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Re: [graphite] Fix for pr38492 and pr38498
- From: Jan Sjodin <jan_sjodin at yahoo dot com>
- To: Sebastian Pop <sebpop at gmail dot com>, Jack Howarth <howarth at bromo dot med dot uc dot edu>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Wed, 7 Jan 2009 06:06:51 -0800 (PST)
- Subject: Re: [graphite] Fix for pr38492 and pr38498
- Reply-to: jan_sjodin at yahoo dot com
> Sebastian,
> Interestingly, if I add -floop-block to
> "-ffast-math -funroll-loops -msse3 -O3
> -fgraphite-identity",
> I find that the capacita benchmark fails again with the
> same NaN errors as before Jan's patch. Is it
> possible that Jan's patch needs to extended to handle
> -floop-block?
> Jack
Yes, blocking can introduce similar errors to the ones that were fixed. Wrong answers can be introduced by interchange and segmentation faults are more likely caused by strip-mining since the loop bounds are modified.
- Jan