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[Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
- From: "sebpop at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 21 Mar 2010 16:28:12 -0000
- Subject: [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
- References: <bug-42181-11113@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #26 from sebpop at gmail dot com 2010-03-21 16:28 -------
Subject: Re: [4.5 Regression][graphite]
-fgraphite-identity miscompiles air.f90
On Sat, Mar 20, 2010 at 05:45, dominiq at lps dot ens dot fr wrote:
> Do you understand why graphite does not detect that the loop for [scat_1+1,
> T_10-2] depends on the one for ?[0, scat_1-1]?
Graphite does know this, but it does not ask CLooG to generate
[0, scat_1-1] after [scat_1+1, T_10-2], however CLooG does
generate it, so I am thinking that this is a problem in CLooG.
> Second question why does graphite exchange the order of the split loops?
>
CLooG does that.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181