On Wed, Apr 29, 2009 at 11:34 PM, Tobias Grosser <gros...@fim.uni-passau.de> wrote: > Hi gcc developers, hi graphities > > here are some notes from our weekly phone call. Unfortunately I missed > to send out the notes from the last two phone calls, but I hope to get > them out more regulary. Believe in me! ;-) > > http://gcc.gnu.org/wiki/Graphite_Phone_Call/2009_04_29 > > Attendees: Li, Jan, Konrad, Sebastian, Tobias, David, Christophe > > * Reductions: Diego OK with going out of SSA.
You will loose all points-to information. I think going out of SSA is a very bad idea. Richard. > * Patch not yet ready. The higher code coverage exposes an > IVSTACK bug. > * IVStack: Sebastian is working on removing it > * Data dependence analysis: Committed to graphite branch. > * Not yet enabled, as the data reference still does not > bootstrap. The lexicographic smaller than constraint is > not yet added. This is not wrong but very conservative. > Dependence test should be enabled with > -fgraphite-identity. > * Loop transformations: We need some simple transformations to > check data dependency analysis. > * Pranav? We did not hear anything yet. > * Data reference: Last bugs have to be fixed. > * Not yet enabled. Blocks data dependence analysis. > * PCP: > * Jan Implemented simplification/canonicalization for > expressions. This will allow a systematic translation of > expressions to constraints. Jan will work on a reduced > polyhedral interface that is used in PCP. First PCP > integration in gcc - later extended by reductions. > > No good representation for reductions for the general > case. Like conditions and PHI nodes (Sebastian) Maybe > for a subset of the reductions we can add commutativaty > of operations. > > * Autopar: Li prepared some patches to trigger autopar by > graphite. > * Autopar failed in the graphite branch even without > graphite enabled. It seems we introduced a bug while > using some code of it for graphite. The breakage happens > in the reductions part. > * Merge from trunk: > * Sebastian wants to work on this Changes in vectorizer > Last merge 4 months ago Tried mid march but was > difficult. So stopped because of ENOTIME. > * Parts of graphite working well?: The polyhedral part of the > graphite architecture will be described > * in the Tobias' paper at the summit and the PCP part by > Jan. > * Worldwide interest: Cristianno Martins from Brazil showed some > interest > * http://gcc.gnu.org/ml/gcc/2009-04/msg00711.html > > * We already have people from the US, Europe and China > contributing. > > > >
