You already got answers for SEH. For Steensgard, see the paper at https://www.cs.utexas.edu/users/pingali/CS380C/2007fa/papers/steensgard.pdf https://www.cs.ute

You already got answers for SEH. For Steensgard, see the paper at https://www.cs.utexas.edu/users/pingali/CS380C/2007fa/papers/steensgard.pdf https://www.cs.utexas.edu/users/pingali/CS380C/2007fa/papers... (no idea about the patent itself, but the paper is probably easier to read).