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|
using ARMeilleure.State;
using System;
namespace ARMeilleure.Instructions
{
static class SoftFallback
{
#region "ShrImm64"
public static long SignedShrImm64(long value, long roundConst, int shift)
{
if (roundConst == 0L)
{
if (shift <= 63)
{
return value >> shift;
}
else /* if (shift == 64) */
{
if (value < 0L)
{
return -1L;
}
else /* if (value >= 0L) */
{
return 0L;
}
}
}
else /* if (roundConst == 1L << (shift - 1)) */
{
if (shift <= 63)
{
long add = value + roundConst;
if ((~value & (value ^ add)) < 0L)
{
return (long)((ulong)add >> shift);
}
else
{
return add >> shift;
}
}
else /* if (shift == 64) */
{
return 0L;
}
}
}
public static ulong UnsignedShrImm64(ulong value, long roundConst, int shift)
{
if (roundConst == 0L)
{
if (shift <= 63)
{
return value >> shift;
}
else /* if (shift == 64) */
{
return 0UL;
}
}
else /* if (roundConst == 1L << (shift - 1)) */
{
ulong add = value + (ulong)roundConst;
if ((add < value) && (add < (ulong)roundConst))
{
if (shift <= 63)
{
return (add >> shift) | (0x8000000000000000UL >> (shift - 1));
}
else /* if (shift == 64) */
{
return 1UL;
}
}
else
{
if (shift <= 63)
{
return add >> shift;
}
else /* if (shift == 64) */
{
return 0UL;
}
}
}
}
#endregion
#region "Rounding"
public static double Round(double value)
{
ExecutionContext context = NativeInterface.GetContext();
FPRoundingMode roundMode = context.Fpcr.GetRoundingMode();
if (roundMode == FPRoundingMode.ToNearest)
{
return Math.Round(value); // even
}
else if (roundMode == FPRoundingMode.TowardsPlusInfinity)
{
return Math.Ceiling(value);
}
else if (roundMode == FPRoundingMode.TowardsMinusInfinity)
{
return Math.Floor(value);
}
else /* if (roundMode == FPRoundingMode.TowardsZero) */
{
return Math.Truncate(value);
}
}
public static float RoundF(float value)
{
ExecutionContext context = NativeInterface.GetContext();
FPRoundingMode roundMode = context.Fpcr.GetRoundingMode();
if (roundMode == FPRoundingMode.ToNearest)
{
return MathF.Round(value); // even
}
else if (roundMode == FPRoundingMode.TowardsPlusInfinity)
{
return MathF.Ceiling(value);
}
else if (roundMode == FPRoundingMode.TowardsMinusInfinity)
{
return MathF.Floor(value);
}
else /* if (roundMode == FPRoundingMode.TowardsZero) */
{
return MathF.Truncate(value);
}
}
public static int FloatToInt32(float value)
{
return SatF32ToS32(RoundF(value));
}
public static int DoubleToInt32(double value)
{
return SatF64ToS32(Round(value));
}
public static uint FloatToUInt32(float value)
{
return SatF32ToU32(RoundF(value));
}
public static uint DoubleToUInt32(double value)
{
return SatF64ToU32(Round(value));
}
#endregion
#region "Saturation"
public static int SatF32ToS32(float value)
{
if (float.IsNaN(value)) return 0;
return value >= int.MaxValue ? int.MaxValue :
value <= int.MinValue ? int.MinValue : (int)value;
}
public static long SatF32ToS64(float value)
{
if (float.IsNaN(value)) return 0;
return value >= long.MaxValue ? long.MaxValue :
value <= long.MinValue ? long.MinValue : (long)value;
}
public static uint SatF32ToU32(float value)
{
if (float.IsNaN(value)) return 0;
return value >= uint.MaxValue ? uint.MaxValue :
value <= uint.MinValue ? uint.MinValue : (uint)value;
}
public static ulong SatF32ToU64(float value)
{
if (float.IsNaN(value)) return 0;
return value >= ulong.MaxValue ? ulong.MaxValue :
value <= ulong.MinValue ? ulong.MinValue : (ulong)value;
}
public static int SatF64ToS32(double value)
{
if (double.IsNaN(value)) return 0;
return value >= int.MaxValue ? int.MaxValue :
value <= int.MinValue ? int.MinValue : (int)value;
}
public static long SatF64ToS64(double value)
{
if (double.IsNaN(value)) return 0;
return value >= long.MaxValue ? long.MaxValue :
value <= long.MinValue ? long.MinValue : (long)value;
}
public static uint SatF64ToU32(double value)
{
if (double.IsNaN(value)) return 0;
return value >= uint.MaxValue ? uint.MaxValue :
value <= uint.MinValue ? uint.MinValue : (uint)value;
}
public static ulong SatF64ToU64(double value)
{
if (double.IsNaN(value)) return 0;
return value >= ulong.MaxValue ? ulong.MaxValue :
value <= ulong.MinValue ? ulong.MinValue : (ulong)value;
}
#endregion
#region "Count"
public static ulong CountLeadingSigns(ulong value, int size) // size is 8, 16, 32 or 64 (SIMD&FP or Base Inst.).
{
value ^= value >> 1;
int highBit = size - 2;
for (int bit = highBit; bit >= 0; bit--)
{
if (((int)(value >> bit) & 0b1) != 0)
{
return (ulong)(highBit - bit);
}
}
return (ulong)(size - 1);
}
private static ReadOnlySpan<byte> ClzNibbleTbl => new byte[] { 4, 3, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0 };
public static ulong CountLeadingZeros(ulong value, int size) // size is 8, 16, 32 or 64 (SIMD&FP or Base Inst.).
{
if (value == 0ul)
{
return (ulong)size;
}
int nibbleIdx = size;
int preCount, count = 0;
do
{
nibbleIdx -= 4;
preCount = ClzNibbleTbl[(int)(value >> nibbleIdx) & 0b1111];
count += preCount;
}
while (preCount == 4);
return (ulong)count;
}
#endregion
#region "Table"
public static V128 Tbl1(V128 vector, int bytes, V128 tb0)
{
return TblOrTbx(default, vector, bytes, tb0);
}
public static V128 Tbl2(V128 vector, int bytes, V128 tb0, V128 tb1)
{
return TblOrTbx(default, vector, bytes, tb0, tb1);
}
public static V128 Tbl3(V128 vector, int bytes, V128 tb0, V128 tb1, V128 tb2)
{
return TblOrTbx(default, vector, bytes, tb0, tb1, tb2);
}
public static V128 Tbl4(V128 vector, int bytes, V128 tb0, V128 tb1, V128 tb2, V128 tb3)
{
return TblOrTbx(default, vector, bytes, tb0, tb1, tb2, tb3);
}
public static V128 Tbx1(V128 dest, V128 vector, int bytes, V128 tb0)
{
return TblOrTbx(dest, vector, bytes, tb0);
}
public static V128 Tbx2(V128 dest, V128 vector, int bytes, V128 tb0, V128 tb1)
{
return TblOrTbx(dest, vector, bytes, tb0, tb1);
}
public static V128 Tbx3(V128 dest, V128 vector, int bytes, V128 tb0, V128 tb1, V128 tb2)
{
return TblOrTbx(dest, vector, bytes, tb0, tb1, tb2);
}
public static V128 Tbx4(V128 dest, V128 vector, int bytes, V128 tb0, V128 tb1, V128 tb2, V128 tb3)
{
return TblOrTbx(dest, vector, bytes, tb0, tb1, tb2, tb3);
}
private static V128 TblOrTbx(V128 dest, V128 vector, int bytes, params V128[] tb)
{
byte[] res = new byte[16];
if (dest != default)
{
Buffer.BlockCopy(dest.ToArray(), 0, res, 0, bytes);
}
byte[] table = new byte[tb.Length * 16];
for (byte index = 0; index < tb.Length; index++)
{
Buffer.BlockCopy(tb[index].ToArray(), 0, table, index * 16, 16);
}
byte[] v = vector.ToArray();
for (byte index = 0; index < bytes; index++)
{
byte tblIndex = v[index];
if (tblIndex < table.Length)
{
res[index] = table[tblIndex];
}
}
return new V128(res);
}
#endregion
#region "Crc32"
private const uint Crc32RevPoly = 0xedb88320;
private const uint Crc32cRevPoly = 0x82f63b78;
public static uint Crc32b(uint crc, byte value) => Crc32 (crc, Crc32RevPoly, value);
public static uint Crc32h(uint crc, ushort value) => Crc32h(crc, Crc32RevPoly, value);
public static uint Crc32w(uint crc, uint value) => Crc32w(crc, Crc32RevPoly, value);
public static uint Crc32x(uint crc, ulong value) => Crc32x(crc, Crc32RevPoly, value);
public static uint Crc32cb(uint crc, byte value) => Crc32 (crc, Crc32cRevPoly, value);
public static uint Crc32ch(uint crc, ushort value) => Crc32h(crc, Crc32cRevPoly, value);
public static uint Crc32cw(uint crc, uint value) => Crc32w(crc, Crc32cRevPoly, value);
public static uint Crc32cx(uint crc, ulong value) => Crc32x(crc, Crc32cRevPoly, value);
private static uint Crc32h(uint crc, uint poly, ushort val)
{
crc = Crc32(crc, poly, (byte)(val >> 0));
crc = Crc32(crc, poly, (byte)(val >> 8));
return crc;
}
private static uint Crc32w(uint crc, uint poly, uint val)
{
crc = Crc32(crc, poly, (byte)(val >> 0));
crc = Crc32(crc, poly, (byte)(val >> 8));
crc = Crc32(crc, poly, (byte)(val >> 16));
crc = Crc32(crc, poly, (byte)(val >> 24));
return crc;
}
private static uint Crc32x(uint crc, uint poly, ulong val)
{
crc = Crc32(crc, poly, (byte)(val >> 0));
crc = Crc32(crc, poly, (byte)(val >> 8));
crc = Crc32(crc, poly, (byte)(val >> 16));
crc = Crc32(crc, poly, (byte)(val >> 24));
crc = Crc32(crc, poly, (byte)(val >> 32));
crc = Crc32(crc, poly, (byte)(val >> 40));
crc = Crc32(crc, poly, (byte)(val >> 48));
crc = Crc32(crc, poly, (byte)(val >> 56));
return crc;
}
private static uint Crc32(uint crc, uint poly, byte val)
{
crc ^= val;
for (int bit = 7; bit >= 0; bit--)
{
uint mask = (uint)(-(int)(crc & 1));
crc = (crc >> 1) ^ (poly & mask);
}
return crc;
}
#endregion
#region "Aes"
public static V128 Decrypt(V128 value, V128 roundKey)
{
return CryptoHelper.AesInvSubBytes(CryptoHelper.AesInvShiftRows(value ^ roundKey));
}
public static V128 Encrypt(V128 value, V128 roundKey)
{
return CryptoHelper.AesSubBytes(CryptoHelper.AesShiftRows(value ^ roundKey));
}
public static V128 InverseMixColumns(V128 value)
{
return CryptoHelper.AesInvMixColumns(value);
}
public static V128 MixColumns(V128 value)
{
return CryptoHelper.AesMixColumns(value);
}
#endregion
#region "Sha1"
public static V128 HashChoose(V128 hash_abcd, uint hash_e, V128 wk)
{
for (int e = 0; e <= 3; e++)
{
uint t = ShaChoose(hash_abcd.Extract<uint>(1),
hash_abcd.Extract<uint>(2),
hash_abcd.Extract<uint>(3));
hash_e += Rol(hash_abcd.Extract<uint>(0), 5) + t + wk.Extract<uint>(e);
t = Rol(hash_abcd.Extract<uint>(1), 30);
hash_abcd.Insert(1, t);
Rol32_160(ref hash_e, ref hash_abcd);
}
return hash_abcd;
}
public static uint FixedRotate(uint hash_e)
{
return hash_e.Rol(30);
}
public static V128 HashMajority(V128 hash_abcd, uint hash_e, V128 wk)
{
for (int e = 0; e <= 3; e++)
{
uint t = ShaMajority(hash_abcd.Extract<uint>(1),
hash_abcd.Extract<uint>(2),
hash_abcd.Extract<uint>(3));
hash_e += Rol(hash_abcd.Extract<uint>(0), 5) + t + wk.Extract<uint>(e);
t = Rol(hash_abcd.Extract<uint>(1), 30);
hash_abcd.Insert(1, t);
Rol32_160(ref hash_e, ref hash_abcd);
}
return hash_abcd;
}
public static V128 HashParity(V128 hash_abcd, uint hash_e, V128 wk)
{
for (int e = 0; e <= 3; e++)
{
uint t = ShaParity(hash_abcd.Extract<uint>(1),
hash_abcd.Extract<uint>(2),
hash_abcd.Extract<uint>(3));
hash_e += Rol(hash_abcd.Extract<uint>(0), 5) + t + wk.Extract<uint>(e);
t = Rol(hash_abcd.Extract<uint>(1), 30);
hash_abcd.Insert(1, t);
Rol32_160(ref hash_e, ref hash_abcd);
}
return hash_abcd;
}
public static V128 Sha1SchedulePart1(V128 w0_3, V128 w4_7, V128 w8_11)
{
ulong t2 = w4_7.Extract<ulong>(0);
ulong t1 = w0_3.Extract<ulong>(1);
V128 result = new V128(t1, t2);
return result ^ (w0_3 ^ w8_11);
}
public static V128 Sha1SchedulePart2(V128 tw0_3, V128 w12_15)
{
V128 t = tw0_3 ^ (w12_15 >> 32);
uint tE0 = t.Extract<uint>(0);
uint tE1 = t.Extract<uint>(1);
uint tE2 = t.Extract<uint>(2);
uint tE3 = t.Extract<uint>(3);
return new V128(tE0.Rol(1), tE1.Rol(1), tE2.Rol(1), tE3.Rol(1) ^ tE0.Rol(2));
}
private static void Rol32_160(ref uint y, ref V128 x)
{
uint xE3 = x.Extract<uint>(3);
x <<= 32;
x.Insert(0, y);
y = xE3;
}
private static uint ShaChoose(uint x, uint y, uint z)
{
return ((y ^ z) & x) ^ z;
}
private static uint ShaMajority(uint x, uint y, uint z)
{
return (x & y) | ((x | y) & z);
}
private static uint ShaParity(uint x, uint y, uint z)
{
return x ^ y ^ z;
}
private static uint Rol(this uint value, int count)
{
return (value << count) | (value >> (32 - count));
}
#endregion
#region "Sha256"
public static V128 HashLower(V128 hash_abcd, V128 hash_efgh, V128 wk)
{
return Sha256Hash(hash_abcd, hash_efgh, wk, part1: true);
}
public static V128 HashUpper(V128 hash_abcd, V128 hash_efgh, V128 wk)
{
return Sha256Hash(hash_abcd, hash_efgh, wk, part1: false);
}
public static V128 Sha256SchedulePart1(V128 w0_3, V128 w4_7)
{
V128 result = new V128();
for (int e = 0; e <= 3; e++)
{
uint elt = (e <= 2 ? w0_3 : w4_7).Extract<uint>(e <= 2 ? e + 1 : 0);
elt = elt.Ror(7) ^ elt.Ror(18) ^ elt.Lsr(3);
elt += w0_3.Extract<uint>(e);
result.Insert(e, elt);
}
return result;
}
public static V128 Sha256SchedulePart2(V128 w0_3, V128 w8_11, V128 w12_15)
{
V128 result = new V128();
ulong t1 = w12_15.Extract<ulong>(1);
for (int e = 0; e <= 1; e++)
{
uint elt = t1.ULongPart(e);
elt = elt.Ror(17) ^ elt.Ror(19) ^ elt.Lsr(10);
elt += w0_3.Extract<uint>(e) + w8_11.Extract<uint>(e + 1);
result.Insert(e, elt);
}
t1 = result.Extract<ulong>(0);
for (int e = 2; e <= 3; e++)
{
uint elt = t1.ULongPart(e - 2);
elt = elt.Ror(17) ^ elt.Ror(19) ^ elt.Lsr(10);
elt += w0_3.Extract<uint>(e) + (e == 2 ? w8_11 : w12_15).Extract<uint>(e == 2 ? 3 : 0);
result.Insert(e, elt);
}
return result;
}
private static V128 Sha256Hash(V128 x, V128 y, V128 w, bool part1)
{
for (int e = 0; e <= 3; e++)
{
uint chs = ShaChoose(y.Extract<uint>(0),
y.Extract<uint>(1),
y.Extract<uint>(2));
uint maj = ShaMajority(x.Extract<uint>(0),
x.Extract<uint>(1),
x.Extract<uint>(2));
uint t1 = y.Extract<uint>(3) + ShaHashSigma1(y.Extract<uint>(0)) + chs + w.Extract<uint>(e);
uint t2 = t1 + x.Extract<uint>(3);
x.Insert(3, t2);
t2 = t1 + ShaHashSigma0(x.Extract<uint>(0)) + maj;
y.Insert(3, t2);
Rol32_256(ref y, ref x);
}
return part1 ? x : y;
}
private static void Rol32_256(ref V128 y, ref V128 x)
{
uint yE3 = y.Extract<uint>(3);
uint xE3 = x.Extract<uint>(3);
y <<= 32;
x <<= 32;
y.Insert(0, xE3);
x.Insert(0, yE3);
}
private static uint ShaHashSigma0(uint x)
{
return x.Ror(2) ^ x.Ror(13) ^ x.Ror(22);
}
private static uint ShaHashSigma1(uint x)
{
return x.Ror(6) ^ x.Ror(11) ^ x.Ror(25);
}
private static uint Ror(this uint value, int count)
{
return (value >> count) | (value << (32 - count));
}
private static uint Lsr(this uint value, int count)
{
return value >> count;
}
private static uint ULongPart(this ulong value, int part)
{
return part == 0
? (uint)(value & 0xFFFFFFFFUL)
: (uint)(value >> 32);
}
#endregion
public static V128 PolynomialMult64_128(ulong op1, ulong op2)
{
V128 result = V128.Zero;
V128 op2_128 = new V128(op2, 0);
for (int i = 0; i < 64; i++)
{
if (((op1 >> i) & 1) == 1)
{
result ^= op2_128 << i;
}
}
return result;
}
}
}
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