Remove checks for 64-bit shift instructions

These aren't really needed; if it's for a 32-bit architecture that can't
handle 64-bit shifts, then the instruction won't be decoded in the first
place.  Because the registerSize is derived from the address size, it may
interfere with 64-bit architectures that are using signed 32-bit
addresses.

There are a few other places that check registerSize (for example, the
32->64 bit sign extension idiom and MADD, MADDU) that are suspect, but
not included in this commit.  The difference is that for 64-bit shifts,
checking at all for the register size is the problem; for those, the
check is still needed to figure out whether to sign extend or not, but
the value of registerSize is suspect.

Author: noone

arch/mips/il.cpp

@@ -1493,53 +1493,23 @@ bool GetLowLevelILForInstruction(Architecture* arch, uint64_t addr, LowLevelILFu
 			break;
 		case MIPS_DSLL:
 		case MIPS_DSLL32:
-			if (registerSize != 8)
-			{
-				il.AddInstruction(il.Unimplemented());
-				break;
-			}
 			il.AddInstruction(SetRegisterOrNop(il, 8, registerSize, op1.reg, il.ShiftLeft(8, ReadILOperand(il, instr, 2, registerSize), ReadILOperand(il, instr, 3, registerSize))));
 			break;
 		case MIPS_DSLLV:
-			if (registerSize != 8)
-			{
-				il.AddInstruction(il.Undefined());
-				break;
-			}
 			il.AddInstruction(SetRegisterOrNop(il, 8, registerSize, op1.reg, il.ShiftLeft(8, ReadILOperand(il, instr, 2, registerSize), il.And(8, ReadILOperand(il, instr, 3, registerSize), il.Const(8, 0x3f)))));
 			break;
 		case MIPS_DSRL:
 		case MIPS_DSRL32:
-			if (registerSize != 8)
-			{
-				il.AddInstruction(il.Unimplemented());
-				break;
-			}
 			il.AddInstruction(SetRegisterOrNop(il, 8, registerSize, op1.reg, il.LogicalShiftRight(8, ReadILOperand(il, instr, 2, registerSize), ReadILOperand(il, instr, 3, registerSize))));
 			break;
 		case MIPS_DSRLV:
-			if (registerSize != 8)
-			{
-				il.AddInstruction(il.Undefined());
-				break;
-			}
 			il.AddInstruction(SetRegisterOrNop(il, 8, registerSize, op1.reg, il.LogicalShiftRight(8, ReadILOperand(il, instr, 2, registerSize), il.And(8, ReadILOperand(il, instr, 3, registerSize), il.Const(8, 0x3f)))));
 			break;
 		case MIPS_DSRA:
 		case MIPS_DSRA32:
-			if (registerSize != 8)
-			{
-				il.AddInstruction(il.Unimplemented());
-				break;
-			}
 			il.AddInstruction(SetRegisterOrNop(il, 8, registerSize, op1.reg, il.ArithShiftRight(8, ReadILOperand(il, instr, 2, registerSize), ReadILOperand(il, instr, 3, registerSize))));
 			break;
 		case MIPS_DSRAV:
-			if (registerSize != 8)
-			{
-				il.AddInstruction(il.Undefined());
-				break;
-			}
 			il.AddInstruction(SetRegisterOrNop(il, 8, registerSize, op1.reg, il.ArithShiftRight(8, ReadILOperand(il, instr, 2, registerSize), il.And(8, ReadILOperand(il, instr, 3, registerSize), il.Const(8, 0x3f)))));
 			break;
 		case MIPS_SB: