https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107831
--- Comment #1 from Petr Skocik <pskocik at gmail dot com> --- Sidenote regarding the stack-allocating code for cases when the size is not known to be less than pagesize: the code generated for those cases is quite large. It could be replaced (at least under -Os) with a call to a special assembly function that'd pop the return address (assuming the target machine pushes return addresses to the stack), allocate adjust and allocate the stack size in a piecemeal fashion so as to not skip guard pages, the repush the return address and return to caller with the stacksize expanded.
