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Fastest true incarnation so far. Not much faster than unordered_map.

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Davi Reis 2012-04-21 21:48:32 +02:00
parent c52152bcb4
commit 6afc7cf105
3 changed files with 27 additions and 15 deletions
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7
cxxmph/bm_map.cc
View File

@ -41,11 +41,12 @@ class BM_SearchUrls : public SearchUrlsBenchmark {
: SearchUrlsBenchmark(urls_file, nsearches, miss_ratio) { }
virtual ~BM_SearchUrls() {}
virtual void Run() {
uint32_t total = 1;
for (auto it = random_.begin(); it != random_.end(); ++it) {
myfind(mymap_, *it);
assert(it->ends_with(".force_miss") ^ v != NULL);
assert(!v || *v == *it);
auto v = myfind(mymap_, *it);
if (v) total += v->length();
}
fprintf(stderr, "Total: %u\n", total);
}
protected:
virtual bool SetUp() {

14
cxxmph/mph_index.h
View File

@ -124,7 +124,7 @@ bool MPHIndex::Reset(
if ((r_ % 2) == 0) r_ += 1;
// This can be used to speed mods, but increases occupation too much.
// Needs to try http://gmplib.org/manual/Integer-Exponentiation.html instead
// r_ = nextpoweroftwo(r_);
r_ = nextpoweroftwo(r_);
nest_displacement_[0] = 0;
nest_displacement_[1] = r_;
nest_displacement_[2] = (r_ << 1);
@ -177,12 +177,12 @@ template <class SeededHashFcn, class Key>
uint32_t MPHIndex::perfect_hash(const Key& key) const {
if (!g_.size()) return 0;
h128 h = SeededHashFcn().hash128(key, hash_seed_[0]);
h[0] = (h[0] % r_) + nest_displacement_[0];
h[1] = (h[1] % r_) + nest_displacement_[1];
h[2] = (h[2] % r_) + nest_displacement_[2];
// h[0] = (h[0] & (r_-1)) + nest_displacement_[0];
// h[1] = (h[1] & (r_-1)) + nest_displacement_[1];
// h[2] = (h[2] & (r_-1)) + nest_displacement_[2];
// h[0] = (h[0] % r_) + nest_displacement_[0];
// h[1] = (h[1] % r_) + nest_displacement_[1];
// h[2] = (h[2] % r_) + nest_displacement_[2];
h[0] = (h[0] & (r_-1)) + nest_displacement_[0];
h[1] = (h[1] & (r_-1)) + nest_displacement_[1];
h[2] = (h[2] & (r_-1)) + nest_displacement_[2];
assert((h[0]) < g_.size());
assert((h[1]) < g_.size());
assert((h[2]) < g_.size());

21
cxxmph/mph_map.h
View File

@ -79,6 +79,7 @@ class mph_map {
inline const_iterator find(const key_type& k) const;
typedef int32_t my_int32_t; // help macros
inline int32_t index(const key_type& k) const;
inline int32_t index2(const key_type& k) const;
data_type& operator[](const key_type &k);
const data_type& operator[](const key_type &k) const;
@ -197,7 +198,7 @@ MPH_MAP_METHOD_DECL(void_type, erase)(const key_type& k) {
}
MPH_MAP_INLINE_METHOD_DECL(const_iterator, find)(const key_type& k) const {
auto idx = index(k);
auto idx = index2(k);
typename vector<value_type>::const_iterator vit = values_.begin() + idx;
if (idx == -1 || vit->first != k) return end();
return make_solid(&values_, &present_, vit);;
@ -210,17 +211,27 @@ MPH_MAP_INLINE_METHOD_DECL(iterator, find)(const key_type& k) {
return make_solid(&values_, &present_, vit);;
}
MPH_MAP_INLINE_METHOD_DECL(my_int32_t, index)(const key_type& k) const {
if (__builtin_expect(!slack_.empty(), 0)) {
auto sit = slack_.find(hasher128_.hash128(k, 0));
if (sit != slack_.end()) return sit->second;
MPH_MAP_INLINE_METHOD_DECL(my_int32_t, index2)(const key_type& k) const {
if (__builtin_expect(index_.perfect_hash_size(), 1)) {
auto perfect_hash = index_.perfect_hash(k);
return perfect_hash;
}
return -1;
}
MPH_MAP_INLINE_METHOD_DECL(my_int32_t, index)(const key_type& k) const {
if (__builtin_expect(index_.perfect_hash_size(), 1)) {
auto perfect_hash = index_.perfect_hash(k);
if (__builtin_expect(present_[perfect_hash], true)) {
return perfect_hash;
}
}
if (__builtin_expect(!slack_.empty(), 0)) {
auto sit = slack_.find(hasher128_.hash128(k, 0));
if (sit != slack_.end()) return sit->second;
}
return -1;
}