EE Int: Add EE overclocking to interpreter

PCSX2 · Nov 3, 2023 · 461f3bd · 461f3bd
1 parent ed1791a
commit 461f3bd
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Showing 4 changed files with 74 additions and 23 deletions.
diff --git a/pcsx2/Interpreter.cpp b/pcsx2/Interpreter.cpp
@@ -39,14 +39,32 @@ static fastjmp_buf intJmpBuf;
 
 static void intEventTest();
 
-u32 intGetCycles()
+void intUpdateCPUCycles()
 {
-	return cpuBlockCycles;
-}
+	const bool lowcycles = (cpuBlockCycles <= 40);
+	const s8 cyclerate = EmuConfig.Speedhacks.EECycleRate;
+	u32 scale_cycles = 0;
 
-void intSetCycles(u32 cycles)
-{
-	cpuBlockCycles = cycles;
+	if (cyclerate == 0 || lowcycles || cyclerate < -99 || cyclerate > 3)
+		scale_cycles = cpuBlockCycles >> 3;
+
+	else if (cyclerate > 1)
+		scale_cycles = cpuBlockCycles >> (2 + cyclerate);
+
+	else if (cyclerate == 1)
+		scale_cycles = (cpuBlockCycles >> 3) / 1.3f; // Adds a mild 30% increase in clockspeed for value 1.
+
+	else if (cyclerate == -1) // the mildest value which is also used by the "balanced" preset.
+		// These values were manually tuned to yield mild speedup with high compatibility
+		scale_cycles = (cpuBlockCycles <= 80 || cpuBlockCycles > 168 ? 5 : 7) * cpuBlockCycles / 32;
+
+	else
+		scale_cycles = ((5 + (-2 * (cyclerate + 1))) * cpuBlockCycles) >> 5;
+
+	// Ensure block cycle count is never less than 1.
+	cpuRegs.cycle += (scale_cycles < 1) ? 1 : scale_cycles;
+
+	cpuBlockCycles &= (1 << 3) - 1;
 }
 
 // These macros are used to assemble the repassembler functions
@@ -211,8 +229,7 @@ static __fi void _doBranch_shared(u32 tar)
 static void doBranch( u32 target )
 {
 	_doBranch_shared( target );
-	cpuRegs.cycle += cpuBlockCycles >> 3;
-	cpuBlockCycles &= (1<<3)-1;
+	intUpdateCPUCycles();
 	intEventTest();
 }
 
@@ -223,8 +240,7 @@ void intDoBranch(u32 target)
 
 	if( Cpu == &intCpu )
 	{
-		cpuRegs.cycle += cpuBlockCycles >> 3;
-		cpuBlockCycles &= (1<<3)-1;
+		intUpdateCPUCycles();
 		intEventTest();
 	}
 }

diff --git a/pcsx2/R5900.h b/pcsx2/R5900.h
@@ -220,8 +220,7 @@ alignas(16) extern tlbs tlb[48];
 
 extern bool eeEventTestIsActive;
 
-u32 intGetCycles();
-void intSetCycles(u32 cycles);
+void intUpdateCPUCycles();
 void intSetBranch();
 
 // This is a special form of the interpreter's doBranch that is run from various

diff --git a/pcsx2/VU0.cpp b/pcsx2/VU0.cpp
@@ -66,13 +66,14 @@ __fi void _vu0run(bool breakOnMbit, bool addCycles, bool sync_only) {
 		return;
 	}
 
+	if(!EmuConfig.Cpu.Recompiler.EnableEE)
+		intUpdateCPUCycles();
+
 	u32 startcycle = cpuRegs.cycle;
 	s32 runCycles  = 0x7fffffff;
 
 	if (sync_only)
 	{
-		cpuRegs.cycle += intGetCycles() >> 3;
-		intSetCycles(intGetCycles() & (1 << 3) - 1);
 		runCycles  = (s32)(cpuRegs.cycle - VU0.cycle);
 
 		if (runCycles < 0)
@@ -127,33 +128,36 @@ namespace OpcodeImpl
 
 
 void QMFC2() {
+	vu0Sync();
+
 	if (cpuRegs.code & 1) {
 		_vu0FinishMicro();
 	}
-	else
-		vu0Sync();
+
 	if (_Rt_ == 0) return;
 	cpuRegs.GPR.r[_Rt_].UD[0] = VU0.VF[_Fs_].UD[0];
 	cpuRegs.GPR.r[_Rt_].UD[1] = VU0.VF[_Fs_].UD[1];
 }
 
 void QMTC2() {
+	vu0Sync();
+
 	if (cpuRegs.code & 1) {
 		_vu0WaitMicro();
 	}
-	else
-		vu0Sync();
+
 	if (_Fs_ == 0) return;
 	VU0.VF[_Fs_].UD[0] = cpuRegs.GPR.r[_Rt_].UD[0];
 	VU0.VF[_Fs_].UD[1] = cpuRegs.GPR.r[_Rt_].UD[1];
 }
 
 void CFC2() {
+	vu0Sync();
+
 	if (cpuRegs.code & 1) {
 		_vu0FinishMicro();
 	}
-	else
-		vu0Sync();
+
 	if (_Rt_ == 0) return;
 
 	if (_Fs_ == REG_R)
@@ -171,11 +175,12 @@ void CFC2() {
 }
 
 void CTC2() {
+	vu0Sync();
+
 	if (cpuRegs.code & 1) {
 		_vu0WaitMicro();
 	}
-	else
-		vu0Sync();
+
 	if (_Fs_ == 0) return;
 
 	switch(_Fs_) {

diff --git a/pcsx2/VU0microInterp.cpp b/pcsx2/VU0microInterp.cpp
@@ -286,6 +286,37 @@ void InterpVU0::Execute(u32 cycles)
 		vu0Exec(&VU0);
 	}
 	VU0.VI[REG_TPC].UL >>= 3;
-	VU0.nextBlockCycles = (VU0.cycle - cpuRegs.cycle) + 1;
+
+	if (EmuConfig.Speedhacks.EECycleRate != 0 && (!EmuConfig.Gamefixes.VUSyncHack || EmuConfig.Speedhacks.EECycleRate < 0))
+	{
+		u32 cycle_change = VU0.cycle - startcycles;
+		VU0.cycle -= cycle_change;
+		switch (std::min(static_cast<int>(EmuConfig.Speedhacks.EECycleRate), static_cast<int>(cycle_change)))
+		{
+			case -3: // 50%
+				cycle_change *= 2.0f;
+				break;
+			case -2: // 60%
+				cycle_change *= 1.6666667f;
+				break;
+			case -1: // 75%
+				cycle_change *= 1.3333333f;
+				break;
+			case 1: // 130%
+				cycle_change /= 1.3f;
+				break;
+			case 2: // 180%
+				cycle_change /= 1.8f;
+				break;
+			case 3: // 300%
+				cycle_change /= 3.0f;
+				break;
+			default:
+				break;
+		}
+		VU0.cycle += cycle_change;
+	}
 	fesetround(originalRounding);
+
+	VU0.nextBlockCycles = (VU0.cycle - cpuRegs.cycle) + 1;
 }