diff --git a/FEXCore/Source/Interface/Core/X86Tables/X87Tables.cpp b/FEXCore/Source/Interface/Core/X86Tables/X87Tables.cpp
index 239c85fea..371ab33c9 100644
--- a/FEXCore/Source/Interface/Core/X86Tables/X87Tables.cpp
+++ b/FEXCore/Source/Interface/Core/X86Tables/X87Tables.cpp
@@ -17,7 +17,7 @@ using namespace IR;
 // All OPDReg versions need it
 #define OPDReg(op, reg) ((1 << 15) | ((op - 0xD8) << 8) | (reg << 3))
 #define OPD(op, modrmop) (((op - 0xD8) << 8) | modrmop)
-constexpr std::array<DispatchTableEntry, 135> X87F64OpTable = {{
+constexpr std::array<DispatchTableEntry, 136> X87F64OpTable = {{
   {OPDReg(0xD8, 0) | 0x00, 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FADDF64, OpSize::i32Bit, false, OpDispatchBuilder::OpResult::RES_ST0>},
 
   {OPDReg(0xD8, 1) | 0x00, 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FMULF64, OpSize::i32Bit, false, OpDispatchBuilder::OpResult::RES_ST0>},
@@ -251,6 +251,8 @@ constexpr std::array<DispatchTableEntry, 135> X87F64OpTable = {{
 
   {OPD(0xDE, 0xC0), 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FADDF64, OpSize::f80Bit, false, OpDispatchBuilder::OpResult::RES_STI>},
   {OPD(0xDE, 0xC8), 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FMULF64, OpSize::f80Bit, false, OpDispatchBuilder::OpResult::RES_STI>},
+  {OPD(0xDE, 0xD0), 8,
+   &OpDispatchBuilder::Bind<&OpDispatchBuilder::FCOMIF64, OpSize::f80Bit, false, OpDispatchBuilder::FCOMIFlags::FLAGS_X87, false>},
   {OPD(0xDE, 0xD9), 1,
    &OpDispatchBuilder::Bind<&OpDispatchBuilder::FCOMIF64, OpSize::f80Bit, false, OpDispatchBuilder::FCOMIFlags::FLAGS_X87, true>},
   {OPD(0xDE, 0xE0), 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FSUBF64, OpSize::f80Bit, false, true, OpDispatchBuilder::OpResult::RES_STI>},
@@ -285,7 +287,7 @@ constexpr std::array<DispatchTableEntry, 135> X87F64OpTable = {{
    &OpDispatchBuilder::Bind<&OpDispatchBuilder::FCOMIF64, OpSize::f80Bit, false, OpDispatchBuilder::FCOMIFlags::FLAGS_RFLAGS, false>},
 }};
 
-constexpr std::array<DispatchTableEntry, 135> X87F80OpTable = {{
+constexpr std::array<DispatchTableEntry, 136> X87F80OpTable = {{
   {OPDReg(0xD8, 0) | 0x00, 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FADD, OpSize::i32Bit, false, OpDispatchBuilder::OpResult::RES_ST0>},
 
   {OPDReg(0xD8, 1) | 0x00, 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FMUL, OpSize::i32Bit, false, OpDispatchBuilder::OpResult::RES_ST0>},
@@ -508,6 +510,7 @@ constexpr std::array<DispatchTableEntry, 135> X87F80OpTable = {{
 
   {OPD(0xDE, 0xC0), 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FADD, OpSize::f80Bit, false, OpDispatchBuilder::OpResult::RES_STI>},
   {OPD(0xDE, 0xC8), 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FMUL, OpSize::f80Bit, false, OpDispatchBuilder::OpResult::RES_STI>},
+  {OPD(0xDE, 0xD0), 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FCOMI, OpSize::f80Bit, false, OpDispatchBuilder::FCOMIFlags::FLAGS_X87, false>},
   {OPD(0xDE, 0xD9), 1, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FCOMI, OpSize::f80Bit, false, OpDispatchBuilder::FCOMIFlags::FLAGS_X87, true>},
   {OPD(0xDE, 0xE0), 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FSUB, OpSize::f80Bit, false, true, OpDispatchBuilder::OpResult::RES_STI>},
   {OPD(0xDE, 0xE8), 8, &OpDispatchBuilder::Bind<&OpDispatchBuilder::FSUB, OpSize::f80Bit, false, false, OpDispatchBuilder::OpResult::RES_STI>},
@@ -744,7 +747,7 @@ auto GenerateX87TableLambda = [](const auto DispatchTable) consteval {
       //  / 1
       {OPD(0xDE, 0xC8), 8, X86InstInfo{"FMULP", TYPE_X87, FLAGS_POP, 0}},
       //  / 2
-      {OPD(0xDE, 0xD0), 8, X86InstInfo{"", TYPE_INVALID, FLAGS_NONE, 0}},
+      {OPD(0xDE, 0xD0), 8, X86InstInfo{"FCOMP", TYPE_X87, FLAGS_X87_FLAGS | FLAGS_POP, 0}},
       //  / 3
       {OPD(0xDE, 0xD8), 1, X86InstInfo{"", TYPE_INVALID, FLAGS_NONE, 0}},
       {OPD(0xDE, 0xD9), 1, X86InstInfo{"FCOMPP", TYPE_X87, FLAGS_POP, 0}},
diff --git a/unittests/ASM/X87/DE_D0.asm b/unittests/ASM/X87/DE_D0.asm
new file mode 100644
index 000000000..7ea2f5cad
--- /dev/null
+++ b/unittests/ASM/X87/DE_D0.asm
@@ -0,0 +1,19 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "MM6":  ["0x8000000000000000", "0x3FFF"],
+    "MM7":  ["0x8000000000000000", "0x3FFF"]
+  }
+}
+%endif
+
+; Only tests pop behaviour
+; Tests undocumented fcomp implementation at 0xde, 0xd0+i
+finit
+fld1
+fldz
+; fcomp
+db 0xde, 0xd1
+fld1
+
+hlt