Print numbers with multiple digits

TODO

@@ -1,8 +1,12 @@
 # Intermediate code generation
 
-- Calculate maximum number of arguments that a function can have. Put procedure
-  arguments onto the stack, above the stack pointer. Should the offsets be
-  calculated during IR generation or target code generation?
+- All procedure calls a generated with a single arguments. To support more
+  arguments they should be put onto the stack, above the stack pointer.
+  The stack can grow on demand and then be cleaned up (the call instruction
+  contains the number of arguments, so the stack size can be reduced), or the
+  function with most arguments can be found and the stack size allocated.
+  To access the arguments inside a procedure, the information about argument
+  names should be kept somewhere.
 
 # ELF generation
 
@@ -16,4 +20,4 @@
 
 # Built-in
 
-Printi should be able to print numbers with multiple digits.
+Printi should print a sign for negative numbers.