159 lines
3.3 KiB
C++
159 lines
3.3 KiB
C++
// Copyright (C) 2003-2009 Dolphin Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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// Additional copyrights go to Duddie and Tratax (c) 2004
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// HELPER FUNCTIONS
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#include "gdsp_condition_codes.h"
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#include "gdsp_interpreter.h"
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#include "DSPInterpreter.h"
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namespace DSPInterpreter {
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void Update_SR_Register64(s64 _Value)
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{
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g_dsp.r[DSP_REG_SR] &= ~SR_CMP_MASK;
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if (_Value < 0)
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{
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g_dsp.r[DSP_REG_SR] |= 0x8;
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}
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if (_Value == 0)
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{
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g_dsp.r[DSP_REG_SR] |= 0x4;
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}
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// weird
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if ((_Value >> 62) == 0)
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{
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g_dsp.r[DSP_REG_SR] |= 0x20;
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}
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}
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void Update_SR_Register16(s16 _Value)
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{
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g_dsp.r[DSP_REG_SR] &= ~SR_CMP_MASK;
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if (_Value < 0)
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{
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g_dsp.r[DSP_REG_SR] |= 0x8;
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}
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if (_Value == 0)
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{
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g_dsp.r[DSP_REG_SR] |= 0x4;
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}
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// weird
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if ((_Value >> 14) == 0)
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{
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g_dsp.r[DSP_REG_SR] |= 0x20;
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}
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}
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// If this always returns 1, Hermes' demo sounds better.
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// However, most AX games are negatively affected.
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int GetMultiplyModifier()
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{
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if (g_dsp.r[DSP_REG_SR] & (1 << 13))
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return 1;
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else
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return 2;
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}
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// 0x02 - overflow????
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// 0x04 - Zero bit
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// 0x08 - Sign bit
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// 0x40 - Logical Zero bit
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bool CheckCondition(u8 _Condition)
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{
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bool taken = false;
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switch (_Condition & 0xf)
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{
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case 0x0: //NS - NOT SIGN
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if ((!(g_dsp.r[DSP_REG_SR] & 0x02)) && (!(g_dsp.r[DSP_REG_SR] & 0x08)))
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taken = true;
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break;
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case 0x1: // S - SIGN
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if ((!(g_dsp.r[DSP_REG_SR] & 0x02)) && (g_dsp.r[DSP_REG_SR] & 0x08))
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taken = true;
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break;
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case 0x2: // G - GREATER
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if ((!(g_dsp.r[DSP_REG_SR] & 0x02)) && (!(g_dsp.r[DSP_REG_SR] & 0x08)) && !((g_dsp.r[DSP_REG_SR] & 0x04))) // gets zelda stuck
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taken = true;
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break;
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case 0x3: // LE - LESS EQUAL
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if ((!(g_dsp.r[DSP_REG_SR] & 0x02)) && ((g_dsp.r[DSP_REG_SR] & 0x08) || (g_dsp.r[DSP_REG_SR] & 0x04)))
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taken = true;
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break;
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case 0x4: // NZ - NOT ZERO
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if (!(g_dsp.r[DSP_REG_SR] & 0x04))
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taken = true;
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break;
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case 0x5: // Z - ZERO
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if (g_dsp.r[DSP_REG_SR] & 0x04)
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taken = true;
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break;
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case 0x6: // L - LESS
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if (!(g_dsp.r[DSP_REG_SR] & 0x02) && (g_dsp.r[DSP_REG_SR] & 0x08))
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taken = true;
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break;
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case 0x7: // GE - GREATER EQUAL
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if ((!(g_dsp.r[DSP_REG_SR] & 0x02)) && (!(g_dsp.r[DSP_REG_SR] & 0x08) || (g_dsp.r[DSP_REG_SR] & 0x04)))
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taken = true;
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break;
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case 0xc: // LNZ - LOGIC NOT ZERO
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if (!(g_dsp.r[DSP_REG_SR] & 0x40))
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taken = true;
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break;
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case 0xd: // LZ - LOGIC ZERO
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if (g_dsp.r[DSP_REG_SR] & 0x40)
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taken = true;
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break;
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case 0xf: // Empty
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taken = true;
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break;
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default:
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ERROR_LOG(DSPLLE, "Unknown condition check: 0x%04x\n", _Condition & 0xf);
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break;
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}
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return taken;
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}
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} // namespace
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