public AOpCodeSimdShImm(AInst Inst, long Position, int OpCode) : base(Inst, Position)
{
Rd = (OpCode >> 0) & 0x1f;
Rn = (OpCode >> 5) & 0x1f;
Imm = (OpCode >> 16) & 0x7f;
Size = ABitUtils.HighestBitSet32(Imm >> 3);
RegisterSize = ((OpCode >> 30) & 1) != 0
? ARegisterSize.SIMD128
: ARegisterSize.SIMD64;
}
public static BitMask DecodeBitMask(int OpCode, bool Immediate)
{
int ImmS = (OpCode >> 10) & 0x3f;
int ImmR = (OpCode >> 16) & 0x3f;
int N = (OpCode >> 22) & 1;
int SF = (OpCode >> 31) & 1;
int Length = ABitUtils.HighestBitSet32((~ImmS & 0x3f) | (N << 6));
if (Length < 1 || (SF == 0 && N != 0))
{
return(BitMask.Invalid);
}
int Size = 1 << Length;
int Levels = Size - 1;
int S = ImmS & Levels;
int R = ImmR & Levels;
if (Immediate && S == Levels)
{
return(BitMask.Invalid);
}
long WMask = ABitUtils.FillWithOnes(S + 1);
long TMask = ABitUtils.FillWithOnes(((S - R) & Levels) + 1);
if (R > 0)
{
WMask = ABitUtils.RotateRight(WMask, R, Size);
WMask &= ABitUtils.FillWithOnes(Size);
}
return(new BitMask()
{
WMask = ABitUtils.Replicate(WMask, Size),
TMask = ABitUtils.Replicate(TMask, Size),
Pos = ImmS,
Shift = ImmR
});
}
public AOpCodeSimdShImm(AInst Inst, long Position, int OpCode) : base(Inst, Position, OpCode)
{
Imm = (OpCode >> 16) & 0x7f;
Size = ABitUtils.HighestBitSetNibble(Imm >> 3);
}
