Hi folks, hi graphities, here you are with the latest notes from our graphite phone call.
It is also available on the wiki: http://gcc.gnu.org/wiki/Graphite_Phone_Call/2009_05_06 All the best Tobi Attendees: Sebastian, Tobias, Christophe, Albert, Li, Jan, Razya, Konrad, Antoniu * Sebastian: * Working on IVstack removal, * Several other patches like "remove strcmp". (Will be committed as soon as possible) * in clast-to-gimple: * There is a problem finding the type of induction variables and upper bound expressions, as cloog does not carry information about them. * We will try "unsigned long long" and have to insert casts. (This might trigger problems in the vectorizer and might be slow. Maybe we can optimize the size of the iv later.) Before: Used we used the type of the old IV. But with strip mining there is no 1 to 1 relation in between ivs, so there is not always a type. Other idea: infer types from upper and lower bound expressions. But does not seem to work either. This blocks the work on removal IVSTACK. * Removal of IVStack: Blocked by types. But already triggers some bugs. * Reductions: Blocking by IVSTack. * Li: * Mark loops as parallel with -fgraphite-force-parallel (committed). * Trigger autopar with loop->can_be_parallel (committed). * Started testsuite for graphite_autopar (sent for review to gcc-patches). * * Autopar fails in graphite branch on this line; ------------------------------------------------------------------------ red = reduction_phi (reduction_list, reduc_phi); if (red == NULL) { if (dump_file && (dump_flags & TDF_DETAILS)) fprintf (dump_file, " FAILED: it is not a part of reduction.\n"); return false; } ------------------------------------------------------------------------ * Tobias: * Fix bugs to enable data reference building (Now only gfortran.dg/transpose_conjg_1.f90 fails). * Bootstrapped dependency testing. Worked except one test case (gfortran.dg/cray_pointers_2.f90). * Working on his paper about the polyhedral part of graphite to attract more research in this area. * * Jan: * Got gcc summit paper accepted. Will be about the design of Graphite: IR, components of the Graphite infrastructure, testsuite, example, internals, integration with external prototyping tools (POCC). We should have some discussions about who describes what in graphite, as Tobias also has a paper accepted. * Worked on the translation of PCP to Polyhedral representation.
