public static void EmitGenericAluStoreA32(ArmEmitterContext context, int rd, bool setFlags, Operand value)
{
Debug.Assert(value.Type == OperandType.I32);
if (rd == RegisterAlias.Aarch32Pc && setFlags)
{
if (setFlags)
{
// TODO: Load SPSR etc.
Operand isThumb = GetFlag(PState.TFlag);
Operand lblThumb = Label();
context.BranchIfTrue(lblThumb, isThumb);
// Make this count as a call, the translator will ignore the low bit for the address.
context.Return(context.ZeroExtend32(OperandType.I64, context.BitwiseOr(context.BitwiseAnd(value, Const(~3)), Const(1))));
context.MarkLabel(lblThumb);
context.Return(context.ZeroExtend32(OperandType.I64, context.BitwiseOr(value, Const(1))));
}
else
{
EmitAluWritePc(context, value);
}
}
else
{
SetIntA32(context, rd, value);
}
}
private static Operand EmitReverseBits8Op(ArmEmitterContext context, Operand op)
{
Debug.Assert(op.Type == OperandType.I64);
Operand val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(op, Const(0xaaul)), Const(1)),
context.ShiftLeft(context.BitwiseAnd(op, Const(0x55ul)), Const(1)));
val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(val, Const(0xccul)), Const(2)),
context.ShiftLeft(context.BitwiseAnd(val, Const(0x33ul)), Const(2)));
return(context.BitwiseOr(context.ShiftRightUI(val, Const(4)),
context.ShiftLeft(context.BitwiseAnd(val, Const(0x0ful)), Const(4))));
}
private static void EmitGetNzcv(ArmEmitterContext context)
{
OpCodeSystem op = (OpCodeSystem)context.CurrOp;
Operand vSh = context.ShiftLeft(GetFlag(PState.VFlag), Const((int)PState.VFlag));
Operand cSh = context.ShiftLeft(GetFlag(PState.CFlag), Const((int)PState.CFlag));
Operand zSh = context.ShiftLeft(GetFlag(PState.ZFlag), Const((int)PState.ZFlag));
Operand nSh = context.ShiftLeft(GetFlag(PState.NFlag), Const((int)PState.NFlag));
Operand nzcvSh = context.BitwiseOr(context.BitwiseOr(nSh, zSh), context.BitwiseOr(cSh, vSh));
SetIntOrZR(context, op.Rt, nzcvSh);
}
public static void Vrev(ArmEmitterContext context)
{
OpCode32Simd op = (OpCode32Simd)context.CurrOp;
EmitVectorUnaryOpZx32(context, (op1) =>
{
switch (op.Opc)
{
case 0:
switch (op.Size) // Swap bytes.
{
default:
return(op1);
case 1:
return(InstEmitAluHelper.EmitReverseBytes16_32Op(context, op1));
case 2:
case 3:
return(context.ByteSwap(op1));
}
case 1:
switch (op.Size)
{
default:
return(op1);
case 2:
return(context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(op1, Const(0xffff0000)), Const(16)),
context.ShiftLeft(context.BitwiseAnd(op1, Const(0x0000ffff)), Const(16))));
case 3:
return(context.BitwiseOr(
context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(op1, Const(0xffff000000000000ul)), Const(48)),
context.ShiftLeft(context.BitwiseAnd(op1, Const(0x000000000000fffful)), Const(48))),
context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(op1, Const(0x0000ffff00000000ul)), Const(16)),
context.ShiftLeft(context.BitwiseAnd(op1, Const(0x00000000ffff0000ul)), Const(16)))));
}
case 2:
// Swap upper and lower halves.
return(context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(op1, Const(0xffffffff00000000ul)), Const(32)),
context.ShiftLeft(context.BitwiseAnd(op1, Const(0x00000000fffffffful)), Const(32))));
}
return(op1);
});
}
private static void EmitGetFpscr(ArmEmitterContext context)
{
OpCode32SimdSpecial op = (OpCode32SimdSpecial)context.CurrOp;
Operand vSh = context.ShiftLeft(GetFpFlag(FPState.VFlag), Const((int)FPState.VFlag));
Operand cSh = context.ShiftLeft(GetFpFlag(FPState.CFlag), Const((int)FPState.CFlag));
Operand zSh = context.ShiftLeft(GetFpFlag(FPState.ZFlag), Const((int)FPState.ZFlag));
Operand nSh = context.ShiftLeft(GetFpFlag(FPState.NFlag), Const((int)FPState.NFlag));
Operand nzcvSh = context.BitwiseOr(context.BitwiseOr(nSh, zSh), context.BitwiseOr(cSh, vSh));
Operand fpscr = context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetFpscr)));
SetIntA32(context, op.Rt, context.BitwiseOr(nzcvSh, fpscr));
}
private static void EmitHsub8(ArmEmitterContext context, bool unsigned)
{
OpCode32AluReg op = (OpCode32AluReg)context.CurrOp;
Operand m = GetIntA32(context, op.Rm);
Operand n = GetIntA32(context, op.Rn);
Operand left, right, carry, res;
// This relies on the equality x-y == (x^y) - (((x^y)&y) << 1).
// Note that x^y always contains the LSB of the result.
// Since we want to calculate (x+y)/2, we can instead calculate ((x^y)>>1) - ((x^y)&y).
carry = context.BitwiseExclusiveOr(m, n);
left = context.ShiftRightUI(carry, Const(1));
right = context.BitwiseAnd(carry, m);
// We must now perform a partitioned subtraction.
// We can do this because minuend contains 7 bit fields.
// We use the extra bit in minuend as a bit to borrow from; we set this bit.
// We invert this bit at the end as this tells us if that bit was borrowed from.
res = context.BitwiseOr(left, Const(0x80808080));
res = context.Subtract(res, right);
res = context.BitwiseExclusiveOr(res, Const(0x80808080));
if (!unsigned)
{
// We then sign extend the result into this bit.
carry = context.BitwiseAnd(carry, Const(0x80808080));
res = context.BitwiseExclusiveOr(res, carry);
}
SetIntA32(context, op.Rd, res);
}
public static void Orr_Vi(ArmEmitterContext context)
{
if (Optimizations.UseSse2)
{
OpCodeSimdImm op = (OpCodeSimdImm)context.CurrOp;
int eSize = 8 << op.Size;
Operand d = GetVec(op.Rd);
Operand imm = eSize switch {
16 => X86GetAllElements(context, (short)op.Immediate),
32 => X86GetAllElements(context, (int)op.Immediate),
_ => throw new InvalidOperationException($"Invalid element size {eSize}.")
};
Operand res = context.AddIntrinsic(Intrinsic.X86Por, d, imm);
if (op.RegisterSize == RegisterSize.Simd64)
{
res = context.VectorZeroUpper64(res);
}
context.Copy(GetVec(op.Rd), res);
}
else
{
EmitVectorImmBinaryOp(context, (op1, op2) => context.BitwiseOr(op1, op2));
}
}
public static void EmitTailContinue(ArmEmitterContext context, Operand address, bool allowRejit = false)
{
// Left option here as it may be useful if we need to return to managed rather than tail call in future.
// (eg. for debug)
bool useTailContinue = true;
if (useTailContinue)
{
if (context.HighCq)
{
// If we're doing a tail continue in HighCq, reserve a space in the jump table to avoid calling back
// to the translator. This will always try to get a HighCq version of our continue target as well.
EmitJumpTableBranch(context, address, true);
}
else
{
if (allowRejit)
{
address = context.BitwiseOr(address, Const(CallFlag));
}
Operand fallbackAddr = context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetFunctionAddress)), address);
EmitNativeCall(context, fallbackAddr, true);
}
}
else
{
context.Return(address);
}
}
public static void Extr(ArmEmitterContext context)
{
OpCodeAluRs op = (OpCodeAluRs)context.CurrOp;
Operand res = GetIntOrZR(context, op.Rm);
if (op.Shift != 0)
{
if (op.Rn == op.Rm)
{
res = context.RotateRight(res, Const(op.Shift));
}
else
{
res = context.ShiftRightUI(res, Const(op.Shift));
Operand n = GetIntOrZR(context, op.Rn);
int invShift = op.GetBitsCount() - op.Shift;
res = context.BitwiseOr(res, context.ShiftLeft(n, Const(invShift)));
}
}
SetAluDOrZR(context, res);
}
private static void EmitBranchFallback(ArmEmitterContext context, Operand address, bool isJump)
{
address = context.BitwiseOr(address, Const(address.Type, (long)CallFlag)); // Set call flag.
Operand fallbackAddr = context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetFunctionAddress)), address);
EmitNativeCall(context, fallbackAddr, isJump);
}
public static Operand EmitReverseBits32Op(ArmEmitterContext context, Operand op)
{
Debug.Assert(op.Type == OperandType.I32);
Operand val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(op, Const(0xaaaaaaaau)), Const(1)),
context.ShiftLeft(context.BitwiseAnd(op, Const(0x55555555u)), Const(1)));
val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(val, Const(0xccccccccu)), Const(2)),
context.ShiftLeft(context.BitwiseAnd(val, Const(0x33333333u)), Const(2)));
val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(val, Const(0xf0f0f0f0u)), Const(4)),
context.ShiftLeft(context.BitwiseAnd(val, Const(0x0f0f0f0fu)), Const(4)));
val = context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(val, Const(0xff00ff00u)), Const(8)),
context.ShiftLeft(context.BitwiseAnd(val, Const(0x00ff00ffu)), Const(8)));
return(context.BitwiseOr(context.ShiftRightUI(val, Const(16)), context.ShiftLeft(val, Const(16))));
}
public static void Sli_V(ArmEmitterContext context)
{
OpCodeSimdShImm op = (OpCodeSimdShImm)context.CurrOp;
Operand res = context.VectorZero();
int elems = op.GetBytesCount() >> op.Size;
int shift = GetImmShl(op);
ulong mask = shift != 0 ? ulong.MaxValue >> (64 - shift) : 0;
for (int index = 0; index < elems; index++)
{
Operand ne = EmitVectorExtractZx(context, op.Rn, index, op.Size);
Operand neShifted = context.ShiftLeft(ne, Const(shift));
Operand de = EmitVectorExtractZx(context, op.Rd, index, op.Size);
Operand deMasked = context.BitwiseAnd(de, Const(mask));
Operand e = context.BitwiseOr(neShifted, deMasked);
res = EmitVectorInsert(context, res, e, index, op.Size);
}
context.Copy(GetVec(op.Rd), res);
}
public static Operand EmitAsrC(ArmEmitterContext context, Operand m, bool setCarry, Operand shift, Operand shiftIsZero)
{
Debug.Assert(m.Type == OperandType.I32 && shift.Type == OperandType.I32 && shiftIsZero.Type == OperandType.I32);
Operand l32Result;
Operand ge32Result;
Operand less32 = context.ICompareLess(shift, Const(32));
ge32Result = context.ShiftRightSI(m, Const(31));
if (setCarry)
{
EmitIfHelper(context, context.BitwiseOr(less32, shiftIsZero), () =>
{
SetCarryMLsb(context, ge32Result);
}, false);
}
l32Result = context.ShiftRightSI(m, shift);
if (setCarry)
{
EmitIfHelper(context, context.BitwiseAnd(less32, context.BitwiseNot(shiftIsZero)), () =>
{
Operand cOut = context.ShiftRightUI(m, context.Subtract(shift, Const(1)));
cOut = context.BitwiseAnd(cOut, Const(1));
SetFlag(context, PState.CFlag, cOut);
});
}
return(context.ConditionalSelect(less32, l32Result, ge32Result));
}
public static void Vmov_GD(ArmEmitterContext context)
{
OpCode32SimdMovGpDouble op = (OpCode32SimdMovGpDouble)context.CurrOp;
Operand vec = GetVecA32(op.Vm >> 1);
if (op.Op == 1)
{
// To general purpose.
Operand value = context.VectorExtract(OperandType.I64, vec, op.Vm & 1);
SetIntA32(context, op.Rt, context.ConvertI64ToI32(value));
SetIntA32(context, op.Rt2, context.ConvertI64ToI32(context.ShiftRightUI(value, Const(32))));
}
else
{
// From general purpose.
Operand lowValue = GetIntA32(context, op.Rt);
Operand highValue = GetIntA32(context, op.Rt2);
Operand value = context.BitwiseOr(
context.ZeroExtend32(OperandType.I64, lowValue),
context.ShiftLeft(context.ZeroExtend32(OperandType.I64, highValue), Const(32)));
context.Copy(vec, context.VectorInsert(vec, value, op.Vm & 1));
}
}
public static Operand EmitReverseBytes16_64Op(ArmEmitterContext context, Operand op)
{
Debug.Assert(op.Type == OperandType.I64);
return(context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(op, Const(0xff00ff00ff00ff00ul)), Const(8)),
context.ShiftLeft(context.BitwiseAnd(op, Const(0x00ff00ff00ff00fful)), Const(8))));
}
public static void Orn_V(ArmEmitterContext context)
{
if (Optimizations.UseSse2)
{
OpCodeSimdReg op = (OpCodeSimdReg)context.CurrOp;
Operand n = GetVec(op.Rn);
Operand m = GetVec(op.Rm);
Operand mask = X86GetAllElements(context, -1L);
Operand res = context.AddIntrinsic(Intrinsic.X86Pandn, m, mask);
res = context.AddIntrinsic(Intrinsic.X86Por, res, n);
if (op.RegisterSize == RegisterSize.Simd64)
{
res = context.VectorZeroUpper64(res);
}
context.Copy(GetVec(op.Rd), res);
}
else
{
EmitVectorBinaryOpZx(context, (op1, op2) =>
{
return(context.BitwiseOr(op1, context.BitwiseNot(op2)));
});
}
}
public static void EmitBxWritePc(ArmEmitterContext context, Operand pc)
{
Operand mode = context.BitwiseAnd(pc, Const(1));
SetFlag(context, PState.TFlag, mode);
Operand lblArmMode = Label();
context.BranchIfTrue(lblArmMode, mode);
// Make this count as a call, the translator will ignore the low bit for the address.
context.Return(context.ZeroExtend32(OperandType.I64, context.BitwiseOr(pc, Const((int)InstEmitFlowHelper.CallFlag))));
context.MarkLabel(lblArmMode);
context.Return(context.ZeroExtend32(OperandType.I64, context.BitwiseOr(context.BitwiseAnd(pc, Const(~3)), Const((int)InstEmitFlowHelper.CallFlag))));
}
public static void EmitDynamicTableCall(ArmEmitterContext context, Operand tableAddress, Operand address, bool isJump)
{
// Loop over elements of the dynamic table. Unrolled loop.
Operand endLabel = Label();
Operand fallbackLabel = Label();
void EmitTableEntry(Operand entrySkipLabel)
{
// Try to take this entry in the table if its guest address equals 0.
Operand gotResult = context.CompareAndSwap(tableAddress, Const(0L), address);
// Is the address ours? (either taken via CompareAndSwap (0), or what was already here)
context.BranchIfFalse(entrySkipLabel,
context.BitwiseOr(
context.ICompareEqual(gotResult, address),
context.ICompareEqual(gotResult, Const(0L)))
);
// It's ours, so what function is it pointing to?
Operand targetFunctionPtr = context.Add(tableAddress, Const(8L));
Operand targetFunction = context.Load(OperandType.I64, targetFunctionPtr);
// Call the function.
// We pass in the entry address as the guest address, as the entry may need to be updated by the
// indirect call stub.
EmitNativeCallWithGuestAddress(context, targetFunction, tableAddress, isJump);
context.Branch(endLabel);
}
// Currently this uses a size of 1, as higher values inflate code size for no real benefit.
for (int i = 0; i < JumpTable.DynamicTableElems; i++)
{
if (i == JumpTable.DynamicTableElems - 1)
{
// If this is the last entry, avoid emitting the additional label and add.
EmitTableEntry(fallbackLabel);
}
else
{
Operand nextLabel = Label();
EmitTableEntry(nextLabel);
context.MarkLabel(nextLabel);
// Move to the next table entry.
tableAddress = context.Add(tableAddress, Const((long)JumpTable.JumpTableStride));
}
}
context.MarkLabel(fallbackLabel);
EmitBranchFallback(context, address, isJump);
context.MarkLabel(endLabel);
}
private static Operand EmitReverseBytes32_64Op(ArmEmitterContext context, Operand op)
{
Debug.Assert(op.Type == OperandType.I64);
Operand val = EmitReverseBytes16_64Op(context, op);
return(context.BitwiseOr(context.ShiftRightUI(context.BitwiseAnd(val, Const(0xffff0000ffff0000ul)), Const(16)),
context.ShiftLeft(context.BitwiseAnd(val, Const(0x0000ffff0000fffful)), Const(16))));
}
public static void Orn(ArmEmitterContext context)
{
Operand n = GetAluN(context);
Operand m = GetAluM(context);
Operand d = context.BitwiseOr(n, context.BitwiseNot(m));
SetAluD(context, d);
}
private static void EmitExtend16(ArmEmitterContext context, bool signed)
{
IOpCode32AluUx op = (IOpCode32AluUx)context.CurrOp;
Operand m = GetAluM(context);
Operand res;
if (op.RotateBits == 0)
{
res = m;
}
else
{
Operand rotate = Const(op.RotateBits);
res = context.RotateRight(m, rotate);
}
Operand low16, high16;
if (signed)
{
low16 = context.SignExtend8(OperandType.I32, res);
high16 = context.SignExtend8(OperandType.I32, context.ShiftRightUI(res, Const(16)));
}
else
{
low16 = context.ZeroExtend8(OperandType.I32, res);
high16 = context.ZeroExtend8(OperandType.I32, context.ShiftRightUI(res, Const(16)));
}
if (op.Add)
{
Operand n = GetAluN(context);
Operand lowAdd, highAdd;
if (signed)
{
lowAdd = context.SignExtend16(OperandType.I32, n);
highAdd = context.SignExtend16(OperandType.I32, context.ShiftRightUI(n, Const(16)));
}
else
{
lowAdd = context.ZeroExtend16(OperandType.I32, n);
highAdd = context.ZeroExtend16(OperandType.I32, context.ShiftRightUI(n, Const(16)));
}
low16 = context.Add(low16, lowAdd);
high16 = context.Add(high16, highAdd);
}
res = context.BitwiseOr(
context.ZeroExtend16(OperandType.I32, low16),
context.ShiftLeft(context.ZeroExtend16(OperandType.I32, high16), Const(16)));
EmitAluStore(context, res);
}
private static void EmitSri(ArmEmitterContext context, bool scalar)
{
OpCodeSimdShImm op = (OpCodeSimdShImm)context.CurrOp;
int shift = GetImmShr(op);
int eSize = 8 << op.Size;
ulong mask = (ulong.MaxValue << (eSize - shift)) & (ulong.MaxValue >> (64 - eSize));
if (Optimizations.UseSse2 && op.Size > 0)
{
Operand d = GetVec(op.Rd);
Operand n = GetVec(op.Rn);
Intrinsic srlInst = X86PsrlInstruction[op.Size];
Operand nShifted = context.AddIntrinsic(srlInst, n, Const(shift));
Operand dMask = X86GetAllElements(context, (long)mask * _masks_SliSri[op.Size]);
Operand dMasked = context.AddIntrinsic(Intrinsic.X86Pand, d, dMask);
Operand res = context.AddIntrinsic(Intrinsic.X86Por, nShifted, dMasked);
if ((op.RegisterSize == RegisterSize.Simd64) || scalar)
{
res = context.VectorZeroUpper64(res);
}
context.Copy(d, res);
}
else
{
Operand res = context.VectorZero();
int elems = !scalar?op.GetBytesCount() >> op.Size : 1;
for (int index = 0; index < elems; index++)
{
Operand ne = EmitVectorExtractZx(context, op.Rn, index, op.Size);
Operand neShifted = shift != 64 ? context.ShiftRightUI(ne, Const(shift)) : Const(0UL);
Operand de = EmitVectorExtractZx(context, op.Rd, index, op.Size);
Operand deMasked = context.BitwiseAnd(de, Const(mask));
Operand e = context.BitwiseOr(neShifted, deMasked);
res = EmitVectorInsert(context, res, e, index, op.Size);
}
context.Copy(GetVec(op.Rd), res);
}
}
public static void EmitAdcsCCheck(ArmEmitterContext context, Operand n, Operand d)
{
// C = (Rd == Rn && CIn) || Rd < Rn
Operand cIn = GetFlag(PState.CFlag);
Operand cOut = context.BitwiseAnd(context.ICompareEqual(d, n), cIn);
cOut = context.BitwiseOr(cOut, context.ICompareLessUI(d, n));
SetFlag(context, PState.CFlag, cOut);
}
public static void EmitBxWritePc(ArmEmitterContext context, Operand pc, int sourceRegister = 0)
{
bool isReturn = sourceRegister == RegisterAlias.Aarch32Lr || IsA32Return(context);
Operand mode = context.BitwiseAnd(pc, Const(1));
SetFlag(context, PState.TFlag, mode);
Operand addr = context.ConditionalSelect(mode, context.BitwiseOr(pc, Const((int)InstEmitFlowHelper.CallFlag)), context.BitwiseAnd(pc, Const(~3)));
InstEmitFlowHelper.EmitVirtualJump(context, addr, isReturn);
}
public static void EmitSbcsCCheck(ArmEmitterContext context, Operand n, Operand m)
{
// C = (Rn == Rm && CIn) || Rn > Rm
Operand cIn = GetFlag(PState.CFlag);
Operand cOut = context.BitwiseAnd(context.ICompareEqual(n, m), cIn);
cOut = context.BitwiseOr(cOut, context.ICompareGreaterUI(n, m));
SetFlag(context, PState.CFlag, cOut);
}
public static void Vorr_I(ArmEmitterContext context)
{
if (Optimizations.UseSse2)
{
EmitVectorBinaryOpSimd32(context, (n, m) => context.AddIntrinsic(Intrinsic.X86Por, n, m));
}
else
{
EmitVectorBinaryOpZx32(context, (op1, op2) => context.BitwiseOr(op1, op2));
}
}
public static void Movt(ArmEmitterContext context)
{
OpCode32AluImm16 op = (OpCode32AluImm16)context.CurrOp;
Operand d = GetIntA32(context, op.Rd);
Operand imm = Const(op.Immediate << 16); // Immeditate value as top halfword.
Operand res = context.BitwiseAnd(d, Const(0x0000ffff));
res = context.BitwiseOr(res, imm);
EmitAluStore(context, res);
}
private static Operand EmitShlRegOp(ArmEmitterContext context, Operand op, Operand shiftLsB, int size, bool unsigned)
{
if (shiftLsB.Type == OperandType.I64)
{
shiftLsB = context.ConvertI64ToI32(shiftLsB);
}
shiftLsB = context.SignExtend8(OperandType.I32, shiftLsB);
Debug.Assert((uint)size < 4u);
Operand negShiftLsB = context.Negate(shiftLsB);
Operand isPositive = context.ICompareGreaterOrEqual(shiftLsB, Const(0));
Operand shl = context.ShiftLeft(op, shiftLsB);
Operand shr = unsigned ? context.ShiftRightUI(op, negShiftLsB) : context.ShiftRightSI(op, negShiftLsB);
Operand res = context.ConditionalSelect(isPositive, shl, shr);
if (unsigned)
{
Operand isOutOfRange = context.BitwiseOr(
context.ICompareGreaterOrEqual(shiftLsB, Const(8 << size)),
context.ICompareGreaterOrEqual(negShiftLsB, Const(8 << size)));
return(context.ConditionalSelect(isOutOfRange, Const(op.Type, 0), res));
}
else
{
Operand isOutOfRange0 = context.ICompareGreaterOrEqual(shiftLsB, Const(8 << size));
Operand isOutOfRangeN = context.ICompareGreaterOrEqual(negShiftLsB, Const(8 << size));
// Also zero if shift is too negative, but value was positive.
isOutOfRange0 = context.BitwiseOr(isOutOfRange0, context.BitwiseAnd(isOutOfRangeN, context.ICompareGreaterOrEqual(op, Const(op.Type, 0))));
Operand min = (op.Type == OperandType.I64) ? Const(-1L) : Const(-1);
return(context.ConditionalSelect(isOutOfRange0, Const(op.Type, 0), context.ConditionalSelect(isOutOfRangeN, min, res)));
}
}
public static void Pkh(ArmEmitterContext context)
{
OpCode32AluRsImm op = (OpCode32AluRsImm)context.CurrOp;
Operand n = GetAluN(context);
Operand m = GetAluM(context);
Operand res;
bool tbform = op.ShiftType == ShiftType.Asr;
if (tbform)
{
res = context.BitwiseOr(context.BitwiseAnd(n, Const(0xFFFF0000)), context.BitwiseAnd(m, Const(0xFFFF)));
}
else
{
res = context.BitwiseOr(context.BitwiseAnd(m, Const(0xFFFF0000)), context.BitwiseAnd(n, Const(0xFFFF)));
}
EmitAluStore(context, res);
}
public static void Bfm(ArmEmitterContext context)
{
OpCodeBfm op = (OpCodeBfm)context.CurrOp;
Operand d = GetIntOrZR(context, op.Rd);
Operand n = GetIntOrZR(context, op.Rn);
Operand res;
if (op.Pos < op.Shift)
{
// BFI.
int shift = op.GetBitsCount() - op.Shift;
int width = op.Pos + 1;
long mask = (long)(ulong.MaxValue >> (64 - width));
res = context.ShiftLeft(context.BitwiseAnd(n, Const(n.Type, mask)), Const(shift));
res = context.BitwiseOr(res, context.BitwiseAnd(d, Const(d.Type, ~(mask << shift))));
}
else
{
// BFXIL.
int shift = op.Shift;
int width = op.Pos - shift + 1;
long mask = (long)(ulong.MaxValue >> (64 - width));
res = context.BitwiseAnd(context.ShiftRightUI(n, Const(shift)), Const(n.Type, mask));
res = context.BitwiseOr(res, context.BitwiseAnd(d, Const(d.Type, ~mask)));
}
SetIntOrZR(context, op.Rd, res);
}