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using System;
namespace Ryujinx.Cpu.LightningJit.Arm32
{
static class RegisterUtils
{
public const int SpRegister = 13;
public const int LrRegister = 14;
public const int PcRegister = 15;
private const int RmBit = 0;
private const int RdRtBit = 12;
private const int RdHiRnBit = 16;
private const int RdRtT16Bit = 16;
private const int RdRtT16AltBit = 24;
private const int RdRt2RdHiT32Bit = 8;
private const int RdT32AltBit = 0;
private const int RtRdLoT32Bit = 12;
public static int ExtractRt(uint encoding)
{
return (int)(encoding >> RdRtBit) & 0xf;
}
public static int ExtractRt2(uint encoding)
{
return (int)GetRt2((uint)ExtractRt(encoding));
}
public static int ExtractRd(InstFlags flags, uint encoding)
{
return flags.HasFlag(InstFlags.Rd16) ? ExtractRn(encoding) : ExtractRd(encoding);
}
public static int ExtractRd(uint encoding)
{
return (int)(encoding >> RdRtBit) & 0xf;
}
public static int ExtractRdHi(uint encoding)
{
return (int)(encoding >> RdHiRnBit) & 0xf;
}
public static int ExtractRn(uint encoding)
{
return (int)(encoding >> RdHiRnBit) & 0xf;
}
public static int ExtractRm(uint encoding)
{
return (int)(encoding >> RmBit) & 0xf;
}
public static uint GetRt2(uint rt)
{
return Math.Min(rt + 1, PcRegister);
}
public static int ExtractRdn(InstFlags flags, uint encoding)
{
if (flags.HasFlag(InstFlags.Dn))
{
return ((int)(encoding >> RdRtT16Bit) & 7) | (int)((encoding >> 4) & 8);
}
else
{
return ExtractRdT16(flags, encoding);
}
}
public static int ExtractRdT16(InstFlags flags, uint encoding)
{
return flags.HasFlag(InstFlags.Rd16) ? (int)(encoding >> RdRtT16AltBit) & 7 : (int)(encoding >> RdRtT16Bit) & 7;
}
public static int ExtractRtT16(InstFlags flags, uint encoding)
{
return flags.HasFlag(InstFlags.Rd16) ? (int)(encoding >> RdRtT16AltBit) & 7 : (int)(encoding >> RdRtT16Bit) & 7;
}
public static int ExtractRdT32(InstFlags flags, uint encoding)
{
return flags.HasFlag(InstFlags.Rd16) ? (int)(encoding >> RdT32AltBit) & 0xf : (int)(encoding >> RdRt2RdHiT32Bit) & 0xf;
}
public static int ExtractRdLoT32(uint encoding)
{
return (int)(encoding >> RtRdLoT32Bit) & 0xf;
}
public static int ExtractRdHiT32(uint encoding)
{
return (int)(encoding >> RdRt2RdHiT32Bit) & 0xf;
}
public static int ExtractRtT32(uint encoding)
{
return (int)(encoding >> RtRdLoT32Bit) & 0xf;
}
public static int ExtractRt2T32(uint encoding)
{
return (int)(encoding >> RdRt2RdHiT32Bit) & 0xf;
}
}
}
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