diff --git a/External/FEXCore/Scripts/json_ir_doc_generator.py b/External/FEXCore/Scripts/json_ir_doc_generator.py
new file mode 100644
index 000000000..e4a721bd8
--- /dev/null
+++ b/External/FEXCore/Scripts/json_ir_doc_generator.py
@@ -0,0 +1,122 @@
+import collections
+import json
+import sys
+
+OpClasses = collections.OrderedDict()
+
+def get_ir_classes(ops, defines):
+    global OpClasses
+
+    for op_key, op_vals in ops.items():
+        if not ("Last" in op_vals):
+            OpClass = "#Unknown"
+
+            if ("OpClass" in op_vals):
+                OpClass = op_vals["OpClass"]
+
+            if not (OpClass in OpClasses):
+                OpClasses[OpClass] = []
+
+            OpClasses[OpClass].append([op_key, op_vals])
+
+    # Sort the dictionary after we are done parsing it
+    OpClasses = collections.OrderedDict(sorted(OpClasses.items()))
+
+def print_ir_op_index():
+    output_file.write("# Index\n")
+    output_file.write("## Op Classes\n")
+    for class_key, class_value in OpClasses.items():
+        output_file.write("- [%s](#%s)\n\n" % (class_key, class_key))
+
+    output_file.write("## Definitions\n")
+    output_file.write("- [Defines](#Defines)\n\n")
+
+def print_ir_ops():
+    for class_key, class_value in OpClasses.items():
+        output_file.write("# %s\n\n" % (class_key))
+        for op in class_value:
+            op_key = op[0]
+            op_vals = op[1]
+            output_file.write("## %s\n" % (op_key))
+            HasDest = ("HasDest" in op_vals and op_vals["HasDest"] == True)
+            HasSSAArgs = ("SSAArgs" in op_vals and len(op_vals["SSAArgs"]) > 0)
+            HasSSAArgNames = "SSANames" in op_vals
+            HasArgs = "Args" in op_vals
+            SSAArgsCount = 0
+            ArgCount = 0
+            if (HasSSAArgs):
+                SSAArgsCount = int(op_vals["SSAArgs"])
+            if (HasArgs):
+                ArgCount = len(op_vals["Args"])
+
+            TotalArgsCount = SSAArgsCount + (ArgCount / 2)
+
+            output_file.write(">")
+            if (HasDest):
+                output_file.write("%dest = ")
+
+            output_file.write("%s " % op_key)
+
+            ArgComma = (", ", "")
+            if (HasSSAArgs):
+                for i in range(0, SSAArgsCount):
+                    FinalArg = (i + 1) == TotalArgsCount
+                    if (HasSSAArgNames):
+                        output_file.write("%%%s%s" % (op_vals["SSANames"][i], ArgComma[FinalArg]))
+                    else:
+                        output_file.write("%%ssa%d%s" % (i, ArgComma[FinalArg]))
+
+            if (HasArgs):
+                Args = op_vals["Args"]
+                for i in range(0, ArgCount, 2):
+                    FinalArg = ((i / 2) + SSAArgsCount + 1) == TotalArgsCount
+                    data_type = Args[i]
+                    data_name = Args[i + 1]
+                    output_file.write("\<%s %s\>%s" % (data_type, data_name, ArgComma[FinalArg]))
+
+            output_file.write("\n\n")
+
+            if ("Desc" in op_vals):
+                desc = op_vals["Desc"]
+                if (isinstance(desc, list)):
+                    for line in desc:
+                        output_file.write("%s\n\n" % line)
+                else:
+                    output_file.write("%s\n" % op_vals["Desc"])
+            else:
+                output_file.write("XXX: Missing op desc!\n")
+
+def print_ir_defines(defines):
+    output_file.write("## Defines\n")
+    output_file.write("```cpp\n")
+    for define in defines:
+        output_file.write("%s\n" % (define))
+    output_file.write("```\n")
+
+if (len(sys.argv) < 3):
+    sys.exit()
+
+output_filename = sys.argv[2]
+json_file = open(sys.argv[1], "r")
+json_text = json_file.read()
+json_file.close()
+
+json_object = json.loads(json_text)
+json_object = {k.upper(): v for k, v in json_object.items()}
+
+ops = json_object["OPS"]
+defines = json_object["DEFINES"]
+
+get_ir_classes(ops, defines)
+
+output_file = open(output_filename, "w")
+
+print_ir_op_index()
+
+output_file.write("# IR documentation\n\n")
+
+print_ir_ops()
+
+print_ir_defines(defines)
+
+output_file.close()
diff --git a/External/FEXCore/Source/CMakeLists.txt b/External/FEXCore/Source/CMakeLists.txt
index e856ef6b8..b5056191f 100644
--- a/External/FEXCore/Source/CMakeLists.txt
+++ b/External/FEXCore/Source/CMakeLists.txt
@@ -145,8 +145,23 @@ add_custom_command(
 set_source_files_properties(${OUTPUT_NAME} PROPERTIES
   GENERATED TRUE)
 
+# Generate IR documentation
+set(OUTPUT_IR_DOC "${CMAKE_BINARY_DIR}/IR.md")
+
+add_custom_command(
+  OUTPUT "${OUTPUT_IR_DOC}"
+  DEPENDS "${INPUT_NAME}"
+  DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/../Scripts/json_ir_doc_generator.py"
+  COMMAND "python3" "${CMAKE_CURRENT_SOURCE_DIR}/../Scripts/json_ir_doc_generator.py" "${INPUT_NAME}" "${OUTPUT_IR_DOC}"
+  )
+
+set_source_files_properties(${OUTPUT_IR_NAME} PROPERTIES
+  GENERATED TRUE)
+
+# Create teh target
 add_custom_target(IR_INC
-  DEPENDS "${OUTPUT_NAME}")
+  DEPENDS "${OUTPUT_NAME}"
+  DEPENDS "${OUTPUT_IR_DOC}")
 
 # Add in diagnostic colours if the option is available.
 # Ninja code generator will kill colours if this isn't here