diff --git a/src/CodeGen/calling_convention.rs b/src/CodeGen/calling_convention.rs
index 66b5681b..00027b3c 100644
--- a/src/CodeGen/calling_convention.rs
+++ b/src/CodeGen/calling_convention.rs
@@ -45,7 +45,7 @@ impl MachineCallingConvention {
             CallConv::SystemV => {
                 match arch {
                     Arch::X86_64 => vec![
-                        Reg::x64(x64Reg::Rsi), Reg::x64(x64Reg::Rdi), 
+                        Reg::x64(x64Reg::Rdi), Reg::x64(x64Reg::Rsi), 
                         Reg::x64(x64Reg::Rcx), Reg::x64(x64Reg::Rdx), 
                         Reg::x64(x64Reg::R8), Reg::x64(x64Reg::R9)
                     ],
diff --git a/src/CodeGen/compilation/call.rs b/src/CodeGen/compilation/call.rs
index 9debc112..6e72cfa4 100644
--- a/src/CodeGen/compilation/call.rs
+++ b/src/CodeGen/compilation/call.rs
@@ -14,7 +14,6 @@ impl CompilationHelper {
 
         for arg in &node.inner2 {
             let mut instr = MachineInstr::new(MachineMnemonic::Move);
-
             
             let arg_reg = args.get(reg_args);
 
diff --git a/src/CodeGen/compilation/ret.rs b/src/CodeGen/compilation/ret.rs
index e57a58ca..98cbe34f 100644
--- a/src/CodeGen/compilation/ret.rs
+++ b/src/CodeGen/compilation/ret.rs
@@ -6,9 +6,11 @@ impl CompilationHelper {
     #[allow(missing_docs)]
     pub fn compile_ret_ty(&mut self, node: &Return<Type>, mc_sink: &mut Vec<MachineInstr>, _: &Block) {
         let mut instr = MachineInstr::new(MachineMnemonic::Move);
-        
-        instr.add_operand(MachineOperand::Reg(self.call.return_reg(self.arch, node.inner1.into())) );
+
+        instr.set_out(MachineOperand::Reg(self.call.return_reg(self.arch, node.inner1.into())) );
         instr.add_operand(MachineOperand::Imm(node.inner1.val() as i64));
+
+        mc_sink.push( instr );
         
         mc_sink.push( MachineInstr::new(MachineMnemonic::Return) );
     }
diff --git a/tools/ytest/main.rs b/tools/ytest/main.rs
index af3d4689..d19d81b8 100644
--- a/tools/ytest/main.rs
+++ b/tools/ytest/main.rs
@@ -1,3 +1,4 @@
+use core::str;
 use std::{fs::File, io::{Read, Write}};
 use std::process::{exit, Command};
 
@@ -68,6 +69,8 @@ fn main() {
         },
     }
 
+    let mut found = String::new();
+
     for cmd in parsed.cmd.split("&&") {
         let args = cmd.replace("%s", path_str);
         let args = unescaper::unescape(&args).unwrap();
@@ -105,13 +108,17 @@ fn main() {
             cmd.arg( arg );
         }
 
-        //let out = cmd.output().expect("failed to execute the process");
-        //println!("{}", String::from_utf8(out.stdout).unwrap());
+        let out = cmd.output().expect("failed to execute the process");
+        found.push_str(str::from_utf8(&out.stdout).unwrap());
 
         match cmd.status() {
             Ok(status) => {
                 if !status.success() {
-                    println!("{}: the programm didn't exit sucessfull", "Error".red().bold());
+                    if let Some(code) = status.code() {
+                        println!("{}: the programm didn't exit sucessfull with code {}", "Error".red().bold(), code);
+                    } else {
+                        println!("{}: the programm didn't exit sucessfull", "Error".red().bold());
+                    }
                     exit(-1)
                 }
             },