http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53852
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> 2012-12-13
12:59:45 UTC ---
Sven suggests sth like:
Index: gcc/graphite-dependences.c
===================================================================
--- gcc/graphite-dependences.c (revision 194472)
+++ gcc/graphite-dependences.c (working copy)
@@ -461,13 +461,16 @@ compute_deps (scop_p scop, vec<poly_bb_p
isl_union_map *reads = scop_get_reads (scop, pbbs);
isl_union_map *must_writes = scop_get_must_writes (scop, pbbs);
isl_union_map *may_writes = scop_get_may_writes (scop, pbbs);
- isl_union_map *all_writes = isl_union_map_union
- (isl_union_map_copy (must_writes), isl_union_map_copy (may_writes));
- isl_space *space = isl_union_map_get_space (all_writes);
- isl_union_map *empty = isl_union_map_empty (space);
isl_union_map *original = scop_get_original_schedule (scop, pbbs);
int res;
+ reads = isl_union_map_coalesce (reads);
+ must_writes = isl_union_map_coalesce (must_writes);
+ may_writes = isl_union_map_coalesce (may_writes);
+ isl_union_map *all_writes = isl_union_map_union
+ (isl_union_map_copy (must_writes), isl_union_map_copy (may_writes));
+ all_writes = isl_union_map_coalesce (all_writes);
+ original = isl_union_map_coalesce (original);
res = isl_union_map_compute_flow (isl_union_map_copy (reads),
isl_union_map_copy (must_writes),
isl_union_map_copy (may_writes),
@@ -475,6 +478,8 @@ compute_deps (scop_p scop, vec<poly_bb_p
must_raw, may_raw, must_raw_no_source,
may_raw_no_source);
gcc_assert (res == 0);
+ isl_space *space = isl_union_map_get_space (all_writes);
+ isl_union_map *empty = isl_union_map_empty (space);
res = isl_union_map_compute_flow (isl_union_map_copy (all_writes),
reads, empty,
isl_union_map_copy (original),
which for me only shaves a small bit of compile-time from the reduced testcase
(around 10%).
