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187 lines
3.1 KiB
C++
187 lines
3.1 KiB
C++
// Copyright 2009 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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//
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// Additional copyrights go to Duddie and Tratax (c) 2004
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// HELPER FUNCTIONS
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#include "Core/DSP/DSPCore.h"
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#include "Core/DSP/DSPIntCCUtil.h"
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#include "Core/DSP/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.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.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.sr |= SR_OVERFLOW;
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g_dsp.r.sr |= SR_OVERFLOW_STICKY;
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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.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.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.sr |= SR_OVER_S32;
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}
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// 0x20 - Checks if top bits of m are equal
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if (((_Value & 0xc0000000) == 0) || ((_Value & 0xc0000000) == 0xc0000000))
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{
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g_dsp.r.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.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.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.sr |= SR_OVERFLOW;
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g_dsp.r.sr |= SR_OVERFLOW_STICKY;
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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.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.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.sr |= SR_OVER_S32;
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}
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// 0x20 - Checks if top bits of m are equal
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if ((((u16)_Value >> 14) == 0) || (((u16)_Value >> 14) == 3))
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{
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g_dsp.r.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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{
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if (value == true)
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g_dsp.r.sr |= SR_LOGIC_ZERO;
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else
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g_dsp.r.sr &= ~SR_LOGIC_ZERO;
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}
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static bool IsCarry()
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{
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return (g_dsp.r.sr & SR_CARRY) != 0;
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}
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static bool IsOverflow()
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{
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return (g_dsp.r.sr & SR_OVERFLOW) != 0;
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}
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static bool IsOverS32()
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{
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return (g_dsp.r.sr & SR_OVER_S32) != 0;
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}
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static bool IsLess()
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{
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return (!(g_dsp.r.sr & SR_OVERFLOW) != !(g_dsp.r.sr & SR_SIGN));
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}
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static bool IsZero()
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{
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return (g_dsp.r.sr & SR_ARITH_ZERO) != 0;
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}
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static bool IsLogicZero()
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{
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return (g_dsp.r.sr & SR_LOGIC_ZERO) != 0;
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}
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static bool IsConditionA()
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{
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return (((g_dsp.r.sr & SR_OVER_S32) || (g_dsp.r.sr & SR_TOP2BITS)) && !(g_dsp.r.sr & SR_ARITH_ZERO)) != 0;
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}
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//see DSPCore.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 0xf: // Always true.
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return true;
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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 0x8: // ? - Not over s32
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return !IsOverS32();
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case 0x9: // ? - Over s32
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return IsOverS32();
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case 0xa: // ?
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return IsConditionA();
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case 0xb: // ?
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return !IsConditionA();
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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 0xe: // 0 - Overflow
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return IsOverflow();
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default:
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return true;
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}
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}
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} // namespace
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