting %zu/%hu: %zu\n", i, sds_proxy, single_limit);
AccelScheme ei = strat.find_escape_strings(i);
if (ei.cr.count() > single_limit) {
DEBUG_PRINTF("state %zu is not accelerable has %zu\n", i,
ei.cr.count());
@ -335,6 +333,7 @@ AccelScheme find_mcclellan_escape_info(const raw_dfa &rdfa, dstate_id_t this_idx
const dstate &raw = rdfa.states[this_idx];
const vector<CharReach> rev_map = reverse_alpha_remapping(rdfa);
bool outs2_broken = false;
map<dstate_id_t, CharReach> succs;
for (u32 i = 0; i < rev_map.size(); i++) {
if (raw.next[i] == this_idx) {
@ -344,39 +343,49 @@ AccelScheme find_mcclellan_escape_info(const raw_dfa &rdfa, dstate_id_t this_idx
const CharReach &cr_i = rev_map.at(i);
rv.cr |= cr_i;
dstate_id_t next_id = raw.next[i];
DEBUG_PRINTF("next is %hu\n", raw.next[i]);
const dstate &raw_next = rdfa.states[raw.next[i]];
if (!raw_next.reports.empty() && generates_callbacks(rdfa.kind)) {
DEBUG_PRINTF("leads to report\n");
outs2_broken = true; /* cannot accelerate over reports */
}
DEBUG_PRINTF("next is %hu\n", next_id);
const dstate &raw_next = rdfa.states[next_id];
if (outs2_broken) {
continue;
}
CharReach cr_all_j;
for (u32 j = 0; j < rev_map.size(); j++) {
if (raw_next.next[j] == raw.next[j]) {
continue;
if (!raw_next.reports.empty() && generates_callbacks(rdfa.kind)) {
DEBUG_PRINTF("leads to report\n");
outs2_broken = true; /* cannot accelerate over reports */
continue;
}
succs[next_id] |= cr_i;
}
if (!outs2_broken) {
for (const auto &e : succs) {
const CharReach &cr_i = e.second;
const dstate &raw_next = rdfa.states[e.first];
CharReach cr_all_j;
for (u32 j = 0; j < rev_map.size(); j++) {
if (raw_next.next[j] == raw.next[j]) {
continue;
}
DEBUG_PRINTF("state %hu: adding sym %u -> %hu to 2 \n", e.first,
j, raw_next.next[j]);
cr_all_j |= rev_map.at(j);
}
DEBUG_PRINTF("adding sym %u sym %u -> %hu to 2 \n", i, j,
raw_next.next[j]);
cr_all_j |= rev_map.at(j);
}
if (cr_i.count() * cr_all_j.count() > 8) {
DEBUG_PRINTF("adding sym %u to double_cr\n", i);
rv.double_cr |= cr_i;
} else {
for (auto ii = cr_i.find_first(); ii != CharReach::npos;
ii = cr_i.find_next(ii)) {
for (auto jj = cr_all_j.find_first(); jj != CharReach::npos;
jj = cr_all_j.find_next(jj)) {
rv.double_byte.emplace((u8)ii, (u8)jj);
if (cr_i.count() * cr_all_j.count() > 8) {
DEBUG_PRINTF("adding %zu to double_cr\n", cr_i.count());
rv.double_cr |= cr_i;
} else {
for (auto ii = cr_i.find_first(); ii != CharReach::npos;
ii = cr_i.find_next(ii)) {
for (auto jj = cr_all_j.find_first(); jj != CharReach::npos;
jj = cr_all_j.find_next(jj)) {
rv.double_byte.emplace((u8)ii, (u8)jj);
}
}
}
}
@ -385,10 +394,10 @@ AccelScheme find_mcclellan_escape_info(const raw_dfa &rdfa, dstate_id_t this_idx
DEBUG_PRINTF("outs2 too big\n");
outs2_broken = true;
}
}
if (outs2_broken) {
rv.double_byte.clear();
if (outs2_broken) {
rv.double_byte.clear();
}
}
DEBUG_PRINTF("this %u, sds proxy %hu\n", this_idx, get_sds_or_proxy(rdfa));