dolphin/Source/Core/DSPCore/Src/DSPIntCCUtil.cpp

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// Copyright (C) 2003-2009 Dolphin Project.
// 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, version 2.0.
// 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 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
// Additional copyrights go to Duddie and Tratax (c) 2004
// HELPER FUNCTIONS
#include "DSPIntCCUtil.h"
#include "DSPCore.h"
#include "DSPInterpreter.h"
namespace DSPInterpreter {
void Update_SR_Register64(s64 _Value)
{
g_dsp.r[DSP_REG_SR] &= ~SR_CMP_MASK;
if (_Value < 0)
{
g_dsp.r[DSP_REG_SR] |= SR_SIGN;
}
if (_Value == 0)
{
g_dsp.r[DSP_REG_SR] |= SR_ARITH_ZERO;
}
// weird
if ((_Value >> 62) == 0)
{
g_dsp.r[DSP_REG_SR] |= 0x20;
}
}
void Update_SR_Register16(s16 _Value)
{
g_dsp.r[DSP_REG_SR] &= ~SR_CMP_MASK;
if (_Value < 0)
{
g_dsp.r[DSP_REG_SR] |= SR_SIGN;
}
if (_Value == 0)
{
g_dsp.r[DSP_REG_SR] |= SR_ARITH_ZERO;
}
// weird
if ((_Value >> 14) == 0)
{
g_dsp.r[DSP_REG_SR] |= 0x20;
}
}
void Update_SR_LZ(s64 value) {
if (value == 0)
{
g_dsp.r[DSP_REG_SR] |= SR_LOGIC_ZERO;
}
else
{
g_dsp.r[DSP_REG_SR] &= ~SR_LOGIC_ZERO;
}
}
int GetMultiplyModifier()
{
if (g_dsp.r[DSP_REG_SR] & SR_MUL_MODIFY)
return 1;
else
return 2;
}
inline bool isCarry() {
return (g_dsp.r[DSP_REG_SR] & SR_CARRY) ? true : false;
}
inline bool isSign() {
return ((g_dsp.r[DSP_REG_SR] & SR_2) != (g_dsp.r[DSP_REG_SR] & SR_SIGN));
}
inline bool isZero() {
return (g_dsp.r[DSP_REG_SR] & SR_ARITH_ZERO) ? true : false;
}
//see gdsp_registers.h for flags
bool CheckCondition(u8 _Condition)
{
switch (_Condition & 0xf)
{
case 0x0: //NS - NOT SIGN
return !isSign();
case 0x1: // S - SIGN
return isSign();
case 0x2: // G - GREATER
return !isSign() && !isZero();
case 0x3: // LE - LESS EQUAL
return isSign() || isZero();
case 0x4: // NZ - NOT ZERO
return !isZero();
case 0x5: // Z - ZERO
return isZero();
case 0x6: // L - LESS
// Should be that once we set 0x01
return !isCarry();
// if (isSign())
case 0x7: // GE - GREATER EQUAL
// Should be that once we set 0x01
return isCarry();
// if (! isSign() || isZero())
case 0xc: // LNZ - LOGIC NOT ZERO
return !(g_dsp.r[DSP_REG_SR] & SR_LOGIC_ZERO);
case 0xd: // LZ - LOGIC ZERO
return (g_dsp.r[DSP_REG_SR] & SR_LOGIC_ZERO) != 0;
case 0xf: // Empty - always true.
return true;
default:
ERROR_LOG(DSPLLE, "Unknown condition check: 0x%04x\n", _Condition & 0xf);
return false;
}
}
} // namespace