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using ARMeilleure.Decoders;
using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.Translation;
using static ARMeilleure.Instructions.InstEmitHelper;
using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
namespace ARMeilleure.Instructions
{
static partial class InstEmit
{
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);
}
public static void Sbfm(ArmEmitterContext context)
{
OpCodeBfm op = (OpCodeBfm)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)
{
Operand n = GetIntOrZR(context, op.Rn);
SetIntOrZR(context, op.Rd, context.SignExtend8(n.Type, n));
}
else if (op.Pos == 15 && op.Shift == 0)
{
Operand n = GetIntOrZR(context, op.Rn);
SetIntOrZR(context, op.Rd, context.SignExtend16(n.Type, n));
}
else if (op.Pos == 31 && op.Shift == 0)
{
Operand n = GetIntOrZR(context, op.Rn);
SetIntOrZR(context, op.Rd, context.SignExtend32(n.Type, n));
}
else
{
Operand res = GetIntOrZR(context, op.Rn);
res = context.ShiftLeft (res, Const(bitsCount - 1 - op.Pos));
res = context.ShiftRightSI(res, Const(bitsCount - 1));
res = context.BitwiseAnd (res, Const(res.Type, ~op.TMask));
Operand n2 = GetBfmN(context);
SetIntOrZR(context, op.Rd, context.BitwiseOr(res, n2));
}
}
public static void Ubfm(ArmEmitterContext context)
{
OpCodeBfm op = (OpCodeBfm)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)
{
Operand n = GetIntOrZR(context, op.Rn);
SetIntOrZR(context, op.Rd, context.BitwiseAnd(n, Const(n.Type, 0xff)));
}
else if (op.Pos == 15 && op.Shift == 0)
{
Operand n = GetIntOrZR(context, op.Rn);
SetIntOrZR(context, op.Rd, context.BitwiseAnd(n, Const(n.Type, 0xffff)));
}
else
{
SetIntOrZR(context, op.Rd, GetBfmN(context));
}
}
private static void EmitSbfiz(ArmEmitterContext context) => EmitBfiz(context, signed: true);
private static void EmitUbfiz(ArmEmitterContext context) => EmitBfiz(context, signed: false);
private static void EmitBfiz(ArmEmitterContext context, bool signed)
{
OpCodeBfm op = (OpCodeBfm)context.CurrOp;
int width = op.Pos + 1;
Operand res = GetIntOrZR(context, op.Rn);
res = context.ShiftLeft(res, Const(op.GetBitsCount() - width));
res = signed
? context.ShiftRightSI(res, Const(op.Shift - width))
: context.ShiftRightUI(res, Const(op.Shift - width));
SetIntOrZR(context, op.Rd, res);
}
private static void EmitSbfmShift(ArmEmitterContext context)
{
EmitBfmShift(context, signed: true);
}
private static void EmitUbfmShift(ArmEmitterContext context)
{
EmitBfmShift(context, signed: false);
}
private static void EmitBfmShift(ArmEmitterContext context, bool signed)
{
OpCodeBfm op = (OpCodeBfm)context.CurrOp;
Operand res = GetIntOrZR(context, op.Rn);
res = signed
? context.ShiftRightSI(res, Const(op.Shift))
: context.ShiftRightUI(res, Const(op.Shift));
SetIntOrZR(context, op.Rd, res);
}
private static void EmitBfmLsl(ArmEmitterContext context)
{
OpCodeBfm op = (OpCodeBfm)context.CurrOp;
Operand res = GetIntOrZR(context, op.Rn);
int shift = op.GetBitsCount() - op.Shift;
SetIntOrZR(context, op.Rd, context.ShiftLeft(res, Const(shift)));
}
private static Operand GetBfmN(ArmEmitterContext context)
{
OpCodeBfm op = (OpCodeBfm)context.CurrOp;
Operand res = GetIntOrZR(context, op.Rn);
long mask = op.WMask & op.TMask;
return context.BitwiseAnd(context.RotateRight(res, Const(op.Shift)), Const(res.Type, mask));
}
}
}
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