38 lines
1.2 KiB
C#
38 lines
1.2 KiB
C#
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using ARMeilleure.Common;
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using System.Runtime.Intrinsics;
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namespace ARMeilleure.Decoders
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{
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class OpCodeT32AluImm : OpCodeT32Alu, IOpCode32AluImm
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{
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public int Immediate { get; }
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public bool IsRotated { get; }
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public new static OpCode Create(InstDescriptor inst, ulong address, int opCode) => new OpCodeT32AluImm(inst, address, opCode);
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private static readonly Vector128<int> _factor = Vector128.Create(1, 0x00010001, 0x01000100, 0x01010101);
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public OpCodeT32AluImm(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode)
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{
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int imm8 = (opCode >> 0) & 0xff;
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int imm3 = (opCode >> 12) & 7;
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int imm1 = (opCode >> 26) & 1;
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int imm12 = imm8 | (imm3 << 8) | (imm1 << 11);
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if ((imm12 >> 10) == 0)
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{
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Immediate = imm8 * _factor.GetElement((imm12 >> 8) & 3);
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IsRotated = false;
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}
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else
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{
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int shift = imm12 >> 7;
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Immediate = BitUtils.RotateRight(0x80 | (imm12 & 0x7f), shift, 32);
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IsRotated = shift != 0;
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}
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}
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}
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}
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