94 lines
2.9 KiB
C#
94 lines
2.9 KiB
C#
using ChocolArm64.Instruction;
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using ChocolArm64.State;
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namespace ChocolArm64.Decoder
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{
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class AOpCodeSimdImm : AOpCode, IAOpCodeSimd
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{
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public int Rd { get; private set; }
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public long Imm { get; private set; }
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public int Size { get; private set; }
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public AOpCodeSimdImm(AInst Inst, long Position, int OpCode) : base(Inst, Position)
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{
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Rd = OpCode & 0x1f;
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int CMode = (OpCode >> 12) & 0xf;
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int Op = (OpCode >> 29) & 0x1;
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int ModeLow = CMode & 1;
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int ModeHigh = CMode >> 1;
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long Imm;
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Imm = ((uint)OpCode >> 5) & 0x1f;
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Imm |= ((uint)OpCode >> 11) & 0xe0;
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if (ModeHigh == 0b111)
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{
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Size = ModeLow != 0 ? Op : 3;
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switch (Op | (ModeLow << 1))
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{
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case 0:
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//64-bits Immediate.
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//Transform abcd efgh into abcd efgh abcd efgh ...
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Imm = (long)((ulong)Imm * 0x0101010101010101);
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break;
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case 1:
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//64-bits Immediate.
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//Transform abcd efgh into aaaa aaaa bbbb bbbb ...
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Imm = (Imm & 0xf0) >> 4 | (Imm & 0x0f) << 4;
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Imm = (Imm & 0xcc) >> 2 | (Imm & 0x33) << 2;
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Imm = (Imm & 0xaa) >> 1 | (Imm & 0x55) << 1;
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Imm = (long)((ulong)Imm * 0x8040201008040201);
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Imm = (long)((ulong)Imm & 0x8080808080808080);
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Imm |= Imm >> 4;
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Imm |= Imm >> 2;
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Imm |= Imm >> 1;
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break;
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case 2:
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case 3:
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//Floating point Immediate.
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Imm = ADecoderHelper.DecodeImm8Float(Imm, Size);
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break;
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}
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}
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else if ((ModeHigh & 0b110) == 0b100)
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{
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//16-bits shifted Immediate.
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Size = 1; Imm <<= (ModeHigh & 1) << 3;
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}
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else if ((ModeHigh & 0b100) == 0b000)
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{
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//32-bits shifted Immediate.
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Size = 2; Imm <<= ModeHigh << 3;
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}
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else if ((ModeHigh & 0b111) == 0b110)
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{
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//32-bits shifted Immediate (fill with ones).
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Size = 2; Imm = ShlOnes(Imm, 8 << ModeLow);
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}
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else
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{
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//8 bits without shift.
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Size = 0;
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}
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this.Imm = Imm;
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RegisterSize = ((OpCode >> 30) & 1) != 0
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? ARegisterSize.SIMD128
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: ARegisterSize.SIMD64;
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}
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private static long ShlOnes(long Value, int Shift)
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{
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return Value << Shift | (long)(ulong.MaxValue >> (64 - Shift));
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}
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}
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} |