diff --git a/Source/Core/Core/Src/GeckoCode.cpp b/Source/Core/Core/Src/GeckoCode.cpp
index 590f56980c..85d8c65a17 100644
--- a/Source/Core/Core/Src/GeckoCode.cpp
+++ b/Source/Core/Core/Src/GeckoCode.cpp
@@ -61,6 +61,9 @@ static Common::CriticalSection active_codes_lock;
 static GeckoCode::Code *codes_start = NULL, *current_code = NULL;
 static const GeckoCode::Code *codes_end = NULL;
 
+// asm codes used for CT6 CST1
+static std::map<u32, std::vector<u32> > inserted_asm_codes;
+
 // Functions for each code type
 bool RamWriteAndFill();
 bool RegularIf();
@@ -91,6 +94,8 @@ void SetActiveCodes(const std::vector<GeckoCode>& gcodes)
 		}
 
 	active_codes_lock.Leave();
+
+	inserted_asm_codes.clear();
 }
 
 bool RunGeckoCode(GeckoCode& gecko_code)
@@ -163,6 +168,10 @@ bool RunActiveCodes()
 	return true;
 }
 
+const std::map<u32, std::vector<u32> >& GetInsertedAsmCodes() {
+	return inserted_asm_codes;
+}
+
 // CT0: Direct ram write/fill
 // COMPLETE, maybe
 bool RamWriteAndFill()
@@ -817,9 +826,30 @@ bool AsmSwitchRange()
 
 		// CST1 : Insert ASM code in the game
 	case 0x1 :
-		// TODO:
-		return false;
-		break;
+		{
+			const int number_of_codes = code.data;
+			std::vector<u32>& asm_code = inserted_asm_codes[code.GetAddress()];
+			if (asm_code.empty()) {
+				for (int index = 0; index < number_of_codes; ++index) {
+					// Reserved for padding
+					if (current_code[index + 1].address != 0x60000000) {
+						asm_code.push_back(current_code[index + 1].address);
+					}
+
+					// Reserved for b instruction
+					if (current_code[index + 1].data != 0x00000000) {
+						asm_code.push_back(current_code[index + 1].data);
+					}
+				}
+			}
+
+			// Though the next code starts at current_code+number_of_codes+1,
+			// we add only number_of_codes. It is because the for statemet in
+			// RunGeckoCode() increments current_code.
+			current_code += number_of_codes;
+
+			break;
+		}
 
 		// CST3 : Create a branch
 	case 0x3 :
diff --git a/Source/Core/Core/Src/GeckoCode.h b/Source/Core/Core/Src/GeckoCode.h
index af8c17e6a2..f99cb45c38 100644
--- a/Source/Core/Core/Src/GeckoCode.h
+++ b/Source/Core/Core/Src/GeckoCode.h
@@ -66,6 +66,7 @@ namespace Gecko
 
 	void SetActiveCodes(const std::vector<GeckoCode>& gcodes);
 	bool RunActiveCodes();
+	const std::map<u32, std::vector<u32> >& GetInsertedAsmCodes();
 
 }	// namespace Gecko
 
diff --git a/Source/Core/Core/Src/PowerPC/PPCAnalyst.cpp b/Source/Core/Core/Src/PowerPC/PPCAnalyst.cpp
index bb94789588..a7374de23d 100644
--- a/Source/Core/Core/Src/PowerPC/PPCAnalyst.cpp
+++ b/Source/Core/Core/Src/PowerPC/PPCAnalyst.cpp
@@ -25,6 +25,7 @@
 #include "SignatureDB.h"
 #include "PPCAnalyst.h"
 #include "../ConfigManager.h"
+#include "../GeckoCode.h"
 
 // Analyzes PowerPC code in memory to find functions
 // After running, for each function we will know what functions it calls
@@ -327,17 +328,60 @@ u32 Flatten(u32 address, int *realsize, BlockStats *st, BlockRegStats *gpa,
 
 	u32 returnAddress = 0;
 
+	// Used for Gecko CST1 code. (See GeckoCode/GeckoCode.h)
+	// We use std::queue but it is not so slow
+	// because cst1_instructions does not allocate memory so many times.
+	std::queue<UGeckoInstruction> cst1_instructions;
+	const std::map<u32, std::vector<u32> >& inserted_asm_codes =
+		Gecko::GetInsertedAsmCodes();
+
 	// Do analysis of the code, look for dependencies etc
 	int numSystemInstructions = 0;
 	for (int i = 0; i < maxsize; i++)
-	{		
-		UGeckoInstruction inst = Memory::Read_Opcode_JIT(address);
+	{
+		UGeckoInstruction inst;
+
+		if (!cst1_instructions.empty())
+		{
+			// If the Gecko CST1 instruction queue is not empty,
+			// we comsume the first instruction.
+			inst = UGeckoInstruction(cst1_instructions.front());
+			cst1_instructions.pop();
+			address -= 4;
+
+		}
+		else
+		{
+			// If the address is the insertion point of Gecko CST1 code,
+			// we push the code into the instruction queue and
+			// consume the first instruction.
+			std::map<u32, std::vector<u32> >::const_iterator it =
+				inserted_asm_codes.find(address);
+			if (it != inserted_asm_codes.end())
+			{
+				const std::vector<u32>& codes = it->second;
+				for (std::vector<u32>::const_iterator it = codes.begin(),
+					itEnd = codes.end(); it != itEnd; ++it)
+				{
+					cst1_instructions.push(*it);
+				}
+				inst = UGeckoInstruction(cst1_instructions.front());
+				cst1_instructions.pop();
+
+			}
+			else
+			{
+				inst = Memory::Read_Opcode_JIT(address);
+			}
+		}
+		
 		if (inst.hex != 0)
 		{
 			num_inst++;
 			memset(&code[i], 0, sizeof(CodeOp));
 			GekkoOPInfo *opinfo = GetOpInfo(inst);
 			code[i].opinfo = opinfo;
+			// FIXME: code[i].address may not be correct due to CST1 code.
 			code[i].address = address;
 			code[i].inst = inst;
 			code[i].branchTo = -1;