diff --git a/Source/Project64-core/N64System/Interpreter/InterpreterOps.cpp b/Source/Project64-core/N64System/Interpreter/InterpreterOps.cpp
index 5759e0f65..af100bf17 100644
--- a/Source/Project64-core/N64System/Interpreter/InterpreterOps.cpp
+++ b/Source/Project64-core/N64System/Interpreter/InterpreterOps.cpp
@@ -481,7 +481,7 @@ R4300iOp::Func * R4300iOp::BuildInterpreter()
     Jump_CoP1_S[5] = COP1_S_ABS;
     Jump_CoP1_S[6] = COP1_S_MOV;
     Jump_CoP1_S[7] = COP1_S_NEG;
-    Jump_CoP1_S[8] = UnknownOpcode;
+    Jump_CoP1_S[8] = COP1_S_ROUND_L;
     Jump_CoP1_S[9] = COP1_S_TRUNC_L;
     Jump_CoP1_S[10] = COP1_S_CEIL_L;		//added by Witten
     Jump_CoP1_S[11] = COP1_S_FLOOR_L;		//added by Witten
@@ -546,7 +546,7 @@ R4300iOp::Func * R4300iOp::BuildInterpreter()
     Jump_CoP1_D[5] = COP1_D_ABS;
     Jump_CoP1_D[6] = COP1_D_MOV;
     Jump_CoP1_D[7] = COP1_D_NEG;
-    Jump_CoP1_D[8] = UnknownOpcode;
+    Jump_CoP1_D[8] = COP1_D_ROUND_L;
     Jump_CoP1_D[9] = COP1_D_TRUNC_L;		//added by Witten
     Jump_CoP1_D[10] = COP1_D_CEIL_L;		//added by Witten
     Jump_CoP1_D[11] = COP1_D_FLOOR_L;		//added by Witten
@@ -2461,6 +2461,12 @@ void R4300iOp::COP1_S_NEG()
     *(float *)_FPR_S[m_Opcode.fd] = (*(float *)_FPR_S[m_Opcode.fs] * -1.0f);
 }
 
+void R4300iOp::COP1_S_ROUND_L()
+{
+    TEST_COP1_USABLE_EXCEPTION();
+    Float_RoundToInteger64(&*(int64_t *)_FPR_D[m_Opcode.fd], &*(float *)_FPR_S[m_Opcode.fs], FE_TONEAREST);
+}
+
 void R4300iOp::COP1_S_TRUNC_L()
 {
     TEST_COP1_USABLE_EXCEPTION();
@@ -2652,6 +2658,12 @@ void R4300iOp::COP1_D_NEG()
     *(double *)_FPR_D[m_Opcode.fd] = (*(double *)_FPR_D[m_Opcode.fs] * -1.0);
 }
 
+void R4300iOp::COP1_D_ROUND_L()
+{
+    TEST_COP1_USABLE_EXCEPTION();
+    Double_RoundToInteger64(&*(uint64_t *)_FPR_S[m_Opcode.fd], &*(double *)_FPR_D[m_Opcode.fs], FE_TONEAREST);
+}
+
 void R4300iOp::COP1_D_TRUNC_L()
 {	//added by Witten
     TEST_COP1_USABLE_EXCEPTION();
diff --git a/Source/Project64-core/N64System/Interpreter/InterpreterOps.h b/Source/Project64-core/N64System/Interpreter/InterpreterOps.h
index 6aeb7000d..cf370db61 100644
--- a/Source/Project64-core/N64System/Interpreter/InterpreterOps.h
+++ b/Source/Project64-core/N64System/Interpreter/InterpreterOps.h
@@ -160,6 +160,7 @@ public:
     static void  COP1_S_ABS();
     static void  COP1_S_MOV();
     static void  COP1_S_NEG();
+    static void  COP1_S_ROUND_L();
     static void  COP1_S_TRUNC_L();
     static void  COP1_S_CEIL_L();  //added by Witten
     static void  COP1_S_FLOOR_L(); //added by Witten
@@ -181,6 +182,7 @@ public:
     static void  COP1_D_ABS();
     static void  COP1_D_MOV();
     static void  COP1_D_NEG();
+    static void  COP1_D_ROUND_L();
     static void  COP1_D_TRUNC_L(); //added by Witten
     static void  COP1_D_CEIL_L();  //added by Witten
     static void  COP1_D_FLOOR_L(); //added by Witten
diff --git a/Source/Project64-core/N64System/Interpreter/InterpreterOps32.cpp b/Source/Project64-core/N64System/Interpreter/InterpreterOps32.cpp
index 09447ae6d..6d8324b36 100644
--- a/Source/Project64-core/N64System/Interpreter/InterpreterOps32.cpp
+++ b/Source/Project64-core/N64System/Interpreter/InterpreterOps32.cpp
@@ -376,7 +376,7 @@ R4300iOp32::Func * R4300iOp32::BuildInterpreter()
     Jump_CoP1_S[5] = R4300iOp::COP1_S_ABS;
     Jump_CoP1_S[6] = R4300iOp::COP1_S_MOV;
     Jump_CoP1_S[7] = R4300iOp::COP1_S_NEG;
-    Jump_CoP1_S[8] = R4300iOp::UnknownOpcode;
+	Jump_CoP1_S[8] = R4300iOp::COP1_S_ROUND_L;
     Jump_CoP1_S[9] = R4300iOp::COP1_S_TRUNC_L;
     Jump_CoP1_S[10] = R4300iOp::COP1_S_CEIL_L;		//added by Witten
     Jump_CoP1_S[11] = R4300iOp::COP1_S_FLOOR_L;		//added by Witten
@@ -441,7 +441,7 @@ R4300iOp32::Func * R4300iOp32::BuildInterpreter()
     Jump_CoP1_D[5] = R4300iOp::COP1_D_ABS;
     Jump_CoP1_D[6] = R4300iOp::COP1_D_MOV;
     Jump_CoP1_D[7] = R4300iOp::COP1_D_NEG;
-    Jump_CoP1_D[8] = R4300iOp::UnknownOpcode;
+    Jump_CoP1_D[8] = R4300iOp::COP1_D_ROUND_L;
     Jump_CoP1_D[9] = R4300iOp::COP1_D_TRUNC_L;		//added by Witten
     Jump_CoP1_D[10] = R4300iOp::COP1_D_CEIL_L;		//added by Witten
     Jump_CoP1_D[11] = R4300iOp::COP1_D_FLOOR_L;		//added by Witten
diff --git a/Source/Project64-core/N64System/Recompiler/CodeSection.cpp b/Source/Project64-core/N64System/Recompiler/CodeSection.cpp
index 9cfc153db..f98aef1c2 100644
--- a/Source/Project64-core/N64System/Recompiler/CodeSection.cpp
+++ b/Source/Project64-core/N64System/Recompiler/CodeSection.cpp
@@ -1292,6 +1292,7 @@ bool CCodeSection::GenerateX86Code(uint32_t Test)
                 case R4300i_COP1_FUNCT_NEG: COP1_S_NEG(); break;
                 case R4300i_COP1_FUNCT_SQRT: COP1_S_SQRT(); break;
                 case R4300i_COP1_FUNCT_MOV: COP1_S_MOV(); break;
+                case R4300i_COP1_FUNCT_ROUND_L: COP1_S_ROUND_L(); break;
                 case R4300i_COP1_FUNCT_TRUNC_L: COP1_S_TRUNC_L(); break;
                 case R4300i_COP1_FUNCT_CEIL_L: COP1_S_CEIL_L(); break;	//added by Witten
                 case R4300i_COP1_FUNCT_FLOOR_L: COP1_S_FLOOR_L(); break;	//added by Witten
@@ -1326,6 +1327,7 @@ bool CCodeSection::GenerateX86Code(uint32_t Test)
                 case R4300i_COP1_FUNCT_NEG: COP1_D_NEG(); break;
                 case R4300i_COP1_FUNCT_SQRT: COP1_D_SQRT(); break;
                 case R4300i_COP1_FUNCT_MOV: COP1_D_MOV(); break;
+                case R4300i_COP1_FUNCT_ROUND_L: COP1_D_ROUND_L(); break;
                 case R4300i_COP1_FUNCT_TRUNC_L: COP1_D_TRUNC_L(); break;	//added by Witten
                 case R4300i_COP1_FUNCT_CEIL_L: COP1_D_CEIL_L(); break;	//added by Witten
                 case R4300i_COP1_FUNCT_FLOOR_L: COP1_D_FLOOR_L(); break;	//added by Witten
diff --git a/Source/Project64-core/N64System/Recompiler/RecompilerOps.cpp b/Source/Project64-core/N64System/Recompiler/RecompilerOps.cpp
index c7dd1f425..d697e157d 100644
--- a/Source/Project64-core/N64System/Recompiler/RecompilerOps.cpp
+++ b/Source/Project64-core/N64System/Recompiler/RecompilerOps.cpp
@@ -5946,6 +5946,18 @@ void CRecompilerOps::COP1_S_MOV()
     Load_FPR_ToTop(m_Opcode.fd, m_Opcode.fs, CRegInfo::FPU_Float);
 }
 
+void CRecompilerOps::COP1_S_ROUND_L()
+{
+    CPU_Message("  %X %s", m_CompilePC, R4300iOpcodeName(m_Opcode.Hex, m_CompilePC));
+
+    m_Section->CompileCop1Test();
+    if (m_Opcode.fd != m_Opcode.fs || !RegInStack(m_Opcode.fd, CRegInfo::FPU_Float))
+    {
+        Load_FPR_ToTop(m_Opcode.fd, m_Opcode.fs, CRegInfo::FPU_Float);
+    }
+    ChangeFPURegFormat(m_Opcode.fd, CRegInfo::FPU_Float, CRegInfo::FPU_Qword, CRegInfo::RoundNearest);
+}
+
 void CRecompilerOps::COP1_S_TRUNC_L()
 {
     CPU_Message("  %X %s", m_CompilePC, R4300iOpcodeName(m_Opcode.Hex, m_CompilePC));
@@ -6296,6 +6308,22 @@ void CRecompilerOps::COP1_D_MOV()
     Load_FPR_ToTop(m_Opcode.fd, m_Opcode.fs, CRegInfo::FPU_Double);
 }
 
+void CRecompilerOps::COP1_D_ROUND_L()
+{
+    CPU_Message("  %X %s", m_CompilePC, R4300iOpcodeName(m_Opcode.Hex, m_CompilePC));
+
+    m_Section->CompileCop1Test();
+    if (RegInStack(m_Opcode.fs, CRegInfo::FPU_Double) || RegInStack(m_Opcode.fs, CRegInfo::FPU_Qword))
+    {
+        UnMap_FPR(m_Opcode.fs, true);
+    }
+    if (m_Opcode.fd != m_Opcode.fs || !RegInStack(m_Opcode.fd, CRegInfo::FPU_Double))
+    {
+        Load_FPR_ToTop(m_Opcode.fd, m_Opcode.fs, CRegInfo::FPU_Double);
+    }
+    ChangeFPURegFormat(m_Opcode.fd, CRegInfo::FPU_Double, CRegInfo::FPU_Qword, CRegInfo::RoundNearest);
+}
+
 void CRecompilerOps::COP1_D_TRUNC_L() //added by Witten
 {
     CPU_Message("  %X %s", m_CompilePC, R4300iOpcodeName(m_Opcode.Hex, m_CompilePC));
diff --git a/Source/Project64-core/N64System/Recompiler/RecompilerOps.h b/Source/Project64-core/N64System/Recompiler/RecompilerOps.h
index 0bcc46866..281829bba 100644
--- a/Source/Project64-core/N64System/Recompiler/RecompilerOps.h
+++ b/Source/Project64-core/N64System/Recompiler/RecompilerOps.h
@@ -160,6 +160,7 @@ protected:
     static void COP1_S_NEG     ();
     static void COP1_S_SQRT    ();
     static void COP1_S_MOV     ();
+    static void COP1_S_ROUND_L ();
     static void COP1_S_TRUNC_L ();
     static void COP1_S_CEIL_L  (); //added by Witten
     static void COP1_S_FLOOR_L (); //added by Witten
@@ -181,6 +182,7 @@ protected:
     static void COP1_D_NEG     ();
     static void COP1_D_SQRT    ();
     static void COP1_D_MOV     ();
+    static void COP1_D_ROUND_L ();
     static void COP1_D_TRUNC_L (); //added by Witten
     static void COP1_D_CEIL_L  (); //added by Witten
     static void COP1_D_FLOOR_L (); //added by Witten