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Alessandro Mauri 2023-03-12 01:59:50 +01:00
parent 09fe22e984
commit 8c1f4f5ee2
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3 changed files with 16 additions and 10 deletions
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18
text_rendering/generic_cache.h
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@ -14,16 +14,22 @@
// FIXME: this cache implementation is not really generic since it expects an unsigned
// as the code and not a generic type
// FIXME: when resetting the bitmap all references to overwritten elements are
// invalidated, this really means that
// 1) we get data mismatches
// 2) this is not a good LRU cache
#define CACHE_SET(c, x) \
{ \
c->cycles = (c->cycles+1)%CACHE_NCYCLES; \
if (!c->cycles) CACHE_BRESET(c->bitmap); \
if (++(c->cycles) > CACHE_NCYCLES) { \
CACHE_BRESET(c->bitmap); \
c->cycles=0;} \
CACHE_BSET(c->bitmap, x); \
}
#define CACHE_DECL(name, type, hashfn, cmpfn) \
HASH_DECL(name##table, uint32_t, void *, hashfn, cmpfn) \
HASH_DECL(name##table, uint32_t, uint32_t, hashfn, cmpfn) \
struct name { \
struct name##table_ref *table; \
type *array; \
@ -61,8 +67,8 @@ const type * name##_search(struct name *cache, uint32_t code) \
if (!r || !cmpfn(code, r->code)) \
return NULL; \
/* HIT, set as recently used */ \
CACHE_SET(cache, (type *)(r->data)-(cache->array)); \
return (const type *)(r->data); \
CACHE_SET(cache, r->data); \
return (&cache->array[r->data]); \
} \
\
\
@ -92,7 +98,7 @@ const type * name##_insert(struct name *cache, const type *g, uint32_t code, int
CACHE_SET(cache, x) \
spot = &(cache->array[x]); \
*spot = *g; \
struct name##table_entry e = { .code = code, .data = spot}; \
struct name##table_entry e = { .code = code, .data = x}; \
if (!name##table_insert(cache->table, &e)) \
return NULL; \
return spot; \