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More hashtable finetuning

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This commit is contained in:
Clifford Wolf 2014-12-27 03:04:50 +01:00
parent 88d08e8f24
commit 66ab88d7b0
9 changed files with 40 additions and 18 deletions
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31
kernel/hashmap.h
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@ -23,6 +23,8 @@
#include <string>
#include <vector>
#define YOSYS_HASHTABLE_SIZE_FACTOR 3
inline unsigned int mkhash(unsigned int a, unsigned int b) {
return ((a << 5) + a) ^ b;
}
@ -81,8 +83,19 @@ struct hash_ptr_ops {
}
};
struct hash_obj_ops {
bool cmp(const void *a, const void *b) const {
return a == b;
}
template<typename T>
unsigned int hash(const T *a) const {
return a->name.hash();
}
};
inline int hashtable_size(int old_size)
{
// prime numbers, approx. in powers of two
if (old_size < 53) return 53;
if (old_size < 113) return 113;
if (old_size < 251) return 251;
@ -144,7 +157,9 @@ class dict
entries.clear();
counter = other.size();
int new_size = hashtable_size(counter);
int new_size = hashtable_size(YOSYS_HASHTABLE_SIZE_FACTOR * counter);
hashtable.resize(new_size);
new_size = new_size / YOSYS_HASHTABLE_SIZE_FACTOR + 1;
entries.reserve(new_size);
for (auto &it : other)
@ -165,7 +180,6 @@ class dict
{
free_list = -1;
hashtable.resize(entries.size());
for (auto &h : hashtable)
h = -1;
@ -221,7 +235,9 @@ class dict
if (free_list < 0)
{
int i = entries.size();
entries.resize(hashtable_size(i));
int new_size = hashtable_size(YOSYS_HASHTABLE_SIZE_FACTOR * entries.size());
hashtable.resize(new_size);
entries.resize(new_size / YOSYS_HASHTABLE_SIZE_FACTOR + 1);
entries[i].udata = value;
entries[i].set_next_used(0);
counter++;
@ -473,7 +489,9 @@ class pool
entries.clear();
counter = other.size();
int new_size = hashtable_size(counter);
int new_size = hashtable_size(YOSYS_HASHTABLE_SIZE_FACTOR * counter);
hashtable.resize(new_size);
new_size = new_size / YOSYS_HASHTABLE_SIZE_FACTOR + 1;
entries.reserve(new_size);
for (auto &it : other)
@ -494,7 +512,6 @@ class pool
{
free_list = -1;
hashtable.resize(entries.size());
for (auto &h : hashtable)
h = -1;
@ -550,7 +567,9 @@ class pool
if (free_list < 0)
{
int i = entries.size();
entries.resize(hashtable_size(i));
int new_size = hashtable_size(YOSYS_HASHTABLE_SIZE_FACTOR * entries.size());
hashtable.resize(new_size);
entries.resize(new_size / YOSYS_HASHTABLE_SIZE_FACTOR + 1);
entries[i].key = key;
entries[i].set_next_used(0);
counter++;