/*====================================================================

   filename:     gdsp_opcodes_helper.h
   project:      GameCube DSP Tool (gcdsp)
   created:      2005.03.04
   mail:		  duddie@walla.com

   Copyright (c) 2005 Duddie

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 2
   of the License, or (at your option) any later version.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

   ====================================================================*/

#ifndef _DSP_INT_UTIL_H
#define _DSP_INT_UTIL_H

#include "Common.h"

#include "DSPInterpreter.h"
#include "DSPCore.h"
#include "DSPMemoryMap.h"
#include "DSPStacks.h"


// ---------------------------------------------------------------------------------------
// --- SR
// ---------------------------------------------------------------------------------------

inline void dsp_SR_set_flag(int flag)
{
	g_dsp.r.sr |= flag;
}

inline bool dsp_SR_is_flag_set(int flag)
{
	return (g_dsp.r.sr & flag) != 0;
}

// ---------------------------------------------------------------------------------------
// --- AR increments, decrements
// ---------------------------------------------------------------------------------------

inline u16 dsp_increase_addr_reg(u16 reg, s16 _ix)
{
	u32 ar = g_dsp.r.ar[reg];
	u32 wr = g_dsp.r.wr[reg];
	s32 ix = _ix;
	
	u32 mx = (wr | 1) << 1;
	u32 nar = ar + ix;
	u32 dar = (nar ^ ar ^ ix) & mx;

	if (ix >= 0)
	{
		if (dar > wr) //overflow
			nar -= wr + 1;
	}
	else
	{
		if ((((nar + wr + 1) ^ nar) & dar) <= wr) //underflow or below min for mask
			nar += wr + 1;
	}
	return nar;
}

inline u16 dsp_decrease_addr_reg(u16 reg, s16 _ix) 
{
	u32 ar = g_dsp.r.ar[reg];
	u32 wr = g_dsp.r.wr[reg];
	s32 ix = _ix;

	u32 mx = (wr | 1) << 1;
	u32 nar = ar - ix;
	u32 dar = (nar ^ ar ^ ~ix) & mx;

	if ((u32)ix > 0xFFFF8000) //(ix < 0 && ix != -0x8000)
	{
		if (dar > wr) //overflow
			nar -= wr + 1;
	}
	else
	{
		if ((((nar + wr + 1) ^ nar) & dar) <= wr) //underflow or below min for mask
			nar += wr + 1;
	}
	return nar;
}

inline u16 dsp_increment_addr_reg(u16 reg) 
{
	u32 ar = g_dsp.r.ar[reg];
	u32 wr = g_dsp.r.wr[reg];

	u32 nar = ar + 1;
	
	if ((nar ^ ar) > ((wr | 1) << 1))
		nar -= wr + 1;
	return nar;
}

inline u16 dsp_decrement_addr_reg(u16 reg) 
{
	u32 ar = g_dsp.r.ar[reg];
	u32 wr = g_dsp.r.wr[reg];
	
	u32 nar = ar + wr;

	if (((nar ^ ar) & ((wr | 1) << 1)) > wr)
		nar -= wr + 1;
	return nar;
}


// ---------------------------------------------------------------------------------------
// --- reg
// ---------------------------------------------------------------------------------------

inline u16 dsp_op_read_reg(int reg)
{
	switch (reg & 0x1f) {
	case DSP_REG_ST0:
	case DSP_REG_ST1:
	case DSP_REG_ST2:
	case DSP_REG_ST3:
		return dsp_reg_load_stack(reg - DSP_REG_ST0);
	case DSP_REG_AR0:
	case DSP_REG_AR1:
	case DSP_REG_AR2:
	case DSP_REG_AR3:
		return g_dsp.r.ar[reg - DSP_REG_AR0];
	case DSP_REG_IX0:
	case DSP_REG_IX1:
	case DSP_REG_IX2:
	case DSP_REG_IX3:
		return g_dsp.r.ix[reg - DSP_REG_IX0];
	case DSP_REG_WR0:
	case DSP_REG_WR1:
	case DSP_REG_WR2:
	case DSP_REG_WR3:
		return g_dsp.r.wr[reg - DSP_REG_WR0];
	case DSP_REG_ACH0:
	case DSP_REG_ACH1:
		return g_dsp.r.ac[reg - DSP_REG_ACH0].h;
	case DSP_REG_CR:     return g_dsp.r.cr;
	case DSP_REG_SR:     return g_dsp.r.sr;
	case DSP_REG_PRODL:  return g_dsp.r.prod.l;
	case DSP_REG_PRODM:  return g_dsp.r.prod.m;
	case DSP_REG_PRODH:  return g_dsp.r.prod.h;
	case DSP_REG_PRODM2: return g_dsp.r.prod.m2;
	case DSP_REG_AXL0:
	case DSP_REG_AXL1:
		return g_dsp.r.ax[reg - DSP_REG_AXL0].l;
	case DSP_REG_AXH0:
	case DSP_REG_AXH1:
		return g_dsp.r.ax[reg - DSP_REG_AXH0].h;
	case DSP_REG_ACL0:
	case DSP_REG_ACL1:
		return g_dsp.r.ac[reg - DSP_REG_ACL0].l;
	case DSP_REG_ACM0:
	case DSP_REG_ACM1:
		return g_dsp.r.ac[reg - DSP_REG_ACM0].m;
	default:
		_assert_msg_(DSP_INT, 0, "cannot happen");
		return 0;
	}
}

inline void dsp_op_write_reg(int reg, u16 val)
{
	switch (reg & 0x1f) {
	// 8-bit sign extended registers. Should look at prod.h too...
	case DSP_REG_ACH0:
	case DSP_REG_ACH1:
		// sign extend from the bottom 8 bits.
		g_dsp.r.ac[reg-DSP_REG_ACH0].h = (u16)(s16)(s8)(u8)val;
		break;

	// Stack registers.
	case DSP_REG_ST0:
	case DSP_REG_ST1:
	case DSP_REG_ST2:
	case DSP_REG_ST3:
		dsp_reg_store_stack(reg - DSP_REG_ST0, val);
		break;

	case DSP_REG_AR0:
	case DSP_REG_AR1:
	case DSP_REG_AR2:
	case DSP_REG_AR3:
		g_dsp.r.ar[reg - DSP_REG_AR0] = val;
		break;
	case DSP_REG_IX0:
	case DSP_REG_IX1:
	case DSP_REG_IX2:
	case DSP_REG_IX3:
		g_dsp.r.ix[reg - DSP_REG_IX0] = val;
		break;
	case DSP_REG_WR0:
	case DSP_REG_WR1:
	case DSP_REG_WR2:
	case DSP_REG_WR3:
		g_dsp.r.wr[reg - DSP_REG_WR0] = val;
		break;
	case DSP_REG_CR:     g_dsp.r.cr = val; break;
	case DSP_REG_SR:     g_dsp.r.sr = val; break;
	case DSP_REG_PRODL:  g_dsp.r.prod.l = val; break;
	case DSP_REG_PRODM:  g_dsp.r.prod.m = val; break;
	case DSP_REG_PRODH:  g_dsp.r.prod.h = val; break;
	case DSP_REG_PRODM2: g_dsp.r.prod.m2 = val; break;
	case DSP_REG_AXL0:
	case DSP_REG_AXL1:
		g_dsp.r.ax[reg - DSP_REG_AXL0].l = val;
		break;
	case DSP_REG_AXH0:
	case DSP_REG_AXH1:
		g_dsp.r.ax[reg - DSP_REG_AXH0].h = val;
		break;
	case DSP_REG_ACL0:
	case DSP_REG_ACL1:
		g_dsp.r.ac[reg - DSP_REG_ACL0].l = val;
		break;
	case DSP_REG_ACM0:
	case DSP_REG_ACM1:
		g_dsp.r.ac[reg - DSP_REG_ACM0].m = val;
		break;
	}
}

inline void dsp_conditional_extend_accum(int reg) 
{
	switch (reg) 
	{
	case DSP_REG_ACM0:
	case DSP_REG_ACM1:
		if (g_dsp.r.sr & SR_40_MODE_BIT)
		{
			// Sign extend into whole accum.
			u16 val = g_dsp.r.ac[reg-DSP_REG_ACM0].m;
			g_dsp.r.ac[reg - DSP_REG_ACM0].h = (val & 0x8000) ? 0xFFFF : 0x0000;
			g_dsp.r.ac[reg - DSP_REG_ACM0].l = 0;
		}
	}
}

// ---------------------------------------------------------------------------------------
// --- prod
// ---------------------------------------------------------------------------------------

inline s64 dsp_get_long_prod()
{
#if PROFILE
	ProfilerAddDelta(g_dsp.err_pc, 1);
#endif

	s64 val   = (s8)(u8)g_dsp.r.prod.h;
	val <<= 32;
	s64 low_prod  = g_dsp.r.prod.m;
	low_prod += g_dsp.r.prod.m2;
	low_prod <<= 16;
	low_prod |= g_dsp.r.prod.l;
	val += low_prod;
	return val;
}

inline s64 dsp_get_long_prod_round_prodl()
{
	s64 prod = dsp_get_long_prod();

	if (prod & 0x10000)
		prod = (prod + 0x8000) & ~0xffff;
	else
		prod = (prod + 0x7fff) & ~0xffff;

	return prod;
}

// For accurate emulation, this is wrong - but the real prod registers behave
// in completely bizarre ways. Not needed to emulate them correctly for game ucodes.
inline void dsp_set_long_prod(s64 val)
{
#if PROFILE
	ProfilerAddDelta(g_dsp.err_pc, 1);
#endif

	g_dsp.r.prod.l = (u16)val;
	val >>= 16;
	g_dsp.r.prod.m = (u16)val;
	val >>= 16;
	g_dsp.r.prod.h = /*(s16)(s8)*/(u8)val;//todo: check expansion
	g_dsp.r.prod.m2 = 0;
}

// ---------------------------------------------------------------------------------------
// --- ACC - main accumulators (40-bit)
// ---------------------------------------------------------------------------------------

inline s64 dsp_get_long_acc(int reg)
{
#if PROFILE
	ProfilerAddDelta(g_dsp.err_pc, 1);
#endif

	s64 high = (s64)(s8)g_dsp.r.ac[reg].h << 32;
	u32 mid_low = ((u32)g_dsp.r.ac[reg].m << 16) | g_dsp.r.ac[reg].l;
	return high | mid_low;
}

inline void dsp_set_long_acc(int _reg, s64 val)
{
#if PROFILE
	ProfilerAddDelta(g_dsp.err_pc, 1);
#endif

	g_dsp.r.ac[_reg].l = (u16)val;
	val >>= 16;
	g_dsp.r.ac[_reg].m = (u16)val;
	val >>= 16;
	g_dsp.r.ac[_reg].h = (u16)(s16)(s8)(u8)val;
}

inline s64 dsp_convert_long_acc(s64 val) // s64 -> s40
{
	return ((s64)(s8)(val >> 32))<<32 | (u32)val;
}

inline s64 dsp_round_long_acc(s64 val)
{
	if (val & 0x10000)
		val = (val + 0x8000) & ~0xffff;
	else
		val = (val + 0x7fff) & ~0xffff;

	return val;
}

inline s16 dsp_get_acc_l(int _reg)
{
	return g_dsp.r.ac[_reg].l;
}

inline s16 dsp_get_acc_m(int _reg)
{
	return g_dsp.r.ac[_reg].m;
}

inline s16 dsp_get_acc_h(int _reg)
{
	return g_dsp.r.ac[_reg].h;
}

// ---------------------------------------------------------------------------------------
// --- AX - extra accumulators (32-bit)
// ---------------------------------------------------------------------------------------

inline s32 dsp_get_long_acx(int _reg)
{
#if PROFILE
	ProfilerAddDelta(g_dsp.err_pc, 1);
#endif

	return ((u32)g_dsp.r.ax[_reg].h << 16) | g_dsp.r.ax[_reg].l;
}

inline s16 dsp_get_ax_l(int _reg)
{
	return (s16)g_dsp.r.ax[_reg].l;
}

inline s16 dsp_get_ax_h(int _reg)
{
	return (s16)g_dsp.r.ax[_reg].h;
}

#endif