This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Re: [PATCH] Fix PR23744, VRP not merging discontinuous ranges of PHIs
- From: Duncan Sands <baldrick at free dot fr>
- To: gcc-patches at gcc dot gnu dot org
- Cc: Diego Novillo <dnovillo at redhat dot com>, Richard Guenther <rguenther at suse dot de>
- Date: Tue, 16 May 2006 12:30:05 +0200
- Subject: Re: [PATCH] Fix PR23744, VRP not merging discontinuous ranges of PHIs
- References: <200605051110.04479.baldrick@free.fr> <4468A969.7090105@redhat.com>
On Monday 15 May 2006 18:16, Diego Novillo wrote:
> Duncan Sands wrote on 05/05/06 05:10:
>
> > PR tree-optimization/23744
> > * tree-vrp.c (vrp_meet): do not require ranges to intersect.
> >
> This will be more appropriate for the next stage 1. In the meantime, I
> would like to see compile time impact analysis on real code (I can help
> out with the usual suspects I have around: cc1-i-files, DLV, MICO, SPEC,
> etc).
>
> You are lengthening the simulation by slowing down the decay into
> VR_VARYING.
You are correct, this may be a problem. I will try to do some benchmarking,
but it may take a few days. In the meantime, Richard Guenther has kindly
agreed run the patch through his C++ tester.
All the best,
Duncan.