https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70094
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2016-03-07
Component|c++ |tree-optimization
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. This is quite hard for us as GIMPLE doesn't allow arbitrary
constant
literals as function arguments and at RTL we can't remove the stack local
anymore.
So to make this work on GIMPLE we'd need to allow
bar ( CONSTRUCTOR {1, 2, 3 } )
so maybe CONSTRUCTORs marked with TREE_CONSTANT. Of course expansion
needs to work as well for this.
The optimization pass to generate this would be SRA.
Cost issues if you have two calls like
bar (f);
bar (f);
etc.
