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