forked from dolphin-emu/dolphin
04105baf4e
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3573 8ced0084-cf51-0410-be5f-012b33b47a6e
141 lines
3.0 KiB
C++
141 lines
3.0 KiB
C++
// 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
|