If I'm not mistaken, the reason of this bug is incorrect creation of a
poly_bb_p for basic_block from the existing pbb in new_pbb_from_pbb
(It is located in graphite-sese-to-poly.c). I think, that we should
set a new id of pbb1->domain (instead of using the id of the pbb),
which contains pointer to the pbb1.
I found out this after dumping of an index of pbb in the user
statement S_3. Its index is 9. It is created in
rewrite_reduction_out_of_ssa using new_pbb_from_pbb and the pbb with
index 3. After that the user statement S_3 is removed in
build_scop_drs, but the id of the pbb->domain and the
pbb->transformed point to the old pbb with index 3.
I've attached the patch, which may fix this.
--
Cheers, Roman Gareev.
Index: gcc/graphite-sese-to-poly.c
===================================================================
--- gcc/graphite-sese-to-poly.c (revision 212995)
+++ gcc/graphite-sese-to-poly.c (working copy)
@@ -2044,6 +2044,10 @@
break;
pbb1->domain = isl_set_copy (pbb->domain);
+ char name[50];
+ snprintf (name, sizeof (name), "S_%d", pbb_index (pbb1));
+ pbb1->domain = isl_set_set_tuple_id (pbb1->domain,
+ isl_id_alloc (scop->ctx, name, pbb1));
GBB_PBB (gbb1) = pbb1;
GBB_CONDITIONS (gbb1) = GBB_CONDITIONS (gbb).copy ();
