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use mi_is_power_of_two when possible (pr #118)

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This commit is contained in:
daan 2019-09-09 08:12:50 -07:00
parent b104e434e4
commit ce81af1119
2 changed files with 5 additions and 3 deletions
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6
include/mimalloc-internal.h
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@ -167,10 +167,12 @@ static inline bool mi_mul_overflow(size_t count, size_t size, size_t* total) {
#endif
}
// Align upwards
static inline uintptr_t _mi_is_power_of_two(uintptr_t x) {
// Is `x` a power of two?
static inline bool _mi_is_power_of_two(uintptr_t x) {
return ((x & (x - 1)) == 0);
}
// Align upwards
static inline uintptr_t _mi_align_up(uintptr_t sz, size_t alignment) {
uintptr_t mask = alignment - 1;
if ((alignment & mask) == 0) { // power of two?

2
src/alloc-posix.c
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@ -48,7 +48,7 @@ int mi_posix_memalign(void** p, size_t alignment, size_t size) mi_attr_noexcept
// <http://man7.org/linux/man-pages/man3/posix_memalign.3.html>
if (p == NULL) return EINVAL;
if (alignment % sizeof(void*) != 0) return EINVAL; // natural alignment
if ((alignment & (alignment - 1)) != 0) return EINVAL; // not a power of 2
if (!_mi_is_power_of_two(alignment)) return EINVAL; // not a power of 2
void* q = mi_malloc_aligned(size, alignment);
if (q==NULL && size != 0) return ENOMEM;
*p = q;