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Re: [Bug tree-optimization/35805] [ira] error in start_allocno_priorities, at ira-color.c:1806
- From: "Steven Bosscher" <stevenb dot gcc at gmail dot com>
- To: "Paolo Bonzini" <bonzini at gnu dot org>
- Cc: "Kenneth Zadeck" <zadeck at naturalbridge dot com>, gcc-bugzilla at gcc dot gnu dot org, "Park, Seongbae" <seongbae dot park at gmail dot com>, "Vladimir Makarov" <vmakarov at redhat dot com>, gcc-patches <gcc-patches at gcc dot gnu dot org>, Kenneth dot Zadeck at naturalbridge dot com
- Date: Fri, 2 Jan 2009 19:44:58 +0100
- Subject: Re: [Bug tree-optimization/35805] [ira] error in start_allocno_priorities, at ira-color.c:1806
- References: <bug-35805-14137@http.gcc.gnu.org/bugzilla/> <20090102152049.24429.qmail@sourceware.org> <495E33D5.8000208@naturalbridge.com> <495E41A5.7020502@gnu.org> <495E5B03.7080100@naturalbridge.com> <495E5EF1.3050104@gnu.org>
On Fri, Jan 2, 2009 at 7:37 PM, Paolo Bonzini <bonzini@gnu.org> wrote:
>>> At this point, if your patch costs say 0.3%, and removing all traces
>>> DF_LR_RUN_DCE (instead scheduling a dozen more pass_fast_rtl_dce in
>>> passes.c) costs 0.5%, I'd rather see the latter, at least it's easier to
>>> look for opportunities to remove some useless DCE.
>
> I'll try to do this for 4.5.
It might be more worthwhile to just "fix" IRA to use DF_LIVE (which
Vlad should have done in the first place). Then we wouldn't need
Kenny's patch and DF_LR_RUN_DCE would still be essentially free.
Gr.
Steven