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using ChocolArm64.Instruction;
using ChocolArm64.State;
namespace ChocolArm64.Decoder
{
class AOpCodeSimdMemSs : AOpCodeMemReg, IAOpCodeSimd
{
public int SElems { get; private set; }
public int Index { get; private set; }
public bool Replicate { get; private set; }
public bool WBack { get; private set; }
public AOpCodeSimdMemSs(AInst Inst, long Position, int OpCode) : base(Inst, Position, OpCode)
{
int Size = (OpCode >> 10) & 3;
int S = (OpCode >> 12) & 1;
int SElems = (OpCode >> 12) & 2;
int Scale = (OpCode >> 14) & 3;
int L = (OpCode >> 22) & 1;
int Q = (OpCode >> 30) & 1;
SElems |= (OpCode >> 21) & 1;
SElems++;
int Index = (Q << 3) | (S << 2) | Size;
switch (Scale)
{
case 1:
{
if ((Size & 1) != 0)
{
Inst = AInst.Undefined;
return;
}
Index >>= 1;
break;
}
case 2:
{
if ((Size & 2) != 0 ||
((Size & 1) != 0 && S != 0))
{
Inst = AInst.Undefined;
return;
}
if ((Size & 1) != 0)
{
Index >>= 3;
Scale = 3;
}
else
{
Index >>= 2;
}
break;
}
case 3:
{
if (L == 0 || S != 0)
{
Inst = AInst.Undefined;
return;
}
Scale = Size;
Replicate = true;
break;
}
}
this.SElems = SElems;
this.Size = Scale;
Extend64 = false;
WBack = ((OpCode >> 23) & 0x1) != 0;
RegisterSize = Q != 0
? ARegisterSize.SIMD128
: ARegisterSize.SIMD64;
}
}
}
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