diff options
Diffstat (limited to 'src/Ryujinx.Common/XXHash128.cs')
| -rw-r--r-- | src/Ryujinx.Common/XXHash128.cs | 537 |
1 files changed, 537 insertions, 0 deletions
diff --git a/src/Ryujinx.Common/XXHash128.cs b/src/Ryujinx.Common/XXHash128.cs new file mode 100644 index 00000000..edbc652f --- /dev/null +++ b/src/Ryujinx.Common/XXHash128.cs @@ -0,0 +1,537 @@ +using System; +using System.Buffers.Binary; +using System.Diagnostics; +using System.Numerics; +using System.Runtime.CompilerServices; +using System.Runtime.Intrinsics; +using System.Runtime.Intrinsics.X86; + +namespace Ryujinx.Common +{ + public static class XXHash128 + { + private const int StripeLen = 64; + private const int AccNb = StripeLen / sizeof(ulong); + private const int SecretConsumeRate = 8; + private const int SecretLastAccStart = 7; + private const int SecretMergeAccsStart = 11; + private const int SecretSizeMin = 136; + private const int MidSizeStartOffset = 3; + private const int MidSizeLastOffset = 17; + + private const uint Prime32_1 = 0x9E3779B1U; + private const uint Prime32_2 = 0x85EBCA77U; + private const uint Prime32_3 = 0xC2B2AE3DU; + private const uint Prime32_4 = 0x27D4EB2FU; + private const uint Prime32_5 = 0x165667B1U; + + private const ulong Prime64_1 = 0x9E3779B185EBCA87UL; + private const ulong Prime64_2 = 0xC2B2AE3D27D4EB4FUL; + private const ulong Prime64_3 = 0x165667B19E3779F9UL; + private const ulong Prime64_4 = 0x85EBCA77C2B2AE63UL; + private const ulong Prime64_5 = 0x27D4EB2F165667C5UL; + + private static readonly ulong[] Xxh3InitAcc = new ulong[] + { + Prime32_3, + Prime64_1, + Prime64_2, + Prime64_3, + Prime64_4, + Prime32_2, + Prime64_5, + Prime32_1 + }; + + private static ReadOnlySpan<byte> Xxh3KSecret => new byte[] + { + 0xb8, 0xfe, 0x6c, 0x39, 0x23, 0xa4, 0x4b, 0xbe, 0x7c, 0x01, 0x81, 0x2c, 0xf7, 0x21, 0xad, 0x1c, + 0xde, 0xd4, 0x6d, 0xe9, 0x83, 0x90, 0x97, 0xdb, 0x72, 0x40, 0xa4, 0xa4, 0xb7, 0xb3, 0x67, 0x1f, + 0xcb, 0x79, 0xe6, 0x4e, 0xcc, 0xc0, 0xe5, 0x78, 0x82, 0x5a, 0xd0, 0x7d, 0xcc, 0xff, 0x72, 0x21, + 0xb8, 0x08, 0x46, 0x74, 0xf7, 0x43, 0x24, 0x8e, 0xe0, 0x35, 0x90, 0xe6, 0x81, 0x3a, 0x26, 0x4c, + 0x3c, 0x28, 0x52, 0xbb, 0x91, 0xc3, 0x00, 0xcb, 0x88, 0xd0, 0x65, 0x8b, 0x1b, 0x53, 0x2e, 0xa3, + 0x71, 0x64, 0x48, 0x97, 0xa2, 0x0d, 0xf9, 0x4e, 0x38, 0x19, 0xef, 0x46, 0xa9, 0xde, 0xac, 0xd8, + 0xa8, 0xfa, 0x76, 0x3f, 0xe3, 0x9c, 0x34, 0x3f, 0xf9, 0xdc, 0xbb, 0xc7, 0xc7, 0x0b, 0x4f, 0x1d, + 0x8a, 0x51, 0xe0, 0x4b, 0xcd, 0xb4, 0x59, 0x31, 0xc8, 0x9f, 0x7e, 0xc9, 0xd9, 0x78, 0x73, 0x64, + 0xea, 0xc5, 0xac, 0x83, 0x34, 0xd3, 0xeb, 0xc3, 0xc5, 0x81, 0xa0, 0xff, 0xfa, 0x13, 0x63, 0xeb, + 0x17, 0x0d, 0xdd, 0x51, 0xb7, 0xf0, 0xda, 0x49, 0xd3, 0x16, 0x55, 0x26, 0x29, 0xd4, 0x68, 0x9e, + 0x2b, 0x16, 0xbe, 0x58, 0x7d, 0x47, 0xa1, 0xfc, 0x8f, 0xf8, 0xb8, 0xd1, 0x7a, 0xd0, 0x31, 0xce, + 0x45, 0xcb, 0x3a, 0x8f, 0x95, 0x16, 0x04, 0x28, 0xaf, 0xd7, 0xfb, 0xca, 0xbb, 0x4b, 0x40, 0x7e + }; + + [MethodImpl(MethodImplOptions.AggressiveInlining)] + private static ulong Mult32To64(ulong x, ulong y) + { + return (ulong)(uint)x * (ulong)(uint)y; + } + + [MethodImpl(MethodImplOptions.AggressiveInlining)] + private static Hash128 Mult64To128(ulong lhs, ulong rhs) + { + ulong high = Math.BigMul(lhs, rhs, out ulong low); + return new Hash128 + { + Low = low, + High = high + }; + } + + [MethodImpl(MethodImplOptions.AggressiveInlining)] + private static ulong Mul128Fold64(ulong lhs, ulong rhs) + { + Hash128 product = Mult64To128(lhs, rhs); + return product.Low ^ product.High; + } + + [MethodImpl(MethodImplOptions.AggressiveInlining)] + private static ulong XorShift64(ulong v64, int shift) + { + Debug.Assert(0 <= shift && shift < 64); + return v64 ^ (v64 >> shift); + } + + [MethodImpl(MethodImplOptions.AggressiveInlining)] + private static ulong Xxh3Avalanche(ulong h64) + { + h64 = XorShift64(h64, 37); + h64 *= 0x165667919E3779F9UL; + h64 = XorShift64(h64, 32); + return h64; + } + + [MethodImpl(MethodImplOptions.AggressiveInlining)] + private static ulong Xxh64Avalanche(ulong h64) + { + h64 ^= h64 >> 33; + h64 *= Prime64_2; + h64 ^= h64 >> 29; + h64 *= Prime64_3; + h64 ^= h64 >> 32; + return h64; + } + + [MethodImpl(MethodImplOptions.AggressiveInlining)] + private unsafe static void Xxh3Accumulate512(Span<ulong> acc, ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret) + { + if (Avx2.IsSupported) + { + fixed (ulong* pAcc = acc) + { + fixed (byte* pInput = input, pSecret = secret) + { + Vector256<ulong>* xAcc = (Vector256<ulong>*)pAcc; + Vector256<byte>* xInput = (Vector256<byte>*)pInput; + Vector256<byte>* xSecret = (Vector256<byte>*)pSecret; + + for (ulong i = 0; i < StripeLen / 32; i++) + { + Vector256<byte> dataVec = xInput[i]; + Vector256<byte> keyVec = xSecret[i]; + Vector256<byte> dataKey = Avx2.Xor(dataVec, keyVec); + Vector256<uint> dataKeyLo = Avx2.Shuffle(dataKey.AsUInt32(), 0b00110001); + Vector256<ulong> product = Avx2.Multiply(dataKey.AsUInt32(), dataKeyLo); + Vector256<uint> dataSwap = Avx2.Shuffle(dataVec.AsUInt32(), 0b01001110); + Vector256<ulong> sum = Avx2.Add(xAcc[i], dataSwap.AsUInt64()); + xAcc[i] = Avx2.Add(product, sum); + } + } + } + } + else if (Sse2.IsSupported) + { + fixed (ulong* pAcc = acc) + { + fixed (byte* pInput = input, pSecret = secret) + { + Vector128<ulong>* xAcc = (Vector128<ulong>*)pAcc; + Vector128<byte>* xInput = (Vector128<byte>*)pInput; + Vector128<byte>* xSecret = (Vector128<byte>*)pSecret; + + for (ulong i = 0; i < StripeLen / 16; i++) + { + Vector128<byte> dataVec = xInput[i]; + Vector128<byte> keyVec = xSecret[i]; + Vector128<byte> dataKey = Sse2.Xor(dataVec, keyVec); + Vector128<uint> dataKeyLo = Sse2.Shuffle(dataKey.AsUInt32(), 0b00110001); + Vector128<ulong> product = Sse2.Multiply(dataKey.AsUInt32(), dataKeyLo); + Vector128<uint> dataSwap = Sse2.Shuffle(dataVec.AsUInt32(), 0b01001110); + Vector128<ulong> sum = Sse2.Add(xAcc[i], dataSwap.AsUInt64()); + xAcc[i] = Sse2.Add(product, sum); + } + } + } + } + else + { + for (int i = 0; i < AccNb; i++) + { + ulong dataVal = BinaryPrimitives.ReadUInt64LittleEndian(input.Slice(i * sizeof(ulong))); + ulong dataKey = dataVal ^ BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(i * sizeof(ulong))); + acc[i ^ 1] += dataVal; + acc[i] += Mult32To64((uint)dataKey, dataKey >> 32); + } + } + } + + [MethodImpl(MethodImplOptions.AggressiveInlining)] + private unsafe static void Xxh3ScrambleAcc(Span<ulong> acc, ReadOnlySpan<byte> secret) + { + if (Avx2.IsSupported) + { + fixed (ulong* pAcc = acc) + { + fixed (byte* pSecret = secret) + { + Vector256<uint> prime32 = Vector256.Create(Prime32_1); + Vector256<ulong>* xAcc = (Vector256<ulong>*)pAcc; + Vector256<byte>* xSecret = (Vector256<byte>*)pSecret; + + for (ulong i = 0; i < StripeLen / 32; i++) + { + Vector256<ulong> accVec = xAcc[i]; + Vector256<ulong> shifted = Avx2.ShiftRightLogical(accVec, 47); + Vector256<ulong> dataVec = Avx2.Xor(accVec, shifted); + + Vector256<byte> keyVec = xSecret[i]; + Vector256<uint> dataKey = Avx2.Xor(dataVec.AsUInt32(), keyVec.AsUInt32()); + + Vector256<uint> dataKeyHi = Avx2.Shuffle(dataKey.AsUInt32(), 0b00110001); + Vector256<ulong> prodLo = Avx2.Multiply(dataKey, prime32); + Vector256<ulong> prodHi = Avx2.Multiply(dataKeyHi, prime32); + + xAcc[i] = Avx2.Add(prodLo, Avx2.ShiftLeftLogical(prodHi, 32)); + } + } + } + } + else if (Sse2.IsSupported) + { + fixed (ulong* pAcc = acc) + { + fixed (byte* pSecret = secret) + { + Vector128<uint> prime32 = Vector128.Create(Prime32_1); + Vector128<ulong>* xAcc = (Vector128<ulong>*)pAcc; + Vector128<byte>* xSecret = (Vector128<byte>*)pSecret; + + for (ulong i = 0; i < StripeLen / 16; i++) + { + Vector128<ulong> accVec = xAcc[i]; + Vector128<ulong> shifted = Sse2.ShiftRightLogical(accVec, 47); + Vector128<ulong> dataVec = Sse2.Xor(accVec, shifted); + + Vector128<byte> keyVec = xSecret[i]; + Vector128<uint> dataKey = Sse2.Xor(dataVec.AsUInt32(), keyVec.AsUInt32()); + + Vector128<uint> dataKeyHi = Sse2.Shuffle(dataKey.AsUInt32(), 0b00110001); + Vector128<ulong> prodLo = Sse2.Multiply(dataKey, prime32); + Vector128<ulong> prodHi = Sse2.Multiply(dataKeyHi, prime32); + + xAcc[i] = Sse2.Add(prodLo, Sse2.ShiftLeftLogical(prodHi, 32)); + } + } + } + } + else + { + for (int i = 0; i < AccNb; i++) + { + ulong key64 = BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(i * sizeof(ulong))); + ulong acc64 = acc[i]; + acc64 = XorShift64(acc64, 47); + acc64 ^= key64; + acc64 *= Prime32_1; + acc[i] = acc64; + } + } + } + + [MethodImpl(MethodImplOptions.AggressiveInlining)] + private static void Xxh3Accumulate(Span<ulong> acc, ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret, int nbStripes) + { + for (int n = 0; n < nbStripes; n++) + { + ReadOnlySpan<byte> inData = input.Slice(n * StripeLen); + Xxh3Accumulate512(acc, inData, secret.Slice(n * SecretConsumeRate)); + } + } + + private static void Xxh3HashLongInternalLoop(Span<ulong> acc, ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret) + { + int nbStripesPerBlock = (secret.Length - StripeLen) / SecretConsumeRate; + int blockLen = StripeLen * nbStripesPerBlock; + int nbBlocks = (input.Length - 1) / blockLen; + + Debug.Assert(secret.Length >= SecretSizeMin); + + for (int n = 0; n < nbBlocks; n++) + { + Xxh3Accumulate(acc, input.Slice(n * blockLen), secret, nbStripesPerBlock); + Xxh3ScrambleAcc(acc, secret.Slice(secret.Length - StripeLen)); + } + + Debug.Assert(input.Length > StripeLen); + + int nbStripes = (input.Length - 1 - (blockLen * nbBlocks)) / StripeLen; + Debug.Assert(nbStripes <= (secret.Length / SecretConsumeRate)); + Xxh3Accumulate(acc, input.Slice(nbBlocks * blockLen), secret, nbStripes); + + ReadOnlySpan<byte> p = input.Slice(input.Length - StripeLen); + Xxh3Accumulate512(acc, p, secret.Slice(secret.Length - StripeLen - SecretLastAccStart)); + } + + [MethodImpl(MethodImplOptions.AggressiveInlining)] + private static ulong Xxh3Mix2Accs(Span<ulong> acc, ReadOnlySpan<byte> secret) + { + return Mul128Fold64( + acc[0] ^ BinaryPrimitives.ReadUInt64LittleEndian(secret), + acc[1] ^ BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(8))); + } + + [MethodImpl(MethodImplOptions.AggressiveInlining)] + private static ulong Xxh3MergeAccs(Span<ulong> acc, ReadOnlySpan<byte> secret, ulong start) + { + ulong result64 = start; + + for (int i = 0; i < 4; i++) + { + result64 += Xxh3Mix2Accs(acc.Slice(2 * i), secret.Slice(16 * i)); + } + + return Xxh3Avalanche(result64); + } + + [SkipLocalsInit] + private static Hash128 Xxh3HashLong128bInternal(ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret) + { + Span<ulong> acc = stackalloc ulong[AccNb]; + Xxh3InitAcc.CopyTo(acc); + + Xxh3HashLongInternalLoop(acc, input, secret); + + Debug.Assert(acc.Length == 8); + Debug.Assert(secret.Length >= acc.Length * sizeof(ulong) + SecretMergeAccsStart); + + return new Hash128 + { + Low = Xxh3MergeAccs(acc, secret.Slice(SecretMergeAccsStart), (ulong)input.Length * Prime64_1), + High = Xxh3MergeAccs( + acc, + secret.Slice(secret.Length - acc.Length * sizeof(ulong) - SecretMergeAccsStart), + ~((ulong)input.Length * Prime64_2)) + }; + } + + private static Hash128 Xxh3Len1To3128b(ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret, ulong seed) + { + Debug.Assert(1 <= input.Length && input.Length <= 3); + + byte c1 = input[0]; + byte c2 = input[input.Length >> 1]; + byte c3 = input[^1]; + + uint combinedL = ((uint)c1 << 16) | ((uint)c2 << 24) | c3 | ((uint)input.Length << 8); + uint combinedH = BitOperations.RotateLeft(BinaryPrimitives.ReverseEndianness(combinedL), 13); + ulong bitFlipL = (BinaryPrimitives.ReadUInt32LittleEndian(secret) ^ BinaryPrimitives.ReadUInt32LittleEndian(secret.Slice(4))) + seed; + ulong bitFlipH = (BinaryPrimitives.ReadUInt32LittleEndian(secret.Slice(8)) ^ BinaryPrimitives.ReadUInt32LittleEndian(secret.Slice(12))) - seed; + ulong keyedLo = combinedL ^ bitFlipL; + ulong keyedHi = combinedH ^ bitFlipH; + + return new Hash128 + { + Low = Xxh64Avalanche(keyedLo), + High = Xxh64Avalanche(keyedHi) + }; + } + + private static Hash128 Xxh3Len4To8128b(ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret, ulong seed) + { + Debug.Assert(4 <= input.Length && input.Length <= 8); + + seed ^= BinaryPrimitives.ReverseEndianness((uint)seed) << 32; + + uint inputLo = BinaryPrimitives.ReadUInt32LittleEndian(input); + uint inputHi = BinaryPrimitives.ReadUInt32LittleEndian(input.Slice(input.Length - 4)); + ulong input64 = inputLo + ((ulong)inputHi << 32); + ulong bitFlip = (BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(16)) ^ BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(24))) + seed; + ulong keyed = input64 ^ bitFlip; + + Hash128 m128 = Mult64To128(keyed, Prime64_1 + ((ulong)input.Length << 2)); + + m128.High += m128.Low << 1; + m128.Low ^= m128.High >> 3; + + m128.Low = XorShift64(m128.Low, 35); + m128.Low *= 0x9FB21C651E98DF25UL; + m128.Low = XorShift64(m128.Low, 28); + m128.High = Xxh3Avalanche(m128.High); + return m128; + } + + private static Hash128 Xxh3Len9To16128b(ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret, ulong seed) + { + Debug.Assert(9 <= input.Length && input.Length <= 16); + + ulong bitFlipL = (BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(32)) ^ BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(40))) - seed; + ulong bitFlipH = (BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(48)) ^ BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(56))) + seed; + ulong inputLo = BinaryPrimitives.ReadUInt64LittleEndian(input); + ulong inputHi = BinaryPrimitives.ReadUInt64LittleEndian(input.Slice(input.Length - 8)); + + Hash128 m128 = Mult64To128(inputLo ^ inputHi ^ bitFlipL, Prime64_1); + m128.Low += ((ulong)input.Length - 1) << 54; + inputHi ^= bitFlipH; + m128.High += inputHi + Mult32To64((uint)inputHi, Prime32_2 - 1); + m128.Low ^= BinaryPrimitives.ReverseEndianness(m128.High); + + Hash128 h128 = Mult64To128(m128.Low, Prime64_2); + h128.High += m128.High * Prime64_2; + h128.Low = Xxh3Avalanche(h128.Low); + h128.High = Xxh3Avalanche(h128.High); + return h128; + } + + private static Hash128 Xxh3Len0To16128b(ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret, ulong seed) + { + Debug.Assert(input.Length <= 16); + + if (input.Length > 8) + { + return Xxh3Len9To16128b(input, secret, seed); + } + else if (input.Length >= 4) + { + return Xxh3Len4To8128b(input, secret, seed); + } + else if (input.Length != 0) + { + return Xxh3Len1To3128b(input, secret, seed); + } + else + { + Hash128 h128 = new Hash128(); + ulong bitFlipL = BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(64)) ^ BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(72)); + ulong bitFlipH = BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(80)) ^ BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(88)); + h128.Low = Xxh64Avalanche(seed ^ bitFlipL); + h128.High = Xxh64Avalanche(seed ^ bitFlipH); + return h128; + } + } + + private static ulong Xxh3Mix16b(ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret, ulong seed) + { + ulong inputLo = BinaryPrimitives.ReadUInt64LittleEndian(input); + ulong inputHi = BinaryPrimitives.ReadUInt64LittleEndian(input.Slice(8)); + return Mul128Fold64( + inputLo ^ (BinaryPrimitives.ReadUInt64LittleEndian(secret) + seed), + inputHi ^ (BinaryPrimitives.ReadUInt64LittleEndian(secret.Slice(8)) - seed)); + } + + private static Hash128 Xxh128Mix32b(Hash128 acc, ReadOnlySpan<byte> input, ReadOnlySpan<byte> input2, ReadOnlySpan<byte> secret, ulong seed) + { + acc.Low += Xxh3Mix16b(input, secret, seed); + acc.Low ^= BinaryPrimitives.ReadUInt64LittleEndian(input2) + BinaryPrimitives.ReadUInt64LittleEndian(input2.Slice(8)); + acc.High += Xxh3Mix16b(input2, secret.Slice(16), seed); + acc.High ^= BinaryPrimitives.ReadUInt64LittleEndian(input) + BinaryPrimitives.ReadUInt64LittleEndian(input.Slice(8)); + return acc; + } + + private static Hash128 Xxh3Len17To128128b(ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret, ulong seed) + { + Debug.Assert(secret.Length >= SecretSizeMin); + Debug.Assert(16 < input.Length && input.Length <= 128); + + Hash128 acc = new Hash128 + { + Low = (ulong)input.Length * Prime64_1, + High = 0 + }; + + if (input.Length > 32) + { + if (input.Length > 64) + { + if (input.Length > 96) + { + acc = Xxh128Mix32b(acc, input.Slice(48), input.Slice(input.Length - 64), secret.Slice(96), seed); + } + acc = Xxh128Mix32b(acc, input.Slice(32), input.Slice(input.Length - 48), secret.Slice(64), seed); + } + acc = Xxh128Mix32b(acc, input.Slice(16), input.Slice(input.Length - 32), secret.Slice(32), seed); + } + acc = Xxh128Mix32b(acc, input, input.Slice(input.Length - 16), secret, seed); + + Hash128 h128 = new Hash128 + { + Low = acc.Low + acc.High, + High = acc.Low * Prime64_1 + acc.High * Prime64_4 + ((ulong)input.Length - seed) * Prime64_2 + }; + h128.Low = Xxh3Avalanche(h128.Low); + h128.High = 0UL - Xxh3Avalanche(h128.High); + return h128; + } + + private static Hash128 Xxh3Len129To240128b(ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret, ulong seed) + { + Debug.Assert(secret.Length >= SecretSizeMin); + Debug.Assert(128 < input.Length && input.Length <= 240); + + Hash128 acc = new Hash128(); + + int nbRounds = input.Length / 32; + acc.Low = (ulong)input.Length * Prime64_1; + acc.High = 0; + + for (int i = 0; i < 4; i++) + { + acc = Xxh128Mix32b(acc, input.Slice(32 * i), input.Slice(32 * i + 16), secret.Slice(32 * i), seed); + } + + acc.Low = Xxh3Avalanche(acc.Low); + acc.High = Xxh3Avalanche(acc.High); + Debug.Assert(nbRounds >= 4); + + for (int i = 4; i < nbRounds; i++) + { + acc = Xxh128Mix32b(acc, input.Slice(32 * i), input.Slice(32 * i + 16), secret.Slice(MidSizeStartOffset + 32 * (i - 4)), seed); + } + + acc = Xxh128Mix32b(acc, input.Slice(input.Length - 16), input.Slice(input.Length - 32), secret.Slice(SecretSizeMin - MidSizeLastOffset - 16), 0UL - seed); + + Hash128 h128 = new Hash128 + { + Low = acc.Low + acc.High, + High = acc.Low * Prime64_1 + acc.High * Prime64_4 + ((ulong)input.Length - seed) * Prime64_2 + }; + h128.Low = Xxh3Avalanche(h128.Low); + h128.High = 0UL - Xxh3Avalanche(h128.High); + return h128; + } + + private static Hash128 Xxh3128bitsInternal(ReadOnlySpan<byte> input, ReadOnlySpan<byte> secret, ulong seed) + { + Debug.Assert(secret.Length >= SecretSizeMin); + + if (input.Length <= 16) + { + return Xxh3Len0To16128b(input, secret, seed); + } + else if (input.Length <= 128) + { + return Xxh3Len17To128128b(input, secret, seed); + } + else if (input.Length <= 240) + { + return Xxh3Len129To240128b(input, secret, seed); + } + else + { + return Xxh3HashLong128bInternal(input, secret); + } + } + + public static Hash128 ComputeHash(ReadOnlySpan<byte> input) + { + return Xxh3128bitsInternal(input, Xxh3KSecret, 0UL); + } + } +} |