[Bug rtl-optimization/44194] struct returned by value generates useless stores

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44194

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |

--- Comment #22 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-06-15 21:09:18 UTC ---
> The DSE patch still leaves 2 redundant stores.

OK, I missed this, reopening...

> The following patch will enable DSE to remove those two stores. Does this
> look ok?

Calling into the gimplifier from the RTL expander doesn't look appropriate.

More fundamentally, it's a little unfortunate to spill to memory a value
returned in registers.  Can we try to use emit_group_move_into_temps here
instead (under the appropriate circumstances)?