diff --git a/evmcc/Compiler.cpp b/evmcc/Compiler.cpp
index 0b1793244..3cd12833f 100644
--- a/evmcc/Compiler.cpp
+++ b/evmcc/Compiler.cpp
@@ -19,6 +19,7 @@ struct
 	llvm::Type* word256arr;
 	llvm::Type* size;
 	llvm::Type* Void;
+	llvm::Type* WordLowPrecision;
 } Types;
 
 Compiler::Compiler()
@@ -31,6 +32,9 @@ Compiler::Compiler()
 	Types.word256arr = llvm::ArrayType::get(Types.word256, 100);
 	Types.size = llvm::Type::getInt64Ty(context);
 	Types.Void = llvm::Type::getVoidTy(context);
+
+	// TODO: Use 64-bit for now. In 128-bit compiler-rt library functions are required
+	Types.WordLowPrecision = llvm::Type::getIntNTy(context, 64);
 }
 
 
@@ -59,6 +63,85 @@ std::unique_ptr<llvm::Module> Compiler::compile(const dev::bytes& bytecode)
 		auto inst = static_cast<Instruction>(*pc);
 		switch (inst)
 		{
+
+		case Instruction::ADD:
+		{
+			auto lhs = stack.pop();
+			auto rhs = stack.pop();
+			auto result = builder.CreateAdd(lhs, rhs);
+			stack.push(result);
+			break;
+		}
+
+		case Instruction::SUB:
+		{
+			auto lhs = stack.pop();
+			auto rhs = stack.pop();
+			auto result = builder.CreateSub(lhs, rhs);
+			stack.push(result);
+			break;
+		}
+
+		case Instruction::MUL:
+		{
+			auto lhs256 = stack.pop();
+			auto rhs256 = stack.pop();
+			auto lhs128 = builder.CreateTrunc(lhs256, Types.WordLowPrecision);
+			auto rhs128 = builder.CreateTrunc(rhs256, Types.WordLowPrecision);
+			auto res128 = builder.CreateMul(lhs128, rhs128);
+			auto res256 = builder.CreateZExt(res128, Types.word256);
+			stack.push(res256);
+			break;
+		}
+
+		case Instruction::DIV:
+		{
+			auto lhs256 = stack.pop();
+			auto rhs256 = stack.pop();
+			auto lhs128 = builder.CreateTrunc(lhs256, Types.WordLowPrecision);
+			auto rhs128 = builder.CreateTrunc(rhs256, Types.WordLowPrecision);
+			auto res128 = builder.CreateUDiv(lhs128, rhs128);
+			auto res256 = builder.CreateZExt(res128, Types.word256);
+			stack.push(res256);
+			break;
+		}
+
+		case Instruction::SDIV:
+		{
+			auto lhs256 = stack.pop();
+			auto rhs256 = stack.pop();
+			auto lhs128 = builder.CreateTrunc(lhs256, Types.WordLowPrecision);
+			auto rhs128 = builder.CreateTrunc(rhs256, Types.WordLowPrecision);
+			auto res128 = builder.CreateSDiv(lhs128, rhs128);
+			auto res256 = builder.CreateSExt(res128, Types.word256);
+			stack.push(res256);
+			break;
+		}
+
+		case Instruction::MOD:
+		{
+			auto lhs256 = stack.pop();
+			auto rhs256 = stack.pop();
+			auto lhs128 = builder.CreateTrunc(lhs256, Types.WordLowPrecision);
+			auto rhs128 = builder.CreateTrunc(rhs256, Types.WordLowPrecision);
+			auto res128 = builder.CreateURem(lhs128, rhs128);
+			auto res256 = builder.CreateZExt(res128, Types.word256);
+			stack.push(res256);
+			break;
+		}
+
+		case Instruction::SMOD:
+		{
+			auto lhs256 = stack.pop();
+			auto rhs256 = stack.pop();
+			auto lhs128 = builder.CreateTrunc(lhs256, Types.WordLowPrecision);
+			auto rhs128 = builder.CreateTrunc(rhs256, Types.WordLowPrecision);
+			auto res128 = builder.CreateSRem(lhs128, rhs128);
+			auto res256 = builder.CreateSExt(res128, Types.word256);
+			stack.push(res256);
+			break;
+		}
+
 		case Instruction::POP:
 		{
 			stack.pop();
diff --git a/evmcc/bytecode/arithmetic_test.evm b/evmcc/bytecode/arithmetic_test.evm
new file mode 100644
index 000000000..67e86b310
--- /dev/null
+++ b/evmcc/bytecode/arithmetic_test.evm
@@ -0,0 +1 @@
+60016001900160070260050160029004600490066021900560150160030260059007600303
diff --git a/evmcc/bytecode/fib1.evm b/evmcc/bytecode/fib1.evm
new file mode 100644
index 000000000..4c141314e
--- /dev/null
+++ b/evmcc/bytecode/fib1.evm
@@ -0,0 +1 @@
+60016001818101818101818101818101818101818101818101818101818101818101818101818101818101818101818101818101818101
diff --git a/evmcc/lll/arithmetic_test.lll b/evmcc/lll/arithmetic_test.lll
new file mode 100644
index 000000000..e2c14d4c7
--- /dev/null
+++ b/evmcc/lll/arithmetic_test.lll
@@ -0,0 +1,29 @@
+
+(asm 
+1
+1
+SWAP1
+ADD	;; 2
+7
+MUL	;; 14
+5
+ADD	;; 19
+2
+SWAP1
+DIV	;; 9
+4
+SWAP1
+MOD ;; 1
+33
+SWAP1
+SDIV;; 0
+21
+ADD	;; 21
+3
+MUL	;; 63
+5
+SWAP1
+SMOD;; 3
+3
+SUB ;; 0
+)
\ No newline at end of file
diff --git a/evmcc/lll/fib1.lll b/evmcc/lll/fib1.lll
new file mode 100644
index 000000000..286bed275
--- /dev/null
+++ b/evmcc/lll/fib1.lll
@@ -0,0 +1,57 @@
+;; Fibbonacci unrolled
+
+(asm 
+1
+1
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+DUP2
+DUP2
+ADD
+)
\ No newline at end of file