Try compiling with optimizations. I think by default this site doesn't add optimization flags. Here what happens with optimizations: https://godbolt.org/z/G18z

Try compiling with optimizations. I think by default this site doesn't add optimization flags. Here what happens with optimizations: https://godbolt.org/z/G18zd7chP https://godbolt.org/z/G18zd7chP Look at the registers usages vs stack