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using ChocolArm64.Decoder;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System.Reflection.Emit;
namespace ChocolArm64.Instruction
{
static partial class AInstEmit
{
public static void Bfm(AILEmitterCtx Context)
{
AOpCodeBfm Op = (AOpCodeBfm)Context.CurrOp;
EmitBfmLoadRn(Context);
Context.EmitLdintzr(Op.Rd);
Context.EmitLdc_I(~Op.WMask & Op.TMask);
Context.Emit(OpCodes.And);
Context.Emit(OpCodes.Or);
Context.EmitLdintzr(Op.Rd);
Context.EmitLdc_I(~Op.TMask);
Context.Emit(OpCodes.And);
Context.Emit(OpCodes.Or);
Context.EmitStintzr(Op.Rd);
}
public static void Sbfm(AILEmitterCtx Context)
{
AOpCodeBfm Op = (AOpCodeBfm)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);
}
}
public static void Ubfm(AILEmitterCtx Context)
{
AOpCodeBfm Op = (AOpCodeBfm)Context.CurrOp;
if (Op.Pos + 1 == Op.GetBitsCount())
{
EmitUbfmShift(Context);
}
else if (Op.Pos < Op.Shift)
{
EmitUbfiz(Context);
}
else if (Op.Pos + 1 == Op.Shift)
{
EmitBfmLsl(Context);
}
else if (Op.Pos == 7 && Op.Shift == 0)
{
EmitUbfmCast(Context, OpCodes.Conv_U1);
}
else if (Op.Pos == 15 && Op.Shift == 0)
{
EmitUbfmCast(Context, OpCodes.Conv_U2);
}
else
{
EmitBfmLoadRn(Context);
Context.EmitStintzr(Op.Rd);
}
}
private static void EmitSbfiz(AILEmitterCtx Context) => EmitBfiz(Context, true);
private static void EmitUbfiz(AILEmitterCtx Context) => EmitBfiz(Context, false);
private static void EmitBfiz(AILEmitterCtx Context, bool Signed)
{
AOpCodeBfm Op = (AOpCodeBfm)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 EmitSbfmCast(AILEmitterCtx Context, OpCode ILOp)
{
EmitBfmCast(Context, ILOp, true);
}
private static void EmitUbfmCast(AILEmitterCtx Context, OpCode ILOp)
{
EmitBfmCast(Context, ILOp, false);
}
private static void EmitBfmCast(AILEmitterCtx Context, OpCode ILOp, bool Signed)
{
AOpCodeBfm Op = (AOpCodeBfm)Context.CurrOp;
Context.EmitLdintzr(Op.Rn);
Context.Emit(ILOp);
if (Op.RegisterSize != ARegisterSize.Int32)
{
Context.Emit(Signed
? OpCodes.Conv_I8
: OpCodes.Conv_U8);
}
Context.EmitStintzr(Op.Rd);
}
private static void EmitSbfmShift(AILEmitterCtx Context)
{
EmitBfmShift(Context, true);
}
private static void EmitUbfmShift(AILEmitterCtx Context)
{
EmitBfmShift(Context, false);
}
private static void EmitBfmShift(AILEmitterCtx Context, bool Signed)
{
AOpCodeBfm Op = (AOpCodeBfm)Context.CurrOp;
Context.EmitLdintzr(Op.Rn);
Context.EmitLdc_I4(Op.Shift);
Context.Emit(Signed
? OpCodes.Shr
: OpCodes.Shr_Un);
Context.EmitStintzr(Op.Rd);
}
private static void EmitBfmLsl(AILEmitterCtx Context)
{
AOpCodeBfm Op = (AOpCodeBfm)Context.CurrOp;
Context.EmitLdintzr(Op.Rn);
Context.EmitLsl(Op.GetBitsCount() - Op.Shift);
Context.EmitStintzr(Op.Rd);
}
private static void EmitBfmLoadRn(AILEmitterCtx Context)
{
AOpCodeBfm Op = (AOpCodeBfm)Context.CurrOp;
Context.EmitLdintzr(Op.Rn);
Context.EmitRor(Op.Shift);
Context.EmitLdc_I(Op.WMask & Op.TMask);
Context.Emit(OpCodes.And);
}
}
}
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