diff --git a/crypto/src/util/Integers.cs b/crypto/src/util/Integers.cs
index ab1868b74..eff7056b6 100644
--- a/crypto/src/util/Integers.cs
+++ b/crypto/src/util/Integers.cs
@@ -16,9 +16,11 @@ namespace Org.BouncyCastle.Utilities
public const int NumBits = 32;
public const int NumBytes = 4;
+#if !NETCOREAPP3_0_OR_GREATER
private static readonly byte[] DeBruijnTZ = {
0x1F, 0x00, 0x1B, 0x01, 0x1C, 0x0D, 0x17, 0x02, 0x1D, 0x15, 0x13, 0x0E, 0x18, 0x10, 0x03, 0x07,
0x1E, 0x1A, 0x0C, 0x16, 0x14, 0x12, 0x0F, 0x06, 0x19, 0x0B, 0x11, 0x05, 0x0A, 0x04, 0x09, 0x08 };
+#endif
public static int HighestOneBit(int i)
{
@@ -50,12 +52,8 @@ namespace Org.BouncyCastle.Utilities
public static int NumberOfLeadingZeros(int i)
{
#if NETCOREAPP3_0_OR_GREATER
- if (Lzcnt.IsSupported)
- {
- return (int)Lzcnt.LeadingZeroCount((uint)i);
- }
-#endif
-
+ return BitOperations.LeadingZeroCount((uint)i);
+#else
if (i <= 0)
return (~i >> (31 - 5)) & (1 << 5);
@@ -67,20 +65,18 @@ namespace Org.BouncyCastle.Utilities
if (0 == (u >> 30)) { n += 2; u <<= 2; }
n -= (int)(u >> 31);
return n;
+#endif
}
public static int NumberOfTrailingZeros(int i)
{
#if NETCOREAPP3_0_OR_GREATER
- if (Bmi1.IsSupported)
- {
- return (int)Bmi1.TrailingZeroCount((uint)i);
- }
-#endif
-
+ return BitOperations.TrailingZeroCount(i);
+#else
int n = DeBruijnTZ[(uint)((i & -i) * 0x0EF96A62) >> 27];
int m = (((i & 0xFFFF) | (int)((uint)i >> 16)) - 1) >> 31;
return n - m;
+#endif
}
public static int Reverse(int i)
diff --git a/crypto/src/util/Longs.cs b/crypto/src/util/Longs.cs
index 02ffb7676..18be945e9 100644
--- a/crypto/src/util/Longs.cs
+++ b/crypto/src/util/Longs.cs
@@ -16,11 +16,13 @@ namespace Org.BouncyCastle.Utilities
public const int NumBits = 64;
public const int NumBytes = 8;
+#if !NETCOREAPP3_0_OR_GREATER
private static readonly byte[] DeBruijnTZ = {
0x3F, 0x00, 0x01, 0x34, 0x02, 0x06, 0x35, 0x1A, 0x03, 0x25, 0x28, 0x07, 0x21, 0x36, 0x2F, 0x1B,
0x3D, 0x04, 0x26, 0x2D, 0x2B, 0x29, 0x15, 0x08, 0x17, 0x22, 0x3A, 0x37, 0x30, 0x11, 0x1C, 0x0A,
0x3E, 0x33, 0x05, 0x19, 0x24, 0x27, 0x20, 0x2E, 0x3C, 0x2C, 0x2A, 0x14, 0x16, 0x39, 0x10, 0x09,
0x32, 0x18, 0x23, 0x1F, 0x3B, 0x13, 0x38, 0x0F, 0x31, 0x1E, 0x12, 0x0E, 0x1D, 0x0D, 0x0C, 0x0B };
+#endif
public static long HighestOneBit(long i)
{
@@ -53,12 +55,8 @@ namespace Org.BouncyCastle.Utilities
public static int NumberOfLeadingZeros(long i)
{
#if NETCOREAPP3_0_OR_GREATER
- if (Lzcnt.X64.IsSupported)
- {
- return (int)Lzcnt.X64.LeadingZeroCount((ulong)i);
- }
-#endif
-
+ return BitOperations.LeadingZeroCount((ulong)i);
+#else
int x = (int)(i >> 32), n = 0;
if (x == 0)
{
@@ -66,20 +64,18 @@ namespace Org.BouncyCastle.Utilities
x = (int)i;
}
return n + Integers.NumberOfLeadingZeros(x);
+#endif
}
public static int NumberOfTrailingZeros(long i)
{
#if NETCOREAPP3_0_OR_GREATER
- if (Bmi1.X64.IsSupported)
- {
- return (int)Bmi1.X64.TrailingZeroCount((ulong)i);
- }
-#endif
-
+ return BitOperations.TrailingZeroCount((ulong)i);
+#else
int n = DeBruijnTZ[(uint)((ulong)((i & -i) * 0x045FBAC7992A70DAL) >> 58)];
long m = (((i & 0xFFFFFFFFL) | (long)((ulong)i >> 32)) - 1L) >> 63;
return n - (int)m;
+#endif
}
public static long Reverse(long i)
|
