1 files changed, 126 insertions, 0 deletions
diff --git a/vendor/github.com/zeebo/xxh3/hash64.go b/vendor/github.com/zeebo/xxh3/hash64.go
new file mode 100644
index 000000000..13aab9585
--- /dev/null
+++ b/vendor/github.com/zeebo/xxh3/hash64.go
@@ -0,0 +1,126 @@
+package xxh3
+
+import "math/bits"
+
+// Hash returns the hash of the byte slice.
+func Hash(b []byte) uint64 {
+	return hashAny(*(*str)(ptr(&b)))
+}
+
+// Hash returns the hash of the string slice.
+func HashString(s string) uint64 {
+	return hashAny(*(*str)(ptr(&s)))
+}
+
+func hashAny(s str) (acc u64) {
+	p, l := s.p, s.l
+
+	switch {
+	case l <= 16:
+		switch {
+		case l > 8: // 9-16
+			inputlo := readU64(p, 0) ^ (key64_024 ^ key64_032)
+			inputhi := readU64(p, ui(l)-8) ^ (key64_040 ^ key64_048)
+			folded := mulFold64(inputlo, inputhi)
+			return xxh3Avalanche(u64(l) + bits.ReverseBytes64(inputlo) + inputhi + folded)
+
+		case l > 3: // 4-8
+			input1 := readU32(p, 0)
+			input2 := readU32(p, ui(l)-4)
+			input64 := u64(input2) + u64(input1)<<32
+			keyed := input64 ^ (key64_008 ^ key64_016)
+			return rrmxmx(keyed, u64(l))
+
+		case l == 3: // 3
+			c12 := u64(readU16(p, 0))
+			c3 := u64(readU8(p, 2))
+			acc = c12<<16 + c3 + 3<<8
+
+		case l > 1: // 2
+			c12 := u64(readU16(p, 0))
+			acc = c12*(1<<24+1)>>8 + 2<<8
+
+		case l == 1: // 1
+			c1 := u64(readU8(p, 0))
+			acc = c1*(1<<24+1<<16+1) + 1<<8
+
+		default: // 0
+			return 0x2d06800538d394c2 // xxh_avalanche(key64_056 ^ key64_064)
+		}
+
+		acc ^= u64(key32_000 ^ key32_004)
+		return xxhAvalancheSmall(acc)
+
+	case l <= 128:
+		acc = u64(l) * prime64_1
+
+		if l > 32 {
+			if l > 64 {
+				if l > 96 {
+					acc += mulFold64(readU64(p, 6*8)^key64_096, readU64(p, 7*8)^key64_104)
+					acc += mulFold64(readU64(p, ui(l)-8*8)^key64_112, readU64(p, ui(l)-7*8)^key64_120)
+				} // 96
+				acc += mulFold64(readU64(p, 4*8)^key64_064, readU64(p, 5*8)^key64_072)
+				acc += mulFold64(readU64(p, ui(l)-6*8)^key64_080, readU64(p, ui(l)-5*8)^key64_088)
+			} // 64
+			acc += mulFold64(readU64(p, 2*8)^key64_032, readU64(p, 3*8)^key64_040)
+			acc += mulFold64(readU64(p, ui(l)-4*8)^key64_048, readU64(p, ui(l)-3*8)^key64_056)
+		} // 32
+		acc += mulFold64(readU64(p, 0*8)^key64_000, readU64(p, 1*8)^key64_008)
+		acc += mulFold64(readU64(p, ui(l)-2*8)^key64_016, readU64(p, ui(l)-1*8)^key64_024)
+
+		return xxh3Avalanche(acc)
+
+	case l <= 240:
+		acc = u64(l) * prime64_1
+
+		acc += mulFold64(readU64(p, 0*16+0)^key64_000, readU64(p, 0*16+8)^key64_008)
+		acc += mulFold64(readU64(p, 1*16+0)^key64_016, readU64(p, 1*16+8)^key64_024)
+		acc += mulFold64(readU64(p, 2*16+0)^key64_032, readU64(p, 2*16+8)^key64_040)
+		acc += mulFold64(readU64(p, 3*16+0)^key64_048, readU64(p, 3*16+8)^key64_056)
+		acc += mulFold64(readU64(p, 4*16+0)^key64_064, readU64(p, 4*16+8)^key64_072)
+		acc += mulFold64(readU64(p, 5*16+0)^key64_080, readU64(p, 5*16+8)^key64_088)
+		acc += mulFold64(readU64(p, 6*16+0)^key64_096, readU64(p, 6*16+8)^key64_104)
+		acc += mulFold64(readU64(p, 7*16+0)^key64_112, readU64(p, 7*16+8)^key64_120)
+
+		// avalanche
+		acc = xxh3Avalanche(acc)
+
+		// trailing groups after 128
+		top := ui(l) &^ 15
+		for i := ui(8 * 16); i < top; i += 16 {
+			acc += mulFold64(readU64(p, i+0)^readU64(key, i-125), readU64(p, i+8)^readU64(key, i-117))
+		}
+
+		// last 16 bytes
+		acc += mulFold64(readU64(p, ui(l)-16)^key64_119, readU64(p, ui(l)-8)^key64_127)
+
+		return xxh3Avalanche(acc)
+
+	default:
+		acc = u64(l) * prime64_1
+
+		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, key, u64(l))
+		} else if hasAVX2 {
+			accumAVX2(&accs, p, key, u64(l))
+		} else if hasSSE2 {
+			accumSSE(&accs, p, key, u64(l))
+		} else {
+			accumScalar(&accs, p, key, u64(l))
+		}
+
+		// merge accs
+		acc += mulFold64(accs[0]^key64_011, accs[1]^key64_019)
+		acc += mulFold64(accs[2]^key64_027, accs[3]^key64_035)
+		acc += mulFold64(accs[4]^key64_043, accs[5]^key64_051)
+		acc += mulFold64(accs[6]^key64_059, accs[7]^key64_067)
+
+		return xxh3Avalanche(acc)
+	}
+}