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Ryujinx/Ryujinx.Common/Utilities/BitfieldExtensions.cs

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using System.Numerics;
using System.Runtime.CompilerServices;
namespace Ryujinx.Common.Utilities
{
public static class BitfieldExtensions
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool Extract<T>(this T value, int lsb) where T : IBinaryInteger<T>
{
int bitSize = Unsafe.SizeOf<T>() * 8;
lsb &= bitSize - 1;
return !T.IsZero((value >>> lsb) & T.One);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static T Extract<T>(this T value, int lsb, int length) where T : IBinaryInteger<T>
{
int bitSize = Unsafe.SizeOf<T>() * 8;
lsb &= bitSize - 1;
return (value >>> lsb) & (~T.Zero >>> (bitSize - length));
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static T ExtractSx<T>(this T value, int lsb, int length) where T : IBinaryInteger<T>
{
int bitSize = Unsafe.SizeOf<T>() * 8;
int shift = lsb & (bitSize - 1);
return (value << (bitSize - (shift + length))) >> (bitSize - length);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static T Insert<T>(this T value, int lsb, bool toInsert) where T : IBinaryInteger<T>
{
int bitSize = Unsafe.SizeOf<T>() * 8;
lsb &= bitSize - 1;
T mask = T.One << lsb;
return (value & ~mask) | (toInsert ? mask : T.Zero);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static T Insert<T>(this T value, int lsb, int length, T toInsert) where T : IBinaryInteger<T>
{
int bitSize = Unsafe.SizeOf<T>() * 8;
lsb &= bitSize - 1;
T mask = (~T.Zero >>> (bitSize - length)) << lsb;
return (value & ~mask) | ((toInsert << lsb) & mask);
}
}
}