178 lines
3.6 KiB
C++
178 lines
3.6 KiB
C++
// Copyright (C) 2003 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, bool carry, bool overflow)
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{
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g_dsp.r[DSP_REG_SR] &= ~SR_CMP_MASK;
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// 0x01
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if (carry)
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{
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g_dsp.r[DSP_REG_SR] |= SR_CARRY;
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}
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// 0x02 and 0x80
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if (overflow)
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{
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g_dsp.r[DSP_REG_SR] |= SR_OVERFLOW;
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g_dsp.r[DSP_REG_SR] |= SR_OVERFLOW_SPECIAL;
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}
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// 0x04
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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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// 0x08
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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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// 0x10
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if (_Value != (s32)_Value)
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{
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g_dsp.r[DSP_REG_SR] |= SR_OVER_S32;
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}
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// 0x20 - Checks if top bits of m are equal, what is it good for?
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if (((_Value & 0xc0000000) == 0) || ((_Value & 0xc0000000) == 0xc0000000))
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{
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g_dsp.r[DSP_REG_SR] |= SR_TOP2BITS;
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}
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}
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void Update_SR_Register16(s16 _Value, bool carry, bool overflow, bool overS32)
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{
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g_dsp.r[DSP_REG_SR] &= ~SR_CMP_MASK;
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// 0x01
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if (carry)
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{
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g_dsp.r[DSP_REG_SR] |= SR_CARRY;
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}
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// 0x02 and 0x80
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if (overflow)
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{
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g_dsp.r[DSP_REG_SR] |= SR_OVERFLOW;
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g_dsp.r[DSP_REG_SR] |= SR_OVERFLOW_SPECIAL;
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}
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// 0x04
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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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// 0x08
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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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// 0x10
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if (overS32)
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{
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g_dsp.r[DSP_REG_SR] |= SR_OVER_S32;
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}
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// 0x20 - Checks if top bits of m are equal, what is it good for?
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if ((((u16)_Value >> 14) == 0) || (((u16)_Value >> 14) == 3))
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{
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g_dsp.r[DSP_REG_SR] |= SR_TOP2BITS;
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}
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}
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void Update_SR_LZ(bool value) {
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if (value == true)
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g_dsp.r[DSP_REG_SR] |= SR_LOGIC_ZERO;
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else
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g_dsp.r[DSP_REG_SR] &= ~SR_LOGIC_ZERO;
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}
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inline int GetMultiplyModifier()
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{
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return (g_dsp.r[DSP_REG_SR] & SR_MUL_MODIFY)?1:2;
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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 isLess() {
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return ((g_dsp.r[DSP_REG_SR] & SR_OVERFLOW) != (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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inline bool isLogicZero() {
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return (g_dsp.r[DSP_REG_SR] & SR_LOGIC_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: // GE - Greater Equal
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return !isLess();
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case 0x1: // L - Less
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return isLess();
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case 0x2: // G - Greater
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return !isLess() && !isZero();
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case 0x3: // LE - Less Equal
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return isLess() || 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: // NC - Not carry
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return !isCarry();
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case 0x7: // C - Carry
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return isCarry();
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case 0xc: // LNZ - Logic Not Zero
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return !isLogicZero();
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case 0xd: // LZ - Logic Zero
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return isLogicZero();
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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", _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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