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Re: [PATCH] Fix PR36078, fallout from early loop unrolling
- From: Zdenek Dvorak <rakdver at kam dot mff dot cuni dot cz>
- To: Richard Guenther <rguenther at suse dot de>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Tue, 29 Apr 2008 14:33:14 +0200
- Subject: Re: [PATCH] Fix PR36078, fallout from early loop unrolling
- References: <Pine.LNX.4.64.0804291315220.4130@zhemvz.fhfr.qr>
Hi,
> This patch adds a missing SSA update after early complete loop unrolling.
> Appearantly this is only needed if unrolling doesn't operate on
> loop-closed SSA form, but it might also paper over a problem with not
> doing so.
why does this help? We already call update_ssa in
try_unroll_loop_completely.
Zdenek