https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89544
--- Comment #2 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Dont know if it helps, but when I wrote my patch,
I remember the reason why parameter which have an address taken
is in use_register_for_decl
returns false here:
/* Honor addressability. */
if (TREE_ADDRESSABLE (decl))
return false;
if that happens the value is copied to a new stack slot,
if TREE_ADDRESSABLE is false things go wrong.
