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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************

    ppcfe.h

    Front-end for PowerPC recompiler

***************************************************************************/

#ifndef __PPCFE_H__
#define __PPCFE_H__

#include "ppc.h"
#include "cpu/drcfe.h"


//**************************************************************************
//  MACROS
//**************************************************************************

// register flags 0
#define REGFLAG_R(n)                    (1 << (n))
#define REGFLAG_RZ(n)                   (((n) == 0) ? 0 : REGFLAG_R(n))

// register flags 1
#define REGFLAG_FR(n)                   (1 << (n))

// register flags 2
#define REGFLAG_CR(n)                   (0xf0000000 >> (4 * (n)))
#define REGFLAG_CR_BIT(n)               (0x80000000 >> (n))

// register flags 3
#define REGFLAG_XER_CA                  (1 << 0)
#define REGFLAG_XER_OV                  (1 << 1)
#define REGFLAG_XER_SO                  (1 << 2)
#define REGFLAG_XER_COUNT               (1 << 3)
#define REGFLAG_CTR                     (1 << 4)
#define REGFLAG_LR                      (1 << 5)
#define REGFLAG_FPSCR(n)                (1 << (6 + (n)))



//**************************************************************************
//  TYPE DEFINITIONS
//**************************************************************************

class ppc_frontend : public drc_frontend
{
public:
	// construction/destruction
	ppc_frontend(ppc_device *ppc, UINT32 window_start, UINT32 window_end, UINT32 max_sequence);

protected:
	// required overrides
	virtual bool describe(opcode_desc &desc, const opcode_desc *prev);

private:
	// inlines
	UINT32 compute_spr(UINT32 spr) const { return ((spr >> 5) | (spr << 5)) & 0x3ff; }
	bool is_403_class() const { return (m_ppc->m_flavor == ppc_device::PPC_MODEL_403GA || m_ppc->m_flavor == ppc_device::PPC_MODEL_403GB || m_ppc->m_flavor == ppc_device::PPC_MODEL_403GC || m_ppc->m_flavor == ppc_device::PPC_MODEL_403GCX || m_ppc->m_flavor == ppc_device::PPC_MODEL_405GP); }
	bool is_601_class() const { return (m_ppc->m_flavor == ppc_device::PPC_MODEL_601); }
	bool is_602_class() const { return (m_ppc->m_flavor == ppc_device::PPC_MODEL_602); }
	bool is_603_class() const { return (m_ppc->m_flavor == ppc_device::PPC_MODEL_603 || m_ppc->m_flavor == ppc_device::PPC_MODEL_603E || m_ppc->m_flavor == ppc_device::PPC_MODEL_603EV || m_ppc->m_flavor == ppc_device::PPC_MODEL_603R); }

	// internal helpers
	bool describe_13(UINT32 op, opcode_desc &desc, const opcode_desc *prev);
	bool describe_1f(UINT32 op, opcode_desc &desc, const opcode_desc *prev);
	bool describe_3b(UINT32 op, opcode_desc &desc, const opcode_desc *prev);
	bool describe_3f(UINT32 op, opcode_desc &desc, const opcode_desc *prev);

	// internal state
	ppc_device *m_ppc;
};


#endif /* __PPCFE_H__ */