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| author | Peter Dettman <peter.dettman@bouncycastle.org> | 2022-07-19 00:42:58 +0700 |
|---|---|---|
| committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2022-07-19 00:42:58 +0700 |
| commit | b966a4c7e871e8a1bdf50c29626ce40450c3db0c (patch) | |
| tree | ec7ebe55384a5f92233977dc01e0c541a04af581 /crypto/src/util/Longs.cs | |
| parent | Factor out Unshuffle methods (diff) | |
| download | BouncyCastle.NET-ed25519-b966a4c7e871e8a1bdf50c29626ce40450c3db0c.tar.xz | |
Use intrinsics in several places
Diffstat (limited to 'crypto/src/util/Longs.cs')
| -rw-r--r-- | crypto/src/util/Longs.cs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/crypto/src/util/Longs.cs b/crypto/src/util/Longs.cs index e6ff2ea39..ff45a8143 100644 --- a/crypto/src/util/Longs.cs +++ b/crypto/src/util/Longs.cs @@ -1,4 +1,7 @@ using System; +#if NET5_0_OR_GREATER +using System.Runtime.Intrinsics.X86; +#endif using Org.BouncyCastle.Math.Raw; @@ -45,6 +48,13 @@ namespace Org.BouncyCastle.Utilities public static int NumberOfLeadingZeros(long i) { +#if NET5_0_OR_GREATER + if (Lzcnt.X64.IsSupported) + { + return (int)Lzcnt.X64.LeadingZeroCount((ulong)i); + } +#endif + int x = (int)(i >> 32), n = 0; if (x == 0) { @@ -56,6 +66,13 @@ namespace Org.BouncyCastle.Utilities public static int NumberOfTrailingZeros(long i) { +#if NET5_0_OR_GREATER + if (Bmi1.X64.IsSupported) + { + return (int)Bmi1.X64.TrailingZeroCount((ulong)i); + } +#endif + int n = DeBruijnTZ[(uint)((ulong)((i & -i) * 0x045FBAC7992A70DAL) >> 58)]; long m = (((i & 0xFFFFFFFFL) | (long)((ulong)i >> 32)) - 1L) >> 63; return n - (int)m; |