On Jan 24, 2020, at 11:46 AM, Nelson H. F. Beebe <beebe@math.utah.edu> wrote:

That was fine for Fortran, which at the time had no concept of
recursion.  However, Urs Ammann implemented a compiler for Niklaus
Wirth's Pascal language on a CDC 6400 (or 6600) in Zurich, and he had
to simulate a stack.  See

   On Code Generation in a PASCAL Compiler
   Software --- Practice and Experience 7(3) 391--423 May/June 1977

I have read that article in the past, but don't have download access
from our academic library to get a copy to refresh my memory.