7af9fcbc06
* T32: Implement Data Processing (Modified Immediate) instructions * Update tests * switch -> lookup table
38 lines
No EOL
1.2 KiB
C#
38 lines
No EOL
1.2 KiB
C#
using ARMeilleure.Common;
|
|
using System.Runtime.Intrinsics;
|
|
|
|
namespace ARMeilleure.Decoders
|
|
{
|
|
class OpCodeT32AluImm : OpCodeT32Alu, IOpCode32AluImm
|
|
{
|
|
public int Immediate { get; }
|
|
|
|
public bool IsRotated { get; }
|
|
|
|
public new static OpCode Create(InstDescriptor inst, ulong address, int opCode) => new OpCodeT32AluImm(inst, address, opCode);
|
|
|
|
private static readonly Vector128<int> _factor = Vector128.Create(1, 0x00010001, 0x01000100, 0x01010101);
|
|
|
|
public OpCodeT32AluImm(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode)
|
|
{
|
|
int imm8 = (opCode >> 0) & 0xff;
|
|
int imm3 = (opCode >> 12) & 7;
|
|
int imm1 = (opCode >> 26) & 1;
|
|
|
|
int imm12 = imm8 | (imm3 << 8) | (imm1 << 11);
|
|
|
|
if ((imm12 >> 10) == 0)
|
|
{
|
|
Immediate = imm8 * _factor.GetElement((imm12 >> 8) & 3);
|
|
IsRotated = false;
|
|
}
|
|
else
|
|
{
|
|
int shift = imm12 >> 7;
|
|
|
|
Immediate = BitUtils.RotateRight(0x80 | (imm12 & 0x7f), shift, 32);
|
|
IsRotated = shift != 0;
|
|
}
|
|
}
|
|
}
|
|
} |