https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97708
--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> --- It is exactly the same as if you have some variable that must live in memory (e.g. address taken), if you use a constraint that allows memory, it will be put there without reloading, if it does not, then the value of the variable will be reloaded in whatever it is asked to be put into.
