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using ARMeilleure.Decoders;
using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.State;
using ARMeilleure.Translation;
using static ARMeilleure.Instructions.InstEmitHelper;
using static ARMeilleure.Instructions.InstEmitAluHelper;
using static ARMeilleure.IntermediateRepresentation.OperandHelper;
namespace ARMeilleure.Instructions
{
static partial class InstEmit32
{
public static void Add(ArmEmitterContext context)
{
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
Operand n = GetAluN(context);
Operand m = GetAluM(context, setCarry: false);
Operand res = context.Add(n, m);
if (op.SetFlags)
{
EmitNZFlagsCheck(context, res);
EmitAddsCCheck(context, n, res);
EmitAddsVCheck(context, n, m, res);
}
EmitAluStore(context, res);
}
public static void Cmp(ArmEmitterContext context)
{
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
Operand n = GetAluN(context);
Operand m = GetAluM(context, setCarry: false);
Operand res = context.Subtract(n, m);
EmitNZFlagsCheck(context, res);
EmitSubsCCheck(context, n, res);
EmitSubsVCheck(context, n, m, res);
}
public static void Mov(ArmEmitterContext context)
{
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
Operand m = GetAluM(context);
if (op.SetFlags)
{
EmitNZFlagsCheck(context, m);
}
EmitAluStore(context, m);
}
public static void Sub(ArmEmitterContext context)
{
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
Operand n = GetAluN(context);
Operand m = GetAluM(context, setCarry: false);
Operand res = context.Subtract(n, m);
if (op.SetFlags)
{
EmitNZFlagsCheck(context, res);
EmitSubsCCheck(context, n, res);
EmitSubsVCheck(context, n, m, res);
}
EmitAluStore(context, res);
}
private static void EmitAluStore(ArmEmitterContext context, Operand value)
{
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
if (op.Rd == RegisterAlias.Aarch32Pc)
{
if (op.SetFlags)
{
// TODO: Load SPSR etc.
Operand isThumb = GetFlag(PState.TFlag);
Operand lblThumb = Label();
context.BranchIfTrue(lblThumb, isThumb);
context.Return(context.ZeroExtend32(OperandType.I64, context.BitwiseAnd(value, Const(~3))));
context.MarkLabel(lblThumb);
context.Return(context.ZeroExtend32(OperandType.I64, context.BitwiseAnd(value, Const(~1))));
}
else
{
EmitAluWritePc(context, value);
}
}
else
{
SetIntA32(context, op.Rd, value);
}
}
private static void EmitAluWritePc(ArmEmitterContext context, Operand value)
{
context.StoreToContext();
if (IsThumb(context.CurrOp))
{
context.Return(context.ZeroExtend32(OperandType.I64, context.BitwiseAnd(value, Const(~1))));
}
else
{
EmitBxWritePc(context, value);
}
}
}
}
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