-- d.p
-- d.q
-- d.r
- -- d.s
+ -- d.s Disable expansion of slice move, use memmove
-- d.t Disable static allocation of library level dispatch tables
-- d.u
-- d.v
-- main source (this corresponds to a previous behavior of -gnatl and
-- is used for running the ACATS tests).
+ -- d.s Normally the compiler expands slice moves into loops if overlap
+ -- might be possible. This debug flag inhibits that expansion, and
+ -- the back end is expected to use an appropriate routine to handle
+ -- overlap, based on Forward_OK and Backwards_OK flags.
+
-- d.t The compiler has been modified (a fairly extensive modification)
-- to generate static dispatch tables for library level tagged types.
-- This debug switch disables this modification and reverts to the
-- File.Storage := Contents;
-- end Write_All;
- -- We expand to a loop in either of these two cases.
+ -- We expand to a loop in either of these two cases
-- Question for future thought. Another potentially more efficient
-- approach would be to create the actual subtype, and then do an
-- gigi handle it.
if not Loop_Required then
+
+ -- Assume gigi can handle it if Forwards_OK is set
+
if Forwards_OK (N) then
return;
- else
- null;
- -- Here is where a memmove would be appropriate ???
+
+ -- If Forwards_OK is not set, the back end will need something
+ -- like memmove to handle the move. For now, this processing is
+ -- activated using the .s debug flag (-gnatd.s).
+
+ elsif Debug_Flag_Dot_S then
+ return;
end if;
end if;