rjx-mirror/ARMeilleure/Decoders/OpCode32SimdShImm.cs
gdkchan c26f3774bd
Implement VMULL, VMLSL, VRSHR, VQRSHRN, VQRSHRUN AArch32 instructions + other fixes (#977)
* Implement VMULL, VMLSL, VQRSHRN, VQRSHRUN AArch32 instructions plus other fixes

* Re-align opcode table

* Re-enable undefined, use subclasses to fix checks

* Add test and fix VRSHR instruction

* PR feedback
2020-03-11 11:49:27 +11:00

44 lines
1.3 KiB
C#

namespace ARMeilleure.Decoders
{
class OpCode32SimdShImm : OpCode32Simd
{
public int Immediate { get; private set; }
public int Shift { get; private set; }
public OpCode32SimdShImm(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode)
{
Immediate = (opCode >> 16) & 0x3f;
var limm = ((opCode >> 1) & 0x40) | Immediate;
if ((limm & 0x40) == 0b1000000)
{
Size = 3;
Shift = Immediate;
}
else if ((limm & 0x60) == 0b0100000)
{
Size = 2;
Shift = Immediate - 32;
}
else if ((limm & 0x70) == 0b0010000)
{
Size = 1;
Shift = Immediate - 16;
}
else if ((limm & 0x78) == 0b0001000)
{
Size = 0;
Shift = Immediate - 8;
}
else
{
Instruction = InstDescriptor.Undefined;
}
if (GetType() == typeof(OpCode32SimdShImm) && DecoderHelper.VectorArgumentsInvalid(Q, Vd, Vm))
{
Instruction = InstDescriptor.Undefined;
}
}
}
}