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simplified aligned allocation; improved codegen; fix mi_good_size with padding included; add MI_MAX_ALIGN_GUARANTEE

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Daan
2024-05-11 06:43:52 -07:00
parent c70c1df16a
commit 7128db7bba
7 changed files with 69 additions and 55 deletions
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12
src/segment.c
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@@ -426,15 +426,13 @@ uint8_t* _mi_segment_page_start(const mi_segment_t* segment, const mi_page_t* pa
size_t psize;
uint8_t* p = mi_segment_raw_page_start(segment, page, &psize);
const size_t block_size = mi_page_block_size(page);
if (page->segment_idx == 0 && block_size > 0 && segment->page_kind <= MI_PAGE_MEDIUM) {
if (/*page->segment_idx == 0 &&*/ block_size > 0 && block_size <= MI_MAX_ALIGN_GUARANTEE) {
// for small and medium objects, ensure the page start is aligned with the block size (PR#66 by kickunderscore)
mi_assert_internal(segment->page_kind <= MI_PAGE_MEDIUM);
size_t adjust = block_size - ((uintptr_t)p % block_size);
if (psize - adjust >= block_size) {
if (adjust < block_size) {
p += adjust;
psize -= adjust;
// if (pre_size != NULL) *pre_size = adjust;
}
if (adjust < block_size && psize >= block_size + adjust) {
p += adjust;
psize -= adjust;
mi_assert_internal((uintptr_t)p % block_size == 0);
}
}