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Don't calculate things twice

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This commit is contained in:
Luke Benstead 2023-09-01 08:52:01 +01:00
parent 4b47f6878f
commit cfbaea4a46
1 changed files with 18 additions and 3 deletions
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21
GL/alloc/alloc.c
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@ -101,7 +101,13 @@ size_t alloc_block_count(void* pool) {
return pool_header.block_count;
}
void* alloc_next_available_ex(void* pool, size_t required_size, size_t* start_subblock, size_t* required_subblocks);
void* alloc_next_available(void* pool, size_t required_size) {
return alloc_next_available_ex(pool, required_size, NULL, NULL);
}
void* alloc_next_available_ex(void* pool, size_t required_size, size_t* start_subblock_out, size_t* required_subblocks_out) {
(void) pool;
uint8_t* it = pool_header.block_usage;
@ -110,6 +116,10 @@ void* alloc_next_available(void* pool, size_t required_size) {
uint8_t* end = pool_header.block_usage + pool_header.block_count;
if(required_subblocks_out) {
*required_subblocks_out = required_subblocks;
}
while(it < end) {
// Skip full blocks
while((*it) == 255) {
@ -155,6 +165,11 @@ void* alloc_next_available(void* pool, size_t required_size) {
uintptr_t offset = (it - pool_header.block_usage) * 8;
offset += (i + 1);
offset -= required_subblocks;
if(start_subblock_out) {
*start_subblock_out = offset;
}
return pool_header.base_address + (offset * 256);
}
}
@ -226,14 +241,14 @@ static inline uint32_t subblock_from_pointer(void* p) {
}
void* alloc_malloc(void* pool, size_t size) {
void* ret = alloc_next_available(pool, size);
size_t start_subblock, required_subblocks;
void* ret = alloc_next_available_ex(pool, size, &start_subblock, &required_subblocks);
if(size >= 2048) {
assert(((uintptr_t) ret) % 2048 == 0);
}
if(ret) {
uintptr_t start_subblock = subblock_from_pointer(ret);
uint32_t required_subblocks = size_to_subblock_count(size);
size_t offset = start_subblock % 8;
size_t block = start_subblock / 8;
uint8_t mask = 0;