https://master--suspicious-stonebraker-7d2d21.netlify.app/tags/assembly/ Recent content in Assembly on Nikhil's blog Hugo -- gohugo.io en-US Mon, 25 Dec 2017 11:14:05 -0800 https://master--suspicious-stonebraker-7d2d21.netlify.app/post/2017/why-does-stack-extra-bytes-digging-clangs-return/ Mon, 25 Dec 2017 11:14:05 -0800 https://master--suspicious-stonebraker-7d2d21.netlify.app/post/2017/why-does-stack-extra-bytes-digging-clangs-return/ I was futzing around with some C code a few days ago and noticed that executables generated by Clang would sometimes have an extra 4 bytes on the stack. This was just for the main function. We can verify this is Compiler Explorer. Try switching to GCC and this doesn’t happen. This was interesting, so I spent a few hours over the holiday digging into why and how this happens. For the remainder of this post we will be using these 3 examples, which you can play with in Compiler Explorer.