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small optimizations, use bitwise aligne

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daan 2019-07-22 20:51:12 -07:00
parent 66b8c37ab3
commit 189ad0f81d
9 changed files with 59 additions and 32 deletions
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26
include/mimalloc-internal.h
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@ -39,7 +39,6 @@ bool _mi_preloading(); // true while the C runtime is not ready
// os.c
size_t _mi_os_page_size(void);
uintptr_t _mi_align_up(uintptr_t sz, size_t alignment);
void _mi_os_init(void); // called from process init
void* _mi_os_alloc(size_t size, mi_stats_t* stats); // to allocate thread local data
void _mi_os_free(void* p, size_t size, mi_stats_t* stats); // to free thread local data
@ -165,6 +164,20 @@ static inline bool mi_mul_overflow(size_t size, size_t count, size_t* total) {
#endif
}
// Align upwards
static inline uintptr_t _mi_is_power_of_two(uintptr_t x) {
return ((x & (x - 1)) == 0);
}
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?
return ((sz + mask) & ~mask);
}
else {
return (((sz + mask)/alignment)*alignment);
}
}
// Align a byte size to a size in _machine words_,
// i.e. byte size == `wsize*sizeof(void*)`.
static inline size_t _mi_wsize_from_size(size_t size) {
@ -324,12 +337,23 @@ static inline void mi_block_set_nextx(uintptr_t cookie, mi_block_t* block, mi_bl
}
static inline mi_block_t* mi_block_next(mi_page_t* page, mi_block_t* block) {
#if MI_SECURE
return mi_block_nextx(page->cookie,block);
#else
UNUSED(page);
return mi_block_nextx(0, block);
#endif
}
static inline void mi_block_set_next(mi_page_t* page, mi_block_t* block, mi_block_t* next) {
#if MI_SECURE
mi_block_set_nextx(page->cookie,block,next);
#else
UNUSED(page);
mi_block_set_nextx(0, block, next);
#endif
}
// -------------------------------------------------------------------
// Getting the thread id should be performant
// as it is called in the fast path of `_mi_free`,