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fix alignment issue #700

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Daan Leijen 2023-03-20 12:29:36 -07:00
parent 90f866c5bc
commit 4bf63300b3
4 changed files with 31 additions and 2 deletions
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4
src/segment.c
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@ -316,7 +316,9 @@ static uint8_t* _mi_segment_page_start_from_slice(const mi_segment_t* segment, c
ptrdiff_t idx = slice - segment->slices;
size_t psize = (size_t)slice->slice_count * MI_SEGMENT_SLICE_SIZE;
// make the start not OS page aligned for smaller blocks to avoid page/cache effects
size_t start_offset = (xblock_size >= MI_INTPTR_SIZE && xblock_size <= 1024 ? 3*MI_MAX_ALIGN_GUARANTEE : 0);
// note: the offset must always be an xblock_size multiple since we assume small allocations
// are aligned (see `mi_heap_malloc_aligned`).
size_t start_offset = (xblock_size >= MI_INTPTR_SIZE && xblock_size <= 512 ? xblock_size : 0);
if (page_size != NULL) { *page_size = psize - start_offset; }
return (uint8_t*)segment + ((idx*MI_SEGMENT_SLICE_SIZE) + start_offset);
}