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Subject: [Bug middle-end/96194] [10/11 Regression] ICE in assign_temp, at
 function.c:984 during RTL pass: expand
Date: Tue, 14 Jul 2020 14:03:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96194

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:b1d389d60d1929c7528ef984925ea010e3bf2c1a

commit r11-2086-gb1d389d60d1929c7528ef984925ea010e3bf2c1a
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Jul 14 16:01:11 2020 +0200

    expr: Unbreak build of mesa [PR96194]

    > > The store to the whole of each volatile object was picked apart
    > > like there had been an individual assignment to each of the
    > > fields.  Reads were added as part of that; see PR for details.
    > > The reads from volatile memory were a clear bug; individual
    > > stores questionable.  A separate patch clarifies the docs.

    This breaks building of mesa on both the trunk and 10 branch.

    The problem is that the middle-end may never create temporaries of non-=
POD
    (TREE_ADDRESSABLE) types, those can be only created when the language s=
ays
    so and thus only the FE is allowed to create those.

    This patch just reverts the behavior to what we used to do before for t=
he
    stores to volatile non-PODs.  Perhaps we want to do something else, but
    definitely we can't create temporaries of the non-POD type.  It is up to
    discussions on what should happen in those cases.

    2020-07-14  Jakub Jelinek  <jakub@redhat.com>

            PR middle-end/96194
            * expr.c (expand_constructor): Don't create temporary for store=
 to
            volatile MEM if exp has an addressable type.

            * g++.dg/opt/pr96194.C: New test.=