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made cache a generic structure

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Alessandro Mauri 2023-03-05 10:41:40 +01:00
parent 93f93a594e
commit 56a4357b20
6 changed files with 120 additions and 152 deletions
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100
text_rendering/generic_cache.h Normal file
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#ifndef CACHE_GENERIC_H
#define CACHE_GENERIC_H
#include "hash.h"
#define CACHE_SIZE 512
#define CACHE_NCYCLES (CACHE_SIZE/2)
#define CACHE_BSIZE (((CACHE_SIZE+0x3f)&(~0x3f))>>6)
#define CACHE_BRESET(b) for (int i = 0; i < CACHE_BSIZE; b[i++] = 0);
#define CACHE_BSET(b, x) b[(x)>>6] |= (uint64_t)1<<((x)%64)
#define CACHE_BTEST(b, x) (b[(x)>>6]&((uint64_t)1<<((x)%64)))
#define CACHE_SET(c, x) \
{ \
c->cycles = (c->cycles+1)%CACHE_NCYCLES; \
if (!c->cycles) CACHE_BRESET(c->bitmap); \
CACHE_BSET(c->bitmap, x); \
}
#define CACHE_DECL(cachename, type) \
struct cachename { \
struct hm_ref *table; \
type *array; \
uint64_t *bitmap; \
int cycles; \
}; \
\
\
struct cachename cachename##_init(void) \
{ \
struct hm_ref *t = hm_create(CACHE_SIZE); \
type *a = malloc(sizeof(type)*CACHE_SIZE); \
uint64_t *b = malloc(sizeof(uint64_t)*CACHE_BSIZE); \
CACHE_BRESET(b); \
return (struct cachename){ .table = t, .array = a, .bitmap = b, 0}; \
} \
\
\
void cachename##_free(struct cachename *cache) \
{ \
if (cache) { \
hm_destroy(cache->table); \
free(cache->array); \
free(cache->bitmap); \
} \
} \
\
\
const type * cachename##_search(struct cachename *cache, unsigned int code) \
{ \
if (!cache) \
return NULL; \
struct hm_entry *r = hm_search(cache->table, code); \
/* MISS */ \
if (!r) \
return NULL; \
/* HIT */ \
CACHE_SET(cache, (type *)(r->data)-cache->array); \
return (const type *)(r->data); \
} \
\
\
int cachename##_get(struct cachename *cache) \
{ \
if (!cache) \
return -1; \
int x = 0; \
for (int b = 0; b < CACHE_BSIZE; b++) { \
if (cache->bitmap[b] == 0) x = 64; \
else x = __builtin_clzll(cache->bitmap[b]); \
x = 64-x; \
if (!CACHE_BTEST(cache->bitmap, x+64*b)) \
return x+64*b; \
} \
return 0; \
} \
\
\
const type * cachename##_insert(struct cachename *cache, const type *g, unsigned int code, int x) \
{ \
if (!cache) \
return NULL; \
type *spot = NULL; \
/* x is the index to the cache array, it has to come from the user */ \
/* check if the spot is free */ \
if (x < 0 || CACHE_BTEST(cache->bitmap, x)) \
return NULL; \
CACHE_SET(cache, x) \
spot = &(cache->array[x]); \
*spot = *g; \
struct hm_entry e = { .code = code, .data = spot}; \
if (!hm_insert(cache->table, &e)) \
return NULL; \
return spot; \
} \
#endif