register constant check optimization + disable branch likely's for now

src/backend/core/registers/Registers.hpp

@@ -14,17 +14,41 @@ struct Registers {
   [[nodiscard]] bool IsRegConstant(const u32 index) const {
     if (index == 0)
       return true;
-    return gprIsConstant[index];
+    return regIsConstant & (1 << index);
   }
 
   [[nodiscard]] bool IsRegConstant(const u32 first, const u32 second) const {
     return IsRegConstant(first) && IsRegConstant(second);
   }
 
+  bool GetLOConstant() {
+    return regIsConstant & (1ull << 32);
+  }
+
+  bool GetHIConstant() {
+    return regIsConstant & (1ull << 33);
+  }
+
+  void SetLOConstant() {
+    regIsConstant |= (1ull << 32);
+  }
+
+  void SetHIConstant() {
+    regIsConstant |= (1ull << 33);
+  }
+
+  void UnsetLOConstant() {
+    regIsConstant &= ~(1ull << 32);
+  }
+
+  void UnsetHIConstant() {
+    regIsConstant &= ~(1ull << 33);
+  }
+
   JIT *jit = nullptr;
 
-  std::array<bool, 32> gprIsConstant{};
-  bool loIsConstant = false, hiIsConstant = false;
+  uint64_t regIsConstant = 0;
+
   Cop0 cop0;
   Cop1 cop1;
   s64 oldPC{}, pc{}, nextPC{};