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Merge pull request #391 from jserv/improve-align-down

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Rewrite align_down with bitwise operations
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Daan 2021-04-28 13:07:13 -07:00 • committed by GitHub
commit 6d1658123c
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1 changed files with 5 additions and 1 deletions
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src/os.c
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@ -65,7 +65,11 @@ static void* mi_align_up_ptr(void* p, size_t alignment) {
return (void*)_mi_align_up((uintptr_t)p, alignment);
}
static uintptr_t _mi_align_down(uintptr_t sz, size_t alignment) {
static inline uintptr_t _mi_align_down(uintptr_t sz, size_t alignment) {
mi_assert_internal(alignment != 0);
uintptr_t mask = alignment - 1;
if ((alignment & mask) == 0) // power of two?
return sz & ~mask;
return (sz / alignment) * alignment;
}