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using ChocolArm64.Decoders;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System.Reflection.Emit;
using static ChocolArm64.Instructions.InstEmit32Helper;
using static ChocolArm64.Instructions.InstEmitAluHelper;
namespace ChocolArm64.Instructions
{
static partial class InstEmit32
{
public static void Add(ILEmitterCtx context)
{
IOpCodeAlu32 op = (IOpCodeAlu32)context.CurrOp;
EmitAluLoadOpers(context, setCarry: false);
context.Emit(OpCodes.Add);
if (op.SetFlags)
{
context.EmitZnFlagCheck();
EmitAddsCCheck(context);
EmitAddsVCheck(context);
}
EmitAluStore(context);
}
public static void Mov(ILEmitterCtx context)
{
IOpCodeAlu32 op = (IOpCodeAlu32)context.CurrOp;
EmitAluLoadOper2(context);
if (op.SetFlags)
{
context.EmitZnFlagCheck();
}
EmitAluStore(context);
}
public static void Sub(ILEmitterCtx context)
{
IOpCodeAlu32 op = (IOpCodeAlu32)context.CurrOp;
EmitAluLoadOpers(context, setCarry: false);
context.Emit(OpCodes.Sub);
if (op.SetFlags)
{
context.EmitZnFlagCheck();
EmitSubsCCheck(context);
EmitSubsVCheck(context);
}
EmitAluStore(context);
}
private static void EmitAluStore(ILEmitterCtx context)
{
IOpCodeAlu32 op = (IOpCodeAlu32)context.CurrOp;
if (op.Rd == RegisterAlias.Aarch32Pc)
{
if (op.SetFlags)
{
//TODO: Load SPSR etc.
context.EmitLdflg((int)PState.TBit);
ILLabel lblThumb = new ILLabel();
ILLabel lblEnd = new ILLabel();
context.Emit(OpCodes.Brtrue_S, lblThumb);
context.EmitLdc_I4(~3);
context.Emit(OpCodes.Br_S, lblEnd);
context.MarkLabel(lblThumb);
context.EmitLdc_I4(~1);
context.MarkLabel(lblEnd);
context.Emit(OpCodes.And);
context.Emit(OpCodes.Conv_U8);
context.Emit(OpCodes.Ret);
}
else
{
EmitAluWritePc(context);
}
}
else
{
context.EmitStint(GetRegisterAlias(context.Mode, op.Rd));
}
}
private static void EmitAluWritePc(ILEmitterCtx context)
{
if (IsThumb(context.CurrOp))
{
context.EmitLdc_I4(~1);
context.Emit(OpCodes.And);
context.Emit(OpCodes.Conv_U8);
context.Emit(OpCodes.Ret);
}
else
{
EmitBxWritePc(context);
}
}
}
}
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