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Store an inverted copy of lastOCfactor.

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The inverse operation is more common, especially when games check the
timer rapidly. So we do the division once and store the inverted copy.
This commit is contained in:
Scott Mansell 2016-03-24 04:42:13 +13:00
parent 407f86e01a
commit 27beef1ff4
3 changed files with 14 additions and 8 deletions
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18
Source/Core/Core/CoreTiming.cpp
View File

@ -50,7 +50,8 @@ static Common::FifoQueue<BaseEvent, false> tsQueue;
// event pools
static Event *eventPool = nullptr;
float g_lastOCFactor;
static float s_lastOCFactor;
float g_lastOCFactor_inverted;
int g_slicelength;
static int maxslicelength = MAX_SLICE_LENGTH;
@ -94,12 +95,12 @@ static void EmptyTimedCallback(u64 userdata, int cyclesLate) {}
// but the effect is largely the same.
static int DowncountToCycles(int downcount)
{
return (int)(downcount / g_lastOCFactor);
return (int)(downcount * g_lastOCFactor_inverted);
}
static int CyclesToDowncount(int cycles)
{
return (int)(cycles * g_lastOCFactor);
return (int)(cycles * s_lastOCFactor);
}
int RegisterEvent(const std::string& name, TimedCallback callback)
@ -135,7 +136,8 @@ void UnregisterAllEvents()
void Init()
{
g_lastOCFactor = SConfig::GetInstance().m_OCEnable ? SConfig::GetInstance().m_OCFactor : 1.0f;
s_lastOCFactor = SConfig::GetInstance().m_OCEnable ? SConfig::GetInstance().m_OCFactor : 1.0f;
g_lastOCFactor_inverted = 1.0f / s_lastOCFactor;
PowerPC::ppcState.downcount = CyclesToDowncount(maxslicelength);
g_slicelength = maxslicelength;
g_globalTimer = 0;
@ -204,7 +206,10 @@ void DoState(PointerWrap &p)
p.Do(fakeDecStartTicks);
p.Do(g_fakeTBStartValue);
p.Do(g_fakeTBStartTicks);
p.Do(g_lastOCFactor);
p.Do(s_lastOCFactor);
if (p.GetMode() == PointerWrap::MODE_READ)
g_lastOCFactor_inverted = 1.0f / s_lastOCFactor;
p.DoMarker("CoreTimingData");
MoveEvents();
@ -418,7 +423,8 @@ void Advance()
int cyclesExecuted = g_slicelength - DowncountToCycles(PowerPC::ppcState.downcount);
g_globalTimer += cyclesExecuted;
g_lastOCFactor = SConfig::GetInstance().m_OCEnable ? SConfig::GetInstance().m_OCFactor : 1.0f;
s_lastOCFactor = SConfig::GetInstance().m_OCEnable ? SConfig::GetInstance().m_OCFactor : 1.0f;
g_lastOCFactor_inverted = 1.0f / s_lastOCFactor;
PowerPC::ppcState.downcount = CyclesToDowncount(g_slicelength);
globalTimerIsSane = true;

2
Source/Core/Core/CoreTiming.h
View File

@ -30,7 +30,7 @@ extern s64 g_globalTimer;
extern u64 g_fakeTBStartValue;
extern u64 g_fakeTBStartTicks;
extern int g_slicelength;
extern float g_lastOCFactor;
extern float g_lastOCFactor_inverted;
void Init();
void Shutdown();

2
Source/Core/Core/PowerPC/Jit64/Jit_SystemRegisters.cpp
View File

@ -285,7 +285,7 @@ void Jit64::mfspr(UGeckoInstruction inst)
// cost of calling out to C for this is actually significant.
// Scale downcount by the CPU overclocking factor.
CVTSI2SS(XMM0, PPCSTATE(downcount));
DIVSS(XMM0, M(&CoreTiming::g_lastOCFactor));
MULSS(XMM0, M(&CoreTiming::g_lastOCFactor_inverted));
CVTSS2SI(RDX, R(XMM0)); // RDX is downcount scaled by the overclocking factor
MOV(32, R(RAX), M(&CoreTiming::g_slicelength));
SUB(64, R(RAX), R(RDX)); // cycles since the last CoreTiming::Advance() event is (slicelength - Scaled_downcount)