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package xxh3
import (
"math/bits"
)
// Hash128Seed returns the 128-bit hash of the byte slice.
func Hash128Seed(b []byte, seed uint64) Uint128 {
return hashAny128Seed(*(*str)(ptr(&b)), seed)
}
// HashString128Seed returns the 128-bit hash of the string slice.
func HashString128Seed(s string, seed uint64) Uint128 {
return hashAny128Seed(*(*str)(ptr(&s)), seed)
}
func hashAny128Seed(s str, seed uint64) (acc u128) {
p, l := s.p, s.l
switch {
case l <= 16:
switch {
case l > 8: // 9-16
bitflipl := (key64_032 ^ key64_040) - seed
bitfliph := (key64_048 ^ key64_056) + seed
input_lo := readU64(p, 0)
input_hi := readU64(p, ui(l)-8)
m128_h, m128_l := bits.Mul64(input_lo^input_hi^bitflipl, prime64_1)
m128_l += uint64(l-1) << 54
input_hi ^= bitfliph
m128_h += input_hi + uint64(uint32(input_hi))*(prime32_2-1)
m128_l ^= bits.ReverseBytes64(m128_h)
acc.Hi, acc.Lo = bits.Mul64(m128_l, prime64_2)
acc.Hi += m128_h * prime64_2
acc.Lo = xxh3Avalanche(acc.Lo)
acc.Hi = xxh3Avalanche(acc.Hi)
return acc
case l > 3: // 4-8
seed ^= u64(bits.ReverseBytes32(u32(seed))) << 32
bitflip := (key64_016 ^ key64_024) + seed
input_lo := readU32(p, 0)
input_hi := readU32(p, ui(l)-4)
input_64 := u64(input_lo) + u64(input_hi)<<32
keyed := input_64 ^ bitflip
acc.Hi, acc.Lo = bits.Mul64(keyed, prime64_1+(uint64(l)<<2))
acc.Hi += acc.Lo << 1
acc.Lo ^= acc.Hi >> 3
acc.Lo ^= acc.Lo >> 35
acc.Lo *= 0x9fb21c651e98df25
acc.Lo ^= acc.Lo >> 28
acc.Hi = xxh3Avalanche(acc.Hi)
return acc
case l == 3: // 3
c12 := u64(readU16(p, 0))
c3 := u64(readU8(p, 2))
acc.Lo = c12<<16 + c3 + 3<<8
case l > 1: // 2
c12 := u64(readU16(p, 0))
acc.Lo = c12*(1<<24+1)>>8 + 2<<8
case l == 1: // 1
c1 := u64(readU8(p, 0))
acc.Lo = c1*(1<<24+1<<16+1) + 1<<8
default: // 0
bitflipl := key64_064 ^ key64_072 ^ seed
bitfliph := key64_080 ^ key64_088 ^ seed
return u128{Lo: xxh64AvalancheFull(bitflipl), Hi: xxh64AvalancheFull(bitfliph)}
}
acc.Hi = uint64(bits.RotateLeft32(bits.ReverseBytes32(uint32(acc.Lo)), 13))
acc.Lo ^= uint64(key32_000^key32_004) + seed
acc.Hi ^= uint64(key32_008^key32_012) - seed
acc.Lo = xxh64AvalancheFull(acc.Lo)
acc.Hi = xxh64AvalancheFull(acc.Hi)
return acc
case l <= 128:
acc.Lo = u64(l) * prime64_1
if l > 32 {
if l > 64 {
if l > 96 {
in8, in7 := readU64(p, ui(l)-8*8), readU64(p, ui(l)-7*8)
i6, i7 := readU64(p, 6*8), readU64(p, 7*8)
acc.Hi += mulFold64(in8^(key64_112+seed), in7^(key64_120-seed))
acc.Hi ^= i6 + i7
acc.Lo += mulFold64(i6^(key64_096+seed), i7^(key64_104-seed))
acc.Lo ^= in8 + in7
} // 96
in6, in5 := readU64(p, ui(l)-6*8), readU64(p, ui(l)-5*8)
i4, i5 := readU64(p, 4*8), readU64(p, 5*8)
acc.Hi += mulFold64(in6^(key64_080+seed), in5^(key64_088-seed))
acc.Hi ^= i4 + i5
acc.Lo += mulFold64(i4^(key64_064+seed), i5^(key64_072-seed))
acc.Lo ^= in6 + in5
} // 64
in4, in3 := readU64(p, ui(l)-4*8), readU64(p, ui(l)-3*8)
i2, i3 := readU64(p, 2*8), readU64(p, 3*8)
acc.Hi += mulFold64(in4^(key64_048+seed), in3^(key64_056-seed))
acc.Hi ^= i2 + i3
acc.Lo += mulFold64(i2^(key64_032+seed), i3^(key64_040-seed))
acc.Lo ^= in4 + in3
} // 32
in2, in1 := readU64(p, ui(l)-2*8), readU64(p, ui(l)-1*8)
i0, i1 := readU64(p, 0*8), readU64(p, 1*8)
acc.Hi += mulFold64(in2^(key64_016+seed), in1^(key64_024-seed))
acc.Hi ^= i0 + i1
acc.Lo += mulFold64(i0^(key64_000+seed), i1^(key64_008-seed))
acc.Lo ^= in2 + in1
acc.Hi, acc.Lo = (acc.Lo*prime64_1)+(acc.Hi*prime64_4)+((u64(l)-seed)*prime64_2), acc.Hi+acc.Lo
acc.Hi = -xxh3Avalanche(acc.Hi)
acc.Lo = xxh3Avalanche(acc.Lo)
return acc
case l <= 240:
acc.Lo = u64(l) * prime64_1
{
i0, i1, i2, i3 := readU64(p, 0*8), readU64(p, 1*8), readU64(p, 2*8), readU64(p, 3*8)
acc.Hi += mulFold64(i2^(key64_016+seed), i3^(key64_024-seed))
acc.Hi ^= i0 + i1
acc.Lo += mulFold64(i0^(key64_000+seed), i1^(key64_008-seed))
acc.Lo ^= i2 + i3
}
{
i0, i1, i2, i3 := readU64(p, 4*8), readU64(p, 5*8), readU64(p, 6*8), readU64(p, 7*8)
acc.Hi += mulFold64(i2^(key64_048+seed), i3^(key64_056-seed))
acc.Hi ^= i0 + i1
acc.Lo += mulFold64(i0^(key64_032+seed), i1^(key64_040-seed))
acc.Lo ^= i2 + i3
}
{
i0, i1, i2, i3 := readU64(p, 8*8), readU64(p, 9*8), readU64(p, 10*8), readU64(p, 11*8)
acc.Hi += mulFold64(i2^(key64_080+seed), i3^(key64_088-seed))
acc.Hi ^= i0 + i1
acc.Lo += mulFold64(i0^(key64_064+seed), i1^(key64_072-seed))
acc.Lo ^= i2 + i3
}
{
i0, i1, i2, i3 := readU64(p, 12*8), readU64(p, 13*8), readU64(p, 14*8), readU64(p, 15*8)
acc.Hi += mulFold64(i2^(key64_112+seed), i3^(key64_120-seed))
acc.Hi ^= i0 + i1
acc.Lo += mulFold64(i0^(key64_096+seed), i1^(key64_104-seed))
acc.Lo ^= i2 + i3
}
// avalanche
acc.Hi = xxh3Avalanche(acc.Hi)
acc.Lo = xxh3Avalanche(acc.Lo)
// trailing groups after 128
top := ui(l) &^ 31
for i := ui(4 * 32); i < top; i += 32 {
i0, i1, i2, i3 := readU64(p, i+0), readU64(p, i+8), readU64(p, i+16), readU64(p, i+24)
k0, k1, k2, k3 := readU64(key, i-125)+seed, readU64(key, i-117)-seed, readU64(key, i-109)+seed, readU64(key, i-101)-seed
acc.Hi += mulFold64(i2^k2, i3^k3)
acc.Hi ^= i0 + i1
acc.Lo += mulFold64(i0^k0, i1^k1)
acc.Lo ^= i2 + i3
}
// last 32 bytes
{
i0, i1, i2, i3 := readU64(p, ui(l)-32), readU64(p, ui(l)-24), readU64(p, ui(l)-16), readU64(p, ui(l)-8)
seed := 0 - seed
acc.Hi += mulFold64(i0^(key64_119+seed), i1^(key64_127-seed))
acc.Hi ^= i2 + i3
acc.Lo += mulFold64(i2^(key64_103+seed), i3^(key64_111-seed))
acc.Lo ^= i0 + i1
}
acc.Hi, acc.Lo = (acc.Lo*prime64_1)+(acc.Hi*prime64_4)+((u64(l)-seed)*prime64_2), acc.Hi+acc.Lo
acc.Hi = -xxh3Avalanche(acc.Hi)
acc.Lo = xxh3Avalanche(acc.Lo)
return acc
default:
acc.Lo = u64(l) * prime64_1
acc.Hi = ^(u64(l) * prime64_2)
secret := key
if seed != 0 {
secret = ptr(&[secretSize]byte{})
initSecret(secret, seed)
}
accs := [8]u64{
prime32_3, prime64_1, prime64_2, prime64_3,
prime64_4, prime32_2, prime64_5, prime32_1,
}
if hasAVX512 && l >= avx512Switch {
accumAVX512(&accs, p, secret, u64(l))
} else if hasAVX2 {
accumAVX2(&accs, p, secret, u64(l))
} else if hasSSE2 {
accumSSE(&accs, p, secret, u64(l))
} else {
accumScalar(&accs, p, secret, u64(l))
}
// merge accs
const hi_off = 117 - 11
acc.Lo += mulFold64(accs[0]^readU64(secret, 11), accs[1]^readU64(secret, 19))
acc.Hi += mulFold64(accs[0]^readU64(secret, 11+hi_off), accs[1]^readU64(secret, 19+hi_off))
acc.Lo += mulFold64(accs[2]^readU64(secret, 27), accs[3]^readU64(secret, 35))
acc.Hi += mulFold64(accs[2]^readU64(secret, 27+hi_off), accs[3]^readU64(secret, 35+hi_off))
acc.Lo += mulFold64(accs[4]^readU64(secret, 43), accs[5]^readU64(secret, 51))
acc.Hi += mulFold64(accs[4]^readU64(secret, 43+hi_off), accs[5]^readU64(secret, 51+hi_off))
acc.Lo += mulFold64(accs[6]^readU64(secret, 59), accs[7]^readU64(secret, 67))
acc.Hi += mulFold64(accs[6]^readU64(secret, 59+hi_off), accs[7]^readU64(secret, 67+hi_off))
acc.Lo = xxh3Avalanche(acc.Lo)
acc.Hi = xxh3Avalanche(acc.Hi)
return acc
}
}
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