cosmopolitan/libc/str/knuthmultiplicativehash.h

16 lines
539 B
C

#ifndef COSMOPOLITAN_LIBC_STR_KNUTHMULTIPLICATIVEHASH_H_
#define COSMOPOLITAN_LIBC_STR_KNUTHMULTIPLICATIVEHASH_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
forceinline uint32_t KnuthMultiplicativeHash32(const void *buf, size_t size) {
size_t i;
uint32_t h;
const uint32_t kPhiPrime = 0x9e3779b1;
const unsigned char *p = (const unsigned char *)buf;
for (h = i = 0; i < size; i++) h = (p[i] + h) * kPhiPrime;
return h;
}
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_STR_KNUTHMULTIPLICATIVEHASH_H_ */