------- Comment #37 from steven at gcc dot gnu dot org 2006-02-05 22:47 -------
At least I get VRP time down to nothing with a patchlet like this one:
Index: tree-vrp.c
===================================================================
--- tree-vrp.c (revision 110617)
+++ tree-vrp.c (working copy)
@@ -326,7 +326,7 @@ add_equivalence (bitmap equiv, tree var)
value_range_t *vr = vr_value[ver];
bitmap_set_bit (equiv, ver);
- if (vr && vr->equiv)
+ if (vr && vr->equiv && bitmap_count_bits (vr->equiv) < 20)
bitmap_ior_into (equiv, vr->equiv);
}
For a proper patch, the number should of course be a PARAM and I think using
bitmap_count_bits penalizes the common case too much (walking the whole bitmap
is cache expensive even for small bitmaps).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19097
