// Copyright 2008 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

// WARNING - THIS LIBRARY IS NOT THREAD SAFE!!!

#pragma once

#include <cstddef>
#include <cstring>
#include <functional>

#include "Common/BitSet.h"
#include "Common/CodeBlock.h"
#include "Common/CommonTypes.h"

namespace Gen
{

enum X64Reg
{
	EAX = 0, EBX = 3, ECX = 1, EDX = 2,
	ESI = 6, EDI = 7, EBP = 5, ESP = 4,

	RAX = 0, RBX = 3, RCX = 1, RDX = 2,
	RSI = 6, RDI = 7, RBP = 5, RSP = 4,
	R8  = 8, R9  = 9, R10 = 10,R11 = 11,
	R12 = 12,R13 = 13,R14 = 14,R15 = 15,

	AL = 0, BL = 3, CL = 1, DL = 2,
	SIL = 6, DIL = 7, BPL = 5, SPL = 4,
	AH = 0x104, BH = 0x107, CH = 0x105, DH = 0x106,

	AX = 0, BX = 3, CX = 1, DX = 2,
	SI = 6, DI = 7, BP = 5, SP = 4,

	XMM0=0, XMM1, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7,
	XMM8, XMM9, XMM10, XMM11, XMM12, XMM13, XMM14, XMM15,

	YMM0=0, YMM1, YMM2, YMM3, YMM4, YMM5, YMM6, YMM7,
	YMM8, YMM9, YMM10, YMM11, YMM12, YMM13, YMM14, YMM15,

	INVALID_REG = 0xFFFFFFFF
};

enum CCFlags
{
	CC_O   = 0,
	CC_NO  = 1,
	CC_B   = 2, CC_C   = 2, CC_NAE = 2,
	CC_NB  = 3, CC_NC  = 3, CC_AE  = 3,
	CC_Z   = 4, CC_E   = 4,
	CC_NZ  = 5, CC_NE  = 5,
	CC_BE  = 6, CC_NA  = 6,
	CC_NBE = 7, CC_A   = 7,
	CC_S   = 8,
	CC_NS  = 9,
	CC_P   = 0xA, CC_PE  = 0xA,
	CC_NP  = 0xB, CC_PO  = 0xB,
	CC_L   = 0xC, CC_NGE = 0xC,
	CC_NL  = 0xD, CC_GE  = 0xD,
	CC_LE  = 0xE, CC_NG  = 0xE,
	CC_NLE = 0xF, CC_G   = 0xF
};

enum
{
	NUMGPRs = 16,
	NUMXMMs = 16,
};

enum
{
	SCALE_NONE = 0,
	SCALE_1 = 1,
	SCALE_2 = 2,
	SCALE_4 = 4,
	SCALE_8 = 8,
	SCALE_ATREG = 16,
	//SCALE_NOBASE_1 is not supported and can be replaced with SCALE_ATREG
	SCALE_NOBASE_2 = 34,
	SCALE_NOBASE_4 = 36,
	SCALE_NOBASE_8 = 40,
	SCALE_RIP = 0xFF,
	SCALE_IMM8  = 0xF0,
	SCALE_IMM16 = 0xF1,
	SCALE_IMM32 = 0xF2,
	SCALE_IMM64 = 0xF3,
};

enum NormalOp {
	nrmADD,
	nrmADC,
	nrmSUB,
	nrmSBB,
	nrmAND,
	nrmOR ,
	nrmXOR,
	nrmMOV,
	nrmTEST,
	nrmCMP,
	nrmXCHG,
};

enum SSECompare {
	CMP_EQ = 0,
	CMP_LT = 1,
	CMP_LE = 2,
	CMP_UNORD = 3,
	CMP_NEQ = 4,
	CMP_NLT = 5,
	CMP_NLE = 6,
	CMP_ORD = 7,
};

enum FloatOp {
	floatLD = 0,
	floatST = 2,
	floatSTP = 3,
	floatLD80 = 5,
	floatSTP80 = 7,

	floatINVALID = -1,
};

class XEmitter;

// RIP addressing does not benefit from micro op fusion on Core arch
struct OpArg
{
	friend class XEmitter; // For accessing offset and operandReg

	OpArg() {}  // dummy op arg, used for storage
	OpArg(u64 _offset, int _scale, X64Reg rmReg = RAX, X64Reg scaledReg = RAX)
	{
		operandReg = 0;
		scale = (u8)_scale;
		offsetOrBaseReg = (u16)rmReg;
		indexReg = (u16)scaledReg;
		//if scale == 0 never mind offsetting
		offset = _offset;
	}
	bool operator==(const OpArg& b) const
	{
		return operandReg == b.operandReg && scale == b.scale && offsetOrBaseReg == b.offsetOrBaseReg &&
		       indexReg == b.indexReg && offset == b.offset;
	}
	void WriteREX(XEmitter* emit, int opBits, int bits, int customOp = -1) const;
	void WriteVEX(XEmitter* emit, X64Reg regOp1, X64Reg regOp2, int L, int pp, int mmmmm, int W = 0) const;
	void WriteRest(XEmitter* emit, int extraBytes=0, X64Reg operandReg=INVALID_REG, bool warn_64bit_offset = true) const;
	void WriteFloatModRM(XEmitter* emit, FloatOp op);
	void WriteSingleByteOp(XEmitter* emit, u8 op, X64Reg operandReg, int bits);

	u64 Imm64() const { _dbg_assert_(DYNA_REC, scale == SCALE_IMM64); return (u64)offset; }
	u32 Imm32() const { _dbg_assert_(DYNA_REC, scale == SCALE_IMM32); return (u32)offset; }
	u16 Imm16() const { _dbg_assert_(DYNA_REC, scale == SCALE_IMM16); return (u16)offset; }
	u8  Imm8()  const { _dbg_assert_(DYNA_REC, scale == SCALE_IMM8);  return (u8)offset; }

	s64 SImm64() const { _dbg_assert_(DYNA_REC, scale == SCALE_IMM64); return (s64)offset; }
	s32 SImm32() const { _dbg_assert_(DYNA_REC, scale == SCALE_IMM32); return (s32)offset; }
	s16 SImm16() const { _dbg_assert_(DYNA_REC, scale == SCALE_IMM16); return (s16)offset; }
	s8  SImm8()  const { _dbg_assert_(DYNA_REC, scale == SCALE_IMM8);  return (s8)offset; }

	void WriteNormalOp(XEmitter* emit, bool toRM, NormalOp op, const OpArg& operand, int bits) const;
	bool IsImm() const {return scale == SCALE_IMM8 || scale == SCALE_IMM16 || scale == SCALE_IMM32 || scale == SCALE_IMM64;}
	bool IsSimpleReg() const {return scale == SCALE_NONE;}
	bool IsSimpleReg(X64Reg reg) const
	{
		return IsSimpleReg() && GetSimpleReg() == reg;
	}

	int GetImmBits() const
	{
		switch (scale)
		{
		case SCALE_IMM8: return 8;
		case SCALE_IMM16: return 16;
		case SCALE_IMM32: return 32;
		case SCALE_IMM64: return 64;
		default: return -1;
		}
	}

	X64Reg GetSimpleReg() const
	{
		if (scale == SCALE_NONE)
			return (X64Reg)offsetOrBaseReg;
		else
			return INVALID_REG;
	}

	void AddMemOffset(int val)
	{
		_dbg_assert_msg_(DYNA_REC, scale == SCALE_RIP || (scale <= SCALE_ATREG && scale > SCALE_NONE),
		                 "Tried to increment an OpArg which doesn't have an offset");
		offset += val;
	}

private:
	u8 scale;
	u16 offsetOrBaseReg;
	u16 indexReg;
	u64 offset;  // Also used to store immediates.
	u16 operandReg;
};

template <typename T>
inline OpArg M(const T* ptr)    {return OpArg((u64)(const void*)ptr, (int)SCALE_RIP);}
inline OpArg R(X64Reg value)    {return OpArg(0, SCALE_NONE, value);}
inline OpArg MatR(X64Reg value) {return OpArg(0, SCALE_ATREG, value);}

inline OpArg MDisp(X64Reg value, int offset)
{
	return OpArg((u32)offset, SCALE_ATREG, value);
}

inline OpArg MComplex(X64Reg base, X64Reg scaled, int scale, int offset)
{
	return OpArg(offset, scale, base, scaled);
}

inline OpArg MScaled(X64Reg scaled, int scale, int offset)
{
	if (scale == SCALE_1)
		return OpArg(offset, SCALE_ATREG, scaled);
	else
		return OpArg(offset, scale | 0x20, RAX, scaled);
}

inline OpArg MRegSum(X64Reg base, X64Reg offset)
{
	return MComplex(base, offset, 1, 0);
}

inline OpArg Imm8 (u8 imm)  {return OpArg(imm, SCALE_IMM8);}
inline OpArg Imm16(u16 imm) {return OpArg(imm, SCALE_IMM16);} //rarely used
inline OpArg Imm32(u32 imm) {return OpArg(imm, SCALE_IMM32);}
inline OpArg Imm64(u64 imm) {return OpArg(imm, SCALE_IMM64);}
inline OpArg ImmPtr(const void* imm) {return Imm64((u64)imm);}

inline u32 PtrOffset(const void* ptr, const void* base)
{
	s64 distance = (s64)ptr-(s64)base;
	if (distance >= 0x80000000LL ||
	    distance < -0x80000000LL)
	{
		_assert_msg_(DYNA_REC, 0, "pointer offset out of range");
		return 0;
	}

	return (u32)distance;
}

//usage: int a[]; ARRAY_OFFSET(a,10)
#define ARRAY_OFFSET(array,index) ((u32)((u64)&(array)[index]-(u64)&(array)[0]))
//usage: struct {int e;} s; STRUCT_OFFSET(s,e)
#define STRUCT_OFFSET(str,elem) ((u32)((u64)&(str).elem-(u64)&(str)))

struct FixupBranch
{
	u8* ptr;
	int type; //0 = 8bit 1 = 32bit
};

class XEmitter
{
	friend struct OpArg;  // for Write8 etc
private:
	u8* code;
	bool flags_locked;

	void CheckFlags();

	void Rex(int w, int r, int x, int b);
	void WriteModRM(int mod, int rm, int reg);
	void WriteSIB(int scale, int index, int base);
	void WriteSimple1Byte(int bits, u8 byte, X64Reg reg);
	void WriteSimple2Byte(int bits, u8 byte1, u8 byte2, X64Reg reg);
	void WriteMulDivType(int bits, OpArg src, int ext);
	void WriteBitSearchType(int bits, X64Reg dest, OpArg src, u8 byte2, bool rep = false);
	void WriteShift(int bits, OpArg dest, const OpArg& shift, int ext);
	void WriteBitTest(int bits, const OpArg& dest, const OpArg& index, int ext);
	void WriteMXCSR(OpArg arg, int ext);
	void WriteSSEOp(u8 opPrefix, u16 op, X64Reg regOp, OpArg arg, int extrabytes = 0);
	void WriteSSSE3Op(u8 opPrefix, u16 op, X64Reg regOp, const OpArg& arg, int extrabytes = 0);
	void WriteSSE41Op(u8 opPrefix, u16 op, X64Reg regOp, const OpArg& arg, int extrabytes = 0);
	void WriteVEXOp(u8 opPrefix, u16 op, X64Reg regOp1, X64Reg regOp2, const OpArg& arg, int W = 0, int extrabytes = 0);
	void WriteVEXOp4(u8 opPrefix, u16 op, X64Reg regOp1, X64Reg regOp2, const OpArg& arg, X64Reg regOp3, int W = 0);
	void WriteAVXOp(u8 opPrefix, u16 op, X64Reg regOp1, X64Reg regOp2, const OpArg& arg, int W = 0, int extrabytes = 0);
	void WriteAVXOp4(u8 opPrefix, u16 op, X64Reg regOp1, X64Reg regOp2, const OpArg& arg, X64Reg regOp3, int W = 0);
	void WriteFMA3Op(u8 op, X64Reg regOp1, X64Reg regOp2, const OpArg& arg, int W = 0);
	void WriteFMA4Op(u8 op, X64Reg dest, X64Reg regOp1, X64Reg regOp2, const OpArg& arg, int W = 0);
	void WriteBMIOp(int size, u8 opPrefix, u16 op, X64Reg regOp1, X64Reg regOp2, const OpArg& arg, int extrabytes = 0);
	void WriteBMI1Op(int size, u8 opPrefix, u16 op, X64Reg regOp1, X64Reg regOp2, const OpArg& arg, int extrabytes = 0);
	void WriteBMI2Op(int size, u8 opPrefix, u16 op, X64Reg regOp1, X64Reg regOp2, const OpArg& arg, int extrabytes = 0);
	void WriteMOVBE(int bits, u8 op, X64Reg regOp, const OpArg& arg);
	void WriteFloatLoadStore(int bits, FloatOp op, FloatOp op_80b, const OpArg& arg);
	void WriteNormalOp(int bits, NormalOp op, const OpArg& a1, const OpArg& a2);

	void ABI_CalculateFrameSize(BitSet32 mask, size_t rsp_alignment, size_t needed_frame_size, size_t* shadowp, size_t* subtractionp, size_t* xmm_offsetp);

protected:
	void Write8(u8 value);
	void Write16(u16 value);
	void Write32(u32 value);
	void Write64(u64 value);

public:
	XEmitter() { code = nullptr; flags_locked = false; }
	XEmitter(u8* code_ptr) { code = code_ptr; flags_locked = false; }
	virtual ~XEmitter() {}

	void SetCodePtr(u8* ptr);
	void ReserveCodeSpace(int bytes);
	const u8* AlignCode4();
	const u8* AlignCode16();
	const u8* AlignCodePage();
	const u8* GetCodePtr() const;
	u8* GetWritableCodePtr();

	void LockFlags() { flags_locked = true; }
	void UnlockFlags() { flags_locked = false; }

	// Looking for one of these? It's BANNED!! Some instructions are slow on modern CPU
	// INC, DEC, LOOP, LOOPNE, LOOPE, ENTER, LEAVE, XCHG, XLAT, REP MOVSB/MOVSD, REP SCASD + other string instr.,
	// INC and DEC are slow on Intel Core, but not on AMD. They create a
	// false flag dependency because they only update a subset of the flags.
	// XCHG is SLOW and should be avoided.

	// Debug breakpoint
	void INT3();

	// Do nothing
	void NOP(size_t count = 1);

	// Save energy in wait-loops on P4 only. Probably not too useful.
	void PAUSE();

	// Flag control
	void STC();
	void CLC();
	void CMC();

	// These two can not be executed in 64-bit mode on early Intel 64-bit CPU:s, only on Core2 and AMD!
	void LAHF(); // 3 cycle vector path
	void SAHF(); // direct path fast


	// Stack control
	void PUSH(X64Reg reg);
	void POP(X64Reg reg);
	void PUSH(int bits, const OpArg& reg);
	void POP(int bits, const OpArg& reg);
	void PUSHF();
	void POPF();

	// Flow control
	void RET();
	void RET_FAST();
	void UD2();
	FixupBranch J(bool force5bytes = false);

	void JMP(const u8* addr, bool force5Bytes = false);
	void JMPptr(const OpArg& arg);
	void JMPself(); //infinite loop!
#ifdef CALL
#undef CALL
#endif
	void CALL(const void* fnptr);
	void CALLptr(OpArg arg);

	FixupBranch J_CC(CCFlags conditionCode, bool force5bytes = false);
	void J_CC(CCFlags conditionCode, const u8* addr);

	void SetJumpTarget(const FixupBranch& branch);

	void SETcc(CCFlags flag, OpArg dest);
	// Note: CMOV brings small if any benefit on current CPUs.
	void CMOVcc(int bits, X64Reg dest, OpArg src, CCFlags flag);

	// Fences
	void LFENCE();
	void MFENCE();
	void SFENCE();

	// Bit scan
	void BSF(int bits, X64Reg dest, const OpArg& src); // Bottom bit to top bit
	void BSR(int bits, X64Reg dest, const OpArg& src); // Top bit to bottom bit

	// Cache control
	enum PrefetchLevel
	{
		PF_NTA, //Non-temporal (data used once and only once)
		PF_T0,  //All cache levels
		PF_T1,  //Levels 2+ (aliased to T0 on AMD)
		PF_T2,  //Levels 3+ (aliased to T0 on AMD)
	};
	void PREFETCH(PrefetchLevel level, OpArg arg);
	void MOVNTI(int bits, const OpArg& dest, X64Reg src);
	void MOVNTDQ(const OpArg& arg, X64Reg regOp);
	void MOVNTPS(const OpArg& arg, X64Reg regOp);
	void MOVNTPD(const OpArg& arg, X64Reg regOp);

	// Multiplication / division
	void MUL(int bits, const OpArg& src);  // UNSIGNED
	void IMUL(int bits, const OpArg& src); // SIGNED
	void IMUL(int bits, X64Reg regOp, const OpArg& src);
	void IMUL(int bits, X64Reg regOp, const OpArg& src, const OpArg& imm);
	void DIV(int bits, const OpArg& src);
	void IDIV(int bits, const OpArg& src);

	// Shift
	void ROL(int bits, const OpArg& dest, const OpArg& shift);
	void ROR(int bits, const OpArg& dest, const OpArg& shift);
	void RCL(int bits, const OpArg& dest, const OpArg& shift);
	void RCR(int bits, const OpArg& dest, const OpArg& shift);
	void SHL(int bits, const OpArg& dest, const OpArg& shift);
	void SHR(int bits, const OpArg& dest, const OpArg& shift);
	void SAR(int bits, const OpArg& dest, const OpArg& shift);

	// Bit Test
	void BT(int bits, const OpArg& dest, const OpArg& index);
	void BTS(int bits, const OpArg& dest, const OpArg& index);
	void BTR(int bits, const OpArg& dest, const OpArg& index);
	void BTC(int bits, const OpArg& dest, const OpArg& index);

	// Double-Precision Shift
	void SHRD(int bits, const OpArg& dest, const OpArg& src, const OpArg& shift);
	void SHLD(int bits, const OpArg& dest, const OpArg& src, const OpArg& shift);

	// Extend EAX into EDX in various ways
	void CWD(int bits = 16);
	inline void CDQ() {CWD(32);}
	inline void CQO() {CWD(64);}
	void CBW(int bits = 8);
	inline void CWDE() {CBW(16);}
	inline void CDQE() {CBW(32);}

	// Load effective address
	void LEA(int bits, X64Reg dest, OpArg src);

	// Integer arithmetic
	void NEG (int bits, const OpArg& src);
	void ADD (int bits, const OpArg& a1, const OpArg& a2);
	void ADC (int bits, const OpArg& a1, const OpArg& a2);
	void SUB (int bits, const OpArg& a1, const OpArg& a2);
	void SBB (int bits, const OpArg& a1, const OpArg& a2);
	void AND (int bits, const OpArg& a1, const OpArg& a2);
	void CMP (int bits, const OpArg& a1, const OpArg& a2);

	// Bit operations
	void NOT (int bits, const OpArg& src);
	void OR  (int bits, const OpArg& a1, const OpArg& a2);
	void XOR (int bits, const OpArg& a1, const OpArg& a2);
	void MOV (int bits, const OpArg& a1, const OpArg& a2);
	void TEST(int bits, const OpArg& a1, const OpArg& a2);

	void CMP_or_TEST(int bits, const OpArg& a1, const OpArg& a2);

	// Are these useful at all? Consider removing.
	void XCHG(int bits, const OpArg& a1, const OpArg& a2);
	void XCHG_AHAL();

	// Byte swapping (32 and 64-bit only).
	void BSWAP(int bits, X64Reg reg);

	// Sign/zero extension
	void MOVSX(int dbits, int sbits, X64Reg dest, OpArg src); //automatically uses MOVSXD if necessary
	void MOVZX(int dbits, int sbits, X64Reg dest, OpArg src);

	// Available only on Atom or >= Haswell so far. Test with cpu_info.bMOVBE.
	void MOVBE(int bits, X64Reg dest, const OpArg& src);
	void MOVBE(int bits, const OpArg& dest, X64Reg src);
	void LoadAndSwap(int size, X64Reg dst, const OpArg& src, bool sign_extend = false);
	u8* SwapAndStore(int size, const OpArg& dst, X64Reg src);

	// Available only on AMD >= Phenom or Intel >= Haswell
	void LZCNT(int bits, X64Reg dest, const OpArg& src);
	// Note: this one is actually part of BMI1
	void TZCNT(int bits, X64Reg dest, const OpArg& src);

	// WARNING - These two take 11-13 cycles and are VectorPath! (AMD64)
	void STMXCSR(const OpArg& memloc);
	void LDMXCSR(const OpArg& memloc);

	// Prefixes
	void LOCK();
	void REP();
	void REPNE();
	void FSOverride();
	void GSOverride();

	// x87
	enum x87StatusWordBits {
		x87_InvalidOperation = 0x1,
		x87_DenormalizedOperand = 0x2,
		x87_DivisionByZero = 0x4,
		x87_Overflow = 0x8,
		x87_Underflow = 0x10,
		x87_Precision = 0x20,
		x87_StackFault = 0x40,
		x87_ErrorSummary = 0x80,
		x87_C0 = 0x100,
		x87_C1 = 0x200,
		x87_C2 = 0x400,
		x87_TopOfStack = 0x2000 | 0x1000 | 0x800,
		x87_C3 = 0x4000,
		x87_FPUBusy = 0x8000,
	};

	void FLD(int bits, const OpArg& src);
	void FST(int bits, const OpArg& dest);
	void FSTP(int bits, const OpArg& dest);
	void FNSTSW_AX();
	void FWAIT();

	// SSE/SSE2: Floating point arithmetic
	void ADDSS(X64Reg regOp, const OpArg& arg);
	void ADDSD(X64Reg regOp, const OpArg& arg);
	void SUBSS(X64Reg regOp, const OpArg& arg);
	void SUBSD(X64Reg regOp, const OpArg& arg);
	void MULSS(X64Reg regOp, const OpArg& arg);
	void MULSD(X64Reg regOp, const OpArg& arg);
	void DIVSS(X64Reg regOp, const OpArg& arg);
	void DIVSD(X64Reg regOp, const OpArg& arg);
	void MINSS(X64Reg regOp, const OpArg& arg);
	void MINSD(X64Reg regOp, const OpArg& arg);
	void MAXSS(X64Reg regOp, const OpArg& arg);
	void MAXSD(X64Reg regOp, const OpArg& arg);
	void SQRTSS(X64Reg regOp, const OpArg& arg);
	void SQRTSD(X64Reg regOp, const OpArg& arg);
	void RCPSS(X64Reg regOp, const OpArg& arg);
	void RSQRTSS(X64Reg regOp, const OpArg& arg);

	// SSE/SSE2: Floating point bitwise (yes)
	void CMPSS(X64Reg regOp, const OpArg& arg, u8 compare);
	void CMPSD(X64Reg regOp, const OpArg& arg, u8 compare);

	// SSE/SSE2: Floating point packed arithmetic (x4 for float, x2 for double)
	void ADDPS(X64Reg regOp, const OpArg& arg);
	void ADDPD(X64Reg regOp, const OpArg& arg);
	void SUBPS(X64Reg regOp, const OpArg& arg);
	void SUBPD(X64Reg regOp, const OpArg& arg);
	void CMPPS(X64Reg regOp, const OpArg& arg, u8 compare);
	void CMPPD(X64Reg regOp, const OpArg& arg, u8 compare);
	void MULPS(X64Reg regOp, const OpArg& arg);
	void MULPD(X64Reg regOp, const OpArg& arg);
	void DIVPS(X64Reg regOp, const OpArg& arg);
	void DIVPD(X64Reg regOp, const OpArg& arg);
	void MINPS(X64Reg regOp, const OpArg& arg);
	void MINPD(X64Reg regOp, const OpArg& arg);
	void MAXPS(X64Reg regOp, const OpArg& arg);
	void MAXPD(X64Reg regOp, const OpArg& arg);
	void SQRTPS(X64Reg regOp, const OpArg& arg);
	void SQRTPD(X64Reg regOp, const OpArg& arg);
	void RCPPS(X64Reg regOp, const OpArg& arg);
	void RSQRTPS(X64Reg regOp, const OpArg& arg);

	// SSE/SSE2: Floating point packed bitwise (x4 for float, x2 for double)
	void ANDPS(X64Reg regOp, const OpArg& arg);
	void ANDPD(X64Reg regOp, const OpArg& arg);
	void ANDNPS(X64Reg regOp, const OpArg& arg);
	void ANDNPD(X64Reg regOp, const OpArg& arg);
	void ORPS(X64Reg regOp, const OpArg& arg);
	void ORPD(X64Reg regOp, const OpArg& arg);
	void XORPS(X64Reg regOp, const OpArg& arg);
	void XORPD(X64Reg regOp, const OpArg& arg);

	// SSE/SSE2: Shuffle components. These are tricky - see Intel documentation.
	void SHUFPS(X64Reg regOp, const OpArg& arg, u8 shuffle);
	void SHUFPD(X64Reg regOp, const OpArg& arg, u8 shuffle);

	// SSE3
	void MOVSLDUP(X64Reg regOp, const OpArg& arg);
	void MOVSHDUP(X64Reg regOp, const OpArg& arg);
	void MOVDDUP(X64Reg regOp, const OpArg& arg);

	// SSE/SSE2: Useful alternative to shuffle in some cases.
	void UNPCKLPS(X64Reg dest, const OpArg& src);
	void UNPCKHPS(X64Reg dest, const OpArg& src);
	void UNPCKLPD(X64Reg dest, const OpArg& src);
	void UNPCKHPD(X64Reg dest, const OpArg& src);

	// SSE/SSE2: Compares.
	void COMISS(X64Reg regOp, const OpArg& arg);
	void COMISD(X64Reg regOp, const OpArg& arg);
	void UCOMISS(X64Reg regOp, const OpArg& arg);
	void UCOMISD(X64Reg regOp, const OpArg& arg);

	// SSE/SSE2: Moves. Use the right data type for your data, in most cases.
	void MOVAPS(X64Reg regOp, const OpArg& arg);
	void MOVAPD(X64Reg regOp, const OpArg& arg);
	void MOVAPS(const OpArg& arg, X64Reg regOp);
	void MOVAPD(const OpArg& arg, X64Reg regOp);

	void MOVUPS(X64Reg regOp, const OpArg& arg);
	void MOVUPD(X64Reg regOp, const OpArg& arg);
	void MOVUPS(const OpArg& arg, X64Reg regOp);
	void MOVUPD(const OpArg& arg, X64Reg regOp);

	void MOVDQA(X64Reg regOp, const OpArg& arg);
	void MOVDQA(const OpArg& arg, X64Reg regOp);
	void MOVDQU(X64Reg regOp, const OpArg& arg);
	void MOVDQU(const OpArg& arg, X64Reg regOp);

	void MOVSS(X64Reg regOp, const OpArg& arg);
	void MOVSD(X64Reg regOp, const OpArg& arg);
	void MOVSS(const OpArg& arg, X64Reg regOp);
	void MOVSD(const OpArg& arg, X64Reg regOp);

	void MOVLPS(X64Reg regOp, const OpArg& arg);
	void MOVLPD(X64Reg regOp, const OpArg& arg);
	void MOVLPS(const OpArg& arg, X64Reg regOp);
	void MOVLPD(const OpArg& arg, X64Reg regOp);

	void MOVHPS(X64Reg regOp, const OpArg& arg);
	void MOVHPD(X64Reg regOp, const OpArg& arg);
	void MOVHPS(const OpArg& arg, X64Reg regOp);
	void MOVHPD(const OpArg& arg, X64Reg regOp);

	void MOVHLPS(X64Reg regOp1, X64Reg regOp2);
	void MOVLHPS(X64Reg regOp1, X64Reg regOp2);

	// Be careful when using these overloads for reg <--> xmm moves.
	// The one you cast to OpArg with R(reg) is the x86 reg, the other
	// one is the xmm reg.
	// ie: "MOVD_xmm(eax, R(xmm1))" generates incorrect code (movd xmm0, rcx)
	//     use "MOVD_xmm(R(eax), xmm1)" instead.
	void MOVD_xmm(X64Reg dest, const OpArg& arg);
	void MOVQ_xmm(X64Reg dest, OpArg arg);
	void MOVD_xmm(const OpArg& arg, X64Reg src);
	void MOVQ_xmm(OpArg arg, X64Reg src);

	// SSE/SSE2: Generates a mask from the high bits of the components of the packed register in question.
	void MOVMSKPS(X64Reg dest, const OpArg& arg);
	void MOVMSKPD(X64Reg dest, const OpArg& arg);

	// SSE2: Selective byte store, mask in src register. EDI/RDI specifies store address. This is a weird one.
	void MASKMOVDQU(X64Reg dest, X64Reg src);
	void LDDQU(X64Reg dest, const OpArg& src);

	// SSE/SSE2: Data type conversions.
	void CVTPS2PD(X64Reg dest, const OpArg& src);
	void CVTPD2PS(X64Reg dest, const OpArg& src);
	void CVTSS2SD(X64Reg dest, const OpArg& src);
	void CVTSI2SS(X64Reg dest, const OpArg& src);
	void CVTSD2SS(X64Reg dest, const OpArg& src);
	void CVTSI2SD(X64Reg dest, const OpArg& src);
	void CVTDQ2PD(X64Reg regOp, const OpArg& arg);
	void CVTPD2DQ(X64Reg regOp, const OpArg& arg);
	void CVTDQ2PS(X64Reg regOp, const OpArg& arg);
	void CVTPS2DQ(X64Reg regOp, const OpArg& arg);

	void CVTTPS2DQ(X64Reg regOp, const OpArg& arg);
	void CVTTPD2DQ(X64Reg regOp, const OpArg& arg);

	// Destinations are X64 regs (rax, rbx, ...) for these instructions.
	void CVTSS2SI(X64Reg xregdest, const OpArg& src);
	void CVTSD2SI(X64Reg xregdest, const OpArg& src);
	void CVTTSS2SI(X64Reg xregdest, const OpArg& arg);
	void CVTTSD2SI(X64Reg xregdest, const OpArg& arg);

	// SSE2: Packed integer instructions
	void PACKSSDW(X64Reg dest, const OpArg& arg);
	void PACKSSWB(X64Reg dest, const OpArg& arg);
	void PACKUSDW(X64Reg dest, const OpArg& arg);
	void PACKUSWB(X64Reg dest, const OpArg& arg);

	void PUNPCKLBW(X64Reg dest, const OpArg& arg);
	void PUNPCKLWD(X64Reg dest, const OpArg& arg);
	void PUNPCKLDQ(X64Reg dest, const OpArg& arg);
	void PUNPCKLQDQ(X64Reg dest, const OpArg& arg);

	void PTEST(X64Reg dest, const OpArg& arg);
	void PAND(X64Reg dest, const OpArg& arg);
	void PANDN(X64Reg dest, const OpArg& arg);
	void PXOR(X64Reg dest, const OpArg& arg);
	void POR(X64Reg dest, const OpArg& arg);

	void PADDB(X64Reg dest, const OpArg& arg);
	void PADDW(X64Reg dest, const OpArg& arg);
	void PADDD(X64Reg dest, const OpArg& arg);
	void PADDQ(X64Reg dest, const OpArg& arg);

	void PADDSB(X64Reg dest, const OpArg& arg);
	void PADDSW(X64Reg dest, const OpArg& arg);
	void PADDUSB(X64Reg dest, const OpArg& arg);
	void PADDUSW(X64Reg dest, const OpArg& arg);

	void PSUBB(X64Reg dest, const OpArg& arg);
	void PSUBW(X64Reg dest, const OpArg& arg);
	void PSUBD(X64Reg dest, const OpArg& arg);
	void PSUBQ(X64Reg dest, const OpArg& arg);

	void PSUBSB(X64Reg dest, const OpArg& arg);
	void PSUBSW(X64Reg dest, const OpArg& arg);
	void PSUBUSB(X64Reg dest, const OpArg& arg);
	void PSUBUSW(X64Reg dest, const OpArg& arg);

	void PAVGB(X64Reg dest, const OpArg& arg);
	void PAVGW(X64Reg dest, const OpArg& arg);

	void PCMPEQB(X64Reg dest, const OpArg& arg);
	void PCMPEQW(X64Reg dest, const OpArg& arg);
	void PCMPEQD(X64Reg dest, const OpArg& arg);

	void PCMPGTB(X64Reg dest, const OpArg& arg);
	void PCMPGTW(X64Reg dest, const OpArg& arg);
	void PCMPGTD(X64Reg dest, const OpArg& arg);

	void PEXTRW(X64Reg dest, const OpArg& arg, u8 subreg);
	void PINSRW(X64Reg dest, const OpArg& arg, u8 subreg);
	void PINSRD(X64Reg dest, const OpArg& arg, u8 subreg);

	void PMADDWD(X64Reg dest, const OpArg& arg);
	void PSADBW(X64Reg dest, const OpArg& arg);

	void PMAXSW(X64Reg dest, const OpArg& arg);
	void PMAXUB(X64Reg dest, const OpArg& arg);
	void PMINSW(X64Reg dest, const OpArg& arg);
	void PMINUB(X64Reg dest, const OpArg& arg);

	void PMOVMSKB(X64Reg dest, const OpArg& arg);
	void PSHUFD(X64Reg dest, const OpArg& arg, u8 shuffle);
	void PSHUFB(X64Reg dest, const OpArg& arg);

	void PSHUFLW(X64Reg dest, const OpArg& arg, u8 shuffle);
	void PSHUFHW(X64Reg dest, const OpArg& arg, u8 shuffle);

	void PSRLW(X64Reg reg, int shift);
	void PSRLD(X64Reg reg, int shift);
	void PSRLQ(X64Reg reg, int shift);
	void PSRLQ(X64Reg reg, const OpArg& arg);
	void PSRLDQ(X64Reg reg, int shift);

	void PSLLW(X64Reg reg, int shift);
	void PSLLD(X64Reg reg, int shift);
	void PSLLQ(X64Reg reg, int shift);
	void PSLLDQ(X64Reg reg, int shift);

	void PSRAW(X64Reg reg, int shift);
	void PSRAD(X64Reg reg, int shift);

	// SSE4: data type conversions
	void PMOVSXBW(X64Reg dest, const OpArg& arg);
	void PMOVSXBD(X64Reg dest, const OpArg& arg);
	void PMOVSXBQ(X64Reg dest, const OpArg& arg);
	void PMOVSXWD(X64Reg dest, const OpArg& arg);
	void PMOVSXWQ(X64Reg dest, const OpArg& arg);
	void PMOVSXDQ(X64Reg dest, const OpArg& arg);
	void PMOVZXBW(X64Reg dest, const OpArg& arg);
	void PMOVZXBD(X64Reg dest, const OpArg& arg);
	void PMOVZXBQ(X64Reg dest, const OpArg& arg);
	void PMOVZXWD(X64Reg dest, const OpArg& arg);
	void PMOVZXWQ(X64Reg dest, const OpArg& arg);
	void PMOVZXDQ(X64Reg dest, const OpArg& arg);

	// SSE4: blend instructions
	void PBLENDVB(X64Reg dest, const OpArg& arg);
	void BLENDVPS(X64Reg dest, const OpArg& arg);
	void BLENDVPD(X64Reg dest, const OpArg& arg);
	void BLENDPS(X64Reg dest, const OpArg& arg, u8 blend);
	void BLENDPD(X64Reg dest, const OpArg& arg, u8 blend);

	// AVX
	void VADDSD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VSUBSD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VMULSD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VDIVSD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VADDPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VSUBPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VMULPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VDIVPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VSQRTSD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VCMPPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg, u8 compare);
	void VSHUFPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg, u8 shuffle);
	void VUNPCKLPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VUNPCKHPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VBLENDVPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg, X64Reg mask);

	void VANDPS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VANDPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VANDNPS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VANDNPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VORPS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VORPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VXORPS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VXORPD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);

	void VPAND(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VPANDN(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VPOR(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VPXOR(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);

	// FMA3
	void VFMADD132PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADD213PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADD231PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADD132PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADD213PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADD231PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADD132SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADD213SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADD231SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADD132SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADD213SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADD231SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB132PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB213PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB231PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB132PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB213PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB231PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB132SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB213SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB231SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB132SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB213SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUB231SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD132PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD213PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD231PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD132PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD213PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD231PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD132SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD213SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD231SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD132SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD213SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMADD231SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB132PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB213PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB231PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB132PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB213PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB231PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB132SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB213SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB231SS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB132SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB213SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFNMSUB231SD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADDSUB132PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADDSUB213PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADDSUB231PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADDSUB132PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADDSUB213PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMADDSUB231PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUBADD132PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUBADD213PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUBADD231PS(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUBADD132PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUBADD213PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void VFMSUBADD231PD(X64Reg regOp1, X64Reg regOp2, const OpArg& arg);

	#define FMA4(name) \
	void name(X64Reg dest, X64Reg regOp1, X64Reg regOp2, const OpArg& arg); \
	void name(X64Reg dest, X64Reg regOp1, const OpArg& arg, X64Reg regOp2);

	FMA4(VFMADDSUBPS)
	FMA4(VFMADDSUBPD)
	FMA4(VFMSUBADDPS)
	FMA4(VFMSUBADDPD)
	FMA4(VFMADDPS)
	FMA4(VFMADDPD)
	FMA4(VFMADDSS)
	FMA4(VFMADDSD)
	FMA4(VFMSUBPS)
	FMA4(VFMSUBPD)
	FMA4(VFMSUBSS)
	FMA4(VFMSUBSD)
	FMA4(VFNMADDPS)
	FMA4(VFNMADDPD)
	FMA4(VFNMADDSS)
	FMA4(VFNMADDSD)
	FMA4(VFNMSUBPS)
	FMA4(VFNMSUBPD)
	FMA4(VFNMSUBSS)
	FMA4(VFNMSUBSD)
	#undef FMA4

	// VEX GPR instructions
	void SARX(int bits, X64Reg regOp1, const OpArg& arg, X64Reg regOp2);
	void SHLX(int bits, X64Reg regOp1, const OpArg& arg, X64Reg regOp2);
	void SHRX(int bits, X64Reg regOp1, const OpArg& arg, X64Reg regOp2);
	void RORX(int bits, X64Reg regOp, const OpArg& arg, u8 rotate);
	void PEXT(int bits, X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void PDEP(int bits, X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void MULX(int bits, X64Reg regOp1, X64Reg regOp2, const OpArg& arg);
	void BZHI(int bits, X64Reg regOp1, const OpArg& arg, X64Reg regOp2);
	void BLSR(int bits, X64Reg regOp, const OpArg& arg);
	void BLSMSK(int bits, X64Reg regOp, const OpArg& arg);
	void BLSI(int bits, X64Reg regOp, const OpArg& arg);
	void BEXTR(int bits, X64Reg regOp1, const OpArg& arg, X64Reg regOp2);
	void ANDN(int bits, X64Reg regOp1, X64Reg regOp2, const OpArg& arg);

	void RDTSC();

	// Utility functions
	// The difference between this and CALL is that this aligns the stack
	// where appropriate.
	void ABI_CallFunction(const void* func);

	void ABI_CallFunctionC16(const void* func, u16 param1);
	void ABI_CallFunctionCC16(const void* func, u32 param1, u16 param2);

	// These only support u32 parameters, but that's enough for a lot of uses.
	// These will destroy the 1 or 2 first "parameter regs".
	void ABI_CallFunctionC(const void* func, u32 param1);
	void ABI_CallFunctionCC(const void* func, u32 param1, u32 param2);
	void ABI_CallFunctionCP(const void* func, u32 param1, void* param2);
	void ABI_CallFunctionCCC(const void* func, u32 param1, u32 param2, u32 param3);
	void ABI_CallFunctionCCP(const void* func, u32 param1, u32 param2, void* param3);
	void ABI_CallFunctionCCCP(const void* func, u32 param1, u32 param2,u32 param3, void* param4);
	void ABI_CallFunctionPC(const void* func, void* param1, u32 param2);
	void ABI_CallFunctionPPC(const void* func, void* param1, void* param2, u32 param3);
	void ABI_CallFunctionAC(int bits, const void* func, const OpArg& arg1, u32 param2);
	void ABI_CallFunctionA(int bits, const void* func, const OpArg& arg1);

	// Pass a register as a parameter.
	void ABI_CallFunctionR(const void* func, X64Reg reg1);
	void ABI_CallFunctionRR(const void* func, X64Reg reg1, X64Reg reg2);

	// Helper method for the above, or can be used separately.
	void MOVTwo(int bits, X64Reg dst1, X64Reg src1, s32 offset, X64Reg dst2,X64Reg src2);

	// Saves/restores the registers and adjusts the stack to be aligned as
	// required by the ABI, where the previous alignment was as specified.
	// Push returns the size of the shadow space, i.e. the offset of the frame.
	size_t ABI_PushRegistersAndAdjustStack(BitSet32 mask, size_t rsp_alignment, size_t needed_frame_size = 0);
	void ABI_PopRegistersAndAdjustStack(BitSet32 mask, size_t rsp_alignment, size_t needed_frame_size = 0);

	// Utility to generate a call to a std::function object.
	//
	// Unfortunately, calling operator() directly is undefined behavior in C++
	// (this method might be a thunk in the case of multi-inheritance) so we
	// have to go through a trampoline function.
	template <typename T, typename... Args>
	static T CallLambdaTrampoline(const std::function<T(Args...)>* f, Args... args)
	{
		return (*f)(args...);
	}

	template <typename T, typename... Args>
	void ABI_CallLambdaC(const std::function<T(Args...)>* f, u32 p1)
	{
		auto trampoline = &XEmitter::CallLambdaTrampoline<T, Args...>;
		ABI_CallFunctionPC((void*)trampoline, const_cast<void*>((const void*)f), p1);
	}
};  // class XEmitter

class X64CodeBlock : public CodeBlock<XEmitter>
{
private:
	void PoisonMemory() override
	{
		// x86/64: 0xCC = breakpoint
		memset(region, 0xCC, region_size);
	}
};

}  // namespace