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tree-cfgcleanup.c (cleanup_tree_cfg): Verify dominance info if it claims to be available. 

* 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.

From-SVN: r124236
This commit is contained in:
Zdenek Dvorak 2007-04-27 22:40:26 +02:00 committed by Zdenek Dvorak
parent e1535fe0c5
commit 30251f7a3a
3 changed files with 22 additions and 4 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
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

7
gcc/tree-cfgcleanup.c
View File

@ -615,7 +615,12 @@ cleanup_tree_cfg (void)
calculate_dominance_info (CDI_DOMINATORS);
}
else
changed = false;
{
#ifdef ENABLE_CHECKING
verify_dominators (CDI_DOMINATORS);
#endif
changed = false;
}
changed |= cleanup_tree_cfg_1 ();

11
gcc/tree-ssa-dce.c
View File

@ -607,7 +607,6 @@ remove_dead_stmt (block_stmt_iterator *i, basic_block bb)
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. */
@ -620,6 +619,11 @@ remove_dead_stmt (block_stmt_iterator *i, basic_block bb)
/* 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;
@ -718,6 +722,7 @@ eliminate_unnecessary_stmts (void)
}
}
}
return something_changed;
}
@ -837,8 +842,8 @@ perform_tree_ssa_dce (bool aggressive)
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