[Bug ipa/69241] [6 Regression] ICE: in assign_temp, at function.c:961

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69241

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c++                         |ipa

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
This is a problem with the gimple call generated in split_function.  It
considers functions that return by invisible reference and calls
gimple_call_set_return_slot_opt, but doesn't then set the LHS of the call, so
we end up allocating a temporary stack slot for it, which is wrong for a
TREE_ADDRESSABLE type.

It seems that the LHS doesn't get set because m_fn3 doesn't actually have a
return statement, but for some reason return_bb is different from the exit
block, so we don't get to the code later in split_function that creates a
return statement.

Changing component to IPA.