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Rewrite align_down with bitwise operations

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mi_align_down_ptr was implemented with multiplication and division,
which can be converted to equivalent and deterministic bit operations.
This commit is contained in:
Jim Huang 2021-04-21 13:14:53 +00:00
parent b19da8e362
commit 52943917ad
1 changed files with 5 additions and 1 deletions
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6
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); 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; return (sz / alignment) * alignment;
} }