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This commit is contained in:
daanx 2024-12-08 18:27:05 -08:00
commit 88990cec2d
7 changed files with 59 additions and 14 deletions
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50
test/main-override-static.c
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@ -43,8 +43,7 @@ int main() {
// test_heap_walk();
// alloc_huge();
mi_bins();
// mi_bins();
void* p1 = malloc(78);
void* p2 = malloc(24);
@ -281,7 +280,7 @@ static void test_large_pages(void) {
// bin size experiments
// ------------------------------
#if 1
#if 0
#include <stdint.h>
#include <stdbool.h>
#include <mimalloc/bits.h>
@ -291,6 +290,51 @@ static void test_large_pages(void) {
#define MI_BIN_HUGE 100
//#define MI_ALIGN2W
// Bit scan reverse: return the index of the highest bit.
static inline uint8_t mi_bsr32(uint32_t x);
#if defined(_MSC_VER)
//#include <Windows.h>
#include <intrin.h>
static inline uint8_t mi_bsr32(uint32_t x) {
uint32_t idx;
_BitScanReverse(&idx, x);
return idx;
}
#elif defined(__GNUC__) || defined(__clang__)
static inline uint8_t mi_bsr32(uint32_t x) {
return (31 - __builtin_clz(x));
}
#else
static inline uint8_t mi_bsr32(uint32_t x) {
// de Bruijn multiplication, see <http://supertech.csail.mit.edu/papers/debruijn.pdf>
static const uint8_t debruijn[32] = {
31, 0, 22, 1, 28, 23, 18, 2, 29, 26, 24, 10, 19, 7, 3, 12,
30, 21, 27, 17, 25, 9, 6, 11, 20, 16, 8, 5, 15, 4, 14, 13,
};
x |= x >> 1;
x |= x >> 2;
x |= x >> 4;
x |= x >> 8;
x |= x >> 16;
x++;
return debruijn[(x*0x076be629) >> 27];
}
#endif
// Bit scan reverse: return the index of the highest bit.
uint8_t _mi_bsr(uintptr_t x) {
if (x == 0) return 0;
#if MI_INTPTR_SIZE==8
uint32_t hi = (x >> 32);
return (hi == 0 ? mi_bsr32((uint32_t)x) : 32 + mi_bsr32(hi));
#elif MI_INTPTR_SIZE==4
return mi_bsr32(x);
#else
# error "define bsr for non-32 or 64-bit platforms"
#endif
}
static inline size_t _mi_wsize_from_size(size_t size) {
return (size + sizeof(uintptr_t) - 1) / sizeof(uintptr_t);