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Improve ptr_map_hash_key

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gingerBill
2021-11-05 17:55:09 +00:00
parent 7be18b4a80
commit 899cc71990
1 changed files with 27 additions and 9 deletions
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36
src/ptr_map.cpp
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@@ -14,10 +14,9 @@ template <typename K, typename V>
struct PtrMapEntry {
static_assert(sizeof(K) == sizeof(void *), "Key size must be pointer size");
u32 hash;
MapIndex next;
K key;
V value;
MapIndex next;
};
template <typename K, typename V>
@@ -27,14 +26,33 @@ struct PtrMap {
};
u32 ptr_map_hash_key(void const *key) {
// TODO(bill): Improve ptr_map_hash_key
return fnv32a(&key, gb_size_of(key));
}
u32 ptr_map_hash_key(uintptr key) {
#if defined(GB_ARCH_64_BIT)
// TODO(bill): Improve ptr_map_hash_key
return fnv32a(&key, gb_size_of(key));
u32 key0 = (u32)(key & 0xffffffff);
u32 key1 = (u32)(key >> 32);
u32 word;
u32 state = 0;
state += key0 * 747796405u + 2891336453u;
word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;
state = (word >> 22u) ^ word;
state += key1 * 747796405u + 2891336453u;
word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;
state = (word >> 22u) ^ word;
return state;
#elif defined(GB_ARCH_32_BIT)
u32 state = ((u32)key) * 747796405u + 2891336453u;
u32 word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;
return (word >> 22u) ^ word;
#endif
}
u32 ptr_map_hash_key(void const *key) {
return ptr_map_hash_key((uintptr)key);
}
template <typename K, typename V> void map_init (PtrMap<K, V> *h, gbAllocator a, isize capacity = 16);
template <typename K, typename V> void map_destroy (PtrMap<K, V> *h);
@@ -77,7 +95,6 @@ gb_inline void map_destroy(PtrMap<K, V> *h) {
template <typename K, typename V>
gb_internal MapIndex map__add_entry(PtrMap<K, V> *h, K key) {
PtrMapEntry<K, V> e = {};
e.hash = ptr_map_hash_key(key);
e.key = key;
e.next = MAP_SENTINEL;
array_add(&h->entries, e);
@@ -109,7 +126,8 @@ gb_internal MapFindResult map__find_from_entry(PtrMap<K, V> *h, PtrMapEntry<K, V
if (h->hashes.count == 0) {
return fr;
}
fr.hash_index = cast(MapIndex)(e->hash & (h->hashes.count-1));
u32 hash = ptr_map_hash_key(e->key);
fr.hash_index = cast(MapIndex)(hash & (h->hashes.count-1));
fr.entry_index = h->hashes.data[fr.hash_index];
while (fr.entry_index != MAP_SENTINEL) {
if (&h->entries.data[fr.entry_index] == e) {