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better instruction scheduling for alloc

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This commit is contained in:
daan 2020-10-15 19:46:33 -07:00
parent 69f935944f
commit ca13e9cd59
1 changed files with 6 additions and 2 deletions
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8
src/alloc.c
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@ -23,20 +23,22 @@ terms of the MIT license. A copy of the license can be found in the file
// Fall back to generic allocation only if the list is empty.
extern inline void* _mi_page_malloc(mi_heap_t* heap, mi_page_t* page, size_t size) mi_attr_noexcept {
mi_assert_internal(page->xblock_size==0||mi_page_block_size(page) >= size);
mi_block_t* block = page->free;
mi_block_t* const block = page->free;
if (mi_unlikely(block == NULL)) {
return _mi_malloc_generic(heap, size);
}
mi_assert_internal(block != NULL && _mi_ptr_page(block) == page);
// pop from the free list
page->free = mi_block_next(page, block);
page->used++;
page->free = mi_block_next(page, block);
mi_assert_internal(page->free == NULL || _mi_ptr_page(page->free) == page);
#if (MI_DEBUG>0)
if (!page->is_zero) { memset(block, MI_DEBUG_UNINIT, size); }
#elif (MI_SECURE!=0)
block->next = 0; // don't leak internal data
#endif
#if (MI_STAT>1)
const size_t bsize = mi_page_usable_block_size(page);
if (bsize <= MI_LARGE_OBJ_SIZE_MAX) {
@ -44,6 +46,7 @@ extern inline void* _mi_page_malloc(mi_heap_t* heap, mi_page_t* page, size_t siz
mi_heap_stat_increase(heap, normal[bin], 1);
}
#endif
#if (MI_PADDING > 0) && defined(MI_ENCODE_FREELIST)
mi_padding_t* const padding = (mi_padding_t*)((uint8_t*)block + mi_page_usable_block_size(page));
ptrdiff_t delta = ((uint8_t*)padding - (uint8_t*)block - (size - MI_PADDING_SIZE));
@ -54,6 +57,7 @@ extern inline void* _mi_page_malloc(mi_heap_t* heap, mi_page_t* page, size_t siz
const size_t maxpad = (delta > MI_MAX_ALIGN_SIZE ? MI_MAX_ALIGN_SIZE : delta); // set at most N initial padding bytes
for (size_t i = 0; i < maxpad; i++) { fill[i] = MI_DEBUG_PADDING; }
#endif
return block;
}