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*A ^= a;
*B ^= b;
# else
// multiply
*A = _umul128(*A, *B, B);
# endif
#else
const uint64_t ha = *A >> 32, hb = *B >> 32;
const uint64_t la = (uint32_t) *A, lb = (uint32_t) *B;
const uint64_t rh = ha * hb, rl = la * lb;
const uint64_t rm0 = ha * lb, rm1 = hb * la;
const uint64_t t = rl + (rm0 << 32);
const uint64_t lo = t + (rm1 << 32);
const uint64_t hi = rh + (rm0 >> 32) + (rm1 >> 32) + (t < rl) + (lo < t);
# if U_WYMUM_XOR
// multiply -> xor
*A ^= lo;
*B ^= hi;
# else
// multiply
*A = lo;
*B = hi;
# endif
#endif
}
//multiply and xor mix function, aka MUM
static inline
uint64_t _wymix(uint64_t A, uint64_t B)
{
_wymum(&A,&B);
return A^B;
}
//read functions
#if defined(BSLS_PLATFORM_IS_LITTLE_ENDIAN)
static inline
uint64_t _wyr8(const uint8_t *p)
{
uint64_t v;
memcpy(&v, p, 8);
return v;
}
static inline
uint64_t _wyr4(const uint8_t *p)
{
uint32_t v;
memcpy(&v, p, 4);
return v;
}
#else
static inline
uint64_t _wyr8(const uint8_t *p)
{
bsls::Types::Uint64 v;
memcpy(&v, p, 8);
return bsls::ByteOrderUtil::swapBytes64(v);
}
static inline
uint64_t _wyr4(const uint8_t *p)
{
unsigned v;
memcpy(&v, p, 4);
return bsls::ByteOrderUtil::swapBytes32(v);
}
#endif
static inline
uint64_t _wyr3(const uint8_t *p, size_t k)
// Read a mix of the 'k' bytes beginning at 'p', where 'k' is in the range
// '[ 1 .. 3 ]'.
{
BSLS_ASSERT_SAFE(1 <= k && k <= 3);
return (((uint64_t) p[0]) << 16) | (((uint64_t) p[k >> 1]) << 8) |
p[k - 1];
}
//wyhash main function
static inline
uint64_t wyhash(const uint8_t *p,
size_t len,
uint64_t seed)
{
// These values were copied directly from the original source.