diff options
Diffstat (limited to 'crypto/src/math/raw/Interleave.cs')
| -rw-r--r-- | crypto/src/math/raw/Interleave.cs | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/crypto/src/math/raw/Interleave.cs b/crypto/src/math/raw/Interleave.cs index 409ab83e8..560fd76fb 100644 --- a/crypto/src/math/raw/Interleave.cs +++ b/crypto/src/math/raw/Interleave.cs @@ -1,4 +1,7 @@ using System; +#if NET5_0_OR_GREATER +using System.Runtime.Intrinsics.X86; +#endif namespace Org.BouncyCastle.Math.Raw { @@ -29,6 +32,14 @@ namespace Org.BouncyCastle.Math.Raw internal static ulong Expand32to64(uint x) { +#if NET5_0_OR_GREATER + if (Bmi2.IsSupported) + { + return (ulong)Bmi2.ParallelBitDeposit(x >> 16, 0x55555555U) << 32 + | Bmi2.ParallelBitDeposit(x , 0x55555555U); + } +#endif + // "shuffle" low half to even bits and high half to odd bits x = Bits.BitPermuteStep(x, 0x0000FF00U, 8); x = Bits.BitPermuteStep(x, 0x00F000F0U, 4); @@ -40,6 +51,15 @@ namespace Org.BouncyCastle.Math.Raw internal static void Expand64To128(ulong x, ulong[] z, int zOff) { +#if NET5_0_OR_GREATER + if (Bmi2.X64.IsSupported) + { + z[zOff ] = Bmi2.X64.ParallelBitDeposit(x , 0x5555555555555555UL); + z[zOff + 1] = Bmi2.X64.ParallelBitDeposit(x >> 32, 0x5555555555555555UL); + return; + } +#endif + // "shuffle" low half to even bits and high half to odd bits x = Bits.BitPermuteStep(x, 0x00000000FFFF0000UL, 16); x = Bits.BitPermuteStep(x, 0x0000FF000000FF00UL, 8); @@ -72,6 +92,15 @@ namespace Org.BouncyCastle.Math.Raw internal static void Expand64To128Rev(ulong x, ulong[] z, int zOff) { +#if NET5_0_OR_GREATER + if (Bmi2.X64.IsSupported) + { + z[zOff ] = Bmi2.X64.ParallelBitDeposit(x >> 32, 0xAAAAAAAAAAAAAAAAUL); + z[zOff + 1] = Bmi2.X64.ParallelBitDeposit(x , 0xAAAAAAAAAAAAAAAAUL); + return; + } +#endif + // "shuffle" low half to even bits and high half to odd bits x = Bits.BitPermuteStep(x, 0x00000000FFFF0000UL, 16); x = Bits.BitPermuteStep(x, 0x0000FF000000FF00UL, 8); @@ -126,6 +155,14 @@ namespace Org.BouncyCastle.Math.Raw internal static ulong Unshuffle(ulong x) { +#if NET5_0_OR_GREATER + if (Bmi2.X64.IsSupported) + { + return Bmi2.X64.ParallelBitExtract(x, 0xAAAAAAAAAAAAAAAAUL) << 32 + | Bmi2.X64.ParallelBitExtract(x, 0x5555555555555555UL); + } +#endif + // "unshuffle" even bits to low half and odd bits to high half x = Bits.BitPermuteStep(x, 0x2222222222222222UL, 1); x = Bits.BitPermuteStep(x, 0x0C0C0C0C0C0C0C0CUL, 2); @@ -137,6 +174,14 @@ namespace Org.BouncyCastle.Math.Raw internal static ulong Unshuffle(ulong x, out ulong even) { +#if NET5_0_OR_GREATER + if (Bmi2.X64.IsSupported) + { + even = Bmi2.X64.ParallelBitExtract(x, 0x5555555555555555UL); + return Bmi2.X64.ParallelBitExtract(x, 0xAAAAAAAAAAAAAAAAUL); + } +#endif + ulong u0 = Unshuffle(x); even = u0 & 0x00000000FFFFFFFFUL; return u0 >> 32; @@ -144,6 +189,16 @@ namespace Org.BouncyCastle.Math.Raw internal static ulong Unshuffle(ulong x0, ulong x1, out ulong even) { +#if NET5_0_OR_GREATER + if (Bmi2.X64.IsSupported) + { + even = Bmi2.X64.ParallelBitExtract(x0, 0x5555555555555555UL) + | Bmi2.X64.ParallelBitExtract(x1, 0x5555555555555555UL) << 32; + return Bmi2.X64.ParallelBitExtract(x0, 0xAAAAAAAAAAAAAAAAUL) + | Bmi2.X64.ParallelBitExtract(x1, 0xAAAAAAAAAAAAAAAAUL) << 32; + } +#endif + ulong u0 = Unshuffle(x0); ulong u1 = Unshuffle(x1); even = (u1 << 32) | (u0 & 0x00000000FFFFFFFFUL); |