141 lines
2.9 KiB
C++
141 lines
2.9 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 "DSPIntCCUtil.h"
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#include "DSPCore.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] |= SR_SIGN;
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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] |= SR_ARITH_ZERO;
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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] |= SR_SIGN;
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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] |= SR_ARITH_ZERO;
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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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void Update_SR_LZ(s64 value) {
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if (value == 0)
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{
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g_dsp.r[DSP_REG_SR] |= SR_LOGIC_ZERO;
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}
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else
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{
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g_dsp.r[DSP_REG_SR] &= ~SR_LOGIC_ZERO;
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}
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}
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int GetMultiplyModifier()
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{
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if (g_dsp.r[DSP_REG_SR] & SR_MUL_MODIFY)
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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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inline bool isCarry() {
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return (g_dsp.r[DSP_REG_SR] & SR_CARRY) ? true : false;
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}
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inline bool isSign() {
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return ((g_dsp.r[DSP_REG_SR] & SR_2) != (g_dsp.r[DSP_REG_SR] & SR_SIGN));
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}
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inline bool isZero() {
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return (g_dsp.r[DSP_REG_SR] & SR_ARITH_ZERO) ? true : false;
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}
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//see gdsp_registers.h for flags
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bool CheckCondition(u8 _Condition)
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{
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switch (_Condition & 0xf)
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{
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case 0x0: //NS - NOT SIGN
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return !isSign();
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case 0x1: // S - SIGN
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return isSign();
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case 0x2: // G - GREATER
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return !isSign() && !isZero();
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case 0x3: // LE - LESS EQUAL
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return isSign() || isZero();
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case 0x4: // NZ - NOT ZERO
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return !isZero();
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case 0x5: // Z - ZERO
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return isZero();
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case 0x6: // L - LESS
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// Should be that once we set 0x01
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return !isCarry();
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// if (isSign())
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case 0x7: // GE - GREATER EQUAL
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// Should be that once we set 0x01
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return isCarry();
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// if (! isSign() || isZero())
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case 0xc: // LNZ - LOGIC NOT ZERO
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return !(g_dsp.r[DSP_REG_SR] & SR_LOGIC_ZERO);
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case 0xd: // LZ - LOGIC ZERO
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return (g_dsp.r[DSP_REG_SR] & SR_LOGIC_ZERO) != 0;
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case 0xf: // Empty - always true.
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return true;
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default:
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ERROR_LOG(DSPLLE, "Unknown condition check: 0x%04x\n", _Condition & 0xf);
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return false;
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}
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}
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} // namespace
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