97 lines
2.3 KiB
C#
97 lines
2.3 KiB
C#
using ChocolArm64.Instructions;
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namespace ChocolArm64.Decoders
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{
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class OpCodeSimdMemSs64 : OpCodeMemReg64, IOpCodeSimd64
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{
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public int SElems { get; private set; }
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public int Index { get; private set; }
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public bool Replicate { get; private set; }
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public bool WBack { get; private set; }
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public OpCodeSimdMemSs64(Inst inst, long position, int opCode) : base(inst, position, opCode)
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{
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int size = (opCode >> 10) & 3;
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int s = (opCode >> 12) & 1;
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int sElems = (opCode >> 12) & 2;
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int scale = (opCode >> 14) & 3;
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int l = (opCode >> 22) & 1;
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int q = (opCode >> 30) & 1;
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sElems |= (opCode >> 21) & 1;
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sElems++;
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int index = (q << 3) | (s << 2) | size;
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switch (scale)
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{
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case 1:
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{
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if ((size & 1) != 0)
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{
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inst = Inst.Undefined;
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return;
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}
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index >>= 1;
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break;
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}
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case 2:
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{
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if ((size & 2) != 0 ||
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((size & 1) != 0 && s != 0))
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{
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inst = Inst.Undefined;
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return;
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}
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if ((size & 1) != 0)
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{
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index >>= 3;
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scale = 3;
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}
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else
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{
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index >>= 2;
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}
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break;
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}
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case 3:
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{
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if (l == 0 || s != 0)
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{
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inst = Inst.Undefined;
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return;
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}
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scale = size;
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Replicate = true;
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break;
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}
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}
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Index = index;
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SElems = sElems;
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Size = scale;
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Extend64 = false;
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WBack = ((opCode >> 23) & 1) != 0;
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RegisterSize = q != 0
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? State.RegisterSize.Simd128
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: State.RegisterSize.Simd64;
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}
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}
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} |