This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: rfc: don't delete alternate entry points in cfgcleanup.c

From: Zack Weinberg <zack at codesourcery dot com>
To: Richard Henderson <rth at redhat dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Mon, 27 Jan 2003 23:38:28 -0800
Subject: Re: rfc: don't delete alternate entry points in cfgcleanup.c
References: <871y2y81cu.fsf@egil.codesourcery.com><20030128073459.GF19109@redhat.com>

Richard Henderson <rth@redhat.com> writes:

> On Mon, Jan 27, 2003 at 06:17:05PM -0800, Zack Weinberg wrote:
>> We discovered while trying to do stuff with alternate entry points
>> that cfgcleanup.c is prone to delete the special CODE_LABELs.
>
> The correct way to handle this is to have an edge from
> ENTRY_BLOCK to these alternate entry points.  Using 
> LABEL_PRESERVE_P is incorrect.

Such edges are being created by cfgbuild.c (make_edges) but this does
not appear to do the trick.  I think try_optimize_cfg is running too
early.

zw

Follow-Ups:
- Re: rfc: don't delete alternate entry points in cfgcleanup.c
  - From: Richard Henderson

References:
- rfc: don't delete alternate entry points in cfgcleanup.c
  - From: Zack Weinberg
- Re: rfc: don't delete alternate entry points in cfgcleanup.c
  - From: Richard Henderson

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]