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Re: RFC (gimple): PATCH to really avoid copying empty classes (c++/43787)

From: Jason Merrill <jason at redhat dot com>
To: Richard Guenther <rguenther at suse dot de>
Cc: gcc-patches List <gcc-patches at gcc dot gnu dot org>, Jakub Jelinek <jakub at redhat dot com>, Aldy Hernandez <aldyh at redhat dot com>
Date: Wed, 05 May 2010 11:19:19 -0400
Subject: Re: RFC (gimple): PATCH to really avoid copying empty classes (c++/43787)
References: <4BE065DF.4070105@redhat.com> <alpine.LNX.2.00.1005051059110.1429@zhemvz.fhfr.qr>

On 05/05/2010 05:04 AM, Richard Guenther wrote:

I would like to move us to a point that the gimplifier only knowns about
GENERIC and the frontends would have finished at the point we do
gimplification.  Which is why I ask the question again why the C++
frontend cannot do the zero-sized type stuff during its genericization
phase?

Because the zero-size elimination needs to happen after gimplify_modify_expr_rhs. I suppose it would be possible for cp_genericize to call gimplify_modify_expr_rhs, though...

Jason

References:
- RFC (gimple): PATCH to really avoid copying empty classes (c++/43787)
  - From: Jason Merrill
- Re: RFC (gimple): PATCH to really avoid copying empty classes (c++/43787)
  - From: Richard Guenther

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