[Bug target/18896] addressing split complex parm

[rth at gcc dot gnu dot org]

------- Additional Comments From rth at gcc dot gnu dot org  2004-12-09 06:58 -------
I think the correct solution is to explicitly *clear* TREE_ADDRESSABLE in
split_complex_args and set DECL_ARTIFICIAL so that the two pieces get 
allocated to pseudo registers.  Then unsplit_complex needs to notice that
the original decl is TREE_ADDRESSABLE, allocate contiguous memory, and store
the two pseudos into it.

Something to work on for 4.1 might be noticing that the two members of the
concat live in adjacent parameter memory, and promote that parameter memory
to the address of the entire complex.  That wouldn't be particularly easy 
at the stage that unsplit_complex is currently called.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18896