public static void EmitDataLoadOper2(ILEmitterCtx context)
{
switch (context.CurrOp)
{
case IOpCodeAluImm64 op:
context.EmitLdc_I(op.Imm);
break;
case IOpCodeAluRs64 op:
context.EmitLdintzr(op.Rm);
switch (op.ShiftType)
{
case ShiftType.Lsl: context.EmitLsl(op.Shift); break;
case ShiftType.Lsr: context.EmitLsr(op.Shift); break;
case ShiftType.Asr: context.EmitAsr(op.Shift); break;
case ShiftType.Ror: context.EmitRor(op.Shift); break;
}
break;
case IOpCodeAluRx64 op:
context.EmitLdintzr(op.Rm);
context.EmitCast(op.IntType);
context.EmitLsl(op.Shift);
break;
}
}
public static void EmitAluLoadOper2(ILEmitterCtx context, bool setCarry = true)
{
switch (context.CurrOp)
{
// ARM32.
case OpCode32AluImm op:
context.EmitLdc_I4(op.Imm);
if (op.SetFlags && op.IsRotated)
{
context.EmitLdc_I4((int)((uint)op.Imm >> 31));
context.EmitStflg((int)PState.CBit);
}
break;
case OpCode32AluRsImm op:
EmitLoadRmShiftedByImmediate(context, op, setCarry);
break;
case OpCodeT16AluImm8 op:
context.EmitLdc_I4(op.Imm);
break;
// ARM64.
case IOpCodeAluImm64 op:
context.EmitLdc_I(op.Imm);
break;
case IOpCodeAluRs64 op:
context.EmitLdintzr(op.Rm);
switch (op.ShiftType)
{
case ShiftType.Lsl: context.EmitLsl(op.Shift); break;
case ShiftType.Lsr: context.EmitLsr(op.Shift); break;
case ShiftType.Asr: context.EmitAsr(op.Shift); break;
case ShiftType.Ror: context.EmitRor(op.Shift); break;
}
break;
case IOpCodeAluRx64 op:
context.EmitLdintzr(op.Rm);
context.EmitCast(op.IntType);
context.EmitLsl(op.Shift);
break;
default: throw new InvalidOperationException();
}
}
private static void EmitRrxC(ILEmitterCtx context, bool setCarry)
{
// Rotate right by 1 with carry.
if (setCarry)
{
context.Emit(OpCodes.Dup);
context.EmitLdc_I4(1);
context.Emit(OpCodes.And);
context.EmitSttmp();
}
context.EmitLsr(1);
context.EmitLdflg((int)PState.CBit);
context.EmitLsl(31);
context.Emit(OpCodes.Or);
if (setCarry)
{
context.EmitLdtmp();
context.EmitStflg((int)PState.CBit);
}
}
private static void EmitLoadAddress(ILEmitterCtx context)
{
switch (context.CurrOp)
{
case OpCodeMemImm64 op:
context.EmitLdint(op.Rn);
if (!op.PostIdx)
{
// Pre-indexing.
context.EmitLdc_I(op.Imm);
context.Emit(OpCodes.Add);
}
break;
case OpCodeMemReg64 op:
context.EmitLdint(op.Rn);
context.EmitLdintzr(op.Rm);
context.EmitCast(op.IntType);
if (op.Shift)
{
context.EmitLsl(op.Size);
}
context.Emit(OpCodes.Add);
break;
}
// Save address to Scratch var since the register value may change.
context.Emit(OpCodes.Dup);
context.EmitSttmp();
}
private static void EmitBfmLsl(ILEmitterCtx context)
{
OpCodeBfm64 op = (OpCodeBfm64)context.CurrOp;
context.EmitLdintzr(op.Rn);
context.EmitLsl(op.GetBitsCount() - op.Shift);
context.EmitStintzr(op.Rd);
}
public static void Bfm(ILEmitterCtx context)
{
OpCodeBfm64 op = (OpCodeBfm64)context.CurrOp;
if (op.Pos < op.Shift)
{
//BFI.
context.EmitLdintzr(op.Rn);
int shift = op.GetBitsCount() - op.Shift;
int width = op.Pos + 1;
long mask = (long)(ulong.MaxValue >> (64 - width));
context.EmitLdc_I(mask);
context.Emit(OpCodes.And);
context.EmitLsl(shift);
context.EmitLdintzr(op.Rd);
context.EmitLdc_I(~(mask << shift));
context.Emit(OpCodes.And);
context.Emit(OpCodes.Or);
context.EmitStintzr(op.Rd);
}
else
{
//BFXIL.
context.EmitLdintzr(op.Rn);
context.EmitLsr(op.Shift);
int width = op.Pos - op.Shift + 1;
long mask = (long)(ulong.MaxValue >> (64 - width));
context.EmitLdc_I(mask);
context.Emit(OpCodes.And);
context.EmitLdintzr(op.Rd);
context.EmitLdc_I(~mask);
context.Emit(OpCodes.And);
context.Emit(OpCodes.Or);
context.EmitStintzr(op.Rd);
}
}
public static void Sbfm(ILEmitterCtx context)
{
OpCodeBfm64 op = (OpCodeBfm64)context.CurrOp;
int bitsCount = op.GetBitsCount();
if (op.Pos + 1 == bitsCount)
{
EmitSbfmShift(context);
}
else if (op.Pos < op.Shift)
{
EmitSbfiz(context);
}
else if (op.Pos == 7 && op.Shift == 0)
{
EmitSbfmCast(context, OpCodes.Conv_I1);
}
else if (op.Pos == 15 && op.Shift == 0)
{
EmitSbfmCast(context, OpCodes.Conv_I2);
}
else if (op.Pos == 31 && op.Shift == 0)
{
EmitSbfmCast(context, OpCodes.Conv_I4);
}
else
{
EmitBfmLoadRn(context);
context.EmitLdintzr(op.Rn);
context.EmitLsl(bitsCount - 1 - op.Pos);
context.EmitAsr(bitsCount - 1);
context.EmitLdc_I(~op.TMask);
context.Emit(OpCodes.And);
context.Emit(OpCodes.Or);
context.EmitStintzr(op.Rd);
}
}
private static void EmitLslC(ILEmitterCtx context, bool setCarry, int shift)
{
if ((uint)shift > 32)
{
EmitShiftByMoreThan32(context, setCarry);
}
else if (shift == 32)
{
if (setCarry)
{
context.EmitLdc_I4(1);
context.Emit(OpCodes.And);
context.EmitStflg((int)PState.CBit);
}
else
{
context.Emit(OpCodes.Pop);
}
context.EmitLdc_I4(0);
}
else
{
if (setCarry)
{
context.Emit(OpCodes.Dup);
context.EmitLsr(32 - shift);
context.EmitLdc_I4(1);
context.Emit(OpCodes.And);
context.EmitStflg((int)PState.CBit);
}
context.EmitLsl(shift);
}
}
private static void EmitBfiz(ILEmitterCtx context, bool signed)
{
OpCodeBfm64 op = (OpCodeBfm64)context.CurrOp;
int width = op.Pos + 1;
context.EmitLdintzr(op.Rn);
context.EmitLsl(op.GetBitsCount() - width);
if (signed)
{
context.EmitAsr(op.Shift - width);
}
else
{
context.EmitLsr(op.Shift - width);
}
context.EmitStintzr(op.Rd);
}
private static void EmitLoadOrStore(ILEmitterCtx context, int size, AccessType accType)
{
OpCode32Mem op = (OpCode32Mem)context.CurrOp;
if (op.Index || op.WBack)
{
EmitLoadFromRegister(context, op.Rn);
context.EmitLdc_I4(op.Imm);
context.Emit(op.Add ? OpCodes.Add : OpCodes.Sub);
context.EmitSttmp();
}
if (op.Index)
{
context.EmitLdtmp();
}
else
{
EmitLoadFromRegister(context, op.Rn);
}
if ((accType & AccessType.Load) != 0)
{
if ((accType & AccessType.Signed) != 0)
{
EmitReadSx32Call(context, size);
}
else
{
EmitReadZxCall(context, size);
}
if (op.WBack)
{
context.EmitLdtmp();
EmitStoreToRegister(context, op.Rn);
}
if (size == DWordSizeLog2)
{
context.Emit(OpCodes.Dup);
context.EmitLdflg((int)PState.EBit);
ILLabel lblBigEndian = new ILLabel();
ILLabel lblEnd = new ILLabel();
context.Emit(OpCodes.Brtrue_S, lblBigEndian);
//Little endian mode.
context.Emit(OpCodes.Conv_U4);
EmitStoreToRegister(context, op.Rt);
context.EmitLsr(32);
context.Emit(OpCodes.Conv_U4);
EmitStoreToRegister(context, op.Rt | 1);
context.Emit(OpCodes.Br_S, lblEnd);
//Big endian mode.
context.MarkLabel(lblBigEndian);
context.EmitLsr(32);
context.Emit(OpCodes.Conv_U4);
EmitStoreToRegister(context, op.Rt);
context.Emit(OpCodes.Conv_U4);
EmitStoreToRegister(context, op.Rt | 1);
context.MarkLabel(lblEnd);
}
else
{
EmitStoreToRegister(context, op.Rt);
}
}
else
{
if (op.WBack)
{
context.EmitLdtmp();
EmitStoreToRegister(context, op.Rn);
}
EmitLoadFromRegister(context, op.Rt);
if (size == DWordSizeLog2)
{
context.Emit(OpCodes.Conv_U8);
context.EmitLdflg((int)PState.EBit);
ILLabel lblBigEndian = new ILLabel();
ILLabel lblEnd = new ILLabel();
context.Emit(OpCodes.Brtrue_S, lblBigEndian);
//Little endian mode.
EmitLoadFromRegister(context, op.Rt | 1);
context.Emit(OpCodes.Conv_U8);
context.EmitLsl(32);
context.Emit(OpCodes.Or);
context.Emit(OpCodes.Br_S, lblEnd);
//Big endian mode.
context.MarkLabel(lblBigEndian);
context.EmitLsl(32);
EmitLoadFromRegister(context, op.Rt | 1);
context.Emit(OpCodes.Conv_U8);
context.Emit(OpCodes.Or);
context.MarkLabel(lblEnd);
}
EmitWriteCall(context, size);
}
}