You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
119 lines
6.8 KiB
119 lines
6.8 KiB
#ifndef CACHE_GENERIC_H
|
|
#define CACHE_GENERIC_H
|
|
|
|
|
|
#include "generic_hash.h"
|
|
|
|
#define CACHE_SIZE 512
|
|
#define CACHE_NCYCLES (CACHE_SIZE*2/3)
|
|
#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)&63)
|
|
#define CACHE_BTEST(b, x) (b[(x)>>6]&((uint64_t)1<<((x)&63)))
|
|
|
|
// FIXME: this cache implementation is not really generic since it expects an unsigned
|
|
// as the code and not a generic type
|
|
|
|
|
|
#define CACHE_USED(c, x) \
|
|
{ \
|
|
if (++(c->cycles) > CACHE_NCYCLES) { \
|
|
for (int i = 0; i < CACHE_BSIZE; i++) { \
|
|
c->present[i] &= c->used[i]; \
|
|
c->used[i] = 0; \
|
|
} \
|
|
c->cycles = 0; \
|
|
} \
|
|
CACHE_BSET(c->used, x); \
|
|
}
|
|
|
|
|
|
#define CACHE_DECL(name, type, hashfn, cmpfn) \
|
|
HASH_DECL(name##table, uint32_t, uint32_t, hashfn, cmpfn) \
|
|
struct name { \
|
|
struct name##table_ref *table; \
|
|
type *array; \
|
|
uint64_t *present, *used; \
|
|
int cycles; \
|
|
}; \
|
|
\
|
|
\
|
|
/* FIXME: check for allocation errors */ \
|
|
struct name name##_init(void) \
|
|
{ \
|
|
struct name##table_ref *t = name##table_create(CACHE_SIZE); \
|
|
type *a = malloc(sizeof(type)*CACHE_SIZE); \
|
|
uint64_t *p = malloc(sizeof(uint64_t)*CACHE_BSIZE); \
|
|
uint64_t *u = malloc(sizeof(uint64_t)*CACHE_BSIZE); \
|
|
CACHE_BRESET(p); \
|
|
CACHE_BRESET(u); \
|
|
return (struct name){.table=t, .array=a, .present=p, .used=u, 0}; \
|
|
} \
|
|
\
|
|
\
|
|
void name##_free(struct name *cache) \
|
|
{ \
|
|
if (cache) { \
|
|
name##table_destroy(cache->table); \
|
|
free(cache->array); \
|
|
free(cache->present); \
|
|
free(cache->used); \
|
|
} \
|
|
} \
|
|
\
|
|
\
|
|
const type * name##_search(struct name *cache, uint32_t code) \
|
|
{ \
|
|
if (!cache) return NULL; \
|
|
struct name##table_entry *r; \
|
|
r = name##table_search(cache->table, code); \
|
|
/* MISS */ \
|
|
if (!r || !cmpfn(code, r->code)) \
|
|
return NULL; \
|
|
/* MISS, the data is not valid (not present) */ \
|
|
if (!CACHE_BTEST(cache->present, r->data)) \
|
|
return NULL; \
|
|
/* HIT, set as recently used */ \
|
|
CACHE_USED(cache, r->data); \
|
|
return (&cache->array[r->data]); \
|
|
} \
|
|
\
|
|
\
|
|
/* Look for a free spot in the present bitmap and return its index */ \
|
|
int name##_get(struct name *cache) \
|
|
{ \
|
|
if (!cache) return -1; \
|
|
int x = 0; \
|
|
for (int b = 0; b < CACHE_BSIZE; b++) { \
|
|
if (cache->present[b] == 0) x = 64; \
|
|
else x = __builtin_clzll(cache->present[b]); \
|
|
x = 64-x; \
|
|
if (!CACHE_BTEST(cache->present, x+64*b)) \
|
|
return x+64*b; \
|
|
} \
|
|
return 0; \
|
|
} \
|
|
\
|
|
\
|
|
const type * name##_insert(struct name *cache, const type *g, uint32_t 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->present, x)) \
|
|
return NULL; \
|
|
/* Set used and present */ \
|
|
CACHE_USED(cache, x) \
|
|
CACHE_BSET(cache->present, x); \
|
|
CACHE_BSET(cache->used, x); \
|
|
spot = &(cache->array[x]); \
|
|
*spot = *g; \
|
|
struct name##table_entry e = { .code = code, .data = x}; \
|
|
if (!name##table_insert(cache->table, &e)) \
|
|
return NULL; \
|
|
return spot; \
|
|
} \
|
|
|
|
|
|
#endif
|
|
|