diff --git a/output.s b/output.s
new file mode 100644
index 0000000..e069b60
--- /dev/null
+++ b/output.s
@@ -0,0 +1,7 @@
+bb0:
+add sp,sp,-32
+sd ra,24(sp)
+sd s0,16(sp)
+sd s1,8(sp)
+sd s2,0(sp)
+bge a1,a2,LBB0_17
\ No newline at end of file
diff --git a/src/ch2/mod.rs b/src/ch2/mod.rs
index cef4fbf..12c030d 100644
--- a/src/ch2/mod.rs
+++ b/src/ch2/mod.rs
@@ -1,3 +1,3 @@
-mod size;
+mod sizeof;
 
-pub use size::*;
+pub use sizeof::*;
diff --git a/src/ch2/size.rs b/src/ch2/size.rs
deleted file mode 100644
index 77aa1b0..0000000
--- a/src/ch2/size.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-#[cfg(test)]
-pub mod tests {
-    use compiler::backend::*;
-
-    #[test]
-    pub fn sizeof() {
-        let addispsp_32 = AddInst::new(REG_SP.into(), REG_SP.into(), (-32).into());
-        let sdra24sp = SdInst::new(REG_RA.into(), (24).into(), REG_SP.into());
-        let sds016sp = SdInst::new(REG_S0.into(), (16).into(), REG_SP.into());
-        let addis0sp32 = AddInst::new(REG_S0.into(), REG_SP.into(), (32).into());
-
-        let lia55 = AddInst::new(REG_A5.into(), REG_ZERO.into(), (55).into());
-        let swa5_20s0 = SdInst::new(REG_A5.into(), (-20).into(), REG_S0.into());
-        let lia54 = AddInst::new(REG_A5.into(), REG_ZERO.into(), (4).into());
-        let swa5_24s0 = SdInst::new(REG_A5.into(), (-24).into(), REG_S0.into());
-        let lia50 = AddInst::new(REG_A5.into(), REG_ZERO.into(), (0).into());
-
-        let mva0a5 = MvInst::new(REG_A0.into(), REG_A5.into());
-        let ldra24sp = LdInst::new(REG_RA.into(), (24).into(), REG_SP.into());
-        let addispsp32 = AddInst::new(REG_SP.into(), REG_SP.into(), (32).into());
-        let addispsp32 = AddInst::new(REG_SP.into(), REG_SP.into(), (32).into());
-        let jrra = JmpInst::new(REG_RA.into());
-    }
-}
diff --git a/src/ch2/sizeof.rs b/src/ch2/sizeof.rs
new file mode 100644
index 0000000..a15c5ed
--- /dev/null
+++ b/src/ch2/sizeof.rs
@@ -0,0 +1,24 @@
+#[cfg(test)]
+pub mod tests {
+    use compiler::backend::*;
+
+    #[test]
+    pub fn quicksort() {
+        let mut bb0 = Block::new("bb0".into());
+        let addispsp_32 = Inst::Add(AddInst::new(REG_SP.into(), REG_SP.into(), (-32).into()));
+        let sdra24sp = Inst::Sd(SdInst::new(REG_RA.into(), (24).into(), REG_SP.into()));
+        let sds016sp = Inst::Sd(SdInst::new(REG_S0.into(), (16).into(), REG_SP.into()));
+        let sds18sp = Inst::Sd(SdInst::new(REG_S1.into(), (8).into(), REG_SP.into()));
+        let sds20sp = Inst::Sd(SdInst::new(REG_S2.into(), (0).into(), REG_SP.into()));
+        let bgea1a2lbb0_17 = Inst::Branch(
+            BranchInst::new(BranchOp::Bge, REG_A1.into(), REG_A2.into(), "LBB0_17".into())
+        );
+        bb0.push_inst(addispsp_32);
+        bb0.push_inst(sdra24sp);
+        bb0.push_inst(sds016sp);
+        bb0.push_inst(sds18sp);
+        bb0.push_inst(sds20sp);
+        bb0.push_inst(bgea1a2lbb0_17);
+        println!("{:?}", bb0.gen_asm());
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 19b1c36..f327c37 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,27 @@
 mod ch2;
 
+use std::{ fs::File, io::Write };
+
+use compiler::backend::*;
+
 fn main() {
-    println!("Hello, world!");
+    let mut bb0 = Block::new("bb0".into());
+    let addispsp_32 = Inst::Add(AddInst::new(REG_SP.into(), REG_SP.into(), (-32).into()));
+    let sdra24sp = Inst::Sd(SdInst::new(REG_RA.into(), (24).into(), REG_SP.into()));
+    let sds016sp = Inst::Sd(SdInst::new(REG_S0.into(), (16).into(), REG_SP.into()));
+    let sds18sp = Inst::Sd(SdInst::new(REG_S1.into(), (8).into(), REG_SP.into()));
+    let sds20sp = Inst::Sd(SdInst::new(REG_S2.into(), (0).into(), REG_SP.into()));
+    let bgea1a2lbb0_17 = Inst::Branch(
+        BranchInst::new(BranchOp::Bge, REG_A1.into(), REG_A2.into(), "LBB0_17".into())
+    );
+    bb0.push_inst(addispsp_32);
+    bb0.push_inst(sdra24sp);
+    bb0.push_inst(sds016sp);
+    bb0.push_inst(sds18sp);
+    bb0.push_inst(sds20sp);
+    bb0.push_inst(bgea1a2lbb0_17);
+    let asm = bb0.gen_asm();
+
+    let mut file = File::create("output.s").expect("Unable to create file");
+    let _ = file.write(asm.as_bytes()).expect("Unable to write data");
 }