From 50872438e9f71a70240581fd1033c8e89a0ff842 Mon Sep 17 00:00:00 2001
From: refractionpcsx2 <refraction@gmail.com>
Date: Thu, 2 Nov 2023 11:14:28 +0000
Subject: [PATCH] VU: scale VU0 cycle rate with EE

Also fix cycle underflow issue
---
 pcsx2/x86/microVU.h           |  2 +-
 pcsx2/x86/microVU_Compile.inl | 26 ++++++++++++++++++++++++++
 pcsx2/x86/microVU_Execute.inl |  4 ++--
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/pcsx2/x86/microVU.h b/pcsx2/x86/microVU.h
index 469b3d3e46..8c5ff8efdc 100644
--- a/pcsx2/x86/microVU.h
+++ b/pcsx2/x86/microVU.h
@@ -135,7 +135,7 @@ struct microVU
 	u32 p;            // Holds current P instance index
 	u32 q;            // Holds current Q instance index
 	u32 totalCycles;  // Total Cycles that mVU is expected to run for
-	u32 cycles;       // Cycles Counter
+	s32 cycles;       // Cycles Counter
 
 	VURegs& regs() const { return ::vuRegs[index]; }
 
diff --git a/pcsx2/x86/microVU_Compile.inl b/pcsx2/x86/microVU_Compile.inl
index 9629804fb8..9c2b8db67c 100644
--- a/pcsx2/x86/microVU_Compile.inl
+++ b/pcsx2/x86/microVU_Compile.inl
@@ -464,6 +464,32 @@ void mVUtestCycles(microVU& mVU, microFlagCycles& mFC)
 {
 	iPC = mVUstartPC;
 
+	if (isVU0 && EmuConfig.Speedhacks.EECycleRate != 0)
+	{
+		switch (std::min(static_cast<int>(EmuConfig.Speedhacks.EECycleRate), static_cast<int>(mVUcycles)))
+		{
+			case -3: // 50%
+				mVUcycles *= 2.0f;
+				break;
+			case -2: // 60%
+				mVUcycles *= 1.6666667f;
+				break;
+			case -1: // 75%
+				mVUcycles *= 1.3333333f;
+				break;
+			case 1: // 130%
+				mVUcycles /= 1.3f;
+				break;
+			case 2: // 180%
+				mVUcycles /= 1.8f;
+				break;
+			case 3: // 300%
+				mVUcycles /= 3.0f;
+				break;
+			default:
+				break;
+		}
+	}
 	xMOV(eax, ptr32[&mVU.cycles]);
 	if (EmuConfig.Gamefixes.VUSyncHack)
 		xSUB(eax, mVUcycles); // Running behind, make sure we have time to run the block
diff --git a/pcsx2/x86/microVU_Execute.inl b/pcsx2/x86/microVU_Execute.inl
index 6484cb78a7..e43caa39d6 100644
--- a/pcsx2/x86/microVU_Execute.inl
+++ b/pcsx2/x86/microVU_Execute.inl
@@ -355,12 +355,12 @@ _mVUt void mVUcleanUp()
 		mVUreset(mVU, false);
 	}
 
-	mVU.cycles = mVU.totalCycles - mVU.cycles;
+	mVU.cycles = mVU.totalCycles - std::max(0, mVU.cycles);
 	mVU.regs().cycle += mVU.cycles;
 
 	if (!vuIndex || !THREAD_VU1)
 	{
-		u32 cycles_passed = std::min(mVU.cycles, 3000u) * EmuConfig.Speedhacks.EECycleSkip;
+		u32 cycles_passed = std::min(mVU.cycles, 3000) * EmuConfig.Speedhacks.EECycleSkip;
 		if (cycles_passed > 0)
 		{
 			s32 vu0_offset = VU0.cycle - cpuRegs.cycle;