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update free list encoding to stronger formula with addition last

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daan 2019-12-28 15:17:49 -08:00
parent e3391d9a53
commit 77134e1ad0
2 changed files with 18 additions and 13 deletions
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2
src/page.c
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@ -479,7 +479,7 @@ static void mi_page_free_list_extend_secure(mi_heap_t* const heap, mi_page_t* co
counts[current]--;
mi_block_t* const free_start = blocks[current];
// and iterate through the rest; use `random_shuffle` for performance
uintptr_t rnd = _mi_random_shuffle(r);
uintptr_t rnd = _mi_random_shuffle(r|1); // ensure not 0
for (size_t i = 1; i < extend; i++) {
// call random_shuffle only every INTPTR_SIZE rounds
const size_t round = i%MI_INTPTR_SIZE;