Re: [PATCH] Fix another case of noreturn call with TREE_ADDRESSABLE type on lhs (PR c++/71100)

[Jason Merrill <jason@redhat.com>]

OK.

Jason


On Wed, May 18, 2016 at 4:55 PM, Jakub Jelinek <jakub@redhat.com> wrote:
> Hi!
>
> In 6+ we require that lhs is present if the return type of a call is
> TREE_ADDRESSABLE, apparently this function has been missed.
>
> Fixed thusly, bootstrapped/regtested (at r236371, later trunk fails
> miserably on both x86_64-linux and i686-linux), ok for trunk/6.2?
>
> 2016-05-18  Jakub Jelinek  <jakub@redhat.com>
>
>         PR c++/71100
>         * cgraph.c (cgraph_edge::redirect_call_stmt_to_callee): Don't drop
>         lhs if it has TREE_ADDRESSABLE type.
>
>         * g++.dg/opt/pr71100.C: New test.
>
> --- gcc/cgraph.c.jj     2016-05-16 18:53:43.000000000 +0200
> +++ gcc/cgraph.c        2016-05-18 10:53:39.491189469 +0200
> @@ -1515,7 +1515,8 @@ cgraph_edge::redirect_call_stmt_to_calle
>    /* If the call becomes noreturn, remove the LHS if possible.  */
>    if (lhs
>        && (gimple_call_flags (new_stmt) & ECF_NORETURN)
> -      && TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (lhs))) == INTEGER_CST)
> +      && TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (lhs))) == INTEGER_CST
> +      && !TREE_ADDRESSABLE (TREE_TYPE (lhs)))
>      {
>        if (TREE_CODE (lhs) == SSA_NAME)
>         {
> --- gcc/testsuite/g++.dg/opt/pr71100.C.jj       2016-05-18 10:56:12.798070065 +0200
> +++ gcc/testsuite/g++.dg/opt/pr71100.C  2016-05-18 10:56:07.974136754 +0200
> @@ -0,0 +1,18 @@
> +// PR c++/71100
> +// { dg-do compile }
> +// { dg-options "-O2" }
> +
> +struct D { ~D (); };
> +struct E { D foo () { throw 1; } };
> +
> +inline void
> +bar (D (E::*f) (), E *o)
> +{
> +  (o->*f) ();
> +}
> +
> +void
> +baz (E *o)
> +{
> +  bar (&E::foo, o);
> +}
>
>         Jakub