/*  PCSX2 - PS2 Emulator for PCs
 *  Copyright (C) 2002-2009  PCSX2 Dev Team
 * 
 *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU Lesser General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with PCSX2.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

// Note: This header is meant to be included from within the x86Emitter::Internal namespace.
// Instructions implemented in this header are as follows -->>

enum G1Type
{
	G1Type_ADD=0,
	G1Type_OR,
	G1Type_ADC,
	G1Type_SBB,
	G1Type_AND,
	G1Type_SUB,
	G1Type_XOR,
	G1Type_CMP
};

// -------------------------------------------------------------------
//
template< G1Type InstType >
class xImpl_Group1
{
public:
	// ------------------------------------------------------------------------
	template< typename T > __forceinline void operator()( const xRegister<T>& to, const xRegister<T>& from ) const
	{
		prefix16<T>();
		xWrite8( (Is8BitOp<T>() ? 0 : 1) | (InstType<<3) );
		EmitSibMagic( from, to );
	}

	// ------------------------------------------------------------------------
	template< typename T > __noinline void operator()( const ModSibBase& sibdest, const xRegister<T>& from ) const
	{
		prefix16<T>();
		xWrite8( (Is8BitOp<T>() ? 0 : 1) | (InstType<<3) ); 
		EmitSibMagic( from, sibdest );
	}

	// ------------------------------------------------------------------------
	template< typename T > __noinline void operator()( const xRegister<T>& to, const ModSibBase& sibsrc ) const
	{
		prefix16<T>();
		xWrite8( (Is8BitOp<T>() ? 2 : 3) | (InstType<<3) );
		EmitSibMagic( to, sibsrc );
	}

	// ------------------------------------------------------------------------
	// Note on Imm forms : use int as the source operand since it's "reasonably inert" from a compiler
	// perspective.  (using uint tends to make the compiler try and fail to match signed immediates with
	// one of the other overloads).
	
	template< typename T > __noinline void operator()( const ModSibStrict<T>& sibdest, int imm ) const
	{
		if( Is8BitOp<T>() )
		{
			xWrite8( 0x80 );
			EmitSibMagic( InstType, sibdest );
			xWrite<s8>( imm );
		}
		else
		{		
			prefix16<T>();
			xWrite8( is_s8( imm ) ? 0x83 : 0x81 );
			EmitSibMagic( InstType, sibdest );
			if( is_s8( imm ) )
				xWrite<s8>( imm );
			else
				xWrite<T>( imm );
		}
	}

	// ------------------------------------------------------------------------
	template< typename T > __forceinline void operator()( const xRegister<T>& to, int imm ) const
	{
		prefix16<T>();
		if( !Is8BitOp<T>() && is_s8( imm ) )
		{
			xWrite8( 0x83 );
			EmitSibMagic( InstType, to );
			xWrite<s8>( imm );
		}
		else
		{
			if( to.IsAccumulator() )
				xWrite8( (Is8BitOp<T>() ? 4 : 5) | (InstType<<3) );
			else
			{
				xWrite8( Is8BitOp<T>() ? 0x80 : 0x81 );
				EmitSibMagic( InstType, to );
			}
			xWrite<T>( imm );
		}
	}
	
	// ------------------------------------------------------------------------
	template< typename T > __noinline void operator()( const ModSibBase& to, const xImmReg<T>& immOrReg ) const
	{
		_DoI_helpermess( *this, to, immOrReg );
	}

	template< typename T > __noinline void operator()( const xDirectOrIndirect<T>& to, const xImmReg<T>& immOrReg ) const
	{
		_DoI_helpermess( *this, to, immOrReg );
	}

	template< typename T > __noinline void operator()( const xDirectOrIndirect<T>& to, int imm ) const
	{
		_DoI_helpermess( *this, to, imm );
	}

	template< typename T > __noinline void operator()( const xDirectOrIndirect<T>& to, const xDirectOrIndirect<T>& from ) const
	{
		_DoI_helpermess( *this, to, from );
	}

	template< typename T > __noinline void operator()( const xRegister<T>& to, const xDirectOrIndirect<T>& from ) const
	{
		_DoI_helpermess( *this, xDirectOrIndirect<T>( to ), from );
	}

	template< typename T > __noinline void operator()( const xDirectOrIndirect<T>& to, const xRegister<T>& from ) const
	{
		_DoI_helpermess( *this, to, xDirectOrIndirect<T>( from ) );
	}

	xImpl_Group1() {}		// Why does GCC need these?
};

// ------------------------------------------------------------------------
// This class combines x86 with SSE/SSE2 logic operations (ADD, OR, and NOT).
// Note: ANDN [AndNot] is handled below separately.
//
template< G1Type InstType, u16 OpcodeSSE >
class xImpl_G1Logic : public xImpl_Group1<InstType>
{
public:
	using xImpl_Group1<InstType>::operator();

	const SimdImpl_DestRegSSE<0x00,OpcodeSSE> PS;		// packed single precision
	const SimdImpl_DestRegSSE<0x66,OpcodeSSE> PD;		// packed double precision

	xImpl_G1Logic() {}
};

// ------------------------------------------------------------------------
// This class combines x86 with SSE/SSE2 arithmetic operations (ADD/SUB).
//
template< G1Type InstType, u16 OpcodeSSE >
class xImpl_G1Arith : public xImpl_G1Logic<InstType, OpcodeSSE >
{
public:
	using xImpl_Group1<InstType>::operator();

	const SimdImpl_DestRegSSE<0xf3,OpcodeSSE> SS;		// scalar single precision
	const SimdImpl_DestRegSSE<0xf2,OpcodeSSE> SD;		// scalar double precision

	xImpl_G1Arith() {}
};

// ------------------------------------------------------------------------
class xImpl_G1Compare : xImpl_Group1< G1Type_CMP >
{
protected:
	template< u8 Prefix > struct Woot
	{
		__forceinline void operator()( const xRegisterSSE& to, const xRegisterSSE& from, SSE2_ComparisonType cmptype ) const{ xOpWrite0F( Prefix, 0xc2, to, from, (u8)cmptype ); }
		__forceinline void operator()( const xRegisterSSE& to, const ModSibBase& from, SSE2_ComparisonType cmptype ) const	{ xOpWrite0F( Prefix, 0xc2, to, from, (u8)cmptype ); }
		Woot() {}
	};

public:
	using xImpl_Group1<G1Type_CMP>::operator();

	const Woot<0x00> PS;
	const Woot<0x66> PD;
	const Woot<0xf3> SS;
	const Woot<0xf2> SD;

	xImpl_G1Compare() {} //GCWhat?
};