+2007-04-27 Zdenek Dvorak <dvorakz@suse.cz>
+
+ * tree-cfgcleanup.c (cleanup_tree_cfg): Verify dominance info
+ if it claims to be available.
+ * tree-ssa-dce.c (remove_dead_stmt): Mark cfg as altered when
+ edge is redirected.
+ (perform_tree_ssa_dce): Always free postdominators.
+
2007-04-27 Richard Henderson <rth@redhat.com>
* config/alpha/predicates.md (aligned_memory_operand): Mark
3. If the post dominator has PHI nodes we may be able to compute
the right PHI args for them.
-
In each of these cases we must remove the control statement
as it may reference SSA_NAMEs which are going to be removed and
we remove all but one outgoing edge from the block. */
/* Redirect the first edge out of BB to reach POST_DOM_BB. */
redirect_edge_and_branch (EDGE_SUCC (bb, 0), post_dom_bb);
PENDING_STMT (EDGE_SUCC (bb, 0)) = NULL;
+
+ /* It is not sufficient to set cfg_altered below during edge
+ removal, in case BB has two successors and one of them
+ is POST_DOM_BB. */
+ cfg_altered = true;
}
EDGE_SUCC (bb, 0)->probability = REG_BR_PROB_BASE;
EDGE_SUCC (bb, 0)->count = bb->count;
}
}
}
+
return something_changed;
}
something_changed |= eliminate_unnecessary_stmts ();
something_changed |= cfg_altered;
- if (aggressive && something_changed)
- free_dominance_info (CDI_POST_DOMINATORS);
+ /* We do not update postdominators, so free them unconditionally. */
+ free_dominance_info (CDI_POST_DOMINATORS);
/* If we removed paths in the CFG, then we need to update
dominators as well. I haven't investigated the possibility