Core/Jits: Adds an option to disable the register cache.

This will help to disable all inter-instruction dependencies.
So android users can check if only a single instruction is broken without compiling dolphin on their own.

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsFragmentPresenter.java

@@ -640,6 +640,8 @@ public final class SettingsFragmentPresenter
     Setting jitSystemRegistersOff =
             debugSection.getSetting(SettingsFile.KEY_DEBUG_JITSYSTEMREGISTEROFF);
     Setting jitBranchOff = debugSection.getSetting(SettingsFile.KEY_DEBUG_JITBRANCHOFF);
+    Setting jitRegisterCacheOff =
+            debugSection.getSetting(SettingsFile.KEY_DEBUG_JITREGISTERCACHEOFF);
 
     sl.add(new HeaderSetting(null, null, R.string.debug_warning, 0));
 
@@ -672,6 +674,9 @@ public final class SettingsFragmentPresenter
     sl.add(new CheckBoxSetting(SettingsFile.KEY_DEBUG_JITBRANCHOFF, Settings.SECTION_DEBUG,
             R.string.debug_jitbranchoff, 0, false,
             jitBranchOff));
+    sl.add(new CheckBoxSetting(SettingsFile.KEY_DEBUG_JITREGISTERCACHEOFF, Settings.SECTION_DEBUG,
+            R.string.debug_jitregistercacheoff, 0, false,
+            jitRegisterCacheOff));
   }
 
   private void addStereoSettings(ArrayList<SettingsItem> sl)

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/utils/SettingsFile.java

@@ -102,6 +102,7 @@ public final class SettingsFile
   public static final String KEY_DEBUG_JITPAIREDOFF = "JitPairedOff";
   public static final String KEY_DEBUG_JITSYSTEMREGISTEROFF = "JitSystemRegistersOff";
   public static final String KEY_DEBUG_JITBRANCHOFF = "JitBranchOff";
+  public static final String KEY_DEBUG_JITREGISTERCACHEOFF = "JitRegisterCacheOff";
 
   public static final String KEY_GCPAD_TYPE = "SIDevice";
   public static final String KEY_GCPAD_G_TYPE = "PadType";

Source/Android/app/src/main/res/values/strings.xml

@@ -254,6 +254,7 @@
     <string name="debug_jitpairedoff">Jit Paired Disabled</string>
     <string name="debug_jitsystemregistersoffr">Jit System Registers Disabled</string>
     <string name="debug_jitbranchoff">Jit Branch Disabled</string>
+    <string name="debug_jitregistercacheoff">Jit Register Cache Disabled</string>
 
     <!-- Miscellaneous -->
     <string name="yes">Yes</string>

Source/Core/Core/ConfigManager.cpp

@@ -352,6 +352,7 @@ void SConfig::SaveJitDebugSettings(IniFile& ini)
   section->Set("JitPairedOff", bJITPairedOff);
   section->Set("JitSystemRegistersOff", bJITSystemRegistersOff);
   section->Set("JitBranchOff", bJITBranchOff);
+  section->Set("JitRegisterCacheOff", bJITRegisterCacheOff);
 }
 
 void SConfig::LoadSettings()
@@ -644,6 +645,7 @@ void SConfig::LoadJitDebugSettings(IniFile& ini)
   section->Get("JitPairedOff", &bJITPairedOff, false);
   section->Get("JitSystemRegistersOff", &bJITSystemRegistersOff, false);
   section->Get("JitBranchOff", &bJITBranchOff, false);
+  section->Get("JitRegisterCacheOff", &bJITRegisterCacheOff, false);
 }
 
 void SConfig::ResetRunningGameMetadata()
@@ -800,6 +802,7 @@ void SConfig::LoadDefaults()
   bJITPairedOff = false;
   bJITSystemRegistersOff = false;
   bJITBranchOff = false;
+  bJITRegisterCacheOff = false;
 
   ResetRunningGameMetadata();
 }

Source/Core/Core/ConfigManager.h

@@ -105,6 +105,7 @@ struct SConfig
   bool bJITPairedOff = false;
   bool bJITSystemRegistersOff = false;
   bool bJITBranchOff = false;
+  bool bJITRegisterCacheOff = false;
 
   bool bFastmem;
   bool bFPRF = false;

Source/Core/Core/PowerPC/Jit64/Jit.cpp

@@ -997,15 +997,23 @@ u8* Jit64::DoJit(u32 em_address, JitBlock* b, u32 nextPC)
         SetJumpTarget(noBreakpoint);
       }
 
-      // If we have an input register that is going to be used again, load it pre-emptively,
+      if (SConfig::GetInstance().bJITRegisterCacheOff)
-      // even if the instruction doesn't strictly need it in a register, to avoid redundant
+      {
-      // loads later. Of course, don't do this if we're already out of registers.
+        gpr.Flush();
-      // As a bit of a heuristic, make sure we have at least one register left over for the
+        fpr.Flush();
-      // output, which needs to be bound in the actual instruction compilation.
+      }
-      // TODO: make this smarter in the case that we're actually register-starved, i.e.
+      else
-      // prioritize the more important registers.
+      {
-      gpr.PreloadRegisters(op.regsIn & op.gprInReg);
+        // If we have an input register that is going to be used again, load it pre-emptively,
-      fpr.PreloadRegisters(op.fregsIn & op.fprInXmm);
+        // even if the instruction doesn't strictly need it in a register, to avoid redundant
+        // loads later. Of course, don't do this if we're already out of registers.
+        // As a bit of a heuristic, make sure we have at least one register left over for the
+        // output, which needs to be bound in the actual instruction compilation.
+        // TODO: make this smarter in the case that we're actually register-starved, i.e.
+        // prioritize the more important registers.
+        gpr.PreloadRegisters(op.regsIn & op.gprInReg);
+        fpr.PreloadRegisters(op.fregsIn & op.fprInXmm);
+      }
 
       CompileInstruction(op);
 

Source/Core/Core/PowerPC/JitArm64/Jit.cpp

@@ -776,6 +776,13 @@ void JitArm64::DoJit(u32 em_address, JitBlock* b, u32 nextPC)
         js.firstFPInstructionFound = true;
       }
 
+      if (SConfig::GetInstance().bJITRegisterCacheOff)
+      {
+        gpr.Flush(FLUSH_ALL);
+        fpr.Flush(FLUSH_ALL);
+        FlushCarry();
+      }
+
       CompileInstruction(op);
       if (!CanMergeNextInstructions(1) || js.op[1].opinfo->type != ::OpType::Integer)
         FlushCarry();

Source/Core/DolphinQt/MenuBar.cpp

@@ -142,7 +142,7 @@ void MenuBar::OnEmulationStateChanged(Core::State state)
        {m_jit_off, m_jit_loadstore_off, m_jit_loadstore_lbzx_off, m_jit_loadstore_lxz_off,
         m_jit_loadstore_lwz_off, m_jit_loadstore_floating_off, m_jit_loadstore_paired_off,
         m_jit_floatingpoint_off, m_jit_integer_off, m_jit_paired_off, m_jit_systemregisters_off,
-        m_jit_branch_off})
+        m_jit_branch_off, m_jit_register_cache_off})
   {
     action->setEnabled(running && !playing);
   }
@@ -896,6 +896,14 @@ void MenuBar::AddJITMenu()
     SConfig::GetInstance().bJITBranchOff = enabled;
     ClearCache();
   });
+
+  m_jit_register_cache_off = m_jit->addAction(tr("JIT Register Cache Off"));
+  m_jit_register_cache_off->setCheckable(true);
+  m_jit_register_cache_off->setChecked(SConfig::GetInstance().bJITRegisterCacheOff);
+  connect(m_jit_register_cache_off, &QAction::toggled, [this](bool enabled) {
+    SConfig::GetInstance().bJITRegisterCacheOff = enabled;
+    ClearCache();
+  });
 }
 
 void MenuBar::AddSymbolsMenu()

Source/Core/DolphinQt/MenuBar.h

@@ -261,6 +261,7 @@ private:
   QAction* m_jit_paired_off;
   QAction* m_jit_systemregisters_off;
   QAction* m_jit_branch_off;
+  QAction* m_jit_register_cache_off;
 
   bool m_game_selected = false;
 };