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Somewhat smaller SymEntry. Different mixing function in stables.

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This commit is contained in:
Christoffer Lerno
2022-01-10 22:05:56 +01:00
parent 71623a1874
commit a6b29bccb7
1 changed files with 7 additions and 4 deletions
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11
src/compiler/symtab.c
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@@ -9,8 +9,8 @@
typedef struct _SymEntry typedef struct _SymEntry
{ {
const char *value; const char *value;
TokenType type; uint16_t key_len;
uint32_t key_len; TokenType type : 16;
uint32_t hash; uint32_t hash;
} SymEntry; } SymEntry;
@@ -284,12 +284,15 @@ void stable_clear(STable *table)
static inline SEntry *sentry_find(SEntry *entries, uint32_t capacity, const char *key) static inline SEntry *sentry_find(SEntry *entries, uint32_t capacity, const char *key)
{ {
uint32_t index = (uint32_t)((((uintptr_t)key) >> 2u) & (capacity - 1)); uintptr_t hash_key = (uintptr_t)key;
uint32_t mask = capacity - 1;
hash_key ^= hash_key >> 16;
uint32_t index = (uint32_t)hash_key & mask;
while (1) while (1)
{ {
SEntry *entry = &entries[index]; SEntry *entry = &entries[index];
if (entry->key == key || !entry->key) return entry; if (entry->key == key || !entry->key) return entry;
index = (index + 1) & (capacity - 1); index = (index + 1) & mask;
} }
} }