Disable MMUL as a compat hack to fix Tekken games leg shaking.

Core/Compatibility.cpp

@@ -76,6 +76,7 @@ void Compatibility::CheckSettings(IniFile &iniFile, const std::string &gameID) {
 	CheckSetting(iniFile, gameID, "ForceUMDDelay", &flags_.ForceUMDDelay);
 	CheckSetting(iniFile, gameID, "ForceMax60FPS", &flags_.ForceMax60FPS);
 	CheckSetting(iniFile, gameID, "JitInvalidationHack", &flags_.JitInvalidationHack);
+	CheckSetting(iniFile, gameID, "MMULDisableHack", &flags_.MMULDisableHack);
 }
 
 void Compatibility::CheckSetting(IniFile &iniFile, const std::string &gameID, const char *option, bool *flag) {

Core/Compatibility.h

@@ -76,6 +76,7 @@ struct CompatFlags {
 	bool ForceUMDDelay;
 	bool ForceMax60FPS;
 	bool JitInvalidationHack;
+	bool MMULDisableHack;
 };
 
 class IniFile;

Core/MIPS/ARM/ArmCompVFPU.cpp

@@ -29,6 +29,7 @@
 #include "Common/CPUDetect.h"
 #include "Core/Config.h"
 #include "Core/Reporting.h"
+#include "Core/System.h"
 
 #include "Core/MIPS/ARM/ArmJit.h"
 #include "Core/MIPS/ARM/ArmRegCache.h"
@@ -1467,6 +1468,8 @@ namespace MIPSComp
 	}
 
 	void ArmJit::Comp_Vmmul(MIPSOpcode op) {
+		if (PSP_CoreParameter().compat.flags().MMULDisableHack)
+			DISABLE;
 		CONDITIONAL_DISABLE(VFPU_MTX_VMMUL);
 		if (js.HasUnknownPrefix()) {
 			DISABLE;

Core/MIPS/ARM/ArmCompVFPUNEON.cpp

@@ -41,6 +41,7 @@
 #include "Core/MIPS/MIPSVFPUUtils.h"
 #include "Core/Config.h"
 #include "Core/Reporting.h"
+#include "Core/System.h"
 
 #include "Core/MIPS/ARM/ArmJit.h"
 #include "Core/MIPS/ARM/ArmRegCache.h"
@@ -856,6 +857,8 @@ void ArmJit::CompNEON_Vmmov(MIPSOpcode op) {
 }
 
 void ArmJit::CompNEON_Vmmul(MIPSOpcode op) {
+	if (PSP_CoreParameter().compat.flags().MMULDisableHack)
+		DISABLE;
 	CONDITIONAL_DISABLE(VFPU_MTX_VMMUL);
 
 	MatrixSize msz = GetMtxSize(op);

Core/MIPS/ARM64/Arm64CompVFPU.cpp

@@ -29,6 +29,7 @@
 #include "Common/CPUDetect.h"
 #include "Core/Config.h"
 #include "Core/Reporting.h"
+#include "Core/System.h"
 
 #include "Common/Arm64Emitter.h"
 #include "Core/MIPS/ARM64/Arm64Jit.h"
@@ -1214,6 +1215,8 @@ namespace MIPSComp {
 	}
 
 	void Arm64Jit::Comp_Vmmul(MIPSOpcode op) {
+		if (PSP_CoreParameter().compat.flags().MMULDisableHack)
+			DISABLE;
 		CONDITIONAL_DISABLE(VFPU_MTX_VMMUL);
 		if (!js.HasNoPrefix()) {
 			DISABLE;

Core/MIPS/IR/IRCompVFPU.cpp

@@ -29,6 +29,7 @@
 #include "Core/MIPS/IR/IRFrontend.h"
 #include "Core/MIPS/IR/IRRegCache.h"
 #include "Core/Reporting.h"
+#include "Core/System.h"
 
 
 // All functions should have CONDITIONAL_DISABLE, so we can narrow things down to a file quickly.
@@ -1237,6 +1238,8 @@ namespace MIPSComp {
 	// This may or may not be a win when using the IR interpreter...
 	// Many more instructions to interpret.
 	void IRFrontend::Comp_Vmmul(MIPSOpcode op) {
+		if (PSP_CoreParameter().compat.flags().MMULDisableHack)
+			DISABLE;
 		CONDITIONAL_DISABLE(VFPU_MTX_VMMUL);
 		if (!js.HasNoPrefix()) {
 			DISABLE;

Core/MIPS/x86/CompVFPU.cpp

@@ -37,6 +37,7 @@
 #include "Core/MIPS/MIPSVFPUUtils.h"
 #include "Core/MIPS/x86/Jit.h"
 #include "Core/MIPS/x86/RegCache.h"
+#include "Core/System.h"
 
 // All functions should have CONDITIONAL_DISABLE, so we can narrow things down to a file quickly.
 // Currently known non working ones should have DISABLE.
@@ -2802,6 +2803,8 @@ void Jit::Comp_VScl(MIPSOpcode op) {
 }
 
 void Jit::Comp_Vmmul(MIPSOpcode op) {
+	if (PSP_CoreParameter().compat.flags().MMULDisableHack)
+		DISABLE;
 	CONDITIONAL_DISABLE(VFPU_MTX_VMMUL);
 
 	// TODO: This probably ignores prefixes?

assets/compat.ini

@@ -332,6 +332,24 @@ ULJS00201 = true
 # Bijin Tokei Portable not even a game, but needs it to load 2 miniatures, they will be low res, but better than black
 NPJH00055 = true
 
+[MMULDisableHack]
+# Force software MMUL to fix Tekken leg shaking
+# Tekken 5 DR
+ULJS00048 = true
+ULUS10139 = true
+UCES00356 = true
+ULJS19013 = true
+NPJH50137 = true
+
+# Tekken 6
+ULUS10466 = true
+ULES01376 = true
+ULJS00224 = true
+NPUH10047 = true
+ULAS42214 = true
+ULJS19054 = true
+NPJH50184 = true
+
 [RequireBufferedRendering]
 # Warn the user that the game will not work and have issue, if buffered rendering is not enabled.
 # Midnight Club: LA Remix